From ed427af748244d06edeaa3b4079ede752b8ae929 Mon Sep 17 00:00:00 2001
From: Adrian Roos <roosa@google.com>
Date: Thu, 11 Jun 2015 15:38:34 -0700
Subject: [PATCH] Ensure text is visible when choosing pattern

Bug: 21639578
Change-Id: Ib948411b3087c752a36ed6f853915e59946c0988
---
 res/layout/choose_lock_pattern.xml            |   12 +-
 .../MatchParentShrinkingLinearLayout.java     | 1586 +++++++++++++++++
 2 files changed, 1592 insertions(+), 6 deletions(-)
 create mode 100644 src/com/android/settings/widget/MatchParentShrinkingLinearLayout.java

diff --git a/res/layout/choose_lock_pattern.xml b/res/layout/choose_lock_pattern.xml
index 50f05d8310b..94eecef0301 100644
--- a/res/layout/choose_lock_pattern.xml
+++ b/res/layout/choose_lock_pattern.xml
@@ -21,7 +21,7 @@
     android:layout_height="match_parent">
 
     <!-- takes up all space above button bar at bottom -->
-    <LinearLayout
+    <com.android.settings.widget.MatchParentShrinkingLinearLayout
         android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="0dip"
@@ -29,10 +29,11 @@
 
         <TextView android:id="@+id/headerText"
             android:layout_width="match_parent"
-            android:layout_height="0dip"
+            android:layout_height="wrap_content"
             android:layout_weight="1"
+            android:minLines="2"
             android:gravity="center"
-            android:textSize="18sp"/>
+            android:textSize="18sp" />
 
         <View
              android:background="@*android:drawable/code_lock_top"
@@ -41,8 +42,7 @@
 
         <com.android.internal.widget.LockPatternView android:id="@+id/lockPattern"
              android:layout_width="match_parent"
-             android:layout_height="match_parent"
-             android:background="@color/lock_pattern_background" />
+             android:layout_height="match_parent" />
 
         <!-- bottom line looks bad when button bar is their too, omit in this case -->
         <!--View
@@ -57,7 +57,7 @@
             android:gravity="center"
             android:textSize="14sp"/>
 
-    </LinearLayout>
+    </com.android.settings.widget.MatchParentShrinkingLinearLayout>
 
     <LinearLayout
         style="@style/SecurityPreferenceButtonContainer"
diff --git a/src/com/android/settings/widget/MatchParentShrinkingLinearLayout.java b/src/com/android/settings/widget/MatchParentShrinkingLinearLayout.java
new file mode 100644
index 00000000000..79971e50044
--- /dev/null
+++ b/src/com/android/settings/widget/MatchParentShrinkingLinearLayout.java
@@ -0,0 +1,1586 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settings.widget;
+
+import com.android.internal.R;
+
+import android.annotation.IntDef;
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.drawable.Drawable;
+import android.util.AttributeSet;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewDebug;
+import android.view.ViewGroup;
+import android.view.ViewHierarchyEncoder;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+
+/**
+ * A LinearLayout with a twist: if the contents don't fit, it takes space away from the
+ * MATCH_PARENT children, instead of taking it from the weighted ones.
+ *
+ * TODO: Remove once we redesign the ChooseLockPattern screen with a sane layout.
+ */
+public class MatchParentShrinkingLinearLayout extends ViewGroup {
+    /** @hide */
+    @IntDef({HORIZONTAL, VERTICAL})
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface OrientationMode {}
+
+    public static final int HORIZONTAL = 0;
+    public static final int VERTICAL = 1;
+
+    /** @hide */
+    @IntDef(flag = true,
+            value = {
+                SHOW_DIVIDER_NONE,
+                SHOW_DIVIDER_BEGINNING,
+                SHOW_DIVIDER_MIDDLE,
+                SHOW_DIVIDER_END
+            })
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface DividerMode {}
+
+    /**
+     * Don't show any dividers.
+     */
+    public static final int SHOW_DIVIDER_NONE = 0;
+    /**
+     * Show a divider at the beginning of the group.
+     */
+    public static final int SHOW_DIVIDER_BEGINNING = 1;
+    /**
+     * Show dividers between each item in the group.
+     */
+    public static final int SHOW_DIVIDER_MIDDLE = 2;
+    /**
+     * Show a divider at the end of the group.
+     */
+    public static final int SHOW_DIVIDER_END = 4;
+
+    /**
+     * Whether the children of this layout are baseline aligned.  Only applicable
+     * if {@link #mOrientation} is horizontal.
+     */
+    @ViewDebug.ExportedProperty(category = "layout")
+    private boolean mBaselineAligned = true;
+
+    /**
+     * If this layout is part of another layout that is baseline aligned,
+     * use the child at this index as the baseline.
+     *
+     * Note: this is orthogonal to {@link #mBaselineAligned}, which is concerned
+     * with whether the children of this layout are baseline aligned.
+     */
+    @ViewDebug.ExportedProperty(category = "layout")
+    private int mBaselineAlignedChildIndex = -1;
+
+    /**
+     * The additional offset to the child's baseline.
+     * We'll calculate the baseline of this layout as we measure vertically; for
+     * horizontal linear layouts, the offset of 0 is appropriate.
+     */
+    @ViewDebug.ExportedProperty(category = "measurement")
+    private int mBaselineChildTop = 0;
+
+    @ViewDebug.ExportedProperty(category = "measurement")
+    private int mOrientation;
+
+    @ViewDebug.ExportedProperty(category = "measurement", flagMapping = {
+            @ViewDebug.FlagToString(mask = -1,
+                equals = -1, name = "NONE"),
+            @ViewDebug.FlagToString(mask = Gravity.NO_GRAVITY,
+                equals = Gravity.NO_GRAVITY,name = "NONE"),
+            @ViewDebug.FlagToString(mask = Gravity.TOP,
+                equals = Gravity.TOP, name = "TOP"),
+            @ViewDebug.FlagToString(mask = Gravity.BOTTOM,
+                equals = Gravity.BOTTOM, name = "BOTTOM"),
+            @ViewDebug.FlagToString(mask = Gravity.LEFT,
+                equals = Gravity.LEFT, name = "LEFT"),
+            @ViewDebug.FlagToString(mask = Gravity.RIGHT,
+                equals = Gravity.RIGHT, name = "RIGHT"),
+            @ViewDebug.FlagToString(mask = Gravity.START,
+                equals = Gravity.START, name = "START"),
+            @ViewDebug.FlagToString(mask = Gravity.END,
+                equals = Gravity.END, name = "END"),
+            @ViewDebug.FlagToString(mask = Gravity.CENTER_VERTICAL,
+                equals = Gravity.CENTER_VERTICAL, name = "CENTER_VERTICAL"),
+            @ViewDebug.FlagToString(mask = Gravity.FILL_VERTICAL,
+                equals = Gravity.FILL_VERTICAL, name = "FILL_VERTICAL"),
+            @ViewDebug.FlagToString(mask = Gravity.CENTER_HORIZONTAL,
+                equals = Gravity.CENTER_HORIZONTAL, name = "CENTER_HORIZONTAL"),
+            @ViewDebug.FlagToString(mask = Gravity.FILL_HORIZONTAL,
+                equals = Gravity.FILL_HORIZONTAL, name = "FILL_HORIZONTAL"),
+            @ViewDebug.FlagToString(mask = Gravity.CENTER,
+                equals = Gravity.CENTER, name = "CENTER"),
+            @ViewDebug.FlagToString(mask = Gravity.FILL,
+                equals = Gravity.FILL, name = "FILL"),
+            @ViewDebug.FlagToString(mask = Gravity.RELATIVE_LAYOUT_DIRECTION,
+                equals = Gravity.RELATIVE_LAYOUT_DIRECTION, name = "RELATIVE")
+        }, formatToHexString = true)
+    private int mGravity = Gravity.START | Gravity.TOP;
+
+    @ViewDebug.ExportedProperty(category = "measurement")
+    private int mTotalLength;
+
+    @ViewDebug.ExportedProperty(category = "layout")
+    private float mWeightSum;
+
+    @ViewDebug.ExportedProperty(category = "layout")
+    private boolean mUseLargestChild;
+
+    private int[] mMaxAscent;
+    private int[] mMaxDescent;
+
+    private static final int VERTICAL_GRAVITY_COUNT = 4;
+
+    private static final int INDEX_CENTER_VERTICAL = 0;
+    private static final int INDEX_TOP = 1;
+    private static final int INDEX_BOTTOM = 2;
+    private static final int INDEX_FILL = 3;
+
+    private Drawable mDivider;
+    private int mDividerWidth;
+    private int mDividerHeight;
+    private int mShowDividers;
+    private int mDividerPadding;
+
+    private int mLayoutDirection = View.LAYOUT_DIRECTION_UNDEFINED;
+
+    public MatchParentShrinkingLinearLayout(Context context) {
+        this(context, null);
+    }
+
+    public MatchParentShrinkingLinearLayout(Context context, @Nullable AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public MatchParentShrinkingLinearLayout(Context context, @Nullable AttributeSet attrs,
+            int defStyleAttr) {
+        this(context, attrs, defStyleAttr, 0);
+    }
+
+    public MatchParentShrinkingLinearLayout(Context context, AttributeSet attrs, int defStyleAttr,
+            int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+
+        final TypedArray a = context.obtainStyledAttributes(
+                attrs, com.android.internal.R.styleable.LinearLayout, defStyleAttr, defStyleRes);
+
+        int index = a.getInt(com.android.internal.R.styleable.LinearLayout_orientation, -1);
+        if (index >= 0) {
+            setOrientation(index);
+        }
+
+        index = a.getInt(com.android.internal.R.styleable.LinearLayout_gravity, -1);
+        if (index >= 0) {
+            setGravity(index);
+        }
+
+        boolean baselineAligned = a.getBoolean(R.styleable.LinearLayout_baselineAligned, true);
+        if (!baselineAligned) {
+            setBaselineAligned(baselineAligned);
+        }
+
+        mWeightSum = a.getFloat(R.styleable.LinearLayout_weightSum, -1.0f);
+
+        mBaselineAlignedChildIndex = a.getInt(
+                com.android.internal.R.styleable.LinearLayout_baselineAlignedChildIndex, -1);
+
+        mUseLargestChild = a.getBoolean(R.styleable.LinearLayout_measureWithLargestChild, false);
+
+        setDividerDrawable(a.getDrawable(R.styleable.LinearLayout_divider));
+        mShowDividers = a.getInt(R.styleable.LinearLayout_showDividers, SHOW_DIVIDER_NONE);
+        mDividerPadding = a.getDimensionPixelSize(R.styleable.LinearLayout_dividerPadding, 0);
+
+        a.recycle();
+    }
+
+    /**
+     * Set how dividers should be shown between items in this layout
+     *
+     * @param showDividers One or more of {@link #SHOW_DIVIDER_BEGINNING},
+     *                     {@link #SHOW_DIVIDER_MIDDLE}, or {@link #SHOW_DIVIDER_END},
+     *                     or {@link #SHOW_DIVIDER_NONE} to show no dividers.
+     */
+    public void setShowDividers(@DividerMode int showDividers) {
+        if (showDividers != mShowDividers) {
+            requestLayout();
+        }
+        mShowDividers = showDividers;
+    }
+
+    @Override
+    public boolean shouldDelayChildPressedState() {
+        return false;
+    }
+
+    /**
+     * @return A flag set indicating how dividers should be shown around items.
+     * @see #setShowDividers(int)
+     */
+    @DividerMode
+    public int getShowDividers() {
+        return mShowDividers;
+    }
+
+    /**
+     * @return the divider Drawable that will divide each item.
+     *
+     * @see #setDividerDrawable(android.graphics.drawable.Drawable)
+     *
+     * @attr ref android.R.styleable#LinearLayout_divider
+     */
+    public Drawable getDividerDrawable() {
+        return mDivider;
+    }
+
+    /**
+     * Set a drawable to be used as a divider between items.
+     *
+     * @param divider Drawable that will divide each item.
+     *
+     * @see #setShowDividers(int)
+     *
+     * @attr ref android.R.styleable#LinearLayout_divider
+     */
+    public void setDividerDrawable(Drawable divider) {
+        if (divider == mDivider) {
+            return;
+        }
+        mDivider = divider;
+        if (divider != null) {
+            mDividerWidth = divider.getIntrinsicWidth();
+            mDividerHeight = divider.getIntrinsicHeight();
+        } else {
+            mDividerWidth = 0;
+            mDividerHeight = 0;
+        }
+        setWillNotDraw(divider == null);
+        requestLayout();
+    }
+
+    /**
+     * Set padding displayed on both ends of dividers.
+     *
+     * @param padding Padding value in pixels that will be applied to each end
+     *
+     * @see #setShowDividers(int)
+     * @see #setDividerDrawable(android.graphics.drawable.Drawable)
+     * @see #getDividerPadding()
+     */
+    public void setDividerPadding(int padding) {
+        mDividerPadding = padding;
+    }
+
+    /**
+     * Get the padding size used to inset dividers in pixels
+     *
+     * @see #setShowDividers(int)
+     * @see #setDividerDrawable(android.graphics.drawable.Drawable)
+     * @see #setDividerPadding(int)
+     */
+    public int getDividerPadding() {
+        return mDividerPadding;
+    }
+
+    /**
+     * Get the width of the current divider drawable.
+     *
+     * @hide Used internally by framework.
+     */
+    public int getDividerWidth() {
+        return mDividerWidth;
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        if (mDivider == null) {
+            return;
+        }
+
+        if (mOrientation == VERTICAL) {
+            drawDividersVertical(canvas);
+        } else {
+            drawDividersHorizontal(canvas);
+        }
+    }
+
+    void drawDividersVertical(Canvas canvas) {
+        final int count = getVirtualChildCount();
+        for (int i = 0; i < count; i++) {
+            final View child = getVirtualChildAt(i);
+
+            if (child != null && child.getVisibility() != GONE) {
+                if (hasDividerBeforeChildAt(i)) {
+                    final LayoutParams lp = (LayoutParams) child.getLayoutParams();
+                    final int top = child.getTop() - lp.topMargin - mDividerHeight;
+                    drawHorizontalDivider(canvas, top);
+                }
+            }
+        }
+
+        if (hasDividerBeforeChildAt(count)) {
+            final View child = getVirtualChildAt(count - 1);
+            int bottom = 0;
+            if (child == null) {
+                bottom = getHeight() - getPaddingBottom() - mDividerHeight;
+            } else {
+                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
+                bottom = child.getBottom() + lp.bottomMargin;
+            }
+            drawHorizontalDivider(canvas, bottom);
+        }
+    }
+
+    void drawDividersHorizontal(Canvas canvas) {
+        final int count = getVirtualChildCount();
+        final boolean isLayoutRtl = isLayoutRtl();
+        for (int i = 0; i < count; i++) {
+            final View child = getVirtualChildAt(i);
+
+            if (child != null && child.getVisibility() != GONE) {
+                if (hasDividerBeforeChildAt(i)) {
+                    final LayoutParams lp = (LayoutParams) child.getLayoutParams();
+                    final int position;
+                    if (isLayoutRtl) {
+                        position = child.getRight() + lp.rightMargin;
+                    } else {
+                        position = child.getLeft() - lp.leftMargin - mDividerWidth;
+                    }
+                    drawVerticalDivider(canvas, position);
+                }
+            }
+        }
+
+        if (hasDividerBeforeChildAt(count)) {
+            final View child = getVirtualChildAt(count - 1);
+            int position;
+            if (child == null) {
+                if (isLayoutRtl) {
+                    position = getPaddingLeft();
+                } else {
+                    position = getWidth() - getPaddingRight() - mDividerWidth;
+                }
+            } else {
+                final LayoutParams lp = (LayoutParams) child.getLayoutParams();
+                if (isLayoutRtl) {
+                    position = child.getLeft() - lp.leftMargin - mDividerWidth;
+                } else {
+                    position = child.getRight() + lp.rightMargin;
+                }
+            }
+            drawVerticalDivider(canvas, position);
+        }
+    }
+
+    void drawHorizontalDivider(Canvas canvas, int top) {
+        mDivider.setBounds(getPaddingLeft() + mDividerPadding, top,
+                getWidth() - getPaddingRight() - mDividerPadding, top + mDividerHeight);
+        mDivider.draw(canvas);
+    }
+
+    void drawVerticalDivider(Canvas canvas, int left) {
+        mDivider.setBounds(left, getPaddingTop() + mDividerPadding,
+                left + mDividerWidth, getHeight() - getPaddingBottom() - mDividerPadding);
+        mDivider.draw(canvas);
+    }
+
+    /**
+     * <p>Indicates whether widgets contained within this layout are aligned
+     * on their baseline or not.</p>
+     *
+     * @return true when widgets are baseline-aligned, false otherwise
+     */
+    public boolean isBaselineAligned() {
+        return mBaselineAligned;
+    }
+
+    /**
+     * <p>Defines whether widgets contained in this layout are
+     * baseline-aligned or not.</p>
+     *
+     * @param baselineAligned true to align widgets on their baseline,
+     *         false otherwise
+     *
+     * @attr ref android.R.styleable#LinearLayout_baselineAligned
+     */
+    @android.view.RemotableViewMethod
+    public void setBaselineAligned(boolean baselineAligned) {
+        mBaselineAligned = baselineAligned;
+    }
+
+    /**
+     * When true, all children with a weight will be considered having
+     * the minimum size of the largest child. If false, all children are
+     * measured normally.
+     *
+     * @return True to measure children with a weight using the minimum
+     *         size of the largest child, false otherwise.
+     *
+     * @attr ref android.R.styleable#LinearLayout_measureWithLargestChild
+     */
+    public boolean isMeasureWithLargestChildEnabled() {
+        return mUseLargestChild;
+    }
+
+    /**
+     * When set to true, all children with a weight will be considered having
+     * the minimum size of the largest child. If false, all children are
+     * measured normally.
+     *
+     * Disabled by default.
+     *
+     * @param enabled True to measure children with a weight using the
+     *        minimum size of the largest child, false otherwise.
+     *
+     * @attr ref android.R.styleable#LinearLayout_measureWithLargestChild
+     */
+    @android.view.RemotableViewMethod
+    public void setMeasureWithLargestChildEnabled(boolean enabled) {
+        mUseLargestChild = enabled;
+    }
+
+    @Override
+    public int getBaseline() {
+        if (mBaselineAlignedChildIndex < 0) {
+            return super.getBaseline();
+        }
+
+        if (getChildCount() <= mBaselineAlignedChildIndex) {
+            throw new RuntimeException("mBaselineAlignedChildIndex of LinearLayout "
+                    + "set to an index that is out of bounds.");
+        }
+
+        final View child = getChildAt(mBaselineAlignedChildIndex);
+        final int childBaseline = child.getBaseline();
+
+        if (childBaseline == -1) {
+            if (mBaselineAlignedChildIndex == 0) {
+                // this is just the default case, safe to return -1
+                return -1;
+            }
+            // the user picked an index that points to something that doesn't
+            // know how to calculate its baseline.
+            throw new RuntimeException("mBaselineAlignedChildIndex of LinearLayout "
+                    + "points to a View that doesn't know how to get its baseline.");
+        }
+
+        // TODO: This should try to take into account the virtual offsets
+        // (See getNextLocationOffset and getLocationOffset)
+        // We should add to childTop:
+        // sum([getNextLocationOffset(getChildAt(i)) / i < mBaselineAlignedChildIndex])
+        // and also add:
+        // getLocationOffset(child)
+        int childTop = mBaselineChildTop;
+
+        if (mOrientation == VERTICAL) {
+            final int majorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
+            if (majorGravity != Gravity.TOP) {
+               switch (majorGravity) {
+                   case Gravity.BOTTOM:
+                       childTop = mBottom - mTop - mPaddingBottom - mTotalLength;
+                       break;
+
+                   case Gravity.CENTER_VERTICAL:
+                       childTop += ((mBottom - mTop - mPaddingTop - mPaddingBottom) -
+                               mTotalLength) / 2;
+                       break;
+               }
+            }
+        }
+
+        LayoutParams lp = (LayoutParams) child.getLayoutParams();
+        return childTop + lp.topMargin + childBaseline;
+    }
+
+    /**
+     * @return The index of the child that will be used if this layout is
+     *   part of a larger layout that is baseline aligned, or -1 if none has
+     *   been set.
+     */
+    public int getBaselineAlignedChildIndex() {
+        return mBaselineAlignedChildIndex;
+    }
+
+    /**
+     * @param i The index of the child that will be used if this layout is
+     *          part of a larger layout that is baseline aligned.
+     *
+     * @attr ref android.R.styleable#LinearLayout_baselineAlignedChildIndex
+     */
+    @android.view.RemotableViewMethod
+    public void setBaselineAlignedChildIndex(int i) {
+        if ((i < 0) || (i >= getChildCount())) {
+            throw new IllegalArgumentException("base aligned child index out "
+                    + "of range (0, " + getChildCount() + ")");
+        }
+        mBaselineAlignedChildIndex = i;
+    }
+
+    /**
+     * <p>Returns the view at the specified index. This method can be overriden
+     * to take into account virtual children. Refer to
+     * {@link android.widget.TableLayout} and {@link android.widget.TableRow}
+     * for an example.</p>
+     *
+     * @param index the child's index
+     * @return the child at the specified index
+     */
+    View getVirtualChildAt(int index) {
+        return getChildAt(index);
+    }
+
+    /**
+     * <p>Returns the virtual number of children. This number might be different
+     * than the actual number of children if the layout can hold virtual
+     * children. Refer to
+     * {@link android.widget.TableLayout} and {@link android.widget.TableRow}
+     * for an example.</p>
+     *
+     * @return the virtual number of children
+     */
+    int getVirtualChildCount() {
+        return getChildCount();
+    }
+
+    /**
+     * Returns the desired weights sum.
+     *
+     * @return A number greater than 0.0f if the weight sum is defined, or
+     *         a number lower than or equals to 0.0f if not weight sum is
+     *         to be used.
+     */
+    public float getWeightSum() {
+        return mWeightSum;
+    }
+
+    /**
+     * Defines the desired weights sum. If unspecified the weights sum is computed
+     * at layout time by adding the layout_weight of each child.
+     *
+     * This can be used for instance to give a single child 50% of the total
+     * available space by giving it a layout_weight of 0.5 and setting the
+     * weightSum to 1.0.
+     *
+     * @param weightSum a number greater than 0.0f, or a number lower than or equals
+     *        to 0.0f if the weight sum should be computed from the children's
+     *        layout_weight
+     */
+    @android.view.RemotableViewMethod
+    public void setWeightSum(float weightSum) {
+        mWeightSum = Math.max(0.0f, weightSum);
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        if (mOrientation == VERTICAL) {
+            measureVertical(widthMeasureSpec, heightMeasureSpec);
+        } else {
+            measureHorizontal(widthMeasureSpec, heightMeasureSpec);
+        }
+    }
+
+    /**
+     * Determines where to position dividers between children.
+     *
+     * @param childIndex Index of child to check for preceding divider
+     * @return true if there should be a divider before the child at childIndex
+     * @hide Pending API consideration. Currently only used internally by the system.
+     */
+    protected boolean hasDividerBeforeChildAt(int childIndex) {
+        if (childIndex == 0) {
+            return (mShowDividers & SHOW_DIVIDER_BEGINNING) != 0;
+        } else if (childIndex == getChildCount()) {
+            return (mShowDividers & SHOW_DIVIDER_END) != 0;
+        } else if ((mShowDividers & SHOW_DIVIDER_MIDDLE) != 0) {
+            boolean hasVisibleViewBefore = false;
+            for (int i = childIndex - 1; i >= 0; i--) {
+                if (getChildAt(i).getVisibility() != GONE) {
+                    hasVisibleViewBefore = true;
+                    break;
+                }
+            }
+            return hasVisibleViewBefore;
+        }
+        return false;
+    }
+
+    /**
+     * Measures the children when the orientation of this LinearLayout is set
+     * to {@link #VERTICAL}.
+     *
+     * @param widthMeasureSpec Horizontal space requirements as imposed by the parent.
+     * @param heightMeasureSpec Vertical space requirements as imposed by the parent.
+     *
+     * @see #getOrientation()
+     * @see #setOrientation(int)
+     * @see #onMeasure(int, int)
+     */
+    void measureVertical(int widthMeasureSpec, int heightMeasureSpec) {
+        mTotalLength = 0;
+        int maxWidth = 0;
+        int childState = 0;
+        int alternativeMaxWidth = 0;
+        int weightedMaxWidth = 0;
+        boolean allFillParent = true;
+        float totalWeight = 0;
+
+        final int count = getVirtualChildCount();
+
+        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
+        final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
+
+        boolean matchWidth = false;
+        boolean skippedMeasure = false;
+
+        final int baselineChildIndex = mBaselineAlignedChildIndex;
+        final boolean useLargestChild = mUseLargestChild;
+
+        int largestChildHeight = Integer.MIN_VALUE;
+
+        // See how tall everyone is. Also remember max width.
+        for (int i = 0; i < count; ++i) {
+            final View child = getVirtualChildAt(i);
+
+            if (child == null) {
+                mTotalLength += measureNullChild(i);
+                continue;
+            }
+
+            if (child.getVisibility() == View.GONE) {
+               i += getChildrenSkipCount(child, i);
+               continue;
+            }
+
+            if (hasDividerBeforeChildAt(i)) {
+                mTotalLength += mDividerHeight;
+            }
+
+            LayoutParams lp = (LayoutParams) child.getLayoutParams();
+
+            totalWeight += lp.weight;
+
+            if (heightMode == MeasureSpec.EXACTLY && lp.height == 0 && lp.weight > 0) {
+                // Optimization: don't bother measuring children who are going to use
+                // leftover space. These views will get measured again down below if
+                // there is any leftover space.
+                final int totalLength = mTotalLength;
+                mTotalLength = Math.max(totalLength, totalLength + lp.topMargin + lp.bottomMargin);
+                skippedMeasure = true;
+            } else {
+                int oldHeight = Integer.MIN_VALUE;
+
+                if (lp.height == 0 && lp.weight > 0) {
+                    // heightMode is either UNSPECIFIED or AT_MOST, and this
+                    // child wanted to stretch to fill available space.
+                    // Translate that to WRAP_CONTENT so that it does not end up
+                    // with a height of 0
+                    oldHeight = 0;
+                    lp.height = LayoutParams.WRAP_CONTENT;
+                }
+
+                // Determine how big this child would like to be. If this or
+                // previous children have given a weight, then we allow it to
+                // use all available space (and we will shrink things later
+                // if needed).
+                measureChildBeforeLayout(
+                       child, i, widthMeasureSpec, 0, heightMeasureSpec,
+                       totalWeight == 0 ? mTotalLength : 0);
+
+                if (oldHeight != Integer.MIN_VALUE) {
+                   lp.height = oldHeight;
+                }
+
+                final int childHeight = child.getMeasuredHeight();
+                final int totalLength = mTotalLength;
+                mTotalLength = Math.max(totalLength, totalLength + childHeight + lp.topMargin +
+                       lp.bottomMargin + getNextLocationOffset(child));
+
+                if (useLargestChild) {
+                    largestChildHeight = Math.max(childHeight, largestChildHeight);
+                }
+            }
+
+            /**
+             * If applicable, compute the additional offset to the child's baseline
+             * we'll need later when asked {@link #getBaseline}.
+             */
+            if ((baselineChildIndex >= 0) && (baselineChildIndex == i + 1)) {
+               mBaselineChildTop = mTotalLength;
+            }
+
+            // if we are trying to use a child index for our baseline, the above
+            // book keeping only works if there are no children above it with
+            // weight.  fail fast to aid the developer.
+            if (i < baselineChildIndex && lp.weight > 0) {
+                throw new RuntimeException("A child of LinearLayout with index "
+                        + "less than mBaselineAlignedChildIndex has weight > 0, which "
+                        + "won't work.  Either remove the weight, or don't set "
+                        + "mBaselineAlignedChildIndex.");
+            }
+
+            boolean matchWidthLocally = false;
+            if (widthMode != MeasureSpec.EXACTLY && lp.width == LayoutParams.MATCH_PARENT) {
+                // The width of the linear layout will scale, and at least one
+                // child said it wanted to match our width. Set a flag
+                // indicating that we need to remeasure at least that view when
+                // we know our width.
+                matchWidth = true;
+                matchWidthLocally = true;
+            }
+
+            final int margin = lp.leftMargin + lp.rightMargin;
+            final int measuredWidth = child.getMeasuredWidth() + margin;
+            maxWidth = Math.max(maxWidth, measuredWidth);
+            childState = combineMeasuredStates(childState, child.getMeasuredState());
+
+            allFillParent = allFillParent && lp.width == LayoutParams.MATCH_PARENT;
+            if (lp.weight > 0) {
+                /*
+                 * Widths of weighted Views are bogus if we end up
+                 * remeasuring, so keep them separate.
+                 */
+                weightedMaxWidth = Math.max(weightedMaxWidth,
+                        matchWidthLocally ? margin : measuredWidth);
+            } else {
+                alternativeMaxWidth = Math.max(alternativeMaxWidth,
+                        matchWidthLocally ? margin : measuredWidth);
+            }
+
+            i += getChildrenSkipCount(child, i);
+        }
+
+        if (mTotalLength > 0 && hasDividerBeforeChildAt(count)) {
+            mTotalLength += mDividerHeight;
+        }
+
+        if (useLargestChild &&
+                (heightMode == MeasureSpec.AT_MOST || heightMode == MeasureSpec.UNSPECIFIED)) {
+            mTotalLength = 0;
+
+            for (int i = 0; i < count; ++i) {
+                final View child = getVirtualChildAt(i);
+
+                if (child == null) {
+                    mTotalLength += measureNullChild(i);
+                    continue;
+                }
+
+                if (child.getVisibility() == GONE) {
+                    i += getChildrenSkipCount(child, i);
+                    continue;
+                }
+
+                final LayoutParams lp = (LayoutParams)
+                        child.getLayoutParams();
+                // Account for negative margins
+                final int totalLength = mTotalLength;
+                mTotalLength = Math.max(totalLength, totalLength + largestChildHeight +
+                        lp.topMargin + lp.bottomMargin + getNextLocationOffset(child));
+            }
+        }
+
+        // Add in our padding
+        mTotalLength += mPaddingTop + mPaddingBottom;
+
+        int heightSize = mTotalLength;
+
+        // Check against our minimum height
+        heightSize = Math.max(heightSize, getSuggestedMinimumHeight());
+
+        // Reconcile our calculated size with the heightMeasureSpec
+        int heightSizeAndState = resolveSizeAndState(heightSize, heightMeasureSpec, 0);
+        heightSize = heightSizeAndState & MEASURED_SIZE_MASK;
+
+        // Either expand children with weight to take up available space or
+        // shrink them if they extend beyond our current bounds. If we skipped
+        // measurement on any children, we need to measure them now.
+        int delta = heightSize - mTotalLength;
+        if (skippedMeasure || delta != 0 && totalWeight > 0.0f) {
+            float weightSum = mWeightSum > 0.0f ? mWeightSum : totalWeight;
+
+            mTotalLength = 0;
+
+            for (int i = 0; i < count; ++i) {
+                final View child = getVirtualChildAt(i);
+
+                if (child.getVisibility() == View.GONE) {
+                    continue;
+                }
+
+                LayoutParams lp = (LayoutParams) child.getLayoutParams();
+
+                float childExtra = lp.weight;
+
+                // MatchParentShrinkingLinearLayout custom code starts here.
+                if (childExtra > 0 && delta > 0) {
+                    // Child said it could absorb extra space -- give him his share
+                    int share = (int) (childExtra * delta / weightSum);
+                    weightSum -= childExtra;
+                    delta -= share;
+
+                    final int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec,
+                            mPaddingLeft + mPaddingRight +
+                                    lp.leftMargin + lp.rightMargin, lp.width);
+
+                    // TODO: Use a field like lp.isMeasured to figure out if this
+                    // child has been previously measured
+                    if ((lp.height != 0) || (heightMode != MeasureSpec.EXACTLY)) {
+                        // child was measured once already above...
+                        // base new measurement on stored values
+                        int childHeight = child.getMeasuredHeight() + share;
+                        if (childHeight < 0) {
+                            childHeight = 0;
+                        }
+
+                        child.measure(childWidthMeasureSpec,
+                                MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY));
+                    } else {
+                        // child was skipped in the loop above.
+                        // Measure for this first time here
+                        child.measure(childWidthMeasureSpec,
+                                MeasureSpec.makeMeasureSpec(share > 0 ? share : 0,
+                                        MeasureSpec.EXACTLY));
+                    }
+
+                    // Child may now not fit in vertical dimension.
+                    childState = combineMeasuredStates(childState, child.getMeasuredState()
+                            & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT));
+                } else if (delta < 0 && lp.height == LayoutParams.MATCH_PARENT) {
+                    final int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec,
+                            mPaddingLeft + mPaddingRight +
+                                    lp.leftMargin + lp.rightMargin, lp.width);
+
+                    int childHeight = child.getMeasuredHeight() + delta;
+                    if (childHeight < 0) {
+                        childHeight = 0;
+                    }
+                    delta -= childHeight - child.getMeasuredHeight();
+
+                    child.measure(childWidthMeasureSpec,
+                            MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY));
+
+                    // Child may now not fit in vertical dimension.
+                    childState = combineMeasuredStates(childState, child.getMeasuredState()
+                            & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT));
+                }
+                // MatchParentShrinkingLinearLayout custom code ends here.
+
+                final int margin =  lp.leftMargin + lp.rightMargin;
+                final int measuredWidth = child.getMeasuredWidth() + margin;
+                maxWidth = Math.max(maxWidth, measuredWidth);
+
+                boolean matchWidthLocally = widthMode != MeasureSpec.EXACTLY &&
+                        lp.width == LayoutParams.MATCH_PARENT;
+
+                alternativeMaxWidth = Math.max(alternativeMaxWidth,
+                        matchWidthLocally ? margin : measuredWidth);
+
+                allFillParent = allFillParent && lp.width == LayoutParams.MATCH_PARENT;
+
+                final int totalLength = mTotalLength;
+                mTotalLength = Math.max(totalLength, totalLength + child.getMeasuredHeight() +
+                        lp.topMargin + lp.bottomMargin + getNextLocationOffset(child));
+            }
+
+            // Add in our padding
+            mTotalLength += mPaddingTop + mPaddingBottom;
+            // TODO: Should we recompute the heightSpec based on the new total length?
+        } else {
+            alternativeMaxWidth = Math.max(alternativeMaxWidth,
+                                           weightedMaxWidth);
+
+
+            // We have no limit, so make all weighted views as tall as the largest child.
+            // Children will have already been measured once.
+            if (useLargestChild && heightMode != MeasureSpec.EXACTLY) {
+                for (int i = 0; i < count; i++) {
+                    final View child = getVirtualChildAt(i);
+
+                    if (child == null || child.getVisibility() == View.GONE) {
+                        continue;
+                    }
+
+                    final LayoutParams lp = (LayoutParams) child.getLayoutParams();
+
+                    float childExtra = lp.weight;
+                    if (childExtra > 0) {
+                        child.measure(
+                                MeasureSpec.makeMeasureSpec(child.getMeasuredWidth(),
+                                        MeasureSpec.EXACTLY),
+                                MeasureSpec.makeMeasureSpec(largestChildHeight,
+                                        MeasureSpec.EXACTLY));
+                    }
+                }
+            }
+        }
+
+        if (!allFillParent && widthMode != MeasureSpec.EXACTLY) {
+            maxWidth = alternativeMaxWidth;
+        }
+
+        maxWidth += mPaddingLeft + mPaddingRight;
+
+        // Check against our minimum width
+        maxWidth = Math.max(maxWidth, getSuggestedMinimumWidth());
+
+        setMeasuredDimension(resolveSizeAndState(maxWidth, widthMeasureSpec, childState),
+                heightSizeAndState);
+
+        if (matchWidth) {
+            forceUniformWidth(count, heightMeasureSpec);
+        }
+    }
+
+    private void forceUniformWidth(int count, int heightMeasureSpec) {
+        // Pretend that the linear layout has an exact size.
+        int uniformMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredWidth(),
+                MeasureSpec.EXACTLY);
+        for (int i = 0; i< count; ++i) {
+           final View child = getVirtualChildAt(i);
+           if (child.getVisibility() != GONE) {
+               LayoutParams lp =
+                       ((LayoutParams)child.getLayoutParams());
+
+               if (lp.width == LayoutParams.MATCH_PARENT) {
+                   // Temporarily force children to reuse their old measured height
+                   // FIXME: this may not be right for something like wrapping text?
+                   int oldHeight = lp.height;
+                   lp.height = child.getMeasuredHeight();
+
+                   // Remeasue with new dimensions
+                   measureChildWithMargins(child, uniformMeasureSpec, 0, heightMeasureSpec, 0);
+                   lp.height = oldHeight;
+               }
+           }
+        }
+    }
+
+    /**
+     * Measures the children when the orientation of this LinearLayout is set
+     * to {@link #HORIZONTAL}.
+     *
+     * @param widthMeasureSpec Horizontal space requirements as imposed by the parent.
+     * @param heightMeasureSpec Vertical space requirements as imposed by the parent.
+     *
+     * @see #getOrientation()
+     * @see #setOrientation(int)
+     * @see #onMeasure(int, int)
+     */
+    void measureHorizontal(int widthMeasureSpec, int heightMeasureSpec) {
+        // MatchParentShrinkingLinearLayout custom code starts here.
+        throw new IllegalStateException("horizontal mode not supported.");
+        // MatchParentShrinkingLinearLayout custom code ends here.
+    }
+
+    private void forceUniformHeight(int count, int widthMeasureSpec) {
+        // Pretend that the linear layout has an exact size. This is the measured height of
+        // ourselves. The measured height should be the max height of the children, changed
+        // to accommodate the heightMeasureSpec from the parent
+        int uniformMeasureSpec = MeasureSpec.makeMeasureSpec(getMeasuredHeight(),
+                MeasureSpec.EXACTLY);
+        for (int i = 0; i < count; ++i) {
+           final View child = getVirtualChildAt(i);
+           if (child.getVisibility() != GONE) {
+               LayoutParams lp = (LayoutParams) child.getLayoutParams();
+
+               if (lp.height == LayoutParams.MATCH_PARENT) {
+                   // Temporarily force children to reuse their old measured width
+                   // FIXME: this may not be right for something like wrapping text?
+                   int oldWidth = lp.width;
+                   lp.width = child.getMeasuredWidth();
+
+                   // Remeasure with new dimensions
+                   measureChildWithMargins(child, widthMeasureSpec, 0, uniformMeasureSpec, 0);
+                   lp.width = oldWidth;
+               }
+           }
+        }
+    }
+
+    /**
+     * <p>Returns the number of children to skip after measuring/laying out
+     * the specified child.</p>
+     *
+     * @param child the child after which we want to skip children
+     * @param index the index of the child after which we want to skip children
+     * @return the number of children to skip, 0 by default
+     */
+    int getChildrenSkipCount(View child, int index) {
+        return 0;
+    }
+
+    /**
+     * <p>Returns the size (width or height) that should be occupied by a null
+     * child.</p>
+     *
+     * @param childIndex the index of the null child
+     * @return the width or height of the child depending on the orientation
+     */
+    int measureNullChild(int childIndex) {
+        return 0;
+    }
+
+    /**
+     * <p>Measure the child according to the parent's measure specs. This
+     * method should be overriden by subclasses to force the sizing of
+     * children. This method is called by {@link #measureVertical(int, int)} and
+     * {@link #measureHorizontal(int, int)}.</p>
+     *
+     * @param child the child to measure
+     * @param childIndex the index of the child in this view
+     * @param widthMeasureSpec horizontal space requirements as imposed by the parent
+     * @param totalWidth extra space that has been used up by the parent horizontally
+     * @param heightMeasureSpec vertical space requirements as imposed by the parent
+     * @param totalHeight extra space that has been used up by the parent vertically
+     */
+    void measureChildBeforeLayout(View child, int childIndex,
+            int widthMeasureSpec, int totalWidth, int heightMeasureSpec,
+            int totalHeight) {
+        measureChildWithMargins(child, widthMeasureSpec, totalWidth,
+                heightMeasureSpec, totalHeight);
+    }
+
+    /**
+     * <p>Return the location offset of the specified child. This can be used
+     * by subclasses to change the location of a given widget.</p>
+     *
+     * @param child the child for which to obtain the location offset
+     * @return the location offset in pixels
+     */
+    int getLocationOffset(View child) {
+        return 0;
+    }
+
+    /**
+     * <p>Return the size offset of the next sibling of the specified child.
+     * This can be used by subclasses to change the location of the widget
+     * following <code>child</code>.</p>
+     *
+     * @param child the child whose next sibling will be moved
+     * @return the location offset of the next child in pixels
+     */
+    int getNextLocationOffset(View child) {
+        return 0;
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int l, int t, int r, int b) {
+        if (mOrientation == VERTICAL) {
+            layoutVertical(l, t, r, b);
+        } else {
+            layoutHorizontal(l, t, r, b);
+        }
+    }
+
+    /**
+     * Position the children during a layout pass if the orientation of this
+     * LinearLayout is set to {@link #VERTICAL}.
+     *
+     * @see #getOrientation()
+     * @see #setOrientation(int)
+     * @see #onLayout(boolean, int, int, int, int)
+     * @param left
+     * @param top
+     * @param right
+     * @param bottom
+     */
+    void layoutVertical(int left, int top, int right, int bottom) {
+        final int paddingLeft = mPaddingLeft;
+
+        int childTop;
+        int childLeft;
+
+        // Where right end of child should go
+        final int width = right - left;
+        int childRight = width - mPaddingRight;
+
+        // Space available for child
+        int childSpace = width - paddingLeft - mPaddingRight;
+
+        final int count = getVirtualChildCount();
+
+        final int majorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
+        final int minorGravity = mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK;
+
+        switch (majorGravity) {
+           case Gravity.BOTTOM:
+               // mTotalLength contains the padding already
+               childTop = mPaddingTop + bottom - top - mTotalLength;
+               break;
+
+               // mTotalLength contains the padding already
+           case Gravity.CENTER_VERTICAL:
+               childTop = mPaddingTop + (bottom - top - mTotalLength) / 2;
+               break;
+
+           case Gravity.TOP:
+           default:
+               childTop = mPaddingTop;
+               break;
+        }
+
+        for (int i = 0; i < count; i++) {
+            final View child = getVirtualChildAt(i);
+            if (child == null) {
+                childTop += measureNullChild(i);
+            } else if (child.getVisibility() != GONE) {
+                final int childWidth = child.getMeasuredWidth();
+                final int childHeight = child.getMeasuredHeight();
+
+                final LayoutParams lp =
+                        (LayoutParams) child.getLayoutParams();
+
+                int gravity = lp.gravity;
+                if (gravity < 0) {
+                    gravity = minorGravity;
+                }
+                final int layoutDirection = getLayoutDirection();
+                final int absoluteGravity = Gravity.getAbsoluteGravity(gravity, layoutDirection);
+                switch (absoluteGravity & Gravity.HORIZONTAL_GRAVITY_MASK) {
+                    case Gravity.CENTER_HORIZONTAL:
+                        childLeft = paddingLeft + ((childSpace - childWidth) / 2)
+                                + lp.leftMargin - lp.rightMargin;
+                        break;
+
+                    case Gravity.RIGHT:
+                        childLeft = childRight - childWidth - lp.rightMargin;
+                        break;
+
+                    case Gravity.LEFT:
+                    default:
+                        childLeft = paddingLeft + lp.leftMargin;
+                        break;
+                }
+
+                if (hasDividerBeforeChildAt(i)) {
+                    childTop += mDividerHeight;
+                }
+
+                childTop += lp.topMargin;
+                setChildFrame(child, childLeft, childTop + getLocationOffset(child),
+                        childWidth, childHeight);
+                childTop += childHeight + lp.bottomMargin + getNextLocationOffset(child);
+
+                i += getChildrenSkipCount(child, i);
+            }
+        }
+    }
+
+    @Override
+    public void onRtlPropertiesChanged(int layoutDirection) {
+        super.onRtlPropertiesChanged(layoutDirection);
+        if (layoutDirection != mLayoutDirection) {
+            mLayoutDirection = layoutDirection;
+            if (mOrientation == HORIZONTAL) {
+                requestLayout();
+            }
+        }
+    }
+
+    /**
+     * Position the children during a layout pass if the orientation of this
+     * LinearLayout is set to {@link #HORIZONTAL}.
+     *
+     * @see #getOrientation()
+     * @see #setOrientation(int)
+     * @see #onLayout(boolean, int, int, int, int)
+     * @param left
+     * @param top
+     * @param right
+     * @param bottom
+     */
+    void layoutHorizontal(int left, int top, int right, int bottom) {
+        final boolean isLayoutRtl = isLayoutRtl();
+        final int paddingTop = mPaddingTop;
+
+        int childTop;
+        int childLeft;
+
+        // Where bottom of child should go
+        final int height = bottom - top;
+        int childBottom = height - mPaddingBottom;
+
+        // Space available for child
+        int childSpace = height - paddingTop - mPaddingBottom;
+
+        final int count = getVirtualChildCount();
+
+        final int majorGravity = mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK;
+        final int minorGravity = mGravity & Gravity.VERTICAL_GRAVITY_MASK;
+
+        final boolean baselineAligned = mBaselineAligned;
+
+        final int[] maxAscent = mMaxAscent;
+        final int[] maxDescent = mMaxDescent;
+
+        final int layoutDirection = getLayoutDirection();
+        switch (Gravity.getAbsoluteGravity(majorGravity, layoutDirection)) {
+            case Gravity.RIGHT:
+                // mTotalLength contains the padding already
+                childLeft = mPaddingLeft + right - left - mTotalLength;
+                break;
+
+            case Gravity.CENTER_HORIZONTAL:
+                // mTotalLength contains the padding already
+                childLeft = mPaddingLeft + (right - left - mTotalLength) / 2;
+                break;
+
+            case Gravity.LEFT:
+            default:
+                childLeft = mPaddingLeft;
+                break;
+        }
+
+        int start = 0;
+        int dir = 1;
+        //In case of RTL, start drawing from the last child.
+        if (isLayoutRtl) {
+            start = count - 1;
+            dir = -1;
+        }
+
+        for (int i = 0; i < count; i++) {
+            int childIndex = start + dir * i;
+            final View child = getVirtualChildAt(childIndex);
+
+            if (child == null) {
+                childLeft += measureNullChild(childIndex);
+            } else if (child.getVisibility() != GONE) {
+                final int childWidth = child.getMeasuredWidth();
+                final int childHeight = child.getMeasuredHeight();
+                int childBaseline = -1;
+
+                final LayoutParams lp =
+                        (LayoutParams) child.getLayoutParams();
+
+                if (baselineAligned && lp.height != LayoutParams.MATCH_PARENT) {
+                    childBaseline = child.getBaseline();
+                }
+
+                int gravity = lp.gravity;
+                if (gravity < 0) {
+                    gravity = minorGravity;
+                }
+
+                switch (gravity & Gravity.VERTICAL_GRAVITY_MASK) {
+                    case Gravity.TOP:
+                        childTop = paddingTop + lp.topMargin;
+                        if (childBaseline != -1) {
+                            childTop += maxAscent[INDEX_TOP] - childBaseline;
+                        }
+                        break;
+
+                    case Gravity.CENTER_VERTICAL:
+                        // Removed support for baseline alignment when layout_gravity or
+                        // gravity == center_vertical. See bug #1038483.
+                        // Keep the code around if we need to re-enable this feature
+                        // if (childBaseline != -1) {
+                        //     // Align baselines vertically only if the child is smaller than us
+                        //     if (childSpace - childHeight > 0) {
+                        //         childTop = paddingTop + (childSpace / 2) - childBaseline;
+                        //     } else {
+                        //         childTop = paddingTop + (childSpace - childHeight) / 2;
+                        //     }
+                        // } else {
+                        childTop = paddingTop + ((childSpace - childHeight) / 2)
+                                + lp.topMargin - lp.bottomMargin;
+                        break;
+
+                    case Gravity.BOTTOM:
+                        childTop = childBottom - childHeight - lp.bottomMargin;
+                        if (childBaseline != -1) {
+                            int descent = child.getMeasuredHeight() - childBaseline;
+                            childTop -= (maxDescent[INDEX_BOTTOM] - descent);
+                        }
+                        break;
+                    default:
+                        childTop = paddingTop;
+                        break;
+                }
+
+                if (hasDividerBeforeChildAt(childIndex)) {
+                    childLeft += mDividerWidth;
+                }
+
+                childLeft += lp.leftMargin;
+                setChildFrame(child, childLeft + getLocationOffset(child), childTop,
+                        childWidth, childHeight);
+                childLeft += childWidth + lp.rightMargin +
+                        getNextLocationOffset(child);
+
+                i += getChildrenSkipCount(child, childIndex);
+            }
+        }
+    }
+
+    private void setChildFrame(View child, int left, int top, int width, int height) {
+        child.layout(left, top, left + width, top + height);
+    }
+
+    /**
+     * Should the layout be a column or a row.
+     * @param orientation Pass {@link #HORIZONTAL} or {@link #VERTICAL}. Default
+     * value is {@link #HORIZONTAL}.
+     *
+     * @attr ref android.R.styleable#LinearLayout_orientation
+     */
+    public void setOrientation(@OrientationMode int orientation) {
+        if (mOrientation != orientation) {
+            mOrientation = orientation;
+            requestLayout();
+        }
+    }
+
+    /**
+     * Returns the current orientation.
+     *
+     * @return either {@link #HORIZONTAL} or {@link #VERTICAL}
+     */
+    @OrientationMode
+    public int getOrientation() {
+        return mOrientation;
+    }
+
+    /**
+     * Describes how the child views are positioned. Defaults to GRAVITY_TOP. If
+     * this layout has a VERTICAL orientation, this controls where all the child
+     * views are placed if there is extra vertical space. If this layout has a
+     * HORIZONTAL orientation, this controls the alignment of the children.
+     *
+     * @param gravity See {@link android.view.Gravity}
+     *
+     * @attr ref android.R.styleable#LinearLayout_gravity
+     */
+    @android.view.RemotableViewMethod
+    public void setGravity(int gravity) {
+        if (mGravity != gravity) {
+            if ((gravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) == 0) {
+                gravity |= Gravity.START;
+            }
+
+            if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == 0) {
+                gravity |= Gravity.TOP;
+            }
+
+            mGravity = gravity;
+            requestLayout();
+        }
+    }
+
+    @android.view.RemotableViewMethod
+    public void setHorizontalGravity(int horizontalGravity) {
+        final int gravity = horizontalGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK;
+        if ((mGravity & Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) != gravity) {
+            mGravity = (mGravity & ~Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) | gravity;
+            requestLayout();
+        }
+    }
+
+    @android.view.RemotableViewMethod
+    public void setVerticalGravity(int verticalGravity) {
+        final int gravity = verticalGravity & Gravity.VERTICAL_GRAVITY_MASK;
+        if ((mGravity & Gravity.VERTICAL_GRAVITY_MASK) != gravity) {
+            mGravity = (mGravity & ~Gravity.VERTICAL_GRAVITY_MASK) | gravity;
+            requestLayout();
+        }
+    }
+
+    @Override
+    public LayoutParams generateLayoutParams(AttributeSet attrs) {
+        return new LayoutParams(getContext(), attrs);
+    }
+
+    /**
+     * Returns a set of layout parameters with a width of
+     * {@link android.view.ViewGroup.LayoutParams#MATCH_PARENT}
+     * and a height of {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT}
+     * when the layout's orientation is {@link #VERTICAL}. When the orientation is
+     * {@link #HORIZONTAL}, the width is set to {@link LayoutParams#WRAP_CONTENT}
+     * and the height to {@link LayoutParams#WRAP_CONTENT}.
+     */
+    @Override
+    protected LayoutParams generateDefaultLayoutParams() {
+        if (mOrientation == HORIZONTAL) {
+            return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
+        } else if (mOrientation == VERTICAL) {
+            return new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
+        }
+        return null;
+    }
+
+    @Override
+    protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
+        return new LayoutParams(p);
+    }
+
+
+    // Override to allow type-checking of LayoutParams.
+    @Override
+    protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
+        return p instanceof LayoutParams;
+    }
+
+    @Override
+    public CharSequence getAccessibilityClassName() {
+        return MatchParentShrinkingLinearLayout.class.getName();
+    }
+
+    /** @hide */
+    @Override
+    protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
+        super.encodeProperties(encoder);
+        encoder.addProperty("layout:baselineAligned", mBaselineAligned);
+        encoder.addProperty("layout:baselineAlignedChildIndex", mBaselineAlignedChildIndex);
+        encoder.addProperty("measurement:baselineChildTop", mBaselineChildTop);
+        encoder.addProperty("measurement:orientation", mOrientation);
+        encoder.addProperty("measurement:gravity", mGravity);
+        encoder.addProperty("measurement:totalLength", mTotalLength);
+        encoder.addProperty("layout:totalLength", mTotalLength);
+        encoder.addProperty("layout:useLargestChild", mUseLargestChild);
+    }
+
+    /**
+     * Per-child layout information associated with ViewLinearLayout.
+     *
+     * @attr ref android.R.styleable#LinearLayout_Layout_layout_weight
+     * @attr ref android.R.styleable#LinearLayout_Layout_layout_gravity
+     */
+    public static class LayoutParams extends MarginLayoutParams {
+        /**
+         * Indicates how much of the extra space in the LinearLayout will be
+         * allocated to the view associated with these LayoutParams. Specify
+         * 0 if the view should not be stretched. Otherwise the extra pixels
+         * will be pro-rated among all views whose weight is greater than 0.
+         */
+        @ViewDebug.ExportedProperty(category = "layout")
+        public float weight;
+
+        /**
+         * Gravity for the view associated with these LayoutParams.
+         *
+         * @see android.view.Gravity
+         */
+        @ViewDebug.ExportedProperty(category = "layout", mapping = {
+            @ViewDebug.IntToString(from =  -1,                       to = "NONE"),
+            @ViewDebug.IntToString(from = Gravity.NO_GRAVITY,        to = "NONE"),
+            @ViewDebug.IntToString(from = Gravity.TOP,               to = "TOP"),
+            @ViewDebug.IntToString(from = Gravity.BOTTOM,            to = "BOTTOM"),
+            @ViewDebug.IntToString(from = Gravity.LEFT,              to = "LEFT"),
+            @ViewDebug.IntToString(from = Gravity.RIGHT,             to = "RIGHT"),
+            @ViewDebug.IntToString(from = Gravity.START,            to = "START"),
+            @ViewDebug.IntToString(from = Gravity.END,             to = "END"),
+            @ViewDebug.IntToString(from = Gravity.CENTER_VERTICAL,   to = "CENTER_VERTICAL"),
+            @ViewDebug.IntToString(from = Gravity.FILL_VERTICAL,     to = "FILL_VERTICAL"),
+            @ViewDebug.IntToString(from = Gravity.CENTER_HORIZONTAL, to = "CENTER_HORIZONTAL"),
+            @ViewDebug.IntToString(from = Gravity.FILL_HORIZONTAL,   to = "FILL_HORIZONTAL"),
+            @ViewDebug.IntToString(from = Gravity.CENTER,            to = "CENTER"),
+            @ViewDebug.IntToString(from = Gravity.FILL,              to = "FILL")
+        })
+        public int gravity = -1;
+
+        /**
+         * {@inheritDoc}
+         */
+        public LayoutParams(Context c, AttributeSet attrs) {
+            super(c, attrs);
+            TypedArray a = c.obtainStyledAttributes(
+                    attrs, com.android.internal.R.styleable.LinearLayout_Layout);
+
+            weight = a.getFloat(
+                    com.android.internal.R.styleable.LinearLayout_Layout_layout_weight, 0);
+            gravity = a.getInt(
+                    com.android.internal.R.styleable.LinearLayout_Layout_layout_gravity, -1);
+
+            a.recycle();
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        public LayoutParams(int width, int height) {
+            super(width, height);
+            weight = 0;
+        }
+
+        /**
+         * Creates a new set of layout parameters with the specified width, height
+         * and weight.
+         *
+         * @param width the width, either {@link #MATCH_PARENT},
+         *        {@link #WRAP_CONTENT} or a fixed size in pixels
+         * @param height the height, either {@link #MATCH_PARENT},
+         *        {@link #WRAP_CONTENT} or a fixed size in pixels
+         * @param weight the weight
+         */
+        public LayoutParams(int width, int height, float weight) {
+            super(width, height);
+            this.weight = weight;
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        public LayoutParams(ViewGroup.LayoutParams p) {
+            super(p);
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        public LayoutParams(MarginLayoutParams source) {
+            super(source);
+        }
+
+        /**
+         * Copy constructor. Clones the width, height, margin values, weight,
+         * and gravity of the source.
+         *
+         * @param source The layout params to copy from.
+         */
+        public LayoutParams(LayoutParams source) {
+            super(source);
+
+            this.weight = source.weight;
+            this.gravity = source.gravity;
+        }
+
+        @Override
+        public String debug(String output) {
+            return output + "MatchParentShrinkingLinearLayout.LayoutParams={width="
+                    + sizeToString(width) + ", height=" + sizeToString(height)
+                    + " weight=" + weight +  "}";
+        }
+
+        /** @hide */
+        @Override
+        protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
+            super.encodeProperties(encoder);
+
+            encoder.addProperty("layout:weight", weight);
+            encoder.addProperty("layout:gravity", gravity);
+        }
+    }
+}