Refine decorate view of QR Code scanner

1.Draw rounded corner line.
2.Paint 70% white transparency background.

Bug: 118797380
Test: make RunSettingsRoboTests
Change-Id: I1192e32cf4ec801a3efcad4287c2e547deeac3bf

color-check-baseline.xml

@@ -1,18 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <issues format="4">
 
-    <issue
-        id="LintError"
-        severity="Error"
-        message="No `.class` files were found in project &quot;.&quot;, so none of the classfile based checks could be run. Does the project need to be built first?"
-        category="Lint"
-        priority="10"
-        summary="Lint Failure"
-        explanation="This issue type represents a problem running lint itself. Examples include failure to find bytecode for source files (which means certain detectors could not be run), parsing errors in lint configuration files, etc.&#xA;These errors are not errors in your own code, but they are shown to make it clear that some checks were not completed.">
-        <location
-            file="."/>
-    </issue>
-
     <issue
         id="HardCodedColor"
         severity="Error"
@@ -1293,6 +1281,54 @@
             column="5"/>
     </issue>
 
+    <issue
+        id="HardCodedColor"
+        severity="Error"
+        message="Avoid using hardcoded color"
+        category="Correctness"
+        priority="4"
+        summary="Using hardcoded color"
+        explanation="Hardcoded color values are bad because theme changes cannot be uniformly applied.Instead use the theme specific colors such as `?android:attr/textColorPrimary` in attributes.&#xA;This ensures that a theme change from a light to a dark theme can be uniformlyapplied across the app."
+        errorLine1="    &lt;color name=&quot;qr_corner_line_color&quot;>#ffdadce0&lt;/color>"
+        errorLine2="    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="res/values/colors.xml"
+            line="133"
+            column="5"/>
+    </issue>
+
+    <issue
+        id="HardCodedColor"
+        severity="Error"
+        message="Avoid using hardcoded color"
+        category="Correctness"
+        priority="4"
+        summary="Using hardcoded color"
+        explanation="Hardcoded color values are bad because theme changes cannot be uniformly applied.Instead use the theme specific colors such as `?android:attr/textColorPrimary` in attributes.&#xA;This ensures that a theme change from a light to a dark theme can be uniformlyapplied across the app."
+        errorLine1="    &lt;color name=&quot;qr_focused_corner_line_color&quot;>#ff1a73e8&lt;/color>"
+        errorLine2="    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="res/values/colors.xml"
+            line="134"
+            column="5"/>
+    </issue>
+
+    <issue
+        id="HardCodedColor"
+        severity="Error"
+        message="Avoid using hardcoded color"
+        category="Correctness"
+        priority="4"
+        summary="Using hardcoded color"
+        explanation="Hardcoded color values are bad because theme changes cannot be uniformly applied.Instead use the theme specific colors such as `?android:attr/textColorPrimary` in attributes.&#xA;This ensures that a theme change from a light to a dark theme can be uniformlyapplied across the app."
+        errorLine1="    &lt;color name=&quot;qr_background_color&quot;>#b3ffffff&lt;/color> &lt;!-- 70% white transparency -->"
+        errorLine2="    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~">
+        <location
+            file="res/values/colors.xml"
+            line="135"
+            column="5"/>
+    </issue>
+
     <issue
         id="HardCodedColor"
         severity="Error"
@@ -2441,7 +2477,7 @@
         errorLine2="                                   ~~~~~~~~~~~~~~~~~~~">
         <location
             file="res/values/strings.xml"
-            line="5805"
+            line="5883"
             column="36"/>
     </issue>
 
@@ -2473,7 +2509,7 @@
         errorLine2="                                           ^">
         <location
             file="res/values/styles.xml"
-            line="425"
+            line="415"
             column="44"/>
     </issue>
 
@@ -2489,7 +2525,7 @@
         errorLine2="                                           ^">
         <location
             file="res/values/styles.xml"
-            line="431"
+            line="421"
             column="44"/>
     </issue>
 
@@ -2505,7 +2541,7 @@
         errorLine2="                                           ^">
         <location
             file="res/values/styles.xml"
-            line="432"
+            line="422"
             column="44"/>
     </issue>
 
@@ -2521,23 +2557,7 @@
         errorLine2="                                 ^">
         <location
             file="res/values/styles.xml"
-            line="467"
+            line="457"
-            column="34"/>
-    </issue>
-
-    <issue
-        id="HardCodedColor"
-        severity="Error"
-        message="Avoid using hardcoded color"
-        category="Correctness"
-        priority="4"
-        summary="Using hardcoded color"
-        explanation="Hardcoded color values are bad because theme changes cannot be uniformly applied.Instead use the theme specific colors such as `?android:attr/textColorPrimary` in attributes.&#xA;This ensures that a theme change from a light to a dark theme can be uniformlyapplied across the app."
-        errorLine1="        &lt;item name=&quot;strokeColor&quot;>@color/homepage_card_stroke_color&lt;/item>"
-        errorLine2="                                 ^">
-        <location
-            file="res/values/styles.xml"
-            line="474"
             column="34"/>
     </issue>
 
@@ -2553,7 +2573,7 @@
         errorLine2="                                      ^">
         <location
             file="res/values/themes.xml"
-            line="54"
+            line="57"
             column="39"/>
     </issue>
 
@@ -2569,7 +2589,7 @@
         errorLine2="                                       ^">
         <location
             file="res/values/themes.xml"
-            line="55"
+            line="58"
             column="40"/>
     </issue>
 
@@ -2585,7 +2605,7 @@
         errorLine2="                                     ^">
         <location
             file="res/values/themes.xml"
-            line="56"
+            line="59"
             column="38"/>
     </issue>
 
@@ -2601,7 +2621,7 @@
         errorLine2="                                              ^">
         <location
             file="res/values/themes.xml"
-            line="90"
+            line="97"
             column="47"/>
     </issue>
 
@@ -2617,7 +2637,7 @@
         errorLine2="                                              ^">
         <location
             file="res/values/themes.xml"
-            line="90"
+            line="97"
             column="47"/>
     </issue>
 
@@ -2633,7 +2653,7 @@
         errorLine2="                                       ^">
         <location
             file="res/values/themes.xml"
-            line="96"
+            line="103"
             column="40"/>
     </issue>
 
@@ -2649,7 +2669,7 @@
         errorLine2="                                       ^">
         <location
             file="res/values/themes.xml"
-            line="96"
+            line="103"
             column="40"/>
     </issue>
 
@@ -2665,7 +2685,7 @@
         errorLine2="                                            ^">
         <location
             file="res/values/themes.xml"
-            line="159"
+            line="166"
             column="45"/>
     </issue>
 
@@ -2681,7 +2701,7 @@
         errorLine2="                                                ^">
         <location
             file="res/values/themes.xml"
-            line="160"
+            line="167"
             column="49"/>
     </issue>
 
@@ -2697,7 +2717,7 @@
         errorLine2="                                            ^">
         <location
             file="res/values/themes.xml"
-            line="168"
+            line="175"
             column="45"/>
     </issue>
 
@@ -2713,7 +2733,7 @@
         errorLine2="                                                ^">
         <location
             file="res/values/themes.xml"
-            line="169"
+            line="176"
             column="49"/>
     </issue>
 
@@ -2729,7 +2749,7 @@
         errorLine2="                                      ^">
         <location
             file="res/values/themes.xml"
-            line="185"
+            line="192"
             column="39"/>
     </issue>
 
@@ -2745,7 +2765,7 @@
         errorLine2="                                       ^">
         <location
             file="res/values/themes.xml"
-            line="186"
+            line="193"
             column="40"/>
     </issue>
 
@@ -2761,7 +2781,7 @@
         errorLine2="                                     ^">
         <location
             file="res/values/themes.xml"
-            line="187"
+            line="194"
             column="38"/>
     </issue>
 

res/values/colors.xml

@@ -128,5 +128,10 @@
 
     <!-- launcher icon color -->
     <color name="icon_launcher_setting_color">@*android:color/accent_device_default_light</color>
-</resources>
 
+    <!-- QR code scanner colors -->
+    <color name="qr_corner_line_color">#ffdadce0</color>
+    <color name="qr_focused_corner_line_color">#ff1a73e8</color>
+    <color name="qr_background_color">#b3ffffff</color> <!-- 70% white transparency -->
+    <!-- End of QR code scanner colors -->
+</resources>

src/com/android/settings/wifi/qrcode/QrDecorateView.java

@@ -17,10 +17,13 @@
 package com.android.settings.wifi.qrcode;
 
 import android.content.Context;
+import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Paint;
 import android.graphics.Point;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.util.AttributeSet;
@@ -33,11 +36,26 @@ import com.android.settings.R;
  * Draws the lines at the corner of the inner frame.
  */
 public class QrDecorateView extends View {
-    private static final float CORNER_STROKE_WIDTH = 3f;    // 3dp
+    private static final float CORNER_STROKE_WIDTH = 4f;    // 4dp
-    private static final float CORNER_LINE_LENGTH = 20f;    // 20dp
+    private static final float CORNER_LINE_LENGTH = 264f;   // 264dp
+    private static final float CORNER_RADIUS = 16f;         // 16dp
+
+    final private int mCornerColor;
+    final private int mFocusedCornerColor;
+    final private int mBackgroundColor;
+
+    final private Paint mStrokePaint;
+    final private Paint mTransparentPaint;
+    final private Paint mBackgroundPaint;
+
+    final private float mRadius;
+
+    private Bitmap mMaskBitmap;
+    private Canvas mMaskCanvas;
+
+    private RectF mOuterFrame;
+    private RectF mInnerFrame;
 
-    final private Paint mPaint;
-    private RectF mFrame;
     private boolean mFocused;
 
     public QrDecorateView(Context context) {
@@ -54,78 +72,66 @@ public class QrDecorateView extends View {
 
     public QrDecorateView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
         super(context, attrs, defStyleAttr, defStyleRes);
-        final float strokeWidth = TypedValue.applyDimension(
+
-                TypedValue.COMPLEX_UNIT_DIP,
-                CORNER_STROKE_WIDTH,
-                getResources().getDisplayMetrics()
-        );
-        mPaint = new Paint();
-        mPaint.setStrokeWidth(strokeWidth);
         mFocused = false;
+        mRadius = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, CORNER_RADIUS,
+                getResources().getDisplayMetrics());
+
+        mCornerColor = context.getResources().getColor(R.color.qr_corner_line_color);
+        mFocusedCornerColor = context.getResources().getColor(R.color.qr_focused_corner_line_color);
+        mBackgroundColor = context.getResources().getColor(R.color.qr_background_color);
+
+        mStrokePaint = new Paint();
+        mStrokePaint.setAntiAlias(true);
+
+        mTransparentPaint = new Paint();
+        mTransparentPaint.setAntiAlias(true);
+        mTransparentPaint.setColor(getResources().getColor(android.R.color.transparent));
+        mTransparentPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
+
+        mBackgroundPaint = new Paint();
+        mBackgroundPaint.setColor(mBackgroundColor);
+    }
+
+    @Override
+    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
+        super.onLayout(changed, left, top, right, bottom);
+
+        if(mMaskBitmap == null) {
+            mMaskBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
+            mMaskCanvas = new Canvas(mMaskBitmap);
+        }
+
+        calculateFramePos();
     }
 
     @Override
     protected void onDraw(Canvas canvas) {
-        calculateFramePos();
+        // Set frame line color.
-        final float cornerLineLength = TypedValue.applyDimension(
+        mStrokePaint.setColor(mFocused ? mFocusedCornerColor : mCornerColor);
-                TypedValue.COMPLEX_UNIT_DIP,
+        // Draw background color.
-                CORNER_LINE_LENGTH,
+        mMaskCanvas.drawColor(mBackgroundColor);
-                getResources().getDisplayMetrics()
+        // Draw outer corner.
-        );
+        mMaskCanvas.drawRoundRect(mOuterFrame, mRadius, mRadius, mStrokePaint);
-        mPaint.setColor(mFocused ? Color.GREEN : Color.WHITE);
+        // Draw inner transparent corner.
-        drawCorner(mFrame, cornerLineLength, canvas);
+        mMaskCanvas.drawRoundRect(mInnerFrame, mRadius, mRadius, mTransparentPaint);
-        super.onDraw(canvas);
-    }
 
-    private void drawCorner(RectF frame, float lineLength, Canvas canvas) {
+        canvas.drawBitmap(mMaskBitmap, 0, 0, mBackgroundPaint);
-        final float strokeWidth = TypedValue.applyDimension(
+        super.onDraw(canvas);
-                TypedValue.COMPLEX_UNIT_DIP,
-                CORNER_STROKE_WIDTH,
-                getResources().getDisplayMetrics()
-        );
-        // Draw top-left corner.
-        canvas.drawLine(
-                frame.left - strokeWidth / 2,
-                frame.top,
-                frame.left + lineLength,
-                frame.top,
-                mPaint);
-        canvas.drawLine(frame.left, frame.top, frame.left, frame.top + lineLength, mPaint);
-        // Draw top-right corner.
-        canvas.drawLine(
-                frame.right + strokeWidth / 2,
-                frame.top,
-                frame.right - lineLength,
-                frame.top,
-                mPaint);
-        canvas.drawLine(frame.right, frame.top, frame.right, frame.top + lineLength, mPaint);
-        // Draw bottom-left corner.
-        canvas.drawLine(
-                frame.left - strokeWidth / 2,
-                frame.bottom,
-                frame.left + lineLength,
-                frame.bottom,
-                mPaint);
-        canvas.drawLine(frame.left, frame.bottom, frame.left, frame.bottom - lineLength, mPaint);
-        // Draw bottom-right corner.
-        canvas.drawLine(
-                frame.right + strokeWidth / 2,
-                frame.bottom,
-                frame.right - lineLength,
-                frame.bottom,
-                mPaint);
-        canvas.drawLine(frame.right, frame.bottom, frame.right, frame.bottom - lineLength, mPaint);
     }
 
     private void calculateFramePos() {
         final int centralX = getWidth() / 2;
         final int centralY = getHeight() / 2;
-        final float halfFrameWidth = getWidth() / 3;
+        final float cornerLineLength = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
-        mFrame = new RectF(
+                CORNER_LINE_LENGTH, getResources().getDisplayMetrics()) / 2;
-                centralX - halfFrameWidth,
+        final float strokeWidth = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
-                centralY - halfFrameWidth,
+                CORNER_STROKE_WIDTH, getResources().getDisplayMetrics()) / 2;
-                centralX + halfFrameWidth,
+
-                centralY + halfFrameWidth);
+        mOuterFrame = new RectF(centralX - cornerLineLength, centralY - cornerLineLength,
+                centralX + cornerLineLength, centralY + cornerLineLength);
+        mInnerFrame = new RectF(mOuterFrame.left + strokeWidth, mOuterFrame.top + strokeWidth,
+                mOuterFrame.right - strokeWidth, mOuterFrame.bottom - strokeWidth);
     }
 
     // Draws green lines if focued. Otherwise, draws white lines.