Set panel launch mode to singleInstance and fix animation

Set panel launch mode to singleInstance to avoid panel can show up
infinite time when user keep launching panels (Easy repro by
pressing volume hard key > settings again and again).

After changing launch mode to singleInstance, we will need to do
some refactors, to avoid weirdness when adding/changing/closing
panels:
1. Move and refactor logic in SettingsPanelActivity#onCreate.
   We will need onNewIntent here to handle Panel launching, since
   we only have one instance of SettingsPanelActivity now.

   Also do refactor here to reuse the PanelFragment instead of
   creating one every single time, to better handle the exit
   animation, avoid janky exit behavior from the old PanelFragment

2. Move logic from PanelFragment#onCreateView, to reuse it when
   updating panel content.

   Also add exiting animation when we are transitioning the panel
   from one to another.  Also add alpha animation to make it move
   more smoothly.

3. Adding flags to launch see more intent in settings.

Fixes: 131225920
Fixes: 131254399
Test: manual
Change-Id: I93d3708bd02a2d736e38685475f2d9988ef62d31

AndroidManifest.xml

@@ -3110,7 +3110,7 @@
         <activity android:name=".panel.SettingsPanelActivity"
             android:label="@string/settings_panel_title"
             android:theme="@style/Theme.Panel"
-            android:documentLaunchMode="always"
+            android:launchMode="singleInstance"
             android:excludeFromRecents="true"
             android:exported="true">
                  <intent-filter>

src/com/android/settings/media/MediaOutputIndicatorSlice.java

@@ -90,7 +90,7 @@ public class MediaOutputIndicatorSlice implements CustomSliceable {
     private Intent getMediaOutputSliceIntent() {
         final Intent intent = new Intent()
                 .setAction(MediaOutputSliceConstants.ACTION_MEDIA_OUTPUT)
-                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
+                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         return intent;
     }
 

src/com/android/settings/panel/InternetConnectivityPanel.java

@@ -63,7 +63,8 @@ public class InternetConnectivityPanel implements PanelContent {
 
     @Override
     public Intent getSeeMoreIntent() {
-        return new Intent(Settings.ACTION_WIRELESS_SETTINGS);
+        return new Intent(Settings.ACTION_WIRELESS_SETTINGS)
+                .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     }
 
     @Override

src/com/android/settings/panel/NfcPanel.java

@@ -64,6 +64,7 @@ public class NfcPanel implements PanelContent {
                 screenTitle,
                 SettingsEnums.SETTINGS_CONNECTED_DEVICE_CATEGORY);
         intent.setClassName(mContext.getPackageName(), SubSettings.class.getName());
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         return intent;
     }
 

src/com/android/settings/panel/PanelFragment.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.panel;
 
+import android.animation.Animator;
+import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
@@ -29,7 +31,6 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.animation.DecelerateInterpolator;
-import android.view.animation.Interpolator;
 import android.widget.Button;
 import android.widget.TextView;
 
@@ -59,9 +60,14 @@ public class PanelFragment extends Fragment {
     private static final String TAG = "PanelFragment";
 
     /**
-     * Duration of the animation entering or exiting the screen, in milliseconds.
+     * Duration of the animation entering the screen, in milliseconds.
      */
-    private static final int DURATION_ANIMATE_PANEL_MS = 250;
+    private static final int DURATION_ANIMATE_PANEL_EXPAND_MS = 250;
+
+    /**
+     * Duration of the animation exiting the screen, in milliseconds.
+     */
+    private static final int DURATION_ANIMATE_PANEL_COLLAPSE_MS = 200;
 
     /**
      * Duration of timeout waiting for Slice data to bind, in milliseconds.
@@ -104,15 +110,53 @@ public class PanelFragment extends Fragment {
     @Override
     public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
             @Nullable Bundle savedInstanceState) {
-        final FragmentActivity activity = getActivity();
-
         mLayoutView = inflater.inflate(R.layout.panel_layout, container, false);
+        createPanelContent();
+        return mLayoutView;
+    }
+
+    /**
+     * Animate the old panel out from the screen, then update the panel with new content once the
+     * animation is done.
+     * <p>
+     *     Takes the entire panel and animates out from behind the navigation bar.
+     * <p>
+     *     Call createPanelContent() once animation end.
+     */
+    void updatePanelWithAnimation() {
+        final View panelContent = mLayoutView.findViewById(R.id.panel_container);
+        final AnimatorSet animatorSet = buildAnimatorSet(mLayoutView,
+                0.0f /* startY */, panelContent.getHeight() /* endY */,
+                1.0f /* startAlpha */, 0.0f /* endAlpha */,
+                DURATION_ANIMATE_PANEL_COLLAPSE_MS);
+
+        final ValueAnimator animator = new ValueAnimator();
+        animator.setFloatValues(0.0f, 1.0f);
+        animatorSet.play(animator);
+        animatorSet.addListener(new AnimatorListenerAdapter() {
+            @Override
+            public void onAnimationEnd(Animator animation) {
+                createPanelContent();
+            }
+        });
+        animatorSet.start();
+    }
+
+    private void createPanelContent() {
+        final FragmentActivity activity = getActivity();
+        if (mLayoutView == null) {
+            activity.finish();
+        }
 
         mPanelSlices = mLayoutView.findViewById(R.id.panel_parent_layout);
         mSeeMoreButton = mLayoutView.findViewById(R.id.see_more);
         mDoneButton = mLayoutView.findViewById(R.id.done);
         mTitleView = mLayoutView.findViewById(R.id.panel_title);
 
+        // Make the panel layout gone here, to avoid janky animation when updating from old panel.
+        // We will make it visible once the panel is ready to load.
+        mPanelSlices.setVisibility(View.GONE);
+
         final Bundle arguments = getArguments();
         final String panelType =
                 arguments.getString(SettingsPanelActivity.KEY_PANEL_TYPE_ARGUMENT);
@@ -152,8 +196,6 @@ public class PanelFragment extends Fragment {
                 mPanel.getMetricsCategory(),
                 callingPackageName,
                 0 /* value */);
-
-        return mLayoutView;
     }
 
     private void loadAllSlices() {
@@ -220,6 +262,7 @@ public class PanelFragment extends Fragment {
             mPanelSlices.setAdapter(mAdapter);
             mPanelSlices.getViewTreeObserver()
                     .addOnGlobalLayoutListener(mOnGlobalLayoutListener);
+            mPanelSlices.setVisibility(View.VISIBLE);
 
             DividerItemDecoration itemDecoration = new DividerItemDecoration(getActivity());
             itemDecoration
@@ -237,8 +280,10 @@ public class PanelFragment extends Fragment {
      */
     private void animateIn() {
         final View panelContent = mLayoutView.findViewById(R.id.panel_container);
-        final AnimatorSet animatorSet = buildAnimatorSet(mLayoutView, panelContent.getHeight(),
+        final AnimatorSet animatorSet = buildAnimatorSet(mLayoutView,
-                0.0f, new DecelerateInterpolator());
+                panelContent.getHeight() /* startY */, 0.0f /* endY */,
+                0.0f /* startAlpha */, 1.0f /* endAlpha */,
+                DURATION_ANIMATE_PANEL_EXPAND_MS);
         final ValueAnimator animator = new ValueAnimator();
         animator.setFloatValues(0.0f, 1.0f);
         animatorSet.play(animator);
@@ -248,18 +293,21 @@ public class PanelFragment extends Fragment {
     }
 
     /**
-     * Build an {@link AnimatorSet} to bring the Panel, {@param parentView}in our out of the screen,
+     * Build an {@link AnimatorSet} to animate the Panel, {@param parentView} in or out of the
-     * based on the positional parameters {@param startY}, {@param endY} and at the rate set by the
+     * screen, based on the positional parameters {@param startY}, {@param endY}, the parameters
-     * {@param interpolator}.
+     * for alpha changes {@param startAlpha}, {@param endAlpha}, and the {@param duration} in
+     * milliseconds.
      */
     @NonNull
     private static AnimatorSet buildAnimatorSet(@NonNull View parentView, float startY, float endY,
-            @NonNull Interpolator interpolator) {
+            float startAlpha, float endAlpha, int duration) {
         final View sheet = parentView.findViewById(R.id.panel_container);
         final AnimatorSet animatorSet = new AnimatorSet();
-        animatorSet.setDuration(DURATION_ANIMATE_PANEL_MS);
+        animatorSet.setDuration(duration);
-        animatorSet.setInterpolator(interpolator);
+        animatorSet.setInterpolator(new DecelerateInterpolator());
-        animatorSet.playTogether(ObjectAnimator.ofFloat(sheet, View.TRANSLATION_Y, startY, endY));
+        animatorSet.playTogether(
+                ObjectAnimator.ofFloat(sheet, View.TRANSLATION_Y, startY, endY),
+                ObjectAnimator.ofFloat(sheet, View.ALPHA, startAlpha,endAlpha));
         return animatorSet;
     }
 

src/com/android/settings/panel/SettingsPanelActivity.java

@@ -21,6 +21,7 @@ import static com.android.settingslib.media.MediaOutputSliceConstants.EXTRA_PACK
 import android.app.settings.SettingsEnums;
 import android.content.Intent;
 import android.os.Bundle;
+import android.text.TextUtils;
 import android.util.Log;
 import android.view.Gravity;
 import android.view.MotionEvent;
@@ -65,7 +66,17 @@ public class SettingsPanelActivity extends FragmentActivity {
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        showOrUpdatePanel();
+    }
 
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        setIntent(intent);
+        showOrUpdatePanel();
+    }
+
+    private void showOrUpdatePanel() {
         final Intent callingIntent = getIntent();
         if (callingIntent == null) {
             Log.e(TAG, "Null intent, closing Panel Activity");
@@ -76,6 +87,19 @@ public class SettingsPanelActivity extends FragmentActivity {
         // We will use it once media output switch panel support remote device.
         final String mediaPackageName = callingIntent.getStringExtra(EXTRA_PACKAGE_NAME);
 
+        mBundle.putString(KEY_PANEL_TYPE_ARGUMENT, callingIntent.getAction());
+        mBundle.putString(KEY_CALLING_PACKAGE_NAME, getCallingPackage());
+        mBundle.putString(KEY_MEDIA_PACKAGE_NAME, mediaPackageName);
+
+        final FragmentManager fragmentManager = getSupportFragmentManager();
+        final Fragment fragment = fragmentManager.findFragmentById(R.id.main_content);
+
+        // If fragment already exists, we will need to update panel with animation.
+        if (fragment != null && fragment instanceof PanelFragment) {
+            final PanelFragment panelFragment = (PanelFragment) fragment;
+            panelFragment.setArguments(mBundle);
+            ((PanelFragment) fragment).updatePanelWithAnimation();
+        } else {
             setContentView(R.layout.settings_panel);
 
             // Move the window to the bottom of screen, and make it take up the entire screen width.
@@ -83,17 +107,8 @@ public class SettingsPanelActivity extends FragmentActivity {
             window.setGravity(Gravity.BOTTOM);
             window.setLayout(WindowManager.LayoutParams.MATCH_PARENT,
                     WindowManager.LayoutParams.WRAP_CONTENT);
-
-        mBundle.putString(KEY_PANEL_TYPE_ARGUMENT, callingIntent.getAction());
-        mBundle.putString(KEY_CALLING_PACKAGE_NAME, getCallingPackage());
-        mBundle.putString(KEY_MEDIA_PACKAGE_NAME, mediaPackageName);
-
             final PanelFragment panelFragment = new PanelFragment();
             panelFragment.setArguments(mBundle);
-
-        final FragmentManager fragmentManager = getSupportFragmentManager();
-        final Fragment fragment = fragmentManager.findFragmentById(R.id.main_content);
-        if (fragment == null) {
             fragmentManager.beginTransaction().add(R.id.main_content, panelFragment).commit();
         }
     }

src/com/android/settings/panel/VolumePanel.java

@@ -68,7 +68,7 @@ public class VolumePanel implements PanelContent {
 
     @Override
     public Intent getSeeMoreIntent() {
-        return new Intent(Settings.ACTION_SOUND_SETTINGS);
+        return new Intent(Settings.ACTION_SOUND_SETTINGS).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
     }
 
     @Override

src/com/android/settings/panel/WifiPanel.java

@@ -67,6 +67,7 @@ public class WifiPanel implements PanelContent {
                 screenTitle,
                 SettingsEnums.WIFI);
         intent.setClassName(mContext.getPackageName(), SubSettings.class.getName());
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         return intent;
     }