Dismiss or cancel in SwipeDismissLayout on screen off.

Fix for situation where you palm the device while swiping away an
ambiactive activity (or rather, when you swipe slightly an ambiactive
activity during palm gesture). This would make the activity stay in half
dismissed state. Instead when the screen goes off, we either dismiss or
cancel the dismissal.

Change-Id: I82e699c00c25bc97dd95bc6473a17e5817f7667a

core/java/com/android/internal/widget/SwipeDismissLayout.java

@@ -16,9 +16,11 @@
 
 package com.android.internal.widget;
 
-import android.animation.TimeInterpolator;
 import android.app.Activity;
+import android.content.BroadcastReceiver;
 import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
 import android.content.res.TypedArray;
 import android.util.AttributeSet;
 import android.util.Log;
@@ -28,8 +30,6 @@ import android.view.View;
 import android.view.ViewConfiguration;
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
-import android.view.animation.AccelerateInterpolator;
-import android.view.animation.DecelerateInterpolator;
 import android.widget.FrameLayout;
 
 /**
@@ -62,10 +62,6 @@ public class SwipeDismissLayout extends FrameLayout {
     // Cached ViewConfiguration and system-wide constant values
     private int mSlop;
     private int mMinFlingVelocity;
-    private int mMaxFlingVelocity;
-    private long mAnimationTime;
-    private TimeInterpolator mCancelInterpolator;
-    private TimeInterpolator mDismissInterpolator;
 
     // Transient properties
     private int mActiveTouchId;
@@ -92,6 +88,18 @@ public class SwipeDismissLayout extends FrameLayout {
                     }
                 }
             };
+    private BroadcastReceiver mScreenOffReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (mDismissed) {
+                dismiss();
+            } else {
+                cancel();
+            }
+            resetMembers();
+        }
+    };
+    private IntentFilter mScreenOffFilter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
 
     private float mLastX;
 
@@ -114,11 +122,6 @@ public class SwipeDismissLayout extends FrameLayout {
         ViewConfiguration vc = ViewConfiguration.get(context);
         mSlop = vc.getScaledTouchSlop();
         mMinFlingVelocity = vc.getScaledMinimumFlingVelocity();
-        mMaxFlingVelocity = vc.getScaledMaximumFlingVelocity();
-        mAnimationTime = getContext().getResources().getInteger(
-                android.R.integer.config_shortAnimTime);
-        mCancelInterpolator = new DecelerateInterpolator(1.5f);
-        mDismissInterpolator = new AccelerateInterpolator(1.5f);
         TypedArray a = context.getTheme().obtainStyledAttributes(
                 com.android.internal.R.styleable.Theme);
         mUseDynamicTranslucency = !a.hasValue(
@@ -141,15 +144,17 @@ public class SwipeDismissLayout extends FrameLayout {
             getViewTreeObserver().addOnEnterAnimationCompleteListener(
                     mOnEnterAnimationCompleteListener);
         }
+        getContext().registerReceiver(mScreenOffReceiver, mScreenOffFilter);
     }
 
     @Override
     protected void onDetachedFromWindow() {
-        super.onDetachedFromWindow();
+        getContext().unregisterReceiver(mScreenOffReceiver);
         if (getContext() instanceof Activity) {
             getViewTreeObserver().removeOnEnterAnimationCompleteListener(
                     mOnEnterAnimationCompleteListener);
         }
+        super.onDetachedFromWindow();
     }
 
     @Override