Avoid reflection with ObjectAnimator

Use explicit FloatProperty proxies for routing ObjectAnimator updates.
This prevents issues with Proguard-related shrinking/optimization for
custom class types.

Test: atest SystemUITests + manual validation of error logs
Bug: 203472868
Change-Id: Ie0889101f1063a929d2052756b1f4008f2b84a92

core/java/android/inputmethodservice/navigationbar/DeadZone.java

@@ -27,6 +27,7 @@ import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.os.SystemClock;
+import android.util.FloatProperty;
 import android.util.Log;
 import android.view.MotionEvent;
 import android.view.Surface;
@@ -46,6 +47,20 @@ final class DeadZone {
     public static final int VERTICAL = 1;  // Consume taps along the left edge.
 
     private static final boolean CHATTY = true; // print to logcat when we eat a click
+
+    private static final FloatProperty<DeadZone> FLASH_PROPERTY =
+            new FloatProperty<DeadZone>("DeadZoneFlash") {
+        @Override
+        public void setValue(DeadZone object, float value) {
+            object.setFlash(value);
+        }
+
+        @Override
+        public Float get(DeadZone object) {
+            return object.getFlash();
+        }
+    };
+
     private final NavigationBarView mNavigationBarView;
 
     private boolean mShouldFlash;
@@ -63,7 +78,7 @@ final class DeadZone {
     private final Runnable mDebugFlash = new Runnable() {
         @Override
         public void run() {
-            ObjectAnimator.ofFloat(DeadZone.this, "flash", 1f, 0f).setDuration(150).start();
+            ObjectAnimator.ofFloat(DeadZone.this, FLASH_PROPERTY, 1f, 0f).setDuration(150).start();
         }
     };
 

packages/SystemUI/src/com/android/systemui/ExpandHelper.java

@@ -23,6 +23,7 @@ import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.ObjectAnimator;
 import android.content.Context;
+import android.util.FloatProperty;
 import android.util.Log;
 import android.view.Gravity;
 import android.view.HapticFeedbackConstants;
@@ -69,6 +70,19 @@ public class ExpandHelper implements Gefingerpoken {
     // 2f: maximum brightness is stretching a 1U to 3U, or a 4U to 6U
     private static final float STRETCH_INTERVAL = 2f;
 
+    private static final FloatProperty<ViewScaler> VIEW_SCALER_HEIGHT_PROPERTY =
+            new FloatProperty<ViewScaler>("ViewScalerHeight") {
+        @Override
+        public void setValue(ViewScaler object, float value) {
+            object.setHeight(value);
+        }
+
+        @Override
+        public Float get(ViewScaler object) {
+            return object.getHeight();
+        }
+    };
+
     @SuppressWarnings("unused")
     private Context mContext;
 
@@ -147,6 +161,7 @@ public class ExpandHelper implements Gefingerpoken {
         public void setView(ExpandableView v) {
             mView = v;
         }
+
         public void setHeight(float h) {
             if (DEBUG_SCALE) Log.v(TAG, "SetHeight: setting to " + h);
             mView.setActualHeight((int) h);
@@ -176,7 +191,7 @@ public class ExpandHelper implements Gefingerpoken {
         mCallback = callback;
         mScaler = new ViewScaler();
         mGravity = Gravity.TOP;
-        mScaleAnimation = ObjectAnimator.ofFloat(mScaler, "height", 0f);
+        mScaleAnimation = ObjectAnimator.ofFloat(mScaler, VIEW_SCALER_HEIGHT_PROPERTY, 0f);
         mPullGestureMinXSpan = mContext.getResources().getDimension(R.dimen.pull_span_min);
 
         final ViewConfiguration configuration = ViewConfiguration.get(mContext);

packages/SystemUI/src/com/android/systemui/navigationbar/buttons/DeadZone.java

@@ -20,6 +20,7 @@ import android.animation.ObjectAnimator;
 import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.os.SystemClock;
+import android.util.FloatProperty;
 import android.util.Slog;
 import android.view.MotionEvent;
 import android.view.Surface;
@@ -44,6 +45,20 @@ public class DeadZone {
     public static final int VERTICAL = 1;  // Consume taps along the left edge.
 
     private static final boolean CHATTY = true; // print to logcat when we eat a click
+
+    private static final FloatProperty<DeadZone> FLASH_PROPERTY =
+            new FloatProperty<DeadZone>("DeadZoneFlash") {
+        @Override
+        public void setValue(DeadZone object, float value) {
+            object.setFlash(value);
+        }
+
+        @Override
+        public Float get(DeadZone object) {
+            return object.getFlash();
+        }
+    };
+
     private final NavigationBarController mNavBarController;
     private final NavigationBarView mNavigationBarView;
 
@@ -63,7 +78,7 @@ public class DeadZone {
     private final Runnable mDebugFlash = new Runnable() {
         @Override
         public void run() {
-            ObjectAnimator.ofFloat(DeadZone.this, "flash", 1f, 0f).setDuration(150).start();
+            ObjectAnimator.ofFloat(DeadZone.this, FLASH_PROPERTY, 1f, 0f).setDuration(150).start();
         }
     };