Add AnimatedVectorDrawable support for VideoPreference

- We are planning to use animation vector drawable to replace mp4
file to reduce apk size
- Add vectorAnimation attr in VideoPreference
- Delegate VideoPreference media control to AnimationController

Bug: 143270527
Test: manual, robolectric
Change-Id: Ia5859f928a9082085cdf715c762f964e1c99e003

src/com/android/settings/widget/VectorAnimationController.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2019 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 android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.view.TextureView;
+import android.view.View;
+
+import androidx.vectordrawable.graphics.drawable.Animatable2Compat;
+import androidx.vectordrawable.graphics.drawable.AnimatedVectorDrawableCompat;
+
+/**
+ * A {@link VideoPreference.AnimationController} containing a {@link
+ * AnimatedVectorDrawableCompat}. The controller is used by {@link VideoPreference}
+ * to display AnimatedVectorDrawable content.
+ */
+class VectorAnimationController implements VideoPreference.AnimationController {
+    private AnimatedVectorDrawableCompat mAnimatedVectorDrawableCompat;
+    private Drawable mPreviewDrawable;
+    private Animatable2Compat.AnimationCallback mAnimationCallback;
+
+    /**
+     * Called by a preference panel fragment to finish itself.
+     *
+     * @param context Application Context
+     * @param animationId An {@link android.graphics.drawable.AnimationDrawable} resource id
+     */
+    VectorAnimationController(Context context, int animationId) {
+        mAnimatedVectorDrawableCompat = AnimatedVectorDrawableCompat.create(context, animationId);
+        mAnimationCallback = new Animatable2Compat.AnimationCallback() {
+            @Override
+            public void onAnimationEnd(Drawable drawable) {
+                mAnimatedVectorDrawableCompat.start();
+            }
+        };
+    }
+
+    @Override
+    public int getVideoWidth() {
+        return mAnimatedVectorDrawableCompat.getIntrinsicWidth();
+    }
+
+    @Override
+    public int getVideoHeight() {
+        return mAnimatedVectorDrawableCompat.getIntrinsicHeight();
+    }
+
+    @Override
+    public void pause() {
+        mAnimatedVectorDrawableCompat.stop();
+    }
+
+    @Override
+    public void start() {
+        mAnimatedVectorDrawableCompat.start();
+    }
+
+    @Override
+    public boolean isPlaying() {
+        return mAnimatedVectorDrawableCompat.isRunning();
+    }
+
+    @Override
+    public int getDuration() {
+        // We can't get duration from AnimatedVectorDrawable, just return a non zero value.
+        return 5000;
+    }
+
+    @Override
+    public void attachView(TextureView video, View preview, View playButton) {
+        mPreviewDrawable = preview.getForeground();
+        video.setVisibility(View.GONE);
+        updateViewStates(preview, playButton);
+        preview.setOnClickListener(v -> updateViewStates(preview, playButton));
+    }
+
+    @Override
+    public void release() {
+        mAnimatedVectorDrawableCompat.stop();
+        mAnimatedVectorDrawableCompat.clearAnimationCallbacks();
+    }
+
+    private void updateViewStates(View imageView, View playButton) {
+        if (mAnimatedVectorDrawableCompat.isRunning()) {
+            mAnimatedVectorDrawableCompat.stop();
+            mAnimatedVectorDrawableCompat.clearAnimationCallbacks();
+            playButton.setVisibility(View.VISIBLE);
+            imageView.setForeground(mPreviewDrawable);
+        } else {
+            playButton.setVisibility(View.GONE);
+            imageView.setForeground(mAnimatedVectorDrawableCompat);
+            mAnimatedVectorDrawableCompat.start();
+            mAnimatedVectorDrawableCompat.registerAnimationCallback(mAnimationCallback);
+        }
+    }
+}