tests/UiBench/src/com/android/test/uibench/TrivialAnimationActivity.java

/*
 * Copyright (C) 2015 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.test.uibench;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

public class TrivialAnimationActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setBackgroundDrawable(new ColorDrawable() {
            int colorValue = 0;
            int colorDelta = 1;

            @Override
            public void draw(Canvas canvas) {
                colorValue += colorDelta;
                if (colorValue == 255 || colorValue == 0) {
                    colorDelta *= -1;
                }

                setColor(Color.rgb(255, colorValue, 255 - colorValue));
                invalidateSelf();
                super.draw(canvas);
            }
        });
    }
}