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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.test.hwui;
     18 
     19 import android.app.Activity;
     20 import android.graphics.Canvas;
     21 import android.graphics.Paint;
     22 import android.graphics.PorterDuff;
     23 import android.graphics.SurfaceTexture;
     24 import android.os.Bundle;
     25 import android.view.Gravity;
     26 import android.view.TextureView;
     27 import android.widget.FrameLayout;
     28 
     29 @SuppressWarnings({"UnusedDeclaration"})
     30 public class CanvasTextureViewActivity extends Activity
     31         implements TextureView.SurfaceTextureListener {
     32     private TextureView mTextureView;
     33     private CanvasTextureViewActivity.RenderingThread mThread;
     34 
     35     @Override
     36     protected void onCreate(Bundle savedInstanceState) {
     37         super.onCreate(savedInstanceState);
     38 
     39         FrameLayout content = new FrameLayout(this);
     40 
     41         mTextureView = new TextureView(this);
     42         mTextureView.setSurfaceTextureListener(this);
     43         mTextureView.setOpaque(false);
     44 
     45         content.addView(mTextureView, new FrameLayout.LayoutParams(500, 500, Gravity.CENTER));
     46         setContentView(content);
     47     }
     48 
     49     @Override
     50     public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
     51         mThread = new RenderingThread(mTextureView);
     52         mThread.start();
     53     }
     54 
     55     @Override
     56     public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
     57         // Ignored
     58     }
     59 
     60     @Override
     61     public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
     62         if (mThread != null) mThread.stopRendering();
     63         return true;
     64     }
     65 
     66     @Override
     67     public void onSurfaceTextureUpdated(SurfaceTexture surface) {
     68         // Ignored
     69     }
     70 
     71     private static class RenderingThread extends Thread {
     72         private final TextureView mSurface;
     73         private volatile boolean mRunning = true;
     74 
     75         public RenderingThread(TextureView surface) {
     76             mSurface = surface;
     77         }
     78 
     79         @Override
     80         public void run() {
     81             float x = 0.0f;
     82             float y = 0.0f;
     83             float speedX = 5.0f;
     84             float speedY = 3.0f;
     85 
     86             Paint paint = new Paint();
     87             paint.setColor(0xff00ff00);
     88 
     89             while (mRunning && !Thread.interrupted()) {
     90                 final Canvas canvas = mSurface.lockCanvas(null);
     91                 try {
     92                     canvas.drawColor(0x00000000, PorterDuff.Mode.CLEAR);
     93                     canvas.drawRect(x, y, x + 20.0f, y + 20.0f, paint);
     94                 } finally {
     95                     mSurface.unlockCanvasAndPost(canvas);
     96                 }
     97 
     98                 if (x + 20.0f + speedX >= mSurface.getWidth() || x + speedX <= 0.0f) {
     99                     speedX = -speedX;
    100                 }
    101                 if (y + 20.0f + speedY >= mSurface.getHeight() || y + speedY <= 0.0f) {
    102                     speedY = -speedY;
    103                 }
    104 
    105                 x += speedX;
    106                 y += speedY;
    107 
    108                 try {
    109                     Thread.sleep(15);
    110                 } catch (InterruptedException e) {
    111                     // Interrupted
    112                 }
    113             }
    114         }
    115 
    116         void stopRendering() {
    117             interrupt();
    118             mRunning = false;
    119         }
    120     }
    121 }
    122