Android开发之MediaPlayer和SurfaceView组成视频播放器

SurfaceView

使用双缓冲技术
是个重量级的组件
只要不可见，就不会创建，可见时，才会创建
只要不可见，就会销毁

SurfaceView一旦不可见，就会被销毁，一旦可见，就会被创建，销毁时停止播放，再次创建时再开始播放

 1 import android.app.Activity;
 2 import android.media.MediaPlayer;
 3 import android.os.Bundle;
 4 import android.view.SurfaceHolder;
 5 import android.view.SurfaceHolder.Callback;
 6 import android.view.SurfaceView;
 7 
 8 public class MainActivity extends Activity {
 9     private MediaPlayer player;
10     static int currentPosition;
11 
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main);
16 
17         SurfaceView sv = (SurfaceView) findViewById(R.id.sv);
18         // 拿到surfaceview的控制器
19         final SurfaceHolder sh = sv.getHolder();
20         //给SurfaceHolder设置CallBack，类似于侦听，可以知道SurfaceView的状态
21         sh.addCallback(new Callback() {
22             // surfaceView销毁时调用
23             @Override
24             public void surfaceDestroyed(SurfaceHolder holder) {
25                 // 每次surfaceview销毁时，同时停止播放视频
26                 if (player != null) {
27                     currentPosition = player.getCurrentPosition();
28                     player.stop();
29                     player.release();
30                     player = null;
31                 }
32             }
33 
34             // surfaceView创建时调用
35             @Override
36             public void surfaceCreated(SurfaceHolder holder) {
37                 // 每次surfaceView创建时才去播放视频
38                 if (player == null) {
39                     player = new MediaPlayer();
40                     player.reset();
41                     try {
42                         player.setDataSource("sdcard/2.3gp");
43                         player.setDisplay(sh);
44                         player.prepare();
45                         player.start();
46                         player.seekTo(currentPosition);
47                     } catch (Exception e) {
48                         e.printStackTrace();
49                     }
50                 }
51 
52             }
53 
54             // surfaceView结构改变时调用
55             @Override
56             public void surfaceChanged(SurfaceHolder holder, int format,
57                     int width, int height) {
58             }
59         });
60     }
61 }