本文利用SurfaceView来实现视频的播放
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在main.xml布局文件添加用于视频画面绘制的SurfaceView 控件：
项目布局设计：
大部分代码和《》中的完全一样，修改一点点代码即可：
public class MainActivity extends Activity implements OnClickListener { private EditText et_path; private Button bt_play, bt_replay, bt_pause, bt_stop; private SurfaceView sv; private MediaPlayer mediaPlayer; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sv = (SurfaceView)findViewById(R.id.sv); et_path = (EditText) findViewById(R.id.et_path); bt_play = (Button) findViewById(R.id.bt_play); bt_replay = (Button) findViewById(R.id.bt_replay); bt_pause = (Button) findViewById(R.id.bt_pause); bt_stop = (Button) findViewById(R.id.bt_stop); bt_pause.setOnClickListener(this); bt_play.setOnClickListener(this); bt_replay.setOnClickListener(this); bt_stop.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.bt_play: play(); break; case R.id.bt_replay: replay(); break; case R.id.bt_stop: stop(); break; case R.id.bt_pause: pause(); break; default: break; } } /** * 暂停音乐 */ private void pause() { if ("继续".equals(bt_pause.getText().toString().trim())) { mediaPlayer.start(); bt_pause.setText("暂停"); return; } if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); bt_pause.setText("继续"); return; } } /** * 重新播放 */ private void replay() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.seekTo(0); return; } play(); } /** * 停止播放音乐 */ private void stop() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.stop(); mediaPlayer.release(); // 记得释放资源 mediaPlayer = null; bt_play.setEnabled(true); } } /** * 播放音乐 */ private void play() { String path = et_path.getText().toString().trim(); File file = new File(path); if (file.exists() && file.length() > 0) { try { mediaPlayer = new MediaPlayer(); mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); /* 设置Video影片以SurfaceHolder播放 */ mediaPlayer.setDisplay(sv.getHolder()); mediaPlayer.setDataSource(path); mediaPlayer.prepare(); // might take long! (for buffering, etc) mediaPlayer.start(); mediaPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { bt_play.setEnabled(true); } } ); bt_play.setEnabled(false); } catch (Exception e) { Toast.makeText(this, "播放失败", 0).show(); e.printStackTrace(); } } else { Toast.makeText(this, "文件不存在", 0).show(); } }} 运行项目效果如下：
但是上面的代码有点问题，那就是当点击home或返回屏幕主界面后，在回到播放页面，视频黑屏
原因：
SurfaceView内部维护双缓冲，消耗内存资源
如果发现当前SurfaceView 用户可见的时候，创建SurfaceView的holder
如果SurfaceView变成用户不可见的时候 销毁SurfaceView的holder
为了观察SurfaceView的生命周期，可以添加下面的代码进行打印追踪：
sv.getHolder().addCallback(new Callback() { @Override public void surfaceDestroyed(SurfaceHolder holder) { System.out.println("holder被销毁了"); } @Override public void surfaceCreated(SurfaceHolder holder) { System.out.println("holder被创建了"); } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { System.out.println("holder的大小变化了"); } }); } logcat中打印下面的信息：
09-07 11:36:34.613: I/System.out(28858): holder被创建了
09-07 11:36:34.623: I/System.out(28858): holder的大小变化了返回主界面
09-07 11:39:08.245: I/System.out(28858): holder被销毁了
再次回到视频界面
09-07 11:39:39.405: I/System.out(28858): holder被创建了
09-07 11:39:39.405: I/System.out(28858): holder的大小变化了可以看到，每次回到视频界面，holder都会被重新创建
修改后的代码如下：
public class MainActivity extends Activity implements OnClickListener { private EditText et_path; private Button bt_play, bt_replay, bt_pause, bt_stop; private SurfaceView sv; private MediaPlayer mediaPlayer; private int currentPosition; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); sv = (SurfaceView) findViewById(R.id.sv); et_path = (EditText) findViewById(R.id.et_path); bt_play = (Button) findViewById(R.id.bt_play); bt_replay = (Button) findViewById(R.id.bt_replay); bt_pause = (Button) findViewById(R.id.bt_pause); bt_stop = (Button) findViewById(R.id.bt_stop); bt_pause.setOnClickListener(this); bt_play.setOnClickListener(this); bt_replay.setOnClickListener(this); bt_stop.setOnClickListener(this); sv.getHolder().addCallback(new Callback() { @Override public void surfaceDestroyed(SurfaceHolder holder) { System.out.println("holder被销毁了"); if (mediaPlayer != null && mediaPlayer.isPlaying()) { currentPosition = mediaPlayer.getCurrentPosition(); stop(); } } @Override public void surfaceCreated(SurfaceHolder holder) { System.out.println("holder被创建了"); if (currentPosition > 0) { play(currentPosition); } } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { System.out.println("holder的大小变化了"); } }); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.bt_play: play(0); break; case R.id.bt_replay: replay(); break; case R.id.bt_stop: stop(); break; case R.id.bt_pause: pause(); break; default: break; } } /** * 暂停音乐 */ private void pause() { if ("继续".equals(bt_pause.getText().toString().trim())) { mediaPlayer.start(); bt_pause.setText("暂停"); return; } if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); bt_pause.setText("继续"); return; } } /** * 重新播放 */ private void replay() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.seekTo(0); return; } play(0); } /** * 停止播放音乐 */ private void stop() { if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.stop(); mediaPlayer.release(); // 记得释放资源 mediaPlayer = null; bt_play.setEnabled(true); } } /** * 播放音乐 */ private void play(final int currentPosition) { String path = et_path.getText().toString().trim(); File file = new File(path); if (file.exists() && file.length() > 0) { try { mediaPlayer = new MediaPlayer(); mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); /* 设置Video影片以SurfaceHolder播放 */ mediaPlayer.setDisplay(sv.getHolder()); mediaPlayer.setDataSource(path); mediaPlayer.prepare(); // might take long! (for buffering, etc) mediaPlayer.start(); mediaPlayer.setOnPreparedListener(new OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { mediaPlayer.seekTo(currentPosition); } }); mediaPlayer.setOnCompletionListener(new OnCompletionListener() { @Override public void onCompletion(MediaPlayer mp) { bt_play.setEnabled(true); } }); bt_play.setEnabled(false); } catch (Exception e) { Toast.makeText(this, "播放失败", 0).show(); e.printStackTrace(); } } else { Toast.makeText(this, "文件不存在", 0).show(); } }}