视频播放（在线）

背景android:background="#FFFFFF"



使用surfaceview控件实现视频播放，但是接到电话在播放的时候只有声音无画面，因为surfaceview控件离开前台后会被摧毁，当activity重新回到前台的时候surfaceview又会被重建，但是在onResume()方法后，故onResume()中无法播放，可以通过监听对象，在surfaceview创建的回调方法中重新播放，保存position，再次播放用

onDestroy()方法中释放播放器对象。

path=filename实现在线播放

public class MainActivity extends Activity {
private EditText nameText;
private String path;
private MediaPlayer mediaPlayer;
private SurfaceView surfaceView;
private boolean pause;
private int position;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

mediaPlayer = new MediaPlayer();
nameText = (EditText) this.findViewById(R.id.filename);
surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView);
//把输送给surfaceView的视频画面，直接显示到屏幕上,不要维持它自身的缓冲区
surfaceView.getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
surfaceView.getHolder().setFixedSize(176, 144);  //设置分辨率
surfaceView.getHolder().setKeepScreenOn(true); //保持屏幕高亮，不锁屏
surfaceView.getHolder().addCallback(new SurfaceCallback());
}

private final class SurfaceCallback implements Callback{
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
public void surfaceCreated(SurfaceHolder holder) {
if(position>0 && path!=null){
play(position);
position = 0;
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
if(mediaPlayer.isPlaying()){
position = mediaPlayer.getCurrentPosition();
mediaPlayer.stop();
}
}
}

@Override
protected void onDestroy() {
mediaPlayer.release();
mediaPlayer = null;
super.onDestroy();
}

public void mediaplay(View v){
switch (v.getId()) {
case R.id.playbutton:
String filename = nameText.getText().toString();
if(filename.startsWith("http")){
path = filename;     //实现在线播放
play(0);
}else{
File file = new File(Environment.getExternalStorageDirectory(), filename);
if(file.exists()){
path = file.getAbsolutePath();
play(0);
}else{
path = null;
Toast.makeText(this, R.string.filenoexsit, 1).show();
}
}

break;

case R.id.pausebutton:
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();
pause = true;
}else{
if(pause){
mediaPlayer.start();
pause = false;
}
}
break;

case R.id.resetbutton:
if(mediaPlayer.isPlaying()){
mediaPlayer.seekTo(0);
}else{
if(path!=null){
play(0);
}
}
break;
case R.id.stopbutton:
if(mediaPlayer.isPlaying()){
mediaPlayer.stop();
}
break;
}
}

private void play(int position) {
try {
mediaPlayer.reset();
mediaPlayer.setDataSource(path);
mediaPlayer.setDisplay(surfaceView.getHolder());
mediaPlayer.prepare();//缓冲
mediaPlayer.setOnPreparedListener(new PrepareListener(position));
} catch (Exception e) {
e.printStackTrace();
}
}

private final class PrepareListener implements OnPreparedListener{
private int position;

public PrepareListener(int position) {
this.position = position;
}

public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();//播放视频
if(position>0) mediaPlayer.seekTo(position);
}
}
}