android 下的一段视屏播放的逻辑

浏览数：19 / 时间：2015年06月11日

android 下的一段视屏播放的逻辑只是Activity的一部分逻辑源码

DemoActivity:

public class DemoActivity extends Activity implements OnClickListener {

   EditText et_path;
   Button bt_start;
   Button bt_pause;
   Button bt_restart;
   Button bt_stop;
   SurfaceView sv;
   SurfaceHolder holder;
   MediaPlayer player;

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

       et_path = (EditText) this.findViewById(R.id.et_path);
       bt_start = (Button) this.findViewById(R.id.bt_start);
       bt_pause = (Button) this.findViewById(R.id.bt_pause);
       bt_restart = (Button) this.findViewById(R.id.bt_restart);
       bt_stop = (Button) this.findViewById(R.id.bt_stop);
       sv = (SurfaceView) this.findViewById(R.id.sv);

       bt_start.setOnClickListener(this);
       bt_pause.setOnClickListener(this);
       bt_restart.setOnClickListener(this);
       bt_stop.setOnClickListener(this);

       holder = sv.getHolder();

       // 设置缓冲区的内容向holder推送的方式
       holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
       holder.addCallback(new MyHolderCallback());

   }

   /**
   * surface的声明周期
   * @author Administrator
   *
   */
   private class MyHolderCallback implements SurfaceHolder.Callback{

       @Override
       public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,
               int arg3) {
           // TODO Auto-generated method stub

       }

       @Override
       public void surfaceCreated(SurfaceHolder arg0) {
           // TODO Auto-generated method stub

       }

       @Override
       public void surfaceDestroyed(SurfaceHolder arg0) {
           // TODO Auto-generated method stub

       }

   }

   @Override
   public void onClick(View v) {
       String path = et_path.getText().toString().trim();

       switch(v.getId()){
       case R.id.bt_start:
           player = new MediaPlayer();
           player.setAudioStreamType(AudioManager.STREAM_MUSIC);
           player.setDisplay(holder);
           if("".equals(path)){//如果输入的链接为空的话
               Toast.makeText(this, "文件为空，请输入文件的链接", Toast.LENGTH_SHORT).show();
               return;
           }
           try {
               player.setDataSource(path);
               player.prepare();
           } catch (Exception e) {
               Toast.makeText(this, "文件访问出错", Toast.LENGTH_SHORT).show();
               e.printStackTrace();
           }

           player.setOnCompletionListener(new OnCompletionListener(){//当媒体播放是否完成的监听器

               @Override
               public void onCompletion(MediaPlayer mp) {
                   Toast.makeText(DemoActivity.this, "播放完成", 0).show();
                   player.release();//播放完成的时候，要释放资源
                   player = null;
                   bt_start.setEnabled(true);
               }

           });

           player.setOnErrorListener(new OnErrorListener(){

               @Override
               public boolean onError(MediaPlayer mp, int what, int extra) {
                   Toast.makeText(DemoActivity.this, "播放完成出现错误", 0).show();
                   player.release();//出现错误的时候要释放资源
                   player = null;
                   bt_start.setEnabled(true);
                   return false;
               }

           });

           player.start();

           bt_start.setEnabled(false);
           break;
       case R.id.bt_pause:
           if(player != null && player.isPlaying()){//如果媒体正在播放的话
               player.pause();
               bt_pause.setText(">>");
               return;
           }

           if(player != null && ">>".equals(bt_pause.getText())){
               player.start();
               bt_pause.setText("||");
               return;
           }
           break;
       case R.id.bt_restart:

           if(player != null && player.isPlaying()){//媒体正在播放的话
               player.seekTo(0);
           }else{
               Toast.makeText(DemoActivity.this,"需要重新博凡", Toast.LENGTH_SHORT).show();
           }

           break;
       case R.id.bt_stop:
           if(player != null && player.isPlaying()){//媒体正在播放的话
               player.stop();//如果是停止播放一段媒体的话，肯定是要先停止，然后再释放资源
               player.release();
               player = null;
               bt_start.setEnabled(true);//设置开始按钮为可点击

           } else{
               player.release();
               player = null;
               bt_start.setEnabled(true);//设置开始按钮为可点击
               bt_start.setClickable(true);
           }
           break;
       }

   }
}