android--(surfaceView实现视频播放、9.path工具使用)

public class MyVioce extends AppCompatActivity implements SurfaceHolder.Callback {

private SurfaceView surfaceView;

private SurfaceHolder holder;

private MediaPlayer mediaPlayer;//播放器

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

        surfaceView = (SurfaceView) findViewById(R.id.surfaceView);

//surfaceHolder是 surfaceView的控制接口
        holder = surfaceView.getHolder();

        holder.addCallback(this);

        holder.setFixedSize(320, 220);//显示的分辨率
    }


public void play(View view) {
        mediaPlayer.start();
    }

public void pause(View view) {
        mediaPlayer.pause();
    }

public void stop(View view) {
        mediaPlayer.stop();
    }


/************
 * 回调方法
 ********************/
@Override
public void surfaceCreated(SurfaceHolder holder) {
//创建播放器对象
        mediaPlayer = new MediaPlayer();

//设置声音流
        mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
//设置显示
        mediaPlayer.setDisplay(holder);

        String path =
                Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES) + "/2.mp4";

try {
//设置播放视频 的资源
            mediaPlayer.setDataSource(path);
//准备
            mediaPlayer.prepare();


        } catch (IOException e) {
            e.printStackTrace();
        }


    }

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

    }

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (mediaPlayer != null) {
/**
 * 如果正在播放 ,则停止播放，并释放资源
 */
if (mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
                mediaPlayer.release();
            }
        }

    }


//退出是释放资源
@Override
protected void onDestroy() {
super.onDestroy();
if (mediaPlayer != null) {
/**
 * 如果正在播放 ,则停止播放，并释放资源
 */
if (mediaPlayer.isPlaying()) {
                mediaPlayer.stop();
                mediaPlayer.release();
            }
        }
    }
}