項目的功能很簡單,單純的播放視訊,沒有進度條,暫停鍵等,隻有一個關閉按鈕,當播放視訊時切換到背景暫停播放,恢複到前台後接着原來的進度播放。
1.用MediaPlayer播放視訊,調用MediaPlayer.start(),surfaceHolder還沒初始化好,debug時訓示錯誤的地方在
MediaPlayer.setDisplay(surfaceHolder)。
解決方法是把setDisplay()和start()放在surfaceCreated(SurfaceHolder holder)中,注意一定要setDisplay在start之前。
2.程式切換到背景再恢複播放,有聲音沒畫面。
原因方式是當Activity進入onPause狀态之後,SurfaceView會被銷毀,進而回調surfaceDestroyed()方法,當程式從背景恢複到前台是,SurfaceView并沒有重新建立,是以就出現隻有聲音沒有畫面的情況。
針對以上兩種情況,完整的視訊播放代碼如下所示:
public class VideoPlayActivity extends BaseActivity implements SurfaceHolder.Callback {
private MediaPlayer mMediaPlayer = null;
private SurfaceHolder mSurfaceHolder;
@BindView(R.id.video_play)
SurfaceView mVideoPlay;
@BindView(R.id.video_close)
ImageView mVideoClose;
private String videoPath = "";
private int currentPosition = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video_play);
ButterKnife.bind(this);
Intent intent = getIntent();
videoPath = intent.getStringExtra("videoPath");
mSurfaceHolder = mVideoPlay.getHolder();
mSurfaceHolder.addCallback(this);
mMediaPlayer = new MediaPlayer();
}
@OnClick(R.id.video_close)
public void onViewClicked() {
if(mMediaPlayer != null){
finish();
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if(mMediaPlayer != null){
finish();
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mMediaPlayer.setDisplay(mSurfaceHolder); //設定顯示視訊顯示在SurfaceView上
play(currentPosition);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if(mMediaPlayer != null && mMediaPlayer.isPlaying()){
currentPosition = mMediaPlayer.getCurrentPosition();
mMediaPlayer.stop();
}
}
private void play(int msec){
try {
mMediaPlayer.reset();
mMediaPlayer.setDataSource(videoPath);
mMediaPlayer.prepare();
mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mMediaPlayer.start();
mMediaPlayer.seekTo(msec);
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
}
備注:
播放視訊時,SurfaceView區域視覺上會黑屏一會兒,可以用
SurfaceView的setZOrderOnTop(true);解決
懸浮最上層後可能會遮擋其他的View,可以用
SurfaceView的setZOrderMediaOverlay(true);解決