我正在为视频流制作一个媒体播放器。它工作正常但是当我按下主页按钮时 Activity 再次进入后台我打开媒体播放器而不是从头开始它没有恢复。比如何在媒体播放器中恢复视频。这是我的代码

public class VideoSample extends Activity implements OnSeekBarChangeListener, Callback, OnPreparedListener, OnCompletionListener, OnBufferingUpdateListener,
    OnClickListener, OnSeekCompleteListener, AnimationListener {
private TextView textViewPlayed;
private TextView textViewLength;
private SeekBar seekBarProgress;
private SurfaceView surfaceViewFrame;
private ImageView imageViewPauseIndicator;
private MediaPlayer player;
private SurfaceHolder holder;
private ProgressBar progressBarWait;
private Timer updateTimer;
private Bundle extras;
private Animation hideMediaController;
private LinearLayout linearLayoutMediaController;
private static final String TAG = "log_tag";
private boolean b =false;
private int seekint,seeksec;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.customvideoview);
    extras = getIntent().getExtras();

    linearLayoutMediaController = (LinearLayout) findViewById(R.id.linearLayoutMediaController);
    linearLayoutMediaController.setVisibility(View.GONE);

    hideMediaController = AnimationUtils.loadAnimation(this, R.anim.disapearing);
    hideMediaController.setAnimationListener(this);

    imageViewPauseIndicator = (ImageView) findViewById(R.id.imageViewPauseIndicator);
    imageViewPauseIndicator.setVisibility(View.GONE);
    if (player != null) {
        if (!player.isPlaying()) {
            imageViewPauseIndicator.setVisibility(View.VISIBLE);
        }
    }

    textViewPlayed = (TextView) findViewById(R.id.textViewPlayed);
    textViewLength = (TextView) findViewById(R.id.textViewLength);

    surfaceViewFrame = (SurfaceView) findViewById(R.id.surfaceViewFrame);
    surfaceViewFrame.setOnClickListener(this);
    surfaceViewFrame.setClickable(false);

    seekBarProgress = (SeekBar) findViewById(R.id.seekBarProgress);
    seekBarProgress.setOnSeekBarChangeListener(this);
    seekBarProgress.setProgress(0);

    progressBarWait = (ProgressBar) findViewById(R.id.progressBarWait);

    holder = surfaceViewFrame.getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    player = new MediaPlayer();
    player.setOnPreparedListener(this);
    player.setOnCompletionListener(this);
    player.setOnBufferingUpdateListener(this);
    player.setOnSeekCompleteListener(this);
    player.setScreenOnWhilePlaying(true);
    player.setDisplay(holder);
}
@Override
protected void onDestroy() {
super.onDestroy();
        player.stop();
        player.release();
        player = null;
        Toast.makeText(VideoSample.this, "back",Toast.LENGTH_SHORT).show();
        finish();
}
private void playVideo() {
    if (extras.getString("video_path").equals("VIDEO_URI")) {
        showToast("Please, set the video URI in HelloAndroidActivity.java in onClick(View v) method");
    } else {
        new Thread(new Runnable() {
            public void run() {
                try {
                    player.setAudioStreamType(AudioManager.STREAM_MUSIC);
                    player.setDataSource(VideoSample.this, Uri.parse(extras.getString("video_path")));
                    //player.setVolume(0, 0);
                    player.setVolume(AudioManager.ADJUST_LOWER, AudioManager.ADJUST_RAISE);
                    //player.setAudioStreamType(AudioEncoder.DEFAULT);
                    player.prepareAsync();
                } catch (IllegalArgumentException e) {
                    showToast("Error while playing video");
                    e.printStackTrace();
                    Log.i(TAG,"tag"+ e.getMessage());
                } catch (IllegalStateException e) {
                    showToast("Error while playing video");
                    e.printStackTrace();
                    Log.i(TAG, "tag"+e.getMessage());
                } catch (IOException e) {
                    e.printStackTrace();
                    showToast("Error while playing video. Please, check your network connection.");
                    Log.i(TAG, "tag"+e.getLocalizedMessage());
                }
            }
        }).start();
    }
}

private void showToast(final String string) {
    runOnUiThread(new Runnable() {
        public void run() {
            Toast.makeText(VideoSample.this, string, Toast.LENGTH_LONG).show();
            finish();
        }
    });
}

private void hideMediaController() {
    new Thread(new Runnable() {
        public void run() {
            try {
                Thread.sleep(5000);
                runOnUiThread(new Runnable() {
                    public void run() {
                        linearLayoutMediaController.startAnimation(hideMediaController);
                    }
                });
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }).start();
}


public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
    Log.i(TAG, "========== onProgressChanged : " + progress + " from user: " + fromUser);
    if (!fromUser) {
        textViewPlayed.setText(Utils.durationInSecondsToString(progress));
    }
}

public void onStartTrackingTouch(SeekBar seekBar) {
}

public void onStopTrackingTouch(SeekBar seekBar) {
    if (player.isPlaying()) {
        progressBarWait.setVisibility(View.VISIBLE);
        player.seekTo(seekBar.getProgress() * 1000);
        Log.i(TAG, "========== SeekTo : " + seekBar.getProgress());
    }
}

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

}

public void surfaceCreated(SurfaceHolder holder) {
    playVideo();
}

public void surfaceDestroyed(SurfaceHolder holder) {

}

public void onPrepared(MediaPlayer mp) {
    if (!player.isPlaying()) {
        b = true;
        player.start();

        updateMediaProgress();
        linearLayoutMediaController.setVisibility(View.VISIBLE);
        hideMediaController();
    }
    Log.i(TAG, "========== onPrepared ===========");
    int duration = mp.getDuration() / 1000; // duration in seconds
    seekBarProgress.setMax(duration);
    textViewLength.setText(Utils.durationInSecondsToString(duration));
    progressBarWait.setVisibility(View.GONE);

    // Get the dimensions of the video
    int videoWidth = player.getVideoWidth();
    int videoHeight = player.getVideoHeight();
    float videoProportion = (float) videoWidth / (float) videoHeight;
    Log.i(TAG, "VIDEO SIZES: W: " + videoWidth + " H: " + videoHeight + " PROP: " + videoProportion);

    // Get the width of the screen
    int screenWidth = getWindowManager().getDefaultDisplay().getWidth();
    int screenHeight = getWindowManager().getDefaultDisplay().getHeight();
    float screenProportion = (float) screenWidth / (float) screenHeight;
    Log.i(TAG, "VIDEO SIZES: W: " + screenWidth + " H: " + screenHeight + " PROP: " + screenProportion);


    android.view.ViewGroup.LayoutParams lp = surfaceViewFrame.getLayoutParams();

    if (videoProportion > screenProportion) {
        lp.width = screenWidth;
        lp.height = (int) ((float) screenWidth / videoProportion);
    } else {
        lp.width = (int) (videoProportion * (float) screenHeight);
        lp.height = screenHeight;
    }


    surfaceViewFrame.setLayoutParams(lp);


    surfaceViewFrame.setClickable(true);
}

public void onCompletion(MediaPlayer mp) {
    mp.stop();
    if (updateTimer != null) {
        updateTimer.cancel();
    }
    finish();
}


private void updateMediaProgress() {
    updateTimer = new Timer("progress Updater");
    updateTimer.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            runOnUiThread(new Runnable() {
                public void run() {
                    if(player != null){
                    int position = player.getCurrentPosition();
                    seekBarProgress.setProgress(position / 1000);
                    }
                }
            });
        }
    }, 0, 1000);
}

public void onBufferingUpdate(MediaPlayer mp, int percent) {
    Log.v("log_tag","buffer"+mp.getDuration()*percent/100);
    if(b){
    int progress = (int) ((float) mp.getDuration() * ((float) percent / (float) 100));
    seekBarProgress.setSecondaryProgress(progress / 1000);
    }
}

public void onClick(View v) {
    if (v.getId() == R.id.surfaceViewFrame) {
        if (linearLayoutMediaController.getVisibility() == View.GONE) {
            linearLayoutMediaController.setVisibility(View.VISIBLE);
            hideMediaController();
        } else if (player != null) {
            if (player.isPlaying()) {
                b = false;
                player.pause();
                imageViewPauseIndicator.setVisibility(View.VISIBLE);
            } else {
                b = true;
                player.start();
                imageViewPauseIndicator.setVisibility(View.GONE);
            }
        }
    }
}

public void onSeekComplete(MediaPlayer mp) {
    progressBarWait.setVisibility(View.GONE);
}

public void onAnimationEnd(Animation animation) {

}

public void onAnimationRepeat(Animation animation) {

}

public void onAnimationStart(Animation animation) {
    linearLayoutMediaController.setVisibility(View.GONE);
}

最佳答案

暂停我使用的媒体播放器:

Mediaplayer.pause();
media_length=Mediaplayer.getCurrentPosition();

为了让播放器从停止的位置恢复:

Mediaplayer.seekTo(length);
Mediaplayer.start();

在您的代码中 Mediaplayer.start(); 在设置搜索栏的位置后丢失。

关于android - 如何在 Android 中恢复 MediaPlayer？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14433482/