我正在制作一个用于视频流的媒体播放器。它工作正常，但是当我按下主页按钮时，活动再次进入后台，我打开媒体播放器，而不是从头开始，它没有恢复。而不是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);
}
}