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下面是我正在使用的代碼。我正在使用vimeo視頻網址，它在第一次加載活動時工作正常，但在第二次調用活動時出現問題時顯示消息嘗試在無效媒體播放器上調用getDuration。getDuration正在拋出Attepmt來調用無效的媒體播放器當第二次調用媒體播放器時？
public class VideoActivity extends Activity {
public LinearLayout main_Lay;
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 = "androidEx2 = VideoSample";
public boolean isFullScreen = false;
private Context m_context;
public GestureDetector ggg;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.video_layout);
this.m_context = this;
main_Lay = (LinearLayout) findViewById(R.id.main_lay);
main_Lay.startAnimation(AnimationUtils.loadAnimation(this,
R.anim.slide_out_up));
surfaceViewFrame = (SurfaceView) findViewById(R.id.surfaceViewFrame);
final Button button = (Button) findViewById(R.id.full);
ggg = new GestureDetector(new OnGestureListener() {
public boolean onSingleTapUp(MotionEvent arg0) {
// TODO Auto-generated method stub
try {
if (player != null) {
if (player.isPlaying())
player.stop();
player.reset();
player.release();
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
}
} catch (Exception ex) {
ex.printStackTrace();
player.reset();
player.release();
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
}
return true;
}
public void onShowPress(MotionEvent arg0) {
// TODO Auto-generated method stub
}
public boolean onScroll(MotionEvent arg0, MotionEvent arg1,
float arg2, float arg3) {
// TODO Auto-generated method stub
return false;
}
public void onLongPress(MotionEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public boolean onFling(MotionEvent arg0, MotionEvent arg1,
float arg2, float arg3) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean onDown(MotionEvent arg0) {
// TODO Auto-generated method stub
return false;
}
});
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (player != null) {
if (!isFullScreen) {
isFullScreen = true;
button.setBackgroundResource(R.drawable.fullscreen_exit_alt);
// Get the width of the screen
int screenWidth = ((Activity) m_context)
.getWindowManager().getDefaultDisplay()
.getWidth();
int screenHeight = ((Activity) m_context)
.getWindowManager().getDefaultDisplay()
.getHeight();
WidthResizeAnimation zoom_out = new WidthResizeAnimation(
main_Lay, screenWidth, screenHeight, false);
zoom_out.setDuration(600);
zoom_out.setFillAfter(true);
WidthResizeAnimation zoom_outt = new WidthResizeAnimation(
surfaceViewFrame, screenWidth, screenHeight,
false);
zoom_outt.setDuration(600);
zoom_outt.setFillAfter(true);
surfaceViewFrame.startAnimation(zoom_outt);
main_Lay.startAnimation(zoom_out);
} else {
isFullScreen = false;
button.setBackgroundResource(R.drawable.fullscreen_alt);
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 = ((Activity) m_context)
.getWindowManager().getDefaultDisplay()
.getWidth();
int screenHeight = ((Activity) m_context)
.getWindowManager().getDefaultDisplay()
.getHeight();
float screenProportion = (float) screenWidth
/(float) screenHeight;
Log.i(TAG, "VIDEO SIZES: W: " + screenWidth + " H: "
+ screenHeight + " PROP: " + screenProportion);
// Get the SurfaceView layout
// parameters
android.view.ViewGroup.LayoutParams lp = surfaceViewFrame
.getLayoutParams();
android.view.ViewGroup.LayoutParams mainLayoutParam = main_Lay
.getLayoutParams();
if (videoProportion > screenProportion) {
lp.width = screenWidth;
lp.height = (int) ((float) screenWidth/videoProportion);
lp.width = (lp.width/100) * 80;
lp.height = (lp.height/100) * 80;
} else {
lp.width = (int) (videoProportion * (float) screenHeight);
lp.height = screenHeight;
lp.width = (lp.width/100) * 70;
lp.height = (lp.height/100) * 70;
}
WidthResizeAnimation zoom_in = new WidthResizeAnimation(
main_Lay, lp.width, lp.height, false);
zoom_in.setDuration(600);
zoom_in.setFillAfter(true);
// zoom_in.start();
WidthResizeAnimation zoom_inn = new WidthResizeAnimation(
surfaceViewFrame, lp.width, lp.height, false);
zoom_inn.setDuration(600);
zoom_inn.setFillAfter(true);
// zoom_in.start();
surfaceViewFrame.startAnimation(zoom_inn);
main_Lay.startAnimation(zoom_in);
}
}
}
});
final Button pause = (Button) findViewById(R.id.pause);
pause.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
if (player != null) {
if (player.isPlaying()) {
player.pause();
pause.setBackgroundResource(R.drawable.play);
imageViewPauseIndicator.setVisibility(View.GONE);
} else {
pause.setBackgroundResource(R.drawable.pause);
player.start();
imageViewPauseIndicator.setVisibility(View.GONE);
}
}
}
});
linearLayoutMediaController = (LinearLayout) findViewById(R.id.linearLayoutMediaController);
linearLayoutMediaController.setVisibility(View.GONE);
hideMediaController = AnimationUtils.loadAnimation(m_context,
R.anim.disapearing);
hideMediaController.setAnimationListener(new AnimationListener() {
@Override
public void onAnimationStart(Animation arg0) {
// TODO Auto-generated
// method stub
linearLayoutMediaController.setVisibility(View.GONE);
}
@Override
public void onAnimationRepeat(Animation arg0) {
// TODO Auto-generated
// method stub
}
@Override
public void onAnimationEnd(Animation arg0) {
// TODO Auto-generated
// method stub
}
});
imageViewPauseIndicator = (ImageView) findViewById(R.id.imageViewPauseIndicator);
imageViewPauseIndicator.setVisibility(View.GONE);
if (player != null) {
if (!player.isPlaying()) {
imageViewPauseIndicator.setVisibility(View.GONE);
}
}
textViewPlayed = (TextView) findViewById(R.id.textViewPlayed);
textViewLength = (TextView) findViewById(R.id.textViewLength);
surfaceViewFrame.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated
// method stub
if (arg0.getId() == R.id.surfaceViewFrame) {
if (linearLayoutMediaController.getVisibility() == View.GONE) {
linearLayoutMediaController.setVisibility(View.VISIBLE);
hideMediaController();
}
}
}
});
surfaceViewFrame.setClickable(false);
seekBarProgress = (SeekBar) findViewById(R.id.seekBarProgress);
seekBarProgress
.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar arg0) {
// TODO Auto-generated
// method stub
if (player.isPlaying()) {
progressBarWait.setVisibility(View.VISIBLE);
player.seekTo(arg0.getProgress() * 1000);
Log.i(TAG,
"========== SeekTo : " + arg0.getProgress());
}
}
@Override
public void onStartTrackingTouch(SeekBar arg0) {
// TODO Auto-generated
// method stub
}
@Override
public void onProgressChanged(SeekBar seekBar,
int progress, boolean fromUser) {
Log.i(TAG, "========== onProgressChanged : " + progress
+ " from user: " + fromUser);
if (!fromUser) {
textViewPlayed
.setText(durationInSecondsToString(progress));
}
}
});
seekBarProgress.setProgress(0);
progressBarWait = (ProgressBar) findViewById(R.id.progressBarWait);
holder = surfaceViewFrame.getHolder();
holder.addCallback(new Callback() {
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
player.setDisplay(holder);
playVideo();
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub
}
});
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
player = new MediaPlayer();
player.setOnPreparedListener(new OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer arg0) {
// TODO Auto-generated method stub
Log.i(TAG, "========== onPrepared ===========");
try {
int duration = player.getDuration()/1000; // duration
// in
// seconds
seekBarProgress.setMax(duration);
textViewLength.setText(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);
player.setVideoScalingMode(MediaPlayer.VIDEO_SCALING_MODE_SCALE_TO_FIT_WITH_CROPPING);
// Get the width of the screen
int screenWidth = ((Activity) m_context).getWindowManager()
.getDefaultDisplay().getWidth();
int screenHeight = ((Activity) m_context)
.getWindowManager().getDefaultDisplay().getHeight();
float screenProportion = (float) screenWidth
/(float) screenHeight;
Log.i(TAG, "VIDEO SIZES: W: " + screenWidth + " H: "
+ screenHeight + " PROP: " + screenProportion);
// Get the SurfaceView layout
// parameters
android.view.ViewGroup.LayoutParams lp = surfaceViewFrame
.getLayoutParams();
android.view.ViewGroup.LayoutParams mainLayoutParam = main_Lay
.getLayoutParams();
if (videoProportion > screenProportion) {
lp.width = screenWidth;
lp.height = (int) ((float) screenWidth/videoProportion);
lp.width = (lp.width/100) * 80;
lp.height = (lp.height/100) * 80;
} else {
lp.width = (int) (videoProportion * (float) screenHeight);
lp.height = screenHeight;
lp.width = (lp.width/100) * 90;
lp.height = (lp.height/100) * 90;
}
// Commit the layout parameters
surfaceViewFrame.setLayoutParams(lp);
RelativeLayout.LayoutParams rr = new RelativeLayout.LayoutParams(
lp.width, lp.height);
rr.addRule(RelativeLayout.CENTER_IN_PARENT);
main_Lay.setLayoutParams(rr);
// Start video
if (!player.isPlaying()) {
player.start();
updateMediaProgress();
linearLayoutMediaController.setVisibility(View.VISIBLE);
hideMediaController();
}
surfaceViewFrame.setClickable(true);
} catch (Exception ex) {
player.release();
finish();
ex.printStackTrace();
}
;
}
});
player.setOnErrorListener(new OnErrorListener() {
@Override
public boolean onError(MediaPlayer arg0, int arg1, int arg2) {
// TODO Auto-generated method stub
if (arg0.isPlaying()) {
arg0.stop();
}
arg0.release();
finish();
Log.e("Lrapp", "Error code" + arg1);
return true;
}
});
player.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg0) {
// TODO Auto-generated method stub
arg0.stop();
arg0.release();
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
}
});
player.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {
@Override
public void onBufferingUpdate(MediaPlayer arg0, int arg1) {
// TODO Auto-generated method stub
int progress = (int) ((float) arg0.getDuration() * ((float) arg1/(float) 100));
seekBarProgress.setSecondaryProgress(progress/1000);
}
});
player.setOnSeekCompleteListener(new OnSeekCompleteListener() {
@Override
public void onSeekComplete(MediaPlayer arg0) {
// TODO Auto-generated method stub
progressBarWait.setVisibility(View.GONE);
}
});
player.setScreenOnWhilePlaying(true);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
return ggg.onTouchEvent(event);
}
@Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
try {
if (player != null) {
if (player.isPlaying())
player.stop();
player.release();
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
}
} catch (Exception ex) {
ex.printStackTrace();
player.release();
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
}
}
private void playVideo() {
new Thread(new Runnable() {
public void run() {
try {
player.setDataSource("video url");
player.prepareAsync();
} catch (IllegalArgumentException e) {
showToast("Error while playing video. Please, check your network connection.");
Log.i(TAG,
"========== IllegalArgumentException ===========");
e.printStackTrace();
if (player.isPlaying())
player.stop();
player.release();
player = null;
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
} catch (IllegalStateException e) {
showToast("Error while playing video. Please, check your network connection.");
Log.i(TAG, "========== IllegalStateException ===========");
e.printStackTrace();
if (player.isPlaying())
player.stop();
player.release();
player = null;
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
} catch (IOException e) {
showToast("Error while playing video. Please, check your network connection.");
Log.i(TAG, "========== IOException ===========");
e.printStackTrace();
if (player.isPlaying())
player.stop();
player.release();
player = null;
if (updateTimer != null) {
updateTimer.cancel();
}
finish();
}
}
}).start();
}
private void showToast(final String string) {
((Activity) m_context).runOnUiThread(new Runnable() {
public void run() {
Toast.makeText(m_context, string, Toast.LENGTH_LONG).show();
;
}
});
}
private void hideMediaController() {
new Thread(new Runnable() {
public void run() {
try {
Thread.sleep(5000);
((Activity) m_context).runOnUiThread(new Runnable() {
public void run() {
linearLayoutMediaController
.startAnimation(hideMediaController);
}
});
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}
private void updateMediaProgress() {
updateTimer = new Timer("progress Updater");
updateTimer.scheduleAtFixedRate(new TimerTask() {
@Override
public void run() {
((Activity) m_context).runOnUiThread(new Runnable() {
public void run() {
try {
seekBarProgress.setProgress(player
.getCurrentPosition()/1000);
} catch (Exception ex) {
ex.printStackTrace();
player.release();
}
}
});
}
}, 0, 1000);
}
public static String durationInSecondsToString(int sec) {
int hours = sec/3600;
int minutes = (sec/60) - (hours * 60);
int seconds = sec - (hours * 3600) - (minutes * 60);
String formatted = String.format("%d:%02d:%02d", hours, minutes,
seconds);
return formatted;
}
}