我正在研究这个非常简单的应用程序，该应用程序在循环播放视频并附加了countDowntimer。 基本上我所拥有的是以下内容：
然后在countdownTimer的onFinish()我等了几秒钟，然后开始这样的新活动：
public void openCompletedWorkout() {
handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
final Intent mainIntent = new Intent(getActivity(), CompletedWorkoutActivity.class);
getActivity().startActivity(mainIntent);
getActivity().finish();
}
}, 5000);
}
在onFinish()方法（CoundDownTimer）中调用上述方法。
问题是如果用户不想让videoPlayer循环，一切正常，这意味着，onFinish()函数调用OpenCompletedWorkout()方法而不会崩溃（活动打开没有问题）。但是，当用户要么说他们想让视频循环播放1x或2x时，当需要拨打onFinish()时，应用会崩溃。
我不知道出了什么问题。我一直试图解决这个问题，过去4小时仍然存在很多问题。
只是为了把事情放在眼里，下面是我的fragmentActivity，其中一切都在发生：
public class PlayVideoFragment extends Fragment implements View.OnClickListener {
private static final String VIDEO_PATH = "android.resource://";
TextView screenTitle;
TextView textTitle;
String myTime;
String myPlan;
private ImageButton pauseButton;
private ImageButton playButton;
private VideoView videoPlayer;
private MediaController mc;
private TextView counter;
private MediaPlayer soundPlayer;
private int mRepeats;
String output;
MyCounter downCounter;
int length;
long leftTime;
long seconds;
Handler handler;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedStateInstance) {
View v = inflater.inflate(R.layout.play_video_container, container,
false);
pauseButton = (ImageButton) v.findViewById(R.id.pauseButton);
pauseButton.setOnClickListener(this);
playButton = (ImageButton) v.findViewById(R.id.playButton);
playButton.setOnClickListener(this);
counter = (TextView) v.findViewById(R.id.counter);
Bundle bundle = getArguments();
if (bundle != null) {
myTime = bundle.getString("time");
myPlan = bundle.getString("plan");
}
videoPlayer = (VideoView) v.findViewById(R.id.videoPlayer);
if (myPlan.equals("intense")) {
if (myTime.equals("fiveMin")) {
playVideoTimed(R.raw.abs_workout_one, myTime.toString(), 0);
} else if (myTime.equals("tenMin")) {
playVideoTimed(R.raw.abs_workout_one, myTime.toString(), 1);
// Toast.makeText(getActivity(), "LOOOP ONCE!!",
// Toast.LENGTH_LONG).show();
} else if (myTime.equals("fifteenMin")) {
playVideoTimed(R.raw.abs_workout_one, myTime.toString(), 2);
}
// playVideo(R.raw.abs_workout_one, myTime.toString());
} else if (myPlan.equals("extreme")) {
if (myTime.equals("fiveMin")) {
playVideoTimed(R.raw.abs_workout_two, myTime.toString(), 0);
} else if (myTime.equals("tenMin")) {
playVideoTimed(R.raw.abs_workout_two, myTime.toString(), 1);
} else if (myTime.equals("fifteenMin")) {
playVideoTimed(R.raw.abs_workout_two, myTime.toString(), 2);
}
// playVideo(R.raw.abs_workout_two, myTime.toString());
} else if (myPlan.equals("insane")) {
if (myTime.equals("fiveMin")) {
playVideoTimed(R.raw.abs_workout_three, myTime.toString(), 0);
} else if (myTime.equals("tenMin")) {
playVideoTimed(R.raw.abs_workout_three, myTime.toString(), 1);
} else if (myTime.equals("fifteenMin")) {
playVideoTimed(R.raw.abs_workout_three, myTime.toString(), 2);
}
// playVideo(R.raw.abs_workout_three, myTime.toString());
}
return v;
}
public void playVideoTimed(int videoPath, String mins, int repeats) {
long timeElapsed = 0;
if (mins.equals("fiveMin")) {
repeats = 0;
mRepeats = 0;
timeElapsed = 300000;
} else if (mins.equals("tenMin")) {
repeats = 1;
mRepeats = 1;
timeElapsed = 600000;
} else if (mins.equals("fifteenMin")) {
repeats = 2;
mRepeats = 2;
timeElapsed = 900000;
}
downCounter = new MyCounter(timeElapsed, 1000);
downCounter.start();
Uri uri = Uri.parse(VIDEO_PATH + getActivity().getPackageName() + "/"
+ videoPath);
mc = new MediaController(getActivity());
videoPlayer.setMediaController(null); // used to be mc being passed to
// show controls
videoPlayer.setVideoURI(uri);
videoPlayer.requestFocus();
videoPlayer.start();
videoPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
if (mRepeats == 1) {
mp.setLooping(false);
mp.seekTo(0);
mp.start();
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp.setLooping(false);
//mp.seekTo(0);
//mp.stop();
try{
mp.stop();
mp.reset();
mp.release();
mp = null;
}catch(IllegalStateException e) {
e.printStackTrace();
}
}
});
} // end if
else if (mRepeats == 2) {
mp.seekTo(0);
mp.start();
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
try{
mp.setLooping(false);
mp.seekTo(0);
mp.start();
}catch (IllegalStateException e) {
e.printStackTrace();
}
mp.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
try{
mp.setLooping(false);
mp.stop();
mp.reset();
mp.release();
mp = null;
}catch (IllegalStateException e) {
e.printStackTrace();
}
}
});
}
});
}// end final IF
} // END FUNCTION
});
}
public void playVideo(int videoPath, String mins) {
long timeElapsed = 0;
if (mins.equals("fiveMin")) {
timeElapsed = 300000;
} else if (mins.equals("tenMin")) {
timeElapsed = 600000;
} else if (mins.equals("fifteenMin")) {
timeElapsed = 900000;
}
downCounter = new MyCounter(timeElapsed, 1000);
downCounter.start();
Uri uri = Uri.parse(VIDEO_PATH + getActivity().getPackageName() + "/"
+ videoPath);
mc = new MediaController(getActivity());
videoPlayer.setMediaController(null); // used to be mc being passed to
// show controls
videoPlayer.setVideoURI(uri);
videoPlayer.requestFocus();
videoPlayer.start();
}
public void playDoneSound() {
soundPlayer = MediaPlayer.create(getActivity(),
R.raw.well_done_workout_completed);
soundPlayer.start();
}
public void killSounds() {
if (soundPlayer != null) {
soundPlayer.stop();
soundPlayer.release();
}
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.pauseButton:
videoPlayer.pause();
playButton.setVisibility(View.VISIBLE);
pauseButton.setVisibility(View.INVISIBLE);
downCounter.cancel();
break;
case R.id.playButton:
videoPlayer.seekTo(videoPlayer.getCurrentPosition());
videoPlayer.start(); // little hack to get the video to play from
// where it stopped
pauseButton.setVisibility(View.VISIBLE);
playButton.setVisibility(View.INVISIBLE);
downCounter = new MyCounter(leftTime, 1000);
downCounter.start();
// downCounter
break;
}
}
// inner class for our timer
/**
*
* @author http://stackoverflow.com/questions/16584328/track-each-minute-in-
* countdown-timer
*
*/
public String formatTime(long millis) {
output = "";
seconds = millis / 1000;
long minutes = seconds / 60;
long hours = minutes / 60;
seconds = seconds % 60;
minutes = minutes % 60;
hours = hours % 60;
String secondsD = String.valueOf(seconds);
String minutesD = String.valueOf(minutes);
String hoursD = String.valueOf(hours);
if (hours > 10)
secondsD = "0" + seconds;
if (minutes < 10)
minutesD = "0" + minutes;
if (hours < 10)
hoursD = "0" + hours;
if (seconds < 10)
secondsD = "0" + seconds;
// output = hoursD+" : " +minutesD + " : " + secondsD;
output = minutesD + " : " + secondsD;
return output;
}
public class MyCounter extends CountDownTimer {
Context mContext;
public MyCounter(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);
}
@Override
public void onFinish() {
counter.setText("Done!");
playDoneSound();
downCounter.cancel();
downCounter = null;
//if (mRepeats == 0) {
openCompletedWorkout();
//}
}
@Override
public void onTick(long millisUntilFinished) {
leftTime = millisUntilFinished;
counter.setText(formatTime(millisUntilFinished));
}
public void openCompletedWorkout() {
handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
final Intent mainIntent = new Intent(getActivity(), CompletedWorkoutActivity.class);
getActivity().startActivity(mainIntent);
getActivity().finish();
}
}, 5000);
}
}
}
这是logCat：
10-14 13:15:29.273: E/MediaPlayer(18712): [MediaPlayer.java:767:setDataSource()] setDataSource() uri: android.resource://com.pocketworkouts.armsworkout/213096857610-14 13:25:29.669: E/MediaPlayer(18712): [MediaPlayer.java:1198:release()] release() 10-14 13:25:34.874: W/dalvikvm(18712): threadid=1: thread exiting with uncaught exception (group=0x4001d560) 10-14 13:25:34.904: E/AndroidRuntime(18712): FATAL EXCEPTION: main 10-14 13:25:34.904: E/AndroidRuntime(18712): java.lang.IllegalStateException 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.media.MediaPlayer._reset(Native Method) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.media.MediaPlayer.reset(MediaPlayer.java:1228) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.widget.VideoView.release(VideoView.java:505) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.widget.VideoView.access$2100(VideoView.java:49) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.widget.VideoView$6.surfaceDestroyed(VideoView.java:495) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.SurfaceView.reportSurfaceDestroyed(SurfaceView.java:596) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.SurfaceView.updateWindow(SurfaceView.java:490) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.SurfaceView.onWindowVisibilityChanged(SurfaceView.java:215) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.View.dispatchWindowVisibilityChanged(View.java:4098) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:720) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:720) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:720) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:720) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.ViewGroup.dispatchWindowVisibilityChanged(ViewGroup.java:720) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.ViewRoot.performTraversals(ViewRoot.java:786) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.view.ViewRoot.handleMessage(ViewRoot.java:1863) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.os.Handler.dispatchMessage(Handler.java:99) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.os.Looper.loop(Looper.java:130) 10-14 13:25:34.904: E/AndroidRuntime(18712): at android.app.ActivityThread.main(ActivityThread.java:3683) 10-14 13:25:34.904: E/AndroidRuntime(18712): at java.lang.reflect.Method.invokeNative(Native Method) 10-14 13:25:34.904: E/AndroidRuntime(18712): at java.lang.reflect.Method.invoke(Method.java:507) 10-14 13:25:34.904: E/AndroidRuntime(18712): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:889) 10-14 13:25:34.904: E/AndroidRuntime(18712): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:647) 10-14 13:25:34.904: E/AndroidRuntime(18712): at dalvik.system.NativeStart.main(Native Method)
任何帮助都将受到高度赞赏。
感谢。