-1
Ich habe eine Musikstream-App erstellt, die die Daten aus der Firebase holt. Aber Problem ist, dass, wenn ich ein Lied spiele und zur Hauptaktivität gehe, dann App hat Nachricht angehalten wurde, Anzeige und APP nah kommen. Wenn ich einen Song aus der Liste "View" (Ansicht) und "Back" (Zurück) abspiele, wird die App gestoppt. Was ich tun kann, bitte sag es mir. meinen CodeMeine App wurde gestoppt, als ich zurück gehe
public class ViewUploadsActivity extends AppCompatActivity implements MediaPlayer.OnBufferingUpdateListener,View.OnTouchListener
,MediaPlayer.OnCompletionListener{
//the listview
ListView listView;
private SeekBar seekBarProgress;
private int mediaFileLengthInMilliseconds;
private final Handler handler = new Handler();
CustomArrayAdapter adapter;
//database reference to get uploads data
DatabaseReference mDatabaseReference;
//list to store uploads data
List<Upload> uploadList = new ArrayList<>();
private TextView mSelectedTrackTitle,selected_track_ar;
private ImageView mSelectedTrackImage;
private MediaPlayer mMediaPlayer =new MediaPlayer();
private ImageView mPlayerControl;
TextView length;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_upload);
listView = (ListView) findViewById(R.id.listView);
//status = (TextView) findViewById(R.id.status);
seekBarProgress = (SeekBar)findViewById(R.id.length);
listView.setStackFromBottom(true);
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
togglePlayPause();
}
});
mSelectedTrackTitle(TextView)findViewById(R.id.selected_track_title);
mSelectedTrackImage =
(ImageView)findViewById(R.id.selected_track_image);
mPlayerControl = (ImageView)findViewById(R.id.player_control);
selected_track_ar=(TextView)findViewById(R.id.selected_track_ar);
mPlayerControl.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
togglePlayPause();
}
});
get();
//getting the database reference
mDatabaseReference = FirebaseDatabase.getInstance().
getReference(Constants.DATABASE_PATH_UPLOADS);
//retrieving upload data from firebase database
mDatabaseReference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
Upload upload = postSnapshot.getValue(Upload.class);
uploadList.add(upload);
}
adapter = new CustomArrayAdapter(getApplicationContext(),
(ArrayList<Upload>) uploadList);
listView.setAdapter(adapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mMediaPlayer != null) {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.stop();
}
mMediaPlayer.release();
mMediaPlayer = null;
}
}
private void togglePlayPause() {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
mPlayerControl.setImageResource(R.drawable.ic_play);
} else if(!mMediaPlayer.isPlaying()){
mMediaPlayer.start();
mPlayerControl.setImageResource(R.drawable.ic_pause);
mediaFileLengthInMilliseconds = mMediaPlayer.getDuration();
primarySeekBarProgressUpdater();
mSelectedTrackImage.setImageResource(R.drawable.images);
}
}
public void get()
{
seekBarProgress.setMax(99); // It means 100% .0-99
seekBarProgress.setOnTouchListener(this);
mMediaPlayer.setOnBufferingUpdateListener(this);
mMediaPlayer.setOnCompletionListener(this);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int
i, long l) {
//getting the upload
Upload upload = uploadList.get(i);
mSelectedTrackTitle.setText(upload.getName());
selected_track_ar.setText(upload.getAr());
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.stop();
mMediaPlayer.reset();
seekBarProgress.setProgress(0);
}
try {
mMediaPlayer.setDataSource(upload.getUrl());
mMediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
private void primarySeekBarProgressUpdater() {
seekBarProgress.setProgress((int
(((float)mMediaPlayer.getCurrentPosition()
/mediaFileLengthInMilliseconds)*100));
// This math construction give a percentage of "was playing"/"song
length"
if (mMediaPlayer.isPlaying()) {
Runnable notification = new Runnable() {
public void run() {
primarySeekBarProgressUpdater();
}
};
handler.postDelayed(notification,1000);
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if(v.getId() == R.id.length){
/** Seekbar onTouch event handler. Method which seeks MediaPlayer to
seekBar primary progress position*/
if(mMediaPlayer.isPlaying()){
SeekBar sb = (SeekBar)v;
int playPositionInMillisecconds = (mediaFileLengthInMilliseconds
/100) * sb.getProgress();
mMediaPlayer.seekTo(playPositionInMillisecconds);
}
}
return false;
}
@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
seekBarProgress.setSecondaryProgress(percent);
}
@Override
public void onCompletion(MediaPlayer mp) {
mPlayerControl.setImageResource(R.drawable.ic_play);
}
}
Logcat
Unrecognized GLES max version string in extensions:
ANDROID_EMU_CHECKSUM_HELPER_v1 ANDROID_EMU_dma_v1
12-19 12:28:13.753 1377-3347/? E/OMXNodeInstance:
setConfig(5610023:google.mp3.decoder,
ConfigPriority(0x6f800002)) ERROR: Undefined(0x80001001)
12-19 12:28:31.338 5777-5777/com.example.admin.firebsaseuploadd
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.admin.firebsaseuploadd, PID: 5777
java.lang.NullPointerException: Attempt to invoke virtual method 'int
android.media.MediaPlayer.getCurrentPosition()' on a null object
reference
at
com.example.admin.firebsaseuploadd.ViewUploadsActivity.
primarySeekBarProgressUp
dater(ViewUploadsActivity.java:245)
at
com.example.admin.firebsaseuploadd.ViewUploadsActivity.
access$500(ViewUploadsActivity.java:62)
at com.example.admin.firebsaseuploadd.ViewUploadsActivity$5.
run(ViewUploadsActivity.java:249)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.
run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
12-19 12:28:31.974 1311-1311/? E/EGL_emulation: tid 1311: egl
CreateSyncKHR(1881): error 0x3004 (EGL_BAD_ATTRIBUTE)
12-19 12:28:32.533 1372-3348/? E/AudioFlinger: not enough memory for
AudioTrack size=131296
12-19 12:28:32.533 1372-3348/? E/AudioFlinger: createRecordTrack_l()
initCheck failed -12; no control block?
12-19 12:28:32.534 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord:
AudioFlinger could not create record track, status: -12
12-19 12:28:32.564 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI:
Error creating AudioRecord instance: initialization check failed with
status -12.
12-19 12:28:32.564 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord object.
12-19 12:28:32.595 2522-
5797/com.google.android.googlequicksearchbox:search E/ActivityThread:
Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
12-19 12:28:37.712 1372-1794/? E/AudioFlinger: not enough memory for
AudioTrack size=131296
12-19 12:28:37.714 1372-1794/? E/AudioFlinger: createRecordTrack_l()
initCheck failed -12; no control block?
12-19 12:28:37.715 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord:
AudioFlinger could not create record track, status: -12
12-19 12:28:37.728 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI:
Error creating AudioRecord instance: initialization check failed
with status -12.
12-19 12:28:37.728 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord object.
12-19 12:28:37.729 2522-
5797/com.google.android.googlequicksearchbox:search E/ActivityThread:
Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
12-19 12:28:42.882 1372-1443/? E/AudioFlinger: not enough memory for
AudioTrack size=131296
12-19 12:28:42.883 1372-1443/? E/AudioFlinger: createRecordTrack_l()
initCheck failed -12; no control block?
12-19 12:28:42.883 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord:
AudioFlinger could not create record track, status: -12
12-19 12:28:42.916 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI:
Error creating AudioRecord instance: initialization check failed with
status -12.
12-19 12:28:42.917 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord object.
12-19 12:28:42.929 2522-
5797/com.google.android.googlequicksearchbox:search E/ActivityThread:
Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
12-19 12:28:48.085 1372-1793/? E/AudioFlinger: not enough memory for
AudioTrack size=131296
12-19 12:28:48.136 1372-1793/? E/AudioFlinger: createRecordTrack_l()
initCheck failed -12; no control block?
12-19 12:28:48.151 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord:
AudioFlinger could not create record track, status: -12
12-19 12:28:48.248 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI:
Error creating AudioRecord instance: initialization check failed with
status -12.
12-19 12:28:48.249 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord object.
12-19 12:28:48.251 2522-
5797/com.google.android.googlequicksearchbox:search E/ActivityThread:
Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
12-19 12:28:53.439 1372-1793/? E/AudioFlinger: not enough memory for
AudioTrack size=131296
12-19 12:28:53.439 1372-1793/? E/AudioFlinger: createRecordTrack_l()
initCheck failed -12; no control block?
12-19 12:28:53.443 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord:
AudioFlinger could not create record track, status: -12
12-19 12:28:53.455 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI:
Error creating AudioRecord instance: initialization check failed with
status -12.
12-19 12:28:53.456 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord object.
12-19 12:28:53.457 2522-
5797/com.google.android.googlequicksearchbox:search E/ActivityThread:
Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
12-19 12:28:58.551 1372-1793/? E/AudioFlinger: not enough memory for
AudioTrack size=131296
12-19 12:28:58.552 1372-1793/? E/AudioFlinger: createRecordTrack_l()
initCheck failed -12; no control block?
12-19 12:28:58.552 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord:
AudioFlinger could not create record track, status: -12
12-19 12:28:58.573 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI:
Error creating AudioRecord instance: initialization check failed with
status -12.
12-19 12:28:58.574 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord
object.
12-19 12:28:58.577 2522-
5797/com.google.android.googlequicksearchbox:search E/ActivityThread:
Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
12-19 12:29:03.652 1372-1794/? E/AudioFlinger: not enough memory for
AudioTrack size=131296
12-19 12:29:03.652 1372-1794/? E/AudioFlinger: createRecordTrack_l()
initCheck failed -12; no control block?
12-19 12:29:03.652 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord:
AudioFlinger could not create record track, status:-12
12-19 12:29:03.678 2522-
5797/com.google.android.googlequicksearchbox:search E/AudioRecord-JNI:
Error creating AudioRecord instance: initialization check failed with
status -12.
12-19 12:29:03.678 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord object.
12-19 12:29:03.679 2522-
5797/com.google.android.googlequicksearchbox:search E/ActivityThread:
Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.recorded
12-19 12:29:08.775 1372-1443/? E/AudioFlinger: not enough memory for
AudioTrack
size=131296
12-19 12:29:08.775 1372-1443/? E/AudioFlinger: createRecordTrack_l()
initCheck
failed -12; no control block?
12-19 12:29:08.778 2522-5
797/com.google.android.googlequicksearchbox:search
E/AudioRecord: AudioFlinger could not create record track, status: -12
12-19 12:29:08.804 2522-5797/com.google.android.googlequicksearchbox:search
E/AudioRecord-JNI: Error creating AudioRecord instance: initialization
check failed with status -12.
12-19 12:29:08.805 2522-
5797/com.google.android.googlequicksearchbox:search
E/android.media.AudioRecord: Error code -20 when initializing native
AudioRecord object.
12-19 12:29:08.809 2522-
5797/com.google.android.googlequicksearchbox:search
E/ActivityThread: Failed to find provider info for
com.google.android.apps.gsa.testing.ui.audio.record ed
teilen logcat Fehler –
deutlich in Ihrem 'logcat' geschrieben, dass Es ist 'NullPointerException'. Sieh dir das an. 'java.lang.NullPointerException: Versuch virtuelle Methode aufzurufen int android.media.MediaPlayer.getCurrentPosition() auf einem Null-Objekt Referenz bei com.example.admin.firebsaseuploadd.ViewUploadsActivity. primarySeekBarProgressUp dater (ViewUploadsActivity.java:245) 'so debuggen Sie Ihren Code und versuchen, Exception zu lösen. – Dharmishtha
vollständige Aktivität Lebenszyklus kann es Ihnen helfen onPause() onResume() –