Tag: app

Everything works fine in my application, but when I press the Back button (I mean quit the application), the application is crushing. And I do not know why? I tried a couple of requests but nothing works. It is an application of sounds / ringtones.

I'm having some problems when I clicked on the button again. He tells me that you can not pause the activity. What does that mean?

Here my codes

main activity

Public class MainActivity extends AppCompatActivity {
Public MediaPlayer mp;
DrawerLayout mDrawerLayout;
NavigationView mNavigationView;
FragmentManager mFragmentManager;
FragmentTransaction mFragmentTransaction;


@Cancel
void protege onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_main);

toolbarTabs ();
sidebar ();
externalStorageAccess ();

}

// Create a sidebar and set onClickListeners
public vacuum sidebar () {
mNavigationView = (NavigationView) findViewById (R.id.navigationView);
mNavigationView.setItemIconTintList (null);
mNavigationView.setNavigationItemSelectedListener (new NavigationView.OnNavigationItemSelectedListener () {
@Cancel
public boolean onNavigationItemSelected (MenuItem menuItem) {
mDrawerLayout.closeDrawers ();

switch (menuItem.getItemId ()) {
R.id.sounds case:
FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction ();
xfragmentTransaction.replace (R.id.containerView, new TabFragment ()). commit ();
break;

R.id.share case:
Intent shareIntent = new Intent (Intent.ACTION_SEND);
shareIntent.setType ("text / plain");
shareIntent.putExtra (Intent.EXTRA_SUBJECT, getText (R.string.app_name));
shareIntent.putExtra (Intent.EXTRA_TEXT, getText (R.string.share_text) + "" + getText (R.string.app_name) + " n  n" + getText (R.string.playstore_link));
startActivity (Intent.createChooser (shareIntent, getText (R.string.share_via)));
break;

}
false return;
}

});
}


// you are listening to what sound in Tab1 was clicked
Public void TabOneItemClicked (int position) {
cleanUpMediaPlayer ();
mp = MediaPlayer.create (MainActivity.this, Tab1.soundfiles[position]);
mp.start ();

}

// you are listening to what sound in Tab2 was clicked
Public void TabTwoItemClicked (int position) {
cleanUpMediaPlayer ();
mp = MediaPlayer.create (MainActivity.this, Tab2.soundfiles[position]);
mp.start ();
}

// you are listening to what sound in Tab3 was clicked
public void TabThreeItemClicked (int position) {
cleanUpMediaPlayer ();
mp = MediaPlayer.create (MainActivity.this, Tab3.soundfiles[position]);
mp.start ();
}


// Clean MediaPlayer
public void cleanUpMediaPlayer () {
yes (mp! = null) {
try {
mp.stop ();
pf.release ();
pf = null;
} catch (exception e) {
e.printStackTrace ();
Toast.makeText (MainActivity.this, "Error", Toast.LENGTH_LONG) .show ();

}
}
}

// Access external storage
public void externalStorageAccess () {
final file FILES_PATH = new file (Environment.getExternalStorageDirectory (), "Android / data /" + getText (R.string.package_name) + "/ files");
yes (Environment.MEDIA_MOUNTED.equals (
Environment.getExternalStorageState ())) {
if (! FILES_PATH.mkdirs ()) {
Log.w ("error", "Could not be created" + FILES_PATH);
}
} else {
Toast.makeText (MainActivity.this, "Error", Toast.LENGTH_LONG) .show ();
finish();
}
}

// Create tabs from the toolbar
public toolbar empty tabs () {
mFragmentManager = getSupportFragmentManager ();
mFragmentTransaction = mFragmentManager.beginTransaction ();
mFragmentTransaction.replace (R.id.containerView, new TabFragment ()). commit ();
mDrawerLayout = (DrawerLayout) findViewById (R.id.drawerLayout);
android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById (R.id.toolbar);
ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle (this, mDrawerLayout, toolbar, R.string.app_name,
R.string.app_name);
mDrawerLayout.setDrawerListener (mDrawerToggle);
mDrawerToggle.syncState ();
}


@Cancel
null protected onPause () {
super.onPause ();
stopMediaPlayer ();
}

public void stopMediaPlayer ()
{
mp.stop ();
}
}

And this is my error log. I've been receiving errors when I build for my Android device.

                java.lang.RuntimeException: Unable to pause the activity {com.app.trying / com.app.trying.MainActivity}: java.lang.NullPointerException: I try to invoke the virtual method & # 39; void android.media.MediaPlayer. stop () & # 39; in a null object reference
in android.app.ActivityThread.performPauseActivityIfNeeded (ActivityThread.java:3735)
in android.app.ActivityThread.performPauseActivity (ActivityThread.java:3701)
in android.app.ActivityThread.performPauseActivity (ActivityThread.java:3675)
in android.app.ActivityThread.handlePauseActivity (ActivityThread.java:3649)
in android.app.ActivityThread.-wrap16 (ActivityThread.java)
in android.app.ActivityThread $ H.handleMessage (ActivityThread.java:1487)
in android.os.Handler.dispatchMessage (Handler.java:102)
on android.os.Looper.loop (Looper.java:154)
in android.app.ActivityThread.main (ActivityThread.java:6111)
in java.lang.reflect.Method.invoke (Native method)
in com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:865)
in com.android.internal.os.ZygoteInit.main (ZygoteInit.java:755)
Caused by: java.lang.NullPointerException: Try to invoke the virtual method & # 39; void android.media.MediaPlayer.stop () & # 39; in a null object reference
in com.app.trying.MainActivity.stopMediaPlayer (MainActivity.java:155)
in com.app.trying.MainActivity.onPause (MainActivity.java:150)
in android.app.Activity.performPause (Activity.java:6917)
in android.app.Instrumentation.callActivityOnPause (Instrumentation.java:1323)
in android.app.ActivityThread.performPauseActivityIfNeeded (ActivityThread.java:3724)
in android.app.ActivityThread.performPauseActivity (ActivityThread.java:3701)
in android.app.ActivityThread.performPauseActivity (ActivityThread.java:3675)
in android.app.ActivityThread.handlePauseActivity (ActivityThread.java:3649)
in android.app.ActivityThread.-wrap16 (ActivityThread.java)
in android.app.ActivityThread $ H.handleMessage (ActivityThread.java:1487)
in android.os.Handler.dispatchMessage (Handler.java:102)
on android.os.Looper.loop (Looper.java:154)
in android.app.ActivityThread.main (ActivityThread.java:6111)
in java.lang.reflect.Method.invoke (Native method)
in com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:865)
in com.android.internal.os.ZygoteInit.main (ZygoteInit.java:755)
2019-05-09 19: 13: 43.736 2484-2484 /? E / Launcher3: Meminfo, NativeHeapAllocatedSize18887424
2019-05-09 19: 13: 43.736 2484-2484 /? E / Launcher3: Meminfo, NativeHeapSize35651584
2019-05-09 19: 13: 43.736 2484-2484 /? E / Launcher3: Meminfo, getNativeHeapFreeSize16764160
2019-05-09 19: 13: 51.682 704-704 /? E / cnss-daemon: obsolete or unreachable neighbors, ndm status: 4

How should I resolve this error? Any help would be great. Thank you.