NullPointerException when creating a new Dialog
Solution 1
It could be because you are trying to call getActivity() from within an onClick Listener. Typically Anonymous inner classes like to only access things that are final. Trying right before creating your listener to do something like
final Context context = getActivity();
and then use context instead of getActivity() on the line that crashes.
And as a note. I would use DialogFragment here. It manages the lifecycle of your Dialog much better. Your going to run into issues when you try rotating the screen when the Dialog is open. However with the DialogFragment it will take care of this for you.
Solution 2
Try this
AlertDialog alrt = (AlertDialog )arg0;
AlertDialog.Builder builder = new AlertDialog.Builder(alrt.getContext());
Also dismiss the old dialog after showing new dialog.
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tyczj
Updated on October 14, 2022Comments
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tyczj over 1 year
I have a DialogFragment that creates a listview dialog and on a list item click I want to display an alert dialog but when I create the dialog it gives me a
NullPointerException
with an error that I have never seen before08-05 11:40:42.315: E/AndroidRuntime(4693): java.lang.NullPointerException 08-05 11:40:42.315: E/AndroidRuntime(4693): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:142) 08-05 11:40:42.315: E/AndroidRuntime(4693): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:359) 08-05 11:40:42.315: E/AndroidRuntime(4693): at com.tyczj.bowling.dialogs.SeasonType$1$1.onClick(SeasonType.java:60) 08-05 11:40:42.315: E/AndroidRuntime(4693): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 08-05 11:40:42.315: E/AndroidRuntime(4693): at android.os.Handler.dispatchMessage(Handler.java:99) 08-05 11:40:42.315: E/AndroidRuntime(4693): at android.os.Looper.loop(Looper.java:137) 08-05 11:40:42.315: E/AndroidRuntime(4693): at android.app.ActivityThread.main(ActivityThread.java:4745) 08-05 11:40:42.315: E/AndroidRuntime(4693): at java.lang.reflect.Method.invokeNative(Native Method) 08-05 11:40:42.315: E/AndroidRuntime(4693): at java.lang.reflect.Method.invoke(Method.java:511) 08-05 11:40:42.315: E/AndroidRuntime(4693): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 08-05 11:40:42.315: E/AndroidRuntime(4693): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 08-05 11:40:42.315: E/AndroidRuntime(4693): at dalvik.system.NativeStart.main(Native Method)
Here is my Dialog's
onCreate
@Override public Dialog onCreateDialog(Bundle state){ final Dialog d = new Dialog(getActivity()); d.setContentView(R.layout.dialog_layout); d.setTitle("Select a season"); ListView lv = (ListView)d.findViewById(R.id.dialog_list); String[] list = getResources().getStringArray(R.array.season_dialog_type); lv.setAdapter(new ArrayAdapter<String>(getActivity(),R.layout.stats_list_layout,list)); lv.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) { d.dismiss(); FragmentTransaction ft = getFragmentManager().beginTransaction(); if(arg2 == 0){ DialogFragment df = new SeasonsDialog(true); df.show(ft,null); }else if(arg2 == 1){ AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); final View v = getActivity().getLayoutInflater().inflate(R.layout.add_season_layout, null, false); builder.setTitle("Add a season").setView(v).setPositiveButton("Add", new OnClickListener(){ @Override public void onClick(DialogInterface arg0, int arg1) { arg0.dismiss(); AlertDialog.Builder builder2 = new AlertDialog.Builder(getActivity()); //Error here builder2.setTitle("Warning!").setMessage("Adding a new season will cause all new games to be under this season.\n\n Do you wish to continue?") .setPositiveButton("Yes", new OnClickListener(){ @Override public void onClick(DialogInterface dialog,int which) { dialog.dismiss(); EditText et = (EditText)v.findViewById(R.id.editText1); ContentValues values = new ContentValues(); values.put(Games.SEASON, et.getText().toString()); Uri uri = getActivity().getContentResolver().insert(Games.SEASONS_URI, values); et.setText(""); SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getActivity()); SharedPreferences.Editor edit = pref.edit(); edit.putLong(Preferences.SELECTED_SEASON, ContentUris.parseId(uri)).commit(); } }).setNegativeButton("No", new OnClickListener(){ @Override public void onClick(DialogInterface dialog,int which) { dialog.dismiss(); } }).create().show(); } }).setNegativeButton("Cancel", new OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }).create().show(); } } }); return d; }
it error's out at this line in my
onClick
AlertDialog.Builder builder2 = new AlertDialog.Builder(getActivity());
what does that error mean?