Android findViewById in DialogFragment

Question

I am trying to develop a date picker that sets the value of a text view when set.

But I cannot select the TV from the DialogFragment that handles the date picker.

I tried getView but the application crashes at the specific point.

Here's my code:

@SuppressLint("NewApi") public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {      TextView mTextView;      @Override     public View onCreateView(LayoutInflater inflater, ViewGroup container,             Bundle savedInstanceState) {                  // R.layout.my_layout - that's the layout where your textview is placed         View view = inflater.inflate(R.layout.activity_register_screen, container, false);         mTextView = (TextView) view.findViewById(R.id.tvDate);         // you can use your textview.         return view;     }      @Override     public Dialog onCreateDialog(Bundle savedInstanceState) {         // Use the current date as the default date in the picker         final Calendar c = Calendar.getInstance();         int year = c.get(Calendar.YEAR);         int month = c.get(Calendar.MONTH);         int day = c.get(Calendar.DAY_OF_MONTH);          // Create a new instance of DatePickerDialog and return it         return new DatePickerDialog(getActivity(), this, year, month, day);     }      public void onDateSet(DatePicker view, int year, int month, int day) {         int syear = year;         int smonth = month;         int sday = day;         // set selected date into textview         mTextView.setText(new StringBuilder().append(smonth + 1)            .append("-").append(sday).append("-").append(syear)            .append(" "));     } } 

Updated with new code and the following error:

04-15 09:45:30.880: E/AndroidRuntime(23016): FATAL EXCEPTION: main 04-15 09:45:30.880: E/AndroidRuntime(23016): android.util.AndroidRuntimeException: requestFeature() must be called before adding content 04-15 09:45:30.880: E/AndroidRuntime(23016):    at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:239) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at com.android.internal.app.AlertController.installContent(AlertController.java:236) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.AlertDialog.onCreate(AlertDialog.java:336) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.Dialog.dispatchOnCreate(Dialog.java:353) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.Dialog.show(Dialog.java:257) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.DialogFragment.onStart(DialogFragment.java:490) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.Fragment.performStart(Fragment.java:1537) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:866) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1036) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.BackStackRecord.run(BackStackRecord.java:622) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1386) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.FragmentManagerImpl$1.run(FragmentManager.java:430) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.os.Handler.handleCallback(Handler.java:605) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.os.Handler.dispatchMessage(Handler.java:92) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.os.Looper.loop(Looper.java:137) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at android.app.ActivityThread.main(ActivityThread.java:4517) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at java.lang.reflect.Method.invokeNative(Native Method) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at java.lang.reflect.Method.invoke(Method.java:511) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760) 04-15 09:45:30.880: E/AndroidRuntime(23016):    at dalvik.system.NativeStart.main(Native Method) 

SOLVED

Answer 1

To get a specific view in Fragment / Fragment dialog you should use onCreateView(). Here is an example how to do that :

@Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {     // R.layout.my_layout - that's the layout where your textview is placed     View view = inflater.inflate(R.layout.my_layout, container, false);     TextView mTextView = (TextView) view.findViewById(R.id.colors);     // you can use your textview.     return view; } 

Check first if onCreateDialog() is called before onCreateView() and if that's true try using something like this :

@Override public Dialog onCreateDialog(Bundle savedInstanceState) {     // Use the Builder class for convenient dialog construction     AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());     LayoutInflater inflater = getActivity().getLayoutInflater();     View view = inflater.inflate(R.layout. activity_register_screen, null);     builder.setView(view);     // Create the AlertDialog object and return it     return builder.create(); } 

Answer 2

There is more simple way to find views in DialogFragment.

@Override public void onStart() {     super.onStart();     mTextView = (TextView) getDialog().findViewById(R.id.tvDate); }