Detect back button but don't dismiss dialogfragment

Question

I have a dialogfragment for a floating dialog which includes a special keyboard that pops up when a user presses inside an EditText field (the normal IME is stopped from bei

Answer 1

As an addendum to Juan Pedro Martinez's answer I thought it would be helpful to clarify a specific question (one that I had) when looking at this thread.

If you wish to create a new DialogFragment and have it so the user can only cancel it using the back-button, which eliminates random screen touches from canceling the fragment prematurely, then this is the code that you would use.

In what ever code that you call the DialogFragment you need to set the cancelable setting to false so that NOTHING dismisses the fragment, no stray screen touches, etc.

DialogFragment mDialog= new MyDialogFragment();
mDialog.setCancelable(false);
mDialog.show(getFragmentManager(), "dialog");

Then, within your DialogFragment, in this case MyDaialogFragment.java, you add the onResume override code to have the dialog listen for the Back Button. When it's pressed it will execute the dismiss() to close the fragment.

@Override
 public void onResume() 
 {
     super.onResume();

     getDialog().setOnKeyListener(new OnKeyListener()
     {
         @Override
         public boolean onKey(android.content.DialogInterface dialog, 
                              int keyCode,android.view.KeyEvent event) 
         {
              if ((keyCode ==  android.view.KeyEvent.KEYCODE_BACK))
              {
                   // To dismiss the fragment when the back-button is pressed.
                   dismiss();
                   return true;
              }
              // Otherwise, do nothing else
              else return false;
         }
   });

Now your dialog will be called with the "setCancelable" to false, meaning nothing (no outside clicks) can cancel it and shut it down, and allowing (from within the dialog itself) only the back button to close it.

Ganbatte!