Myujth

I have a Navigation drawer activity and many fragments that I reach via the nav drawer.

In some of these fragments, I show a dialog which says "Loading.." while background tasks are happening.

Now I've made my dialogs not-cancellable by dialog.setCancelable(false) so that the user doesn't accidentally dismiss it by clicking anywhere on the screen. This makes it un-cancelable even when the phone back button is pressed.

This is the code for my dialog -

Dialog dialog = new Dialog(context);
 dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
 dialog.setContentView(R.layout.custom_progress_dialog);
 ((TextView)dialog.findViewById(R.id.custom_dialog_message)).setText("Loading ...");

 dialog.setCancelable(false); 
 dialog.show();

I need to write code to dismiss the loading dialog and go to the previous fragment when the phone back button is pressed while on any fragment.

Can somebody help me out? Mostly I need implementing backPress specific to a fragment. Thanks!

you can use getFragmentManager().popBackStackImmediate();

dialog.setOnKeyListener(new Dialog.OnKeyListener() 
 @Override
 public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) 
 // TODO Auto-generated method stub
 if (keyCode == KeyEvent.KEYCODE_BACK) 
 dialog.dismiss();
 getFragmentManager().popBackStackImmediate();
 
 return true;
 
 );

It's simple as this

dialog.setOnKeyListener(new Dialog.OnKeyListener() 
 @Override
 public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) 
 // TODO Auto-generated method stub
 if (keyCode == KeyEvent.KEYCODE_BACK) 
 dialog.dismiss();
 
 return true;
 
 );

Remove your code line :

dialog.setCancelable(false); 

and put this one and try

dialog.setCanceledOnTouchOutside(false);

With this your dialog will not cancel if user accidentally touch on the screen, but if user press back button then it will cancel

please put the following code where you are initializing the alertDialogbuilder.

 alertDialogBuilder = new AlertDialog.Builder(this);

 alertDialogBuilder.setOnKeyListener(new Dialog.OnKeyListener() 
 @Override
 public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) 
 // TODO Auto-generated method stub
 if (keyCode == KeyEvent.KEYCODE_BACK) 
 dialog.dismiss();
 getFragmentManager().popBackStackImmediate();
 
 return true;
 
 );