android-dialog-fragment.md

Title: Android: DialogFragment Tags: android|android-dialogues|android-fragments|android-dialogfragment Date: 2013-01-06 14:28:07 -0500 Author: Denevell

You call a DialogFragment into existence by making a new dialogue object using a static constructor with its data (see below) and then issuing the show() method, passing in your FragmentManager and optional tag.

 newFragment = BasicDialogueFragment.newInstance("title", "message");
 newFragment.show(context.getSupportFragmentManager(), "tag");  	

Now here's the BasicDialogFragment class. Note the static newInstance() which takes in the parameters and stores them in a bundle which retained in the fragment through setRetainInstance(true);

We use newInstance() instead of passing arguments into the Fragment's constructor since the documentation and lint warn us against that, since the Fragment may be reinitialised via a call to the Fragment's constructor with no arguments.

 public class BasicDialogueFragment extends android.support.v4.app.DialogFragment {
  private String mTitle;
  private String mMessage;
 
  public static BasicDialogueFragment newInstance(String title, String message) {
    BasicDialogueFragment dialogue = new BasicDialogueFragment();
    dialogue.mTitle = title;
    dialogue.mMessage = message;
    return dialogue;
  }
 
  @Override
  public Dialog onCreateDialog(Bundle savedInstanceState) {
    setRetainInstance(true);
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setMessage(mMessage);
    builder.setTitle(mTitle);	
    return builder.create();
  }
 
  @Override
  public void onDestroyView() {
   // Used because of a bug in the support library
   if (getDialog() != null && getRetainInstance())
      getDialog().setDismissMessage(null);
   super.onDestroyView();
  }      
 }