Android Dialogs(2)最好用DialogFragment创建Dialog

Creating a Dialog Fragment

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You can accomplish a wide variety of dialog designs—including custom layouts and those described in theDialogs design guide—by extending DialogFragment and creating a AlertDialog in the onCreateDialog()callback method.

For example, here's a basic AlertDialog that's managed within a DialogFragment:

public class FireMissilesDialogFragment extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the Builder class for convenient dialog construction
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage(R.string.dialog_fire_missiles)
               .setPositiveButton(R.string.fire, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // FIRE ZE MISSILES!
                   }
               })
               .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {
                       // User cancelled the dialog
                   }
               });
        // Create the AlertDialog object and return it
        return builder.create();
    }
}

Now, when you create an instance of this class and callshow() on that object, the dialog appears as shown in figure 1.

Figure 1. A dialog with a message and two action buttons.

The next section describes more about using theAlertDialog.Builder APIs to create the dialog.

Depending on how complex your dialog is, you can implement a variety of other callback methods in theDialogFragment, including all the basic fragment lifecycle methods.