LoginDialogFragment.java

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    super.onCreateDialog(savedInstanceState);
    Log.i(TAG, "onCreateDialog");
    LayoutInflater lf = LayoutInflater.from(getActivity());
    
    /** 
     *  Inflate our custom view for this dialog, it contains
     *  two TextViews and two EditTexts, one set for the username
     *  and a second set for the password
     */ 
    View v = lf.inflate(R.layout.login_dialog, null);

    username = (TextView) v.findViewById(R.id.login_username);
    password = (TextView) v.findViewById(R.id.login_password);

    /**
     * Register our listener for the 'Done' key on the soft keyboard
     */
    password.setOnEditorActionListener(this);
    username.requestFocus();

    final AlertDialog dialog 
        = new AlertDialog.Builder(getActivity())
                         .setView(v)
                         .setTitle(R.string.log_in)
                         .setPositiveButton(R.string.log_in, null)
                         .setNegativeButton(R.string.cancel, null)
                         .create();

    /**
     * We have to override setOnShowListener here (min API level 8)
     * in order to validate the inputs before closing the dialog.
     * Just overriding setPositiveButton closes the dialog
     * automatically when the button is pressed
     */
    dialog.setOnShowListener(this);

    /**
     * Show the soft keyboard automatically
     */
    dialog.getWindow().setSoftInputMode(
            LayoutParams.SOFT_INPUT_STATE_VISIBLE);

    /**
     * These TextWatchers are used to clear the error icons
     * automatically once the user has remedied an error
     */
    username.addTextChangedListener(this);
    password.addTextChangedListener(this);
    return dialog;
}