/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.calculator2;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.app.Dialog;
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import android.app.DialogFragment;
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import android.app.FragmentManager;
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import android.content.DialogInterface;
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import android.os.Bundle;
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import androidx.annotation.Nullable;
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import androidx.annotation.StringRes;
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import android.view.LayoutInflater;
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import android.widget.TextView;
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/**
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* Display a message with a dismiss putton, and optionally a second button.
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*/
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public class AlertDialogFragment extends DialogFragment implements DialogInterface.OnClickListener {
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public interface OnClickListener {
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/**
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* This method will be invoked when a button in the dialog is clicked.
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*
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* @param fragment the AlertDialogFragment that received the click
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* @param which the button that was clicked (e.g.
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* {@link DialogInterface#BUTTON_POSITIVE}) or the position
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* of the item clicked
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*/
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void onClick(AlertDialogFragment fragment, int which);
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}
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private static final String NAME = AlertDialogFragment.class.getName();
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private static final String KEY_MESSAGE = NAME + "_message";
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private static final String KEY_BUTTON_NEGATIVE = NAME + "_button_negative";
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private static final String KEY_BUTTON_POSITIVE = NAME + "_button_positive";
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private static final String KEY_TITLE = NAME + "_title";
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/**
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* Convenience method for creating and showing a DialogFragment with the given message and
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* title.
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*
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* @param activity originating Activity
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* @param title resource id for the title string
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* @param message resource id for the displayed message string
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* @param positiveButtonLabel label for second button, if any. If non-null, activity must
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* implement AlertDialogFragment.OnClickListener to respond.
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*/
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public static void showMessageDialog(Activity activity, @StringRes int title,
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@StringRes int message, @StringRes int positiveButtonLabel, @Nullable String tag) {
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showMessageDialog(activity, title != 0 ? activity.getString(title) : null,
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activity.getString(message),
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positiveButtonLabel != 0 ? activity.getString(positiveButtonLabel) : null,
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tag);
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}
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/**
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* Create and show a DialogFragment with the given message.
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*
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* @param activity originating Activity
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* @param title displayed title, if any
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* @param message displayed message
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* @param positiveButtonLabel label for second button, if any. If non-null, activity must
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* implement AlertDialogFragment.OnClickListener to respond.
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*/
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public static void showMessageDialog(Activity activity, @Nullable CharSequence title,
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CharSequence message, @Nullable CharSequence positiveButtonLabel, @Nullable String tag)
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{
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final FragmentManager manager = activity.getFragmentManager();
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if (manager == null || manager.isDestroyed()) {
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return;
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}
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final AlertDialogFragment dialogFragment = new AlertDialogFragment();
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final Bundle args = new Bundle();
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args.putCharSequence(KEY_MESSAGE, message);
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args.putCharSequence(KEY_BUTTON_NEGATIVE, activity.getString(R.string.dismiss));
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if (positiveButtonLabel != null) {
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args.putCharSequence(KEY_BUTTON_POSITIVE, positiveButtonLabel);
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}
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args.putCharSequence(KEY_TITLE, title);
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dialogFragment.setArguments(args);
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dialogFragment.show(manager, tag /* tag */);
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}
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public AlertDialogFragment() {
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setStyle(STYLE_NO_TITLE, android.R.attr.alertDialogTheme);
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}
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@Override
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public Dialog onCreateDialog(Bundle savedInstanceState) {
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final Bundle args = getArguments() == null ? Bundle.EMPTY : getArguments();
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final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
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final LayoutInflater inflater = LayoutInflater.from(builder.getContext());
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final TextView messageView = (TextView) inflater.inflate(
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R.layout.dialog_message, null /* root */);
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messageView.setText(args.getCharSequence(KEY_MESSAGE));
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builder.setView(messageView);
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builder.setNegativeButton(args.getCharSequence(KEY_BUTTON_NEGATIVE), null /* listener */);
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final CharSequence positiveButtonLabel = args.getCharSequence(KEY_BUTTON_POSITIVE);
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if (positiveButtonLabel != null) {
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builder.setPositiveButton(positiveButtonLabel, this);
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}
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builder.setTitle(args.getCharSequence(KEY_TITLE));
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return builder.create();
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}
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@Override
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public void onClick(DialogInterface dialog, int which) {
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final Activity activity = getActivity();
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if (activity instanceof AlertDialogFragment.OnClickListener /* always true */) {
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((AlertDialogFragment.OnClickListener) activity).onClick(this, which);
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}
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}
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}
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