src/com/android/phone/RoamingDialogFragment.java

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.phone;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;

/**
 * A dialog fragment that asks the user if they are sure they want to turn on data roaming
 * to avoid accidental charges.
 */
public class RoamingDialogFragment extends DialogFragment implements OnClickListener {

    /**
     * The interface we expect a host activity to implement.
     */
    public interface RoamingDialogListener {
        void onPositiveButtonClick(DialogFragment dialog);
    }

    // the host activity which implements the listening interface
    private RoamingDialogListener mListener;


    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        // Verify host activity implemented callback interface
        try {
            mListener = (RoamingDialogListener) getActivity();
        } catch (ClassCastException e) {
            throw new ClassCastException(getActivity().toString() +
                    "must implement RoamingDialogListener");
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage(getResources().getString(R.string.roaming_warning))
                .setTitle(R.string.roaming_alert_title)
                .setIconAttribute(android.R.attr.alertDialogIcon)
                .setPositiveButton(android.R.string.yes, this)
                .setNegativeButton(android.R.string.no, this);
        return builder.create();
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        // let the host know that the positive button has been clicked
        if (which == dialog.BUTTON_POSITIVE) {
            mListener.onPositiveButtonClick(this);
        }
    }
}