Merge "Add a helper function to query CBR package name." into rvc-dev am: 20b8e917

/*

 * Copyright (C) 2020 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.internal.telephony;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import android.provider.Telephony;

import android.text.TextUtils;

import android.util.Log;

/**

 * This class provides utility functions related to CellBroadcast.

 */

public class CellBroadcastUtils {

    private static final String TAG = "CellBroadcastUtils";

    private static final boolean VDBG = false;

    /**

     * Utility method to query the default CBR's package name.

     */

    public static String getDefaultCellBroadcastReceiverPackageName(Context context) {

        PackageManager packageManager = context.getPackageManager();

        ResolveInfo resolveInfo = packageManager.resolveActivity(

                new Intent(Telephony.Sms.Intents.SMS_CB_RECEIVED_ACTION),

                PackageManager.MATCH_SYSTEM_ONLY);

        String packageName;

        if (resolveInfo == null) {

            Log.e(TAG, "getDefaultCellBroadcastReceiverPackageName: no package found");

            return null;

        }

        packageName = resolveInfo.activityInfo.applicationInfo.packageName;

        if (VDBG) {

            Log.d(TAG, "getDefaultCellBroadcastReceiverPackageName: found package: " + packageName);

        }

        if (TextUtils.isEmpty(packageName) || packageManager.checkPermission(

                android.Manifest.permission.READ_CELL_BROADCASTS, packageName)

                == PackageManager.PERMISSION_DENIED) {

            Log.e(TAG, "getDefaultCellBroadcastReceiverPackageName: returning null; "

                    + "permission check failed for : " + packageName);

            return null;

        }

        return packageName;

    }

}