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+/*
+ * Copyright (C) 2015 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.dialer.util;
+
+import android.Manifest.permission;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.content.pm.PackageManager;
+import android.support.v4.content.ContextCompat;
+import android.support.v4.content.LocalBroadcastManager;
+import com.android.dialer.common.LogUtil;
+
+/** Utility class to help with runtime permissions. */
+public class PermissionsUtil {
+
+ private static final String PERMISSION_PREFERENCE = "dialer_permissions";
+
+ public static boolean hasPhonePermissions(Context context) {
+ return hasPermission(context, permission.CALL_PHONE);
+ }
+
+ public static boolean hasContactsPermissions(Context context) {
+ return hasPermission(context, permission.READ_CONTACTS);
+ }
+
+ public static boolean hasLocationPermissions(Context context) {
+ return hasPermission(context, permission.ACCESS_FINE_LOCATION);
+ }
+
+ public static boolean hasCameraPermissions(Context context) {
+ return hasPermission(context, permission.CAMERA);
+ }
+
+ public static boolean hasPermission(Context context, String permission) {
+ return ContextCompat.checkSelfPermission(context, permission)
+ == PackageManager.PERMISSION_GRANTED;
+ }
+
+ /**
+ * Checks {@link android.content.SharedPreferences} if a permission has been requested before.
+ *
+ * <p>It is important to note that this method only works if you call {@link
+ * PermissionsUtil#permissionRequested(Context, String)} in {@link
+ * android.app.Activity#onRequestPermissionsResult(int, String[], int[])}.
+ */
+ public static boolean isFirstRequest(Context context, String permission) {
+ return context
+ .getSharedPreferences(PERMISSION_PREFERENCE, Context.MODE_PRIVATE)
+ .getBoolean(permission, true);
+ }
+
+ /**
+ * Records in {@link android.content.SharedPreferences} that the specified permission has been
+ * requested at least once.
+ *
+ * <p>This method should be called in {@link android.app.Activity#onRequestPermissionsResult(int,
+ * String[], int[])}.
+ */
+ public static void permissionRequested(Context context, String permission) {
+ context
+ .getSharedPreferences(PERMISSION_PREFERENCE, Context.MODE_PRIVATE)
+ .edit()
+ .putBoolean(permission, false)
+ .apply();
+ }
+
+ /**
+ * Rudimentary methods wrapping the use of a LocalBroadcastManager to simplify the process of
+ * notifying other classes when a particular fragment is notified that a permission is granted.
+ *
+ * <p>To be notified when a permission has been granted, create a new broadcast receiver and
+ * register it using {@link #registerPermissionReceiver(Context, BroadcastReceiver, String)}
+ *
+ * <p>E.g.
+ *
+ * <p>final BroadcastReceiver receiver = new BroadcastReceiver() { @Override public void
+ * onReceive(Context context, Intent intent) { refreshContactsView(); } }
+ *
+ * <p>PermissionsUtil.registerPermissionReceiver(getActivity(), receiver, READ_CONTACTS);
+ *
+ * <p>If you register to listen for multiple permissions, you can identify which permission was
+ * granted by inspecting {@link Intent#getAction()}.
+ *
+ * <p>In the fragment that requests for the permission, be sure to call {@link
+ * #notifyPermissionGranted(Context, String)} when the permission is granted so that any
+ * interested listeners are notified of the change.
+ */
+ public static void registerPermissionReceiver(
+ Context context, BroadcastReceiver receiver, String permission) {
+ LogUtil.i("PermissionsUtil.registerPermissionReceiver", permission);
+ final IntentFilter filter = new IntentFilter(permission);
+ LocalBroadcastManager.getInstance(context).registerReceiver(receiver, filter);
+ }
+
+ public static void unregisterPermissionReceiver(Context context, BroadcastReceiver receiver) {
+ LogUtil.i("PermissionsUtil.unregisterPermissionReceiver", null);
+ LocalBroadcastManager.getInstance(context).unregisterReceiver(receiver);
+ }
+
+ public static void notifyPermissionGranted(Context context, String permission) {
+ LogUtil.i("PermissionsUtil.notifyPermissionGranted", permission);
+ final Intent intent = new Intent(permission);
+ LocalBroadcastManager.getInstance(context).sendBroadcast(intent);
+ }
+}