PermissionsManager.java revision 604158669b407a40cd0f23538fad4dce5d738f24 
1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License
15 */
16
17package com.android.inputmethod.latin.permissions;
18
19import android.app.Activity;
20import android.content.Context;
21
22import java.util.HashMap;
23import java.util.List;
24import java.util.Map;
25
26import javax.annotation.Nonnull;
27import javax.annotation.Nullable;
28
29/**
30 * Manager to perform permission related tasks. Always call on the UI thread.
31 */
32public class PermissionsManager {
33
34    public interface PermissionsResultCallback {
35        void onRequestPermissionsResult(boolean allGranted);
36    }
37
38    private int mRequestCodeId;
39
40    private final Context mContext;
41    private final Map<Integer, PermissionsResultCallback> mRequestIdToCallback = new HashMap<>();
42
43    private static PermissionsManager sInstance;
44
45    public PermissionsManager(Context context) {
46        mContext = context;
47    }
48
49    @Nonnull
50    public static synchronized PermissionsManager get(@Nonnull Context context) {
51        if (sInstance == null) {
52            sInstance = new PermissionsManager(context);
53        }
54        return sInstance;
55    }
56
57    private synchronized int getNextRequestId() {
58        return ++mRequestCodeId;
59    }
60
61
62    public synchronized void requestPermissions(@Nonnull PermissionsResultCallback callback,
63                                   @Nullable Activity activity,
64                                   String... permissionsToRequest) {
65        List<String> deniedPermissions = PermissionsUtil.getDeniedPermissions(
66                mContext, permissionsToRequest);
67        if (deniedPermissions.isEmpty()) {
68            return;
69        }
70        // otherwise request the permissions.
71        int requestId = getNextRequestId();
72        String[] permissionsArray = deniedPermissions.toArray(
73                new String[deniedPermissions.size()]);
74
75        mRequestIdToCallback.put(requestId, callback);
76        if (activity != null) {
77            PermissionsUtil.requestPermissions(activity, requestId, permissionsArray);
78        } else {
79            PermissionsActivity.run(mContext, requestId, permissionsArray);
80        }
81    }
82
83    public synchronized void onRequestPermissionsResult(
84            int requestCode, String[] permissions, int[] grantResults) {
85        PermissionsResultCallback permissionsResultCallback = mRequestIdToCallback.get(requestCode);
86        mRequestIdToCallback.remove(requestCode);
87
88        boolean allGranted = PermissionsUtil.allGranted(grantResults);
89        permissionsResultCallback.onRequestPermissionsResult(allGranted);
90    }
91}
92