SharedPreferencesCompat.java revision f185f104c4786740765e549d535f9ba1052f96cc 
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 android.support.v4.content;
18
19import android.content.SharedPreferences;
20import android.os.Build;
21import android.support.annotation.NonNull;
22
23public final class SharedPreferencesCompat {
24
25    public final static class EditorCompat {
26
27        private static EditorCompat sInstance;
28
29        private static class Helper {
30            public void apply(@NonNull SharedPreferences.Editor editor) {
31                try {
32                    editor.apply();
33                } catch (AbstractMethodError unused) {
34                    // The app injected its own pre-Gingerbread
35                    // SharedPreferences.Editor implementation without
36                    // an apply method.
37                    editor.commit();
38                }
39            }
40        }
41
42        private final Helper mHelper;
43
44        private EditorCompat() {
45            mHelper = new Helper();
46        }
47
48        public static EditorCompat getInstance() {
49            if (sInstance == null) {
50                sInstance = new EditorCompat();
51            }
52            return sInstance;
53        }
54
55        public void apply(@NonNull SharedPreferences.Editor editor) {
56            // Note that this redirection is needed to not break the public API chain
57            // of getInstance().apply() calls. Otherwise this method could (and should)
58            // be static.
59            mHelper.apply(editor);
60        }
61    }
62
63    private SharedPreferencesCompat() {}
64
65}
66