NotificationCompatUtils.java revision a2928484f6396cfc308acb7ac68c4a20455a118c 
1/*
2 * Copyright (C) 2014 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.compat;
18
19import android.app.Notification;
20import android.os.Build;
21
22import java.lang.reflect.Field;
23import java.lang.reflect.Method;
24
25public class NotificationCompatUtils {
26    // Note that TextInfo.getCharSequence() is supposed to be available in API level 21 and later.
27    private static final Method METHOD_setColor =
28            CompatUtils.getMethod(Notification.Builder.class, "setColor", int.class);
29    private static final Method METHOD_setVisibility =
30            CompatUtils.getMethod(Notification.Builder.class, "setVisibility", int.class);
31    private static final Method METHOD_setCategory =
32            CompatUtils.getMethod(Notification.Builder.class, "setCategory", String.class);
33    private static final Method METHOD_setPriority =
34            CompatUtils.getMethod(Notification.Builder.class, "setPriority", int.class);
35    private static final Method METHOD_build =
36            CompatUtils.getMethod(Notification.Builder.class, "build");
37    private static final Field FIELD_VISIBILITY_SECRET =
38            CompatUtils.getField(Notification.class, "VISIBILITY_SECRET");
39    private static final int VISIBILITY_SECRET = null == FIELD_VISIBILITY_SECRET ? 0
40            : (Integer) CompatUtils.getFieldValue(null /* receiver */, null /* defaultValue */,
41                    FIELD_VISIBILITY_SECRET);
42    private static final Field FIELD_CATEGORY_RECOMMENDATION =
43            CompatUtils.getField(Notification.class, "CATEGORY_RECOMMENDATION");
44    private static final String CATEGORY_RECOMMENDATION = null == FIELD_CATEGORY_RECOMMENDATION ? ""
45            : (String) CompatUtils.getFieldValue(null /* receiver */, null /* defaultValue */,
46                    FIELD_CATEGORY_RECOMMENDATION);
47    private static final Field FIELD_PRIORITY_LOW =
48            CompatUtils.getField(Notification.class, "PRIORITY_LOW");
49    private static final int PRIORITY_LOW = null == FIELD_PRIORITY_LOW ? 0
50            : (Integer) CompatUtils.getFieldValue(null /* receiver */, null /* defaultValue */,
51                    FIELD_PRIORITY_LOW);
52
53    private NotificationCompatUtils() {
54        // This class is non-instantiable.
55    }
56
57    // Sets the accent color
58    public static void setColor(final Notification.Builder builder, final int color) {
59        CompatUtils.invoke(builder, null, METHOD_setColor, color);
60    }
61
62    public static void setVisibilityToSecret(final Notification.Builder builder) {
63        CompatUtils.invoke(builder, null, METHOD_setVisibility, VISIBILITY_SECRET);
64    }
65
66    public static void setCategoryToRecommendation(final Notification.Builder builder) {
67        CompatUtils.invoke(builder, null, METHOD_setCategory, CATEGORY_RECOMMENDATION);
68    }
69
70    public static void setPriorityToLow(final Notification.Builder builder) {
71        CompatUtils.invoke(builder, null, METHOD_setPriority, PRIORITY_LOW);
72    }
73
74    public static Notification build(final Notification.Builder builder) {
75        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
76            // #build was added in API level 16, JELLY_BEAN
77            return (Notification) CompatUtils.invoke(builder, null, METHOD_build);
78        } else {
79            // #getNotification was deprecated in API level 16, JELLY_BEAN
80            return builder.getNotification();
81        }
82    }
83}
84