AccessibilityUtils.java revision dac50ad01eee55ff85c0ca0854310a0b22b9d3b2 
1/*
2 * Copyright (C) 2012 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.gallery3d.util;
18
19import android.content.Context;
20import android.support.v4.view.accessibility.AccessibilityRecordCompat;
21import android.view.View;
22import android.view.accessibility.AccessibilityEvent;
23import android.view.accessibility.AccessibilityManager;
24
25import com.android.gallery3d.common.ApiHelper;
26
27/**
28 * AccessibilityUtils provides functions needed in accessibility mode. All the functions
29 * in this class are made compatible with gingerbread and later API's
30*/
31public class AccessibilityUtils {
32    public static void makeAnnouncement(View view, CharSequence announcement) {
33        if (view == null)
34            return;
35        if (ApiHelper.HAS_ANNOUNCE_FOR_ACCESSIBILITY) {
36            view.announceForAccessibility(announcement);
37        } else {
38            // For API 15 and earlier, we need to construct an accessibility event
39            Context ctx = view.getContext();
40            AccessibilityManager am = (AccessibilityManager) ctx.getSystemService(
41                    Context.ACCESSIBILITY_SERVICE);
42            if (!am.isEnabled()) return;
43            AccessibilityEvent event = AccessibilityEvent.obtain(
44                    AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED);
45            AccessibilityRecordCompat arc = new AccessibilityRecordCompat(event);
46            arc.setSource(view);
47            event.setClassName(view.getClass().getName());
48            event.setPackageName(view.getContext().getPackageName());
49            event.setEnabled(view.isEnabled());
50            event.getText().add(announcement);
51            am.sendAccessibilityEvent(event);
52        }
53    }
54}