AccessibilityShortcutController.java revision 33d6c08aa605bda7141ae987af0b6a8eb9329161 
1/*
2 * Copyright (C) 2012 Google Inc.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5 * use this file except in compliance with the License. You may obtain a copy of
6 * 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, WITHOUT
12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13 * License for the specific language governing permissions and limitations under
14 * the License.
15 */
16
17package com.android.server.policy;
18
19import android.accessibilityservice.AccessibilityServiceInfo;
20import android.app.ActivityManager;
21import android.app.AlertDialog;
22import android.content.ComponentName;
23import android.content.ContentResolver;
24import android.content.Context;
25import android.content.DialogInterface;
26import android.database.ContentObserver;
27import android.media.AudioAttributes;
28import android.media.Ringtone;
29import android.media.RingtoneManager;
30import android.net.Uri;
31import android.os.Handler;
32import android.os.UserHandle;
33import android.os.Vibrator;
34import android.provider.Settings;
35import android.text.TextUtils;
36import android.util.Slog;
37import android.view.Window;
38import android.view.WindowManager;
39import android.view.accessibility.AccessibilityManager;
40
41import android.widget.Toast;
42import com.android.internal.R;
43
44import java.util.List;
45
46import static android.view.WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG;
47
48/**
49 * Class to help manage the accessibility shortcut
50 */
51public class AccessibilityShortcutController {
52    private static final String TAG = "AccessibilityShortcutController";
53    private static final AudioAttributes VIBRATION_ATTRIBUTES = new AudioAttributes.Builder()
54            .setContentType(AudioAttributes.CONTENT_TYPE_SONIFICATION)
55            .setUsage(AudioAttributes.USAGE_ASSISTANCE_ACCESSIBILITY)
56            .build();
57
58
59    private final Context mContext;
60    private AlertDialog mAlertDialog;
61    private boolean mIsShortcutEnabled;
62    private boolean mEnabledOnLockScreen;
63    private int mUserId;
64
65    // Visible for testing
66    public FrameworkObjectProvider mFrameworkObjectProvider = new FrameworkObjectProvider();
67
68    public static String getTargetServiceComponentNameString(
69            Context context, int userId) {
70        final String currentShortcutServiceId = Settings.Secure.getStringForUser(
71                context.getContentResolver(), Settings.Secure.ACCESSIBILITY_SHORTCUT_TARGET_SERVICE,
72                userId);
73        if (currentShortcutServiceId != null) {
74            return currentShortcutServiceId;
75        }
76        return context.getString(R.string.config_defaultAccessibilityService);
77    }
78
79    public AccessibilityShortcutController(Context context, Handler handler, int initialUserId) {
80        mContext = context;
81        mUserId = initialUserId;
82
83        // Keep track of state of shortcut settings
84        final ContentObserver co = new ContentObserver(handler) {
85            @Override
86            public void onChange(boolean selfChange, Uri uri, int userId) {
87                if (userId == mUserId) {
88                    onSettingsChanged();
89                }
90            }
91        };
92        mContext.getContentResolver().registerContentObserver(
93                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_SHORTCUT_TARGET_SERVICE),
94                false, co, UserHandle.USER_ALL);
95        mContext.getContentResolver().registerContentObserver(
96                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_SHORTCUT_ENABLED),
97                false, co, UserHandle.USER_ALL);
98        mContext.getContentResolver().registerContentObserver(
99                Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_SHORTCUT_ON_LOCK_SCREEN),
100                false, co, UserHandle.USER_ALL);
101        setCurrentUser(mUserId);
102    }
103
104    public void setCurrentUser(int currentUserId) {
105        mUserId = currentUserId;
106        onSettingsChanged();
107    }
108
109    /**
110     * Check if the shortcut is available.
111     *
112     * @param onLockScreen Whether or not the phone is currently locked.
113     *
114     * @return {@code true} if the shortcut is available
115     */
116    public boolean isAccessibilityShortcutAvailable(boolean phoneLocked) {
117        return mIsShortcutEnabled && (!phoneLocked || mEnabledOnLockScreen);
118    }
119
120    public void onSettingsChanged() {
121        final boolean haveValidService =
122                !TextUtils.isEmpty(getTargetServiceComponentNameString(mContext, mUserId));
123        final ContentResolver cr = mContext.getContentResolver();
124        final boolean enabled = Settings.Secure.getIntForUser(
125                cr, Settings.Secure.ACCESSIBILITY_SHORTCUT_ENABLED, 1, mUserId) == 1;
126        mEnabledOnLockScreen = Settings.Secure.getIntForUser(
127                cr, Settings.Secure.ACCESSIBILITY_SHORTCUT_ON_LOCK_SCREEN, 0, mUserId) == 1;
128        mIsShortcutEnabled = enabled && haveValidService;
129    }
130
131    /**
132     * Called when the accessibility shortcut is activated
133     */
134    public void performAccessibilityShortcut() {
135        Slog.d(TAG, "Accessibility shortcut activated");
136        final ContentResolver cr = mContext.getContentResolver();
137        final int userId = ActivityManager.getCurrentUser();
138        final int dialogAlreadyShown = Settings.Secure.getIntForUser(
139                cr, Settings.Secure.ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN, 0, userId);
140
141        // Play a notification tone
142        final Ringtone tone =
143                RingtoneManager.getRingtone(mContext, Settings.System.DEFAULT_NOTIFICATION_URI);
144        if (tone != null) {
145            tone.setAudioAttributes(new AudioAttributes.Builder()
146                .setUsage(AudioAttributes.USAGE_NOTIFICATION_EVENT)
147                .build());
148            tone.play();
149        }
150
151        // Play a notification vibration
152        Vibrator vibrator = (Vibrator) mContext.getSystemService(Context.VIBRATOR_SERVICE);
153        if ((vibrator != null) && vibrator.hasVibrator()) {
154            // Don't check if haptics are disabled, as we need to alert the user that their
155            // way of interacting with the phone may change if they activate the shortcut
156            long[] vibePattern = PhoneWindowManager.getLongIntArray(mContext.getResources(),
157                    R.array.config_longPressVibePattern);
158            vibrator.vibrate(vibePattern, -1, VIBRATION_ATTRIBUTES);
159        }
160
161
162        if (dialogAlreadyShown == 0) {
163            // The first time, we show a warning rather than toggle the service to give the user a
164            // chance to turn off this feature before stuff gets enabled.
165            mAlertDialog = createShortcutWarningDialog(userId);
166            if (mAlertDialog == null) {
167                return;
168            }
169            Window w = mAlertDialog.getWindow();
170            WindowManager.LayoutParams attr = w.getAttributes();
171            attr.type = TYPE_KEYGUARD_DIALOG;
172            w.setAttributes(attr);
173            mAlertDialog.show();
174            Settings.Secure.putIntForUser(
175                    cr, Settings.Secure.ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN, 1, userId);
176        } else {
177            if (mAlertDialog != null) {
178                mAlertDialog.dismiss();
179                mAlertDialog = null;
180            }
181
182            // Show a toast alerting the user to what's happening
183            final AccessibilityServiceInfo serviceInfo = getInfoForTargetService();
184            if (serviceInfo == null) {
185                Slog.e(TAG, "Accessibility shortcut set to invalid service");
186                return;
187            }
188            String toastMessageFormatString = mContext.getString(isServiceEnabled(serviceInfo)
189                    ? R.string.accessibility_shortcut_disabling_service
190                    : R.string.accessibility_shortcut_enabling_service);
191            String toastMessage = String.format(toastMessageFormatString,
192                    serviceInfo.getResolveInfo()
193                            .loadLabel(mContext.getPackageManager()).toString());
194            Toast warningToast = mFrameworkObjectProvider.makeToastFromText(
195                    mContext, toastMessage, Toast.LENGTH_LONG);
196            warningToast.getWindowParams().privateFlags |=
197                    WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
198            warningToast.show();
199
200            mFrameworkObjectProvider.getAccessibilityManagerInstance(mContext)
201                    .performAccessibilityShortcut();
202        }
203    }
204
205    private AlertDialog createShortcutWarningDialog(int userId) {
206        final AccessibilityServiceInfo serviceInfo = getInfoForTargetService();
207
208        if (serviceInfo == null) {
209            return null;
210        }
211
212        final String warningMessage = String.format(
213                mContext.getString(R.string.accessibility_shortcut_toogle_warning),
214                serviceInfo.getResolveInfo().loadLabel(mContext.getPackageManager()).toString());
215        final AlertDialog alertDialog = mFrameworkObjectProvider.getAlertDialogBuilder(mContext)
216                .setTitle(R.string.accessibility_shortcut_warning_dialog_title)
217                .setMessage(warningMessage)
218                .setCancelable(false)
219                .setPositiveButton(R.string.leave_accessibility_shortcut_on, null)
220                .setNegativeButton(R.string.disable_accessibility_shortcut,
221                        (DialogInterface d, int which) -> {
222                            Settings.Secure.putStringForUser(mContext.getContentResolver(),
223                                    Settings.Secure.ACCESSIBILITY_SHORTCUT_TARGET_SERVICE, "",
224                                    userId);
225                        })
226                .setOnCancelListener((DialogInterface d) -> {
227                    // If canceled, treat as if the dialog has never been shown
228                    Settings.Secure.putIntForUser(mContext.getContentResolver(),
229                        Settings.Secure.ACCESSIBILITY_SHORTCUT_DIALOG_SHOWN, 0, userId);
230                })
231                .create();
232        return alertDialog;
233    }
234
235    private AccessibilityServiceInfo getInfoForTargetService() {
236        final String currentShortcutServiceString = getTargetServiceComponentNameString(
237                mContext, UserHandle.USER_CURRENT);
238        if (currentShortcutServiceString == null) {
239            return null;
240        }
241        AccessibilityManager accessibilityManager =
242                mFrameworkObjectProvider.getAccessibilityManagerInstance(mContext);
243        return accessibilityManager.getInstalledServiceInfoWithComponentName(
244                        ComponentName.unflattenFromString(currentShortcutServiceString));
245    }
246
247    private boolean isServiceEnabled(AccessibilityServiceInfo serviceInfo) {
248        AccessibilityManager accessibilityManager =
249                mFrameworkObjectProvider.getAccessibilityManagerInstance(mContext);
250        return accessibilityManager.getEnabledAccessibilityServiceList(
251                AccessibilityServiceInfo.FEEDBACK_ALL_MASK).contains(serviceInfo);
252    }
253
254    // Class to allow mocking of static framework calls
255    public static class FrameworkObjectProvider {
256        public AccessibilityManager getAccessibilityManagerInstance(Context context) {
257            return AccessibilityManager.getInstance(context);
258        }
259
260        public AlertDialog.Builder getAlertDialogBuilder(Context context) {
261            return new AlertDialog.Builder(context);
262        }
263
264        public Toast makeToastFromText(Context context, CharSequence charSequence, int duration) {
265            return Toast.makeText(context, charSequence, duration);
266        }
267    }
268}
269