1 /* 2 * Copyright (C) 2013 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 17 package com.android.keyguard; 18 19 import android.content.ContentResolver; 20 import android.content.Context; 21 import android.media.AudioManager; 22 import android.os.UserHandle; 23 import android.provider.Settings; 24 import android.view.View; 25 import android.view.View.AccessibilityDelegate; 26 import android.view.accessibility.AccessibilityEvent; 27 import android.view.accessibility.AccessibilityNodeInfo; 28 29 import com.android.internal.R; 30 31 /** 32 * Accessibility delegate that obscures speech for a view when the user has 33 * not turned on the "speak passwords" preference and is not listening 34 * through headphones. 35 */ 36 class ObscureSpeechDelegate extends AccessibilityDelegate { 37 /** Whether any client has announced the "headset" notification. */ 38 static boolean sAnnouncedHeadset = false; 39 40 private final ContentResolver mContentResolver; 41 private final AudioManager mAudioManager; 42 ObscureSpeechDelegate(Context context)43 public ObscureSpeechDelegate(Context context) { 44 mContentResolver = context.getContentResolver(); 45 mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE); 46 } 47 48 @Override sendAccessibilityEvent(View host, int eventType)49 public void sendAccessibilityEvent(View host, int eventType) { 50 super.sendAccessibilityEvent(host, eventType); 51 52 // Play the "headset required" announcement the first time the user 53 // places accessibility focus on a key. 54 if ((eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) 55 && !sAnnouncedHeadset && shouldObscureSpeech()) { 56 sAnnouncedHeadset = true; 57 host.announceForAccessibility(host.getContext().getString( 58 R.string.keyboard_headset_required_to_hear_password)); 59 } 60 } 61 62 @Override onPopulateAccessibilityEvent(View host, AccessibilityEvent event)63 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 64 super.onPopulateAccessibilityEvent(host, event); 65 66 if ((event.getEventType() != AccessibilityEvent.TYPE_ANNOUNCEMENT) 67 && shouldObscureSpeech()) { 68 event.getText().clear(); 69 event.setContentDescription(host.getContext().getString( 70 R.string.keyboard_password_character_no_headset)); 71 } 72 } 73 74 @Override onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info)75 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 76 super.onInitializeAccessibilityNodeInfo(host, info); 77 78 if (shouldObscureSpeech()) { 79 final Context ctx = host.getContext(); 80 info.setText(null); 81 info.setContentDescription( 82 ctx.getString(R.string.keyboard_password_character_no_headset)); 83 } 84 } 85 86 @SuppressWarnings("deprecation") shouldObscureSpeech()87 private boolean shouldObscureSpeech() { 88 // The user can optionally force speaking passwords. 89 if (Settings.Secure.getIntForUser(mContentResolver, 90 Settings.Secure.ACCESSIBILITY_SPEAK_PASSWORD, 0, UserHandle.USER_CURRENT) != 0) { 91 return false; 92 } 93 94 // Always speak if the user is listening through headphones. 95 if (mAudioManager.isWiredHeadsetOn() || mAudioManager.isBluetoothA2dpOn()) { 96 return false; 97 } 98 99 // Don't speak since this key is used to type a password. 100 return true; 101 } 102 }