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