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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.keyguard;
import android.content.ContentResolver;
import android.content.Context;
import android.media.AudioManager;
import android.os.UserHandle;
import android.provider.Settings;
import android.view.View;
import android.view.View.AccessibilityDelegate;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import com.android.internal.R;
/**
* Accessibility delegate that obscures speech for a view when the user has
* not turned on the "speak passwords" preference and is not listening
* through headphones.
*/
class ObscureSpeechDelegate extends AccessibilityDelegate {
/** Whether any client has announced the "headset" notification. */
static boolean sAnnouncedHeadset = false;
private final ContentResolver mContentResolver;
private final AudioManager mAudioManager;
public ObscureSpeechDelegate(Context context) {
mContentResolver = context.getContentResolver();
mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
}
@Override
public void sendAccessibilityEvent(View host, int eventType) {
super.sendAccessibilityEvent(host, eventType);
// Play the "headset required" announcement the first time the user
// places accessibility focus on a key.
if ((eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED)
&& !sAnnouncedHeadset && shouldObscureSpeech()) {
sAnnouncedHeadset = true;
host.announceForAccessibility(host.getContext().getString(
R.string.keyboard_headset_required_to_hear_password));
}
}
@Override
public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) {
super.onPopulateAccessibilityEvent(host, event);
if ((event.getEventType() != AccessibilityEvent.TYPE_ANNOUNCEMENT)
&& shouldObscureSpeech()) {
event.getText().clear();
event.setContentDescription(host.getContext().getString(
R.string.keyboard_password_character_no_headset));
}
}
@Override
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(host, info);
if (shouldObscureSpeech()) {
final Context ctx = host.getContext();
info.setText(null);
info.setContentDescription(
ctx.getString(R.string.keyboard_password_character_no_headset));
}
}
@SuppressWarnings("deprecation")
private boolean shouldObscureSpeech() {
// The user can optionally force speaking passwords.
if (Settings.Secure.getIntForUser(mContentResolver,
Settings.Secure.ACCESSIBILITY_SPEAK_PASSWORD, 0, UserHandle.USER_CURRENT) != 0) {
return false;
}
// Always speak if the user is listening through headphones.
if (mAudioManager.isWiredHeadsetOn() || mAudioManager.isBluetoothA2dpOn()) {
return false;
}
// Don't speak since this key is used to type a password.
return true;
}
}
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