55c0198eee
* commit 'c960695f38ae0564dff3a6897fd1843c8e74c604': Updated keyboard to use SPEAK_PASSWORD preference.
183 lines
7.1 KiB
Java
183 lines
7.1 KiB
Java
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.accessibility;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.inputmethodservice.InputMethodService;
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import android.media.AudioManager;
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import android.os.SystemClock;
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import android.provider.Settings;
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import android.util.Log;
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import android.view.MotionEvent;
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import android.view.accessibility.AccessibilityEvent;
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import android.view.accessibility.AccessibilityManager;
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import android.view.inputmethod.EditorInfo;
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import com.android.inputmethod.compat.AccessibilityManagerCompatWrapper;
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import com.android.inputmethod.compat.AudioManagerCompatWrapper;
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import com.android.inputmethod.compat.InputTypeCompatUtils;
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import com.android.inputmethod.compat.MotionEventCompatUtils;
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import com.android.inputmethod.compat.SettingsSecureCompatUtils;
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import com.android.inputmethod.latin.R;
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public class AccessibilityUtils {
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private static final String TAG = AccessibilityUtils.class.getSimpleName();
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private static final String CLASS = AccessibilityUtils.class.getClass().getName();
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private static final String PACKAGE = AccessibilityUtils.class.getClass().getPackage()
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.getName();
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private static final AccessibilityUtils sInstance = new AccessibilityUtils();
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private Context mContext;
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private AccessibilityManager mAccessibilityManager;
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private AccessibilityManagerCompatWrapper mCompatManager;
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private AudioManagerCompatWrapper mAudioManager;
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/*
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* Setting this constant to {@code false} will disable all keyboard
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* accessibility code, regardless of whether Accessibility is turned on in
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* the system settings. It should ONLY be used in the event of an emergency.
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*/
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private static final boolean ENABLE_ACCESSIBILITY = true;
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public static void init(InputMethodService inputMethod, SharedPreferences prefs) {
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if (!ENABLE_ACCESSIBILITY)
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return;
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// These only need to be initialized if the kill switch is off.
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sInstance.initInternal(inputMethod, prefs);
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KeyCodeDescriptionMapper.init(inputMethod, prefs);
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AccessibleInputMethodServiceProxy.init(inputMethod, prefs);
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AccessibleKeyboardViewProxy.init(inputMethod, prefs);
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}
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public static AccessibilityUtils getInstance() {
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return sInstance;
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}
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private AccessibilityUtils() {
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// This class is not publicly instantiable.
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}
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private void initInternal(Context context, SharedPreferences prefs) {
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mContext = context;
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mAccessibilityManager = (AccessibilityManager) context
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.getSystemService(Context.ACCESSIBILITY_SERVICE);
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mCompatManager = new AccessibilityManagerCompatWrapper(mAccessibilityManager);
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final AudioManager audioManager = (AudioManager) context
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.getSystemService(Context.AUDIO_SERVICE);
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mAudioManager = new AudioManagerCompatWrapper(audioManager);
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}
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/**
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* Returns {@code true} if touch exploration is enabled. Currently, this
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* means that the kill switch is off, the device supports touch exploration,
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* and a spoken feedback service is turned on.
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*
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* @return {@code true} if touch exploration is enabled.
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*/
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public boolean isTouchExplorationEnabled() {
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return ENABLE_ACCESSIBILITY
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&& mAccessibilityManager.isEnabled()
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&& mCompatManager.isTouchExplorationEnabled();
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}
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/**
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* Returns {@true} if the provided event is a touch exploration (e.g. hover)
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* event. This is used to determine whether the event should be processed by
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* the touch exploration code within the keyboard.
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*
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* @param event The event to check.
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* @return {@true} is the event is a touch exploration event
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*/
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public boolean isTouchExplorationEvent(MotionEvent event) {
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final int action = event.getAction();
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return action == MotionEventCompatUtils.ACTION_HOVER_ENTER
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|| action == MotionEventCompatUtils.ACTION_HOVER_EXIT
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|| action == MotionEventCompatUtils.ACTION_HOVER_MOVE;
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}
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/**
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* Returns whether the device should obscure typed password characters.
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* Typically this means speaking "dot" in place of non-control characters.
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*
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* @return {@code true} if the device should obscure password characters.
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*/
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public boolean shouldObscureInput(EditorInfo editorInfo) {
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if (editorInfo == null)
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return false;
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// The user can optionally force speaking passwords.
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if (SettingsSecureCompatUtils.ACCESSIBILITY_SPEAK_PASSWORD != null) {
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final boolean speakPassword = Settings.Secure.getInt(mContext.getContentResolver(),
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SettingsSecureCompatUtils.ACCESSIBILITY_SPEAK_PASSWORD, 0) != 0;
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if (speakPassword)
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return false;
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}
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// Always speak if the user is listening through headphones.
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if (mAudioManager.isWiredHeadsetOn() || mAudioManager.isBluetoothA2dpOn())
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return false;
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// Don't speak if the IME is connected to a password field.
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return InputTypeCompatUtils.isPasswordInputType(editorInfo.inputType);
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}
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/**
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* Sends the specified text to the {@link AccessibilityManager} to be
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* spoken.
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*
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* @param text the text to speak
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*/
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public void speak(CharSequence text) {
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if (!mAccessibilityManager.isEnabled()) {
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Log.e(TAG, "Attempted to speak when accessibility was disabled!");
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return;
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}
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// The following is a hack to avoid using the heavy-weight TextToSpeech
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// class. Instead, we're just forcing a fake AccessibilityEvent into
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// the screen reader to make it speak.
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final AccessibilityEvent event = AccessibilityEvent
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.obtain(AccessibilityEvent.TYPE_VIEW_FOCUSED);
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event.setPackageName(PACKAGE);
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event.setClassName(CLASS);
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event.setEventTime(SystemClock.uptimeMillis());
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event.setEnabled(true);
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event.getText().add(text);
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mAccessibilityManager.sendAccessibilityEvent(event);
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}
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/**
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* Handles speaking the "connect a headset to hear passwords" notification
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* when connecting to a password field.
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*
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* @param editorInfo The input connection's editor info attribute.
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* @param restarting Whether the connection is being restarted.
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*/
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public void onStartInputViewInternal(EditorInfo editorInfo, boolean restarting) {
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if (shouldObscureInput(editorInfo)) {
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final CharSequence text = mContext.getText(R.string.spoken_use_headphones);
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speak(text);
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}
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}
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}
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