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/*
* Copyright (C) 2011 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.inputmethod.accessibility;
import android.content.Context;
import android.content.SharedPreferences;
import android.inputmethodservice.InputMethodService;
import android.os.SystemClock;
import android.util.Log;
import android.view.MotionEvent;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import com.android.inputmethod.compat.AccessibilityEventCompatUtils;
import com.android.inputmethod.compat.AccessibilityManagerCompatWrapper;
import com.android.inputmethod.compat.MotionEventCompatUtils;
public class AccessibilityUtils {
private static final String TAG = AccessibilityUtils.class.getSimpleName();
private static final String CLASS = AccessibilityUtils.class.getClass().getName();
private static final String PACKAGE = AccessibilityUtils.class.getClass().getPackage()
.getName();
private static final AccessibilityUtils sInstance = new AccessibilityUtils();
private AccessibilityManager mAccessibilityManager;
private AccessibilityManagerCompatWrapper mCompatManager;
/*
* Setting this constant to {@code false} will disable all keyboard
* accessibility code, regardless of whether Accessibility is turned on in
* the system settings. It should ONLY be used in the event of an emergency.
*/
private static final boolean ENABLE_ACCESSIBILITY = true;
public static void init(InputMethodService inputMethod, SharedPreferences prefs) {
if (!ENABLE_ACCESSIBILITY)
return;
// These only need to be initialized if the kill switch is off.
sInstance.initInternal(inputMethod, prefs);
KeyCodeDescriptionMapper.init(inputMethod, prefs);
AccessibleInputMethodServiceProxy.init(inputMethod, prefs);
AccessibleKeyboardViewProxy.init(inputMethod, prefs);
}
public static AccessibilityUtils getInstance() {
return sInstance;
}
private AccessibilityUtils() {
// This class is not publicly instantiable.
}
private void initInternal(Context context, SharedPreferences prefs) {
mAccessibilityManager = (AccessibilityManager) context
.getSystemService(Context.ACCESSIBILITY_SERVICE);
mCompatManager = new AccessibilityManagerCompatWrapper(mAccessibilityManager);
}
/**
* Returns {@code true} if touch exploration is enabled. Currently, this
* means that the kill switch is off, the device supports touch exploration,
* and a spoken feedback service is turned on.
*
* @return {@code true} if touch exploration is enabled.
*/
public boolean isTouchExplorationEnabled() {
return ENABLE_ACCESSIBILITY
&& mAccessibilityManager.isEnabled()
&& mCompatManager.isTouchExplorationEnabled();
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}
/**
* Returns {@true} if the provided event is a touch exploration (e.g. hover)
* event. This is used to determine whether the event should be processed by
* the touch exploration code within the keyboard.
*
* @param event The event to check.
* @return {@true} is the event is a touch exploration event
*/
public boolean isTouchExplorationEvent(MotionEvent event) {
final int action = event.getAction();
return action == MotionEventCompatUtils.ACTION_HOVER_ENTER
|| action == MotionEventCompatUtils.ACTION_HOVER_EXIT
|| action == MotionEventCompatUtils.ACTION_HOVER_MOVE;
}
/**
* Sends the specified text to the {@link AccessibilityManager} to be
* spoken.
*
* @param text the text to speak
*/
public void speak(CharSequence text) {
if (!mAccessibilityManager.isEnabled()) {
Log.e(TAG, "Attempted to speak when accessibility was disabled!");
return;
}
// The following is a hack to avoid using the heavy-weight TextToSpeech
// class. Instead, we're just forcing a fake AccessibilityEvent into
// the screen reader to make it speak.
final AccessibilityEvent event = AccessibilityEvent
.obtain(AccessibilityEventCompatUtils.TYPE_VIEW_HOVER_ENTER);
event.setPackageName(PACKAGE);
event.setClassName(CLASS);
event.setEventTime(SystemClock.uptimeMillis());
event.setEnabled(true);
event.getText().add(text);
mAccessibilityManager.sendAccessibilityEvent(event);
}
}