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/*
* Copyright (C) 2009 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 android.view.accessibility;
import android.accessibilityservice.AccessibilityServiceInfo;
import android.content.Context;
import android.content.pm.ServiceInfo;
import android.view.IWindow;
import android.view.View;
import java.util.Collections;
import java.util.List;
/**
* System level service that serves as an event dispatch for {@link AccessibilityEvent}s.
* Such events are generated when something notable happens in the user interface,
* for example an {@link android.app.Activity} starts, the focus or selection of a
* {@link android.view.View} changes etc. Parties interested in handling accessibility
* events implement and register an accessibility service which extends
* {@link android.accessibilityservice.AccessibilityService}.
*
* @see AccessibilityEvent
* @see android.accessibilityservice.AccessibilityService
* @see android.content.Context#getSystemService
*/
public final class AccessibilityManager {
private static AccessibilityManager sInstance = new AccessibilityManager();
/**
* Listener for the accessibility state.
*/
public interface AccessibilityStateChangeListener {
/**
* Called back on change in the accessibility state.
*
* @param enabled Whether accessibility is enabled.
*/
public void onAccessibilityStateChanged(boolean enabled);
}
/**
* Get an AccessibilityManager instance (create one if necessary).
*
* @hide
*/
public static AccessibilityManager getInstance(Context context) {
return sInstance;
}
/**
* Create an instance.
*
* @param context A {@link Context}.
*/
private AccessibilityManager() {
}
/**
* Returns if the {@link AccessibilityManager} is enabled.
*
* @return True if this {@link AccessibilityManager} is enabled, false otherwise.
*/
public boolean isEnabled() {
return false;
}
/**
* Sends an {@link AccessibilityEvent}. If this {@link AccessibilityManager} is not
* enabled the call is a NOOP.
*
* @param event The {@link AccessibilityEvent}.
*
* @throws IllegalStateException if a client tries to send an {@link AccessibilityEvent}
* while accessibility is not enabled.
*/
public void sendAccessibilityEvent(AccessibilityEvent event) {
}
/**
* Requests interruption of the accessibility feedback from all accessibility services.
*/
public void interrupt() {
}
/**
* Returns the {@link ServiceInfo}s of the installed accessibility services.
*
* @return An unmodifiable list with {@link ServiceInfo}s.
*/
public List<ServiceInfo> getAccessibilityServiceList() {
// normal implementation does this in some case, so let's do the same
// (unmodifiableList wrapped around null).
List<ServiceInfo> services = null;
return Collections.unmodifiableList(services);
}
public List<AccessibilityServiceInfo> getInstalledAccessibilityServiceList() {
// normal implementation does this in some case, so let's do the same
// (unmodifiableList wrapped around null).
List<AccessibilityServiceInfo> services = null;
return Collections.unmodifiableList(services);
}
public boolean addAccessibilityStateChangeListener(
AccessibilityStateChangeListener listener) {
return true;
}
public boolean removeAccessibilityStateChangeListener(
AccessibilityStateChangeListener listener) {
return true;
}
public int addAccessibilityInteractionConnection(IWindow windowToken,
IAccessibilityInteractionConnection connection) {
return View.NO_ID;
}
public void removeAccessibilityInteractionConnection(IWindow windowToken) {
}
}
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