Android example source code file (AccessibilityManager.java)

This example Android source code file (AccessibilityManager.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

accessibilitymanager, android, content, list, util

The AccessibilityManager.java Android example source code

/*
 * 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.content.Context;
import android.content.pm.ServiceInfo;

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();

    /**
     * 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);
    }
}