AudioSystemCompatUtils.java

/*
 * Copyright (C) 2012 Google Inc.
 *
 * 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.utils.compat.media;

import com.android.utils.compat.CompatUtils;

import java.lang.reflect.Method;

public class AudioSystemCompatUtils {
    private static final Class<?> CLASS_AudioSystem = CompatUtils.getClass(
            "android.media.AudioSystem");
    private static final Method METHOD_isSourceActive = CompatUtils.getMethod(
            CLASS_AudioSystem, "isSourceActive", int.class);

    /**
     * Calls into AudioSystem to check the current status of an input source.
     * <p>
     * This is only available on API 17+ and will always return false if invoked
     * on earlier platforms.
     *
     * @param source The source ID to query. Expects constants from
     *            {@code MediaRecorder.AudioSource}
     * @return {@code true} if the input source is active, {@code false}
     *         otherwise.
     */
    public static boolean isSourceActive(int source) {
        return (Boolean) CompatUtils.invoke(null, false, METHOD_isSourceActive, source);
    }
}