CarAudioCallbackDelegate.java
/*
* Copyright 2022 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 androidx.car.app.media;
import static java.util.Objects.requireNonNull;
import android.annotation.SuppressLint;
import android.os.RemoteException;
import androidx.annotation.Keep;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.car.app.annotations.CarProtocol;
import androidx.car.app.annotations.RequiresCarApi;
/**
* An internal delegate for performing callbacks related to car audio between library and host.
*
* <p>This is a host-side interface for handling audio callbacks. To record the microphone, use
* {@link CarAudioRecord}.
*/
@CarProtocol
@RequiresCarApi(5)
public class CarAudioCallbackDelegate {
@Keep
@Nullable
private final ICarAudioCallback mCallback;
/**
* Signifies to stop processing audio input.
*/
public void onStopRecording() {
try {
requireNonNull(mCallback).onStopRecording();
} catch (RemoteException e) {
throw new RuntimeException(e);
}
}
@NonNull
// This callback relates to a background process and is owned by the library
@SuppressLint("ExecutorRegistration")
static CarAudioCallbackDelegate create(@NonNull CarAudioCallback callback) {
return new CarAudioCallbackDelegate(callback);
}
private CarAudioCallbackDelegate(@NonNull CarAudioCallback callback) {
mCallback = new CarAudioCallbackStub(callback);
}
/** For serialization. */
private CarAudioCallbackDelegate() {
mCallback = null;
}
@Keep // We need to keep these stub for Bundler serialization logic.
private static class CarAudioCallbackStub extends ICarAudioCallback.Stub {
@Keep
@Nullable
private final CarAudioCallback mCarAudioCallback;
CarAudioCallbackStub(@NonNull CarAudioCallback callback) {
mCarAudioCallback = callback;
}
/** For serialization. */
CarAudioCallbackStub() {
mCarAudioCallback = null;
}
@Override
public void onStopRecording() {
requireNonNull(mCarAudioCallback).onStopRecording();
}
}
}