media/MidiSynth/Application/src/main/java/com/example/android/midisynth/MidiSynthDeviceService.java

/*
 * Copyright (C) 2015 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.example.android.midisynth;

import android.media.midi.MidiDeviceService;
import android.media.midi.MidiDeviceStatus;
import android.media.midi.MidiReceiver;

import com.example.android.common.midi.synth.SynthEngine;

public class MidiSynthDeviceService extends MidiDeviceService {

    private static final String TAG = MainActivity.TAG;
    private SynthEngine mSynthEngine = new SynthEngine();
    private boolean mSynthStarted = false;

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override
    public void onDestroy() {
        mSynthEngine.stop();
        super.onDestroy();
    }

    @Override
    public MidiReceiver[] onGetInputPortReceivers() {
        return new MidiReceiver[]{mSynthEngine};
    }

    /**
     * This will get called when clients connect or disconnect.
     */
    @Override
    public void onDeviceStatusChanged(MidiDeviceStatus status) {
        if (status.isInputPortOpen(0) && !mSynthStarted) {
            mSynthEngine.start();
            mSynthStarted = true;
        } else if (!status.isInputPortOpen(0) && mSynthStarted) {
            mSynthEngine.stop();
            mSynthStarted = false;
        }
    }

}