common/src/java/com/example/android/common/midi/MidiInputPortSelector.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.common.midi;

import android.app.Activity;
import android.media.midi.MidiDevice;
import android.media.midi.MidiDeviceInfo;
import android.media.midi.MidiInputPort;
import android.media.midi.MidiManager;
import android.media.midi.MidiReceiver;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;

import java.io.IOException;

/**
 * Manages a Spinner for selecting a MidiInputPort.
 */
public class MidiInputPortSelector extends MidiPortSelector {
    private static final String TAG = "MidiInputPortSelector";

    private MidiInputPort mInputPort;
    private MidiDevice mOpenDevice;

    /**
     * @param midiManager
     * @param activity
     * @param spinnerId ID from the layout resource
     */
    public MidiInputPortSelector(MidiManager midiManager, Activity activity,
            int spinnerId) {
        super(midiManager, activity, spinnerId, TYPE_INPUT);
    }

    @Override
    public void onPortSelected(final MidiPortWrapper wrapper) {
        onClose();

        final MidiDeviceInfo info = wrapper.getDeviceInfo();
        if (info != null) {
            mMidiManager.openDevice(info, new MidiManager.OnDeviceOpenedListener() {
                    @Override
                public void onDeviceOpened(MidiDevice device) {
                    if (device == null) {
                        Log.e(TAG, "could not open " + info);
                    } else {
                        mOpenDevice = device;
                        mInputPort = mOpenDevice.openInputPort(
                                wrapper.getPortIndex());
                    }
                }
            }, new Handler(Looper.getMainLooper()));
        }
    }

    public MidiReceiver getReceiver() {
        return mInputPort;
    }

    @Override
    public void onClose() {
        try {
            if (mInputPort != null) {
                mInputPort.close();
            }
            mInputPort = null;
            if (mOpenDevice != null) {
                mOpenDevice.close();
            }
            mOpenDevice = null;
        } catch (IOException e) {
            Log.e(TAG, "cleanup failed", e);
        }
    }
}