Home | History | Annotate | Download | only in com.example.android.common.midi 
      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.common.midi;
     18 
     19 import android.app.Activity;
     20 import android.media.midi.MidiDevice;
     21 import android.media.midi.MidiDeviceInfo;
     22 import android.media.midi.MidiInputPort;
     23 import android.media.midi.MidiManager;
     24 import android.media.midi.MidiReceiver;
     25 import android.os.Handler;
     26 import android.os.Looper;
     27 import android.util.Log;
     28 
     29 import java.io.IOException;
     30 
     31 /**
     32  * Manages a Spinner for selecting a MidiInputPort.
     33  */
     34 public class MidiInputPortSelector extends MidiPortSelector {
     35 
     36     private MidiInputPort mInputPort;
     37     private MidiDevice mOpenDevice;
     38 
     39     /**
     40      * @param midiManager
     41      * @param activity
     42      * @param spinnerId ID from the layout resource
     43      */
     44     public MidiInputPortSelector(MidiManager midiManager, Activity activity,
     45             int spinnerId) {
     46         super(midiManager, activity, spinnerId, MidiDeviceInfo.PortInfo.TYPE_INPUT);
     47     }
     48 
     49     @Override
     50     public void onPortSelected(final MidiPortWrapper wrapper) {
     51         close();
     52         final MidiDeviceInfo info = wrapper.getDeviceInfo();
     53         if (info != null) {
     54             mMidiManager.openDevice(info, new MidiManager.OnDeviceOpenedListener() {
     55                     @Override
     56                 public void onDeviceOpened(MidiDevice device) {
     57                     if (device == null) {
     58                         Log.e(MidiConstants.TAG, "could not open " + info);
     59                     } else {
     60                         mOpenDevice = device;
     61                         mInputPort = mOpenDevice.openInputPort(
     62                                 wrapper.getPortIndex());
     63                         if (mInputPort == null) {
     64                             Log.e(MidiConstants.TAG, "could not open input port on " + info);
     65                         }
     66                     }
     67                 }
     68             }, null);
     69             // Don't run the callback on the UI thread because openInputPort might take a while.
     70         }
     71     }
     72 
     73     public MidiReceiver getReceiver() {
     74         return mInputPort;
     75     }
     76 
     77     @Override
     78     public void onClose() {
     79         try {
     80             if (mInputPort != null) {
     81                 Log.i(MidiConstants.TAG, "MidiInputPortSelector.onClose() - close port");
     82                 mInputPort.close();
     83             }
     84             mInputPort = null;
     85             if (mOpenDevice != null) {
     86                 mOpenDevice.close();
     87             }
     88             mOpenDevice = null;
     89         } catch (IOException e) {
     90             Log.e(MidiConstants.TAG, "cleanup failed", e);
     91         }
     92     }
     93 }
     94