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.MidiManager;
23 import android.media.midi.MidiOutputPort;
24 import android.media.midi.MidiSender;
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 MidiOutputPort.
33  */
34 public class MidiOutputPortSelector extends MidiPortSelector {
35     private MidiOutputPort mOutputPort;
36     private MidiDispatcher mDispatcher = new MidiDispatcher();
37     private MidiDevice mOpenDevice;
38 
39     /**
40      * @param midiManager
41      * @param activity
42      * @param spinnerId ID from the layout resource
43      */
MidiOutputPortSelector(MidiManager midiManager, Activity activity, int spinnerId)44     public MidiOutputPortSelector(MidiManager midiManager, Activity activity,
45             int spinnerId) {
46         super(midiManager, activity, spinnerId, MidiDeviceInfo.PortInfo.TYPE_OUTPUT);
47     }
48 
49     @Override
onPortSelected(final MidiPortWrapper wrapper)50     public void onPortSelected(final MidiPortWrapper wrapper) {
51         Log.i(MidiConstants.TAG, "onPortSelected: " + wrapper);
52         close();
53 
54         final MidiDeviceInfo info = wrapper.getDeviceInfo();
55         if (info != null) {
56             mMidiManager.openDevice(info, new MidiManager.OnDeviceOpenedListener() {
57 
58                     @Override
59                 public void onDeviceOpened(MidiDevice device) {
60                     if (device == null) {
61                         Log.e(MidiConstants.TAG, "could not open " + info);
62                     } else {
63                         mOpenDevice = device;
64                         mOutputPort = device.openOutputPort(wrapper.getPortIndex());
65                         if (mOutputPort == null) {
66                             Log.e(MidiConstants.TAG,
67                                     "could not open output port for " + info);
68                             return;
69                         }
70                         mOutputPort.connect(mDispatcher);
71                     }
72                 }
73             }, null);
74             // Don't run the callback on the UI thread because openOutputPort might take a while.
75         }
76     }
77 
78     @Override
onClose()79     public void onClose() {
80         try {
81             if (mOutputPort != null) {
82                 mOutputPort.disconnect(mDispatcher);
83             }
84             mOutputPort = 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     /**
95      * You can connect your MidiReceivers to this sender. The user will then select which output
96      * port will send messages through this MidiSender.
97      * @return a MidiSender that will send the messages from the selected port.
98      */
getSender()99     public MidiSender getSender() {
100         return mDispatcher.getSender();
101     }
102 
103 }
104