Skip to content

Most visited

Recently visited

navigation
MidiSynth / src / com.example.android.common.midi /

MidiOutputPortSelector.java

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
     */
44
    public MidiOutputPortSelector(MidiManager midiManager, Activity activity,
45
            int spinnerId) {
46
        super(midiManager, activity, spinnerId, MidiDeviceInfo.PortInfo.TYPE_OUTPUT);
47
    }
48
 
49
    @Override
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
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
     */
99
    public MidiSender getSender() {
100
        return mDispatcher.getSender();
101
    }
102
 
103
}
This site uses cookies to store your preferences for site-specific language and display options.

Get the latest Android developer news and tips that will help you find success on Google Play.

* Required Fields

Hooray!

Follow Google Developers on WeChat

Browse this site in ?

You requested a page in , but your language preference for this site is .

Would you like to change your language preference and browse this site in ? If you want to change your language preference later, use the language menu at the bottom of each page.

This class requires API level or higher

This doc is hidden because your selected API level for the documentation is . You can change the documentation API level with the selector above the left navigation.

For more information about specifying the API level your app requires, read Supporting Different Platform Versions.

Take a short survey?
Help us improve the Android developer experience.
(Sep 2017 survey)