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