| /* |
| * 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.MidiDeviceInfo; |
| import android.media.midi.MidiDeviceStatus; |
| import android.media.midi.MidiManager; |
| import android.media.midi.MidiManager.DeviceCallback; |
| import android.os.Handler; |
| import android.os.Looper; |
| import android.util.Log; |
| import android.view.View; |
| import android.widget.AdapterView; |
| import android.widget.ArrayAdapter; |
| import android.widget.Spinner; |
| |
| import java.util.HashSet; |
| |
| /** |
| * Base class that uses a Spinner to select available MIDI ports. |
| */ |
| public abstract class MidiPortSelector extends DeviceCallback { |
| private int mType = MidiDeviceInfo.PortInfo.TYPE_INPUT; |
| protected ArrayAdapter<MidiPortWrapper> mAdapter; |
| protected HashSet<MidiPortWrapper> mBusyPorts = new HashSet<MidiPortWrapper>(); |
| private Spinner mSpinner; |
| protected MidiManager mMidiManager; |
| protected Activity mActivity; |
| private MidiPortWrapper mCurrentWrapper; |
| |
| /** |
| * @param midiManager |
| * @param activity |
| * @param spinnerId |
| * ID from the layout resource |
| * @param type |
| * TYPE_INPUT or TYPE_OUTPUT |
| */ |
| public MidiPortSelector(MidiManager midiManager, Activity activity, |
| int spinnerId, int type) { |
| mMidiManager = midiManager; |
| mActivity = activity; |
| mType = type; |
| mAdapter = new ArrayAdapter<MidiPortWrapper>(activity, |
| android.R.layout.simple_spinner_item); |
| mAdapter.setDropDownViewResource( |
| android.R.layout.simple_spinner_dropdown_item); |
| mAdapter.add(new MidiPortWrapper(null, 0, 0)); |
| |
| mSpinner = (Spinner) activity.findViewById(spinnerId); |
| mSpinner.setOnItemSelectedListener( |
| new AdapterView.OnItemSelectedListener() { |
| |
| public void onItemSelected(AdapterView<?> parent, View view, |
| int pos, long id) { |
| mCurrentWrapper = mAdapter.getItem(pos); |
| onPortSelected(mCurrentWrapper); |
| } |
| |
| public void onNothingSelected(AdapterView<?> parent) { |
| onPortSelected(null); |
| mCurrentWrapper = null; |
| } |
| }); |
| mSpinner.setAdapter(mAdapter); |
| |
| mMidiManager.registerDeviceCallback(this, |
| new Handler(Looper.getMainLooper())); |
| |
| MidiDeviceInfo[] infos = mMidiManager.getDevices(); |
| for (MidiDeviceInfo info : infos) { |
| onDeviceAdded(info); |
| } |
| } |
| |
| /** |
| * Set to no port selected. |
| */ |
| public void clearSelection() { |
| mSpinner.setSelection(0); |
| } |
| |
| private int getInfoPortCount(final MidiDeviceInfo info) { |
| int portCount = (mType == MidiDeviceInfo.PortInfo.TYPE_INPUT) |
| ? info.getInputPortCount() : info.getOutputPortCount(); |
| return portCount; |
| } |
| |
| @Override |
| public void onDeviceAdded(final MidiDeviceInfo info) { |
| int portCount = getInfoPortCount(info); |
| for (int i = 0; i < portCount; ++i) { |
| MidiPortWrapper wrapper = new MidiPortWrapper(info, mType, i); |
| mAdapter.add(wrapper); |
| Log.i(MidiConstants.TAG, wrapper + " was added"); |
| mAdapter.notifyDataSetChanged(); |
| } |
| } |
| |
| @Override |
| public void onDeviceRemoved(final MidiDeviceInfo info) { |
| int portCount = getInfoPortCount(info); |
| for (int i = 0; i < portCount; ++i) { |
| MidiPortWrapper wrapper = new MidiPortWrapper(info, mType, i); |
| MidiPortWrapper currentWrapper = mCurrentWrapper; |
| mAdapter.remove(wrapper); |
| // If the currently selected port was removed then select no port. |
| if (wrapper.equals(currentWrapper)) { |
| clearSelection(); |
| } |
| mAdapter.notifyDataSetChanged(); |
| Log.i(MidiConstants.TAG, wrapper + " was removed"); |
| } |
| } |
| |
| @Override |
| public void onDeviceStatusChanged(final MidiDeviceStatus status) { |
| // If an input port becomes busy then remove it from the menu. |
| // If it becomes free then add it back to the menu. |
| if (mType == MidiDeviceInfo.PortInfo.TYPE_INPUT) { |
| MidiDeviceInfo info = status.getDeviceInfo(); |
| Log.i(MidiConstants.TAG, "MidiPortSelector.onDeviceStatusChanged status = " + status |
| + ", mType = " + mType |
| + ", activity = " + mActivity.getPackageName() |
| + ", info = " + info); |
| // Look for transitions from free to busy. |
| int portCount = info.getInputPortCount(); |
| for (int i = 0; i < portCount; ++i) { |
| MidiPortWrapper wrapper = new MidiPortWrapper(info, mType, i); |
| if (!wrapper.equals(mCurrentWrapper)) { |
| if (status.isInputPortOpen(i)) { // busy? |
| if (!mBusyPorts.contains(wrapper)) { |
| // was free, now busy |
| mBusyPorts.add(wrapper); |
| mAdapter.remove(wrapper); |
| mAdapter.notifyDataSetChanged(); |
| } |
| } else { |
| if (mBusyPorts.remove(wrapper)) { |
| // was busy, now free |
| mAdapter.add(wrapper); |
| mAdapter.notifyDataSetChanged(); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * Implement this method to handle the user selecting a port on a device. |
| * |
| * @param wrapper |
| */ |
| public abstract void onPortSelected(MidiPortWrapper wrapper); |
| |
| /** |
| * Implement this method to clean up any open resources. |
| */ |
| public abstract void onClose(); |
| |
| /** |
| * |
| */ |
| public void close() { |
| onClose(); |
| } |
| } |