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MidiSynth / src / com.example.android.midisynth /

MainActivity.java

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/*
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 * Copyright (C) 2015 The Android Open Source Project
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 *      http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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package com.example.android.midisynth;
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import android.app.ActionBar;
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import android.app.Activity;
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import android.content.pm.PackageManager;
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import android.media.midi.MidiDevice.MidiConnection;
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import android.media.midi.MidiDeviceInfo;
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import android.media.midi.MidiManager;
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import android.os.Bundle;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.WindowManager;
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import android.widget.Toast;
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import android.widget.Toolbar;
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import com.example.android.common.midi.MidiOutputPortConnectionSelector;
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import com.example.android.common.midi.MidiPortConnector;
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import com.example.android.common.midi.MidiTools;
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/**
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 * Simple synthesizer as a MIDI Device.
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 */
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public class MainActivity extends Activity {
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    static final String TAG = "MidiSynthExample";
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    private MidiManager mMidiManager;
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    private MidiOutputPortConnectionSelector mPortSelector;
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    @Override
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    public void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.main);
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        setActionBar((Toolbar) findViewById(R.id.toolbar));
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        ActionBar actionBar = getActionBar();
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        if (actionBar != null) {
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            actionBar.setDisplayShowTitleEnabled(false);
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        }
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        if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_MIDI)) {
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            setupMidi();
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        }
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    }
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    @Override
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    public boolean onCreateOptionsMenu(Menu menu) {
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        getMenuInflater().inflate(R.menu.main, menu);
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        setKeepScreenOn(menu.findItem(R.id.action_keep_screen_on).isChecked());
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        return true;
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    }
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    @Override
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    public boolean onOptionsItemSelected(MenuItem item) {
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        switch (item.getItemId()) {
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            case R.id.action_keep_screen_on:
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                boolean checked = !item.isChecked();
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                setKeepScreenOn(checked);
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                item.setChecked(checked);
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                break;
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        }
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        return super.onOptionsItemSelected(item);
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    }
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    private void setKeepScreenOn(boolean keepScreenOn) {
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        if (keepScreenOn) {
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            getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
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        } else {
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            getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
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        }
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    }
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    private void setupMidi() {
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        // Setup MIDI
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        mMidiManager = (MidiManager) getSystemService(MIDI_SERVICE);
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        MidiDeviceInfo synthInfo = MidiTools.findDevice(mMidiManager, "AndroidTest",
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                "SynthExample");
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        int portIndex = 0;
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        mPortSelector = new MidiOutputPortConnectionSelector(mMidiManager, this,
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                R.id.spinner_synth_sender, synthInfo, portIndex);
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        mPortSelector.setConnectedListener(new MyPortsConnectedListener());
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    }
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    private void closeSynthResources() {
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        if (mPortSelector != null) {
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            mPortSelector.close();
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        }
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    }
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    // TODO A better way would be to listen to the synth server
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    // for open/close events and then disable/enable the spinner.
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    private class MyPortsConnectedListener
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            implements MidiPortConnector.OnPortsConnectedListener {
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        @Override
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        public void onPortsConnected(final MidiConnection connection) {
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            runOnUiThread(new Runnable() {
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                @Override
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                public void run() {
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                    if (connection == null) {
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                        Toast.makeText(MainActivity.this,
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                                R.string.error_port_busy, Toast.LENGTH_SHORT)
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                                .show();
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                        mPortSelector.clearSelection();
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                    } else {
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                        Toast.makeText(MainActivity.this,
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                                R.string.port_open_ok, Toast.LENGTH_SHORT)
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                                .show();
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                    }
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                }
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            });
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        }
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    }
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    @Override
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    public void onDestroy() {
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        closeSynthResources();
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        super.onDestroy();
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    }
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}
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