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      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.midiscope;
     18 
     19 import android.media.midi.MidiDeviceInfo;
     20 import android.media.midi.MidiManager;
     21 import android.media.midi.MidiReceiver;
     22 import android.os.Bundle;
     23 import android.support.v7.app.ActionBar;
     24 import android.support.v7.app.AppCompatActivity;
     25 import android.support.v7.widget.Toolbar;
     26 import android.view.Menu;
     27 import android.view.MenuItem;
     28 import android.view.View;
     29 import android.view.WindowManager;
     30 import android.widget.ScrollView;
     31 import android.widget.TextView;
     32 
     33 import com.example.android.common.midi.MidiFramer;
     34 import com.example.android.common.midi.MidiOutputPortSelector;
     35 import com.example.android.common.midi.MidiPortWrapper;
     36 
     37 import java.util.LinkedList;
     38 
     39 /**
     40  * App that provides a MIDI echo service.
     41  */
     42 public class MainActivity extends AppCompatActivity implements ScopeLogger {
     43 
     44     private static final int MAX_LINES = 100;
     45 
     46     private final LinkedList<String> mLogLines = new LinkedList<>();
     47     private TextView mLog;
     48     private ScrollView mScroller;
     49     private MidiOutputPortSelector mLogSenderSelector;
     50 
     51     @Override
     52     public void onCreate(Bundle savedInstanceState) {
     53         super.onCreate(savedInstanceState);
     54         setContentView(R.layout.main);
     55 
     56         setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
     57         ActionBar actionBar = getSupportActionBar();
     58         if (actionBar != null) {
     59             actionBar.setDisplayShowTitleEnabled(false);
     60         }
     61 
     62         mLog = (TextView) findViewById(R.id.log);
     63         mScroller = (ScrollView) findViewById(R.id.scroll);
     64 
     65         // Setup MIDI
     66         MidiManager midiManager = (MidiManager) getSystemService(MIDI_SERVICE);
     67 
     68         // Receiver that prints the messages.
     69         MidiReceiver loggingReceiver = new LoggingReceiver(this);
     70 
     71         // Receiver that parses raw data into complete messages.
     72         MidiFramer connectFramer = new MidiFramer(loggingReceiver);
     73 
     74         // Setup a menu to select an input source.
     75         mLogSenderSelector = new MidiOutputPortSelector(midiManager, this, R.id.spinner_senders) {
     76             @Override
     77             public void onPortSelected(final MidiPortWrapper wrapper) {
     78                 super.onPortSelected(wrapper);
     79                 if (wrapper != null) {
     80                     mLogLines.clear();
     81                     MidiDeviceInfo deviceInfo = wrapper.getDeviceInfo();
     82                     if (deviceInfo == null) {
     83                         log(getString(R.string.header_text));
     84                     } else {
     85                         log(MidiPrinter.formatDeviceInfo(deviceInfo));
     86                     }
     87                 }
     88             }
     89         };
     90         mLogSenderSelector.getSender().connect(connectFramer);
     91 
     92         // Tell the virtual device to log its messages here..
     93         MidiScope.setScopeLogger(this);
     94     }
     95 
     96     @Override
     97     public void onDestroy() {
     98         mLogSenderSelector.onClose();
     99         // The scope will live on as a service so we need to tell it to stop
    100         // writing log messages to this Activity.
    101         MidiScope.setScopeLogger(null);
    102         super.onDestroy();
    103     }
    104 
    105     @Override
    106     public boolean onCreateOptionsMenu(Menu menu) {
    107         getMenuInflater().inflate(R.menu.main, menu);
    108         setKeepScreenOn(menu.findItem(R.id.action_keep_screen_on).isChecked());
    109         return true;
    110     }
    111 
    112     @Override
    113     public boolean onOptionsItemSelected(MenuItem item) {
    114         switch (item.getItemId()) {
    115             case R.id.action_clear_all:
    116                 mLogLines.clear();
    117                 logOnUiThread("");
    118                 break;
    119             case R.id.action_keep_screen_on:
    120                 boolean checked = !item.isChecked();
    121                 setKeepScreenOn(checked);
    122                 item.setChecked(checked);
    123                 break;
    124         }
    125         return super.onOptionsItemSelected(item);
    126     }
    127 
    128     private void setKeepScreenOn(boolean keepScreenOn) {
    129         if (keepScreenOn) {
    130             getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    131         } else {
    132             getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    133         }
    134     }
    135 
    136     @Override
    137     public void log(final String string) {
    138         runOnUiThread(new Runnable() {
    139             @Override
    140             public void run() {
    141                 logOnUiThread(string);
    142             }
    143         });
    144     }
    145 
    146     /**
    147      * Logs a message to our TextView. This needs to be called from the UI thread.
    148      */
    149     private void logOnUiThread(String s) {
    150         mLogLines.add(s);
    151         if (mLogLines.size() > MAX_LINES) {
    152             mLogLines.removeFirst();
    153         }
    154         // Render line buffer to one String.
    155         StringBuilder sb = new StringBuilder();
    156         for (String line : mLogLines) {
    157             sb.append(line).append('\n');
    158         }
    159         mLog.setText(sb.toString());
    160         mScroller.fullScroll(View.FOCUS_DOWN);
    161     }
    162 }
    163