content: /*
   * 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.midiscope;
  
  import android.media.midi.MidiDeviceInfo;
  import android.media.midi.MidiManager;
  import android.media.midi.MidiReceiver;
  import android.os.Bundle;
  import android.support.v7.app.ActionBar;
  import android.support.v7.app.AppCompatActivity;
  import android.support.v7.widget.Toolbar;
  import android.view.Menu;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.WindowManager;
  import android.widget.ScrollView;
  import android.widget.TextView;
  
  import com.example.android.common.midi.MidiFramer;
  import com.example.android.common.midi.MidiOutputPortSelector;
  import com.example.android.common.midi.MidiPortWrapper;
  
  import java.util.LinkedList;
  
  /**
   * App that provides a MIDI echo service.
   */
  public class MainActivity extends AppCompatActivity implements ScopeLogger {
  
      private static final int MAX_LINES = 100;
  
      private final LinkedList<String> mLogLines = new LinkedList<>();
      private TextView mLog;
      private ScrollView mScroller;
      private MidiOutputPortSelector mLogSenderSelector;
  
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.main);
  
          setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
          ActionBar actionBar = getSupportActionBar();
          if (actionBar != null) {
              actionBar.setDisplayShowTitleEnabled(false);
          }
  
          mLog = (TextView) findViewById(R.id.log);
          mScroller = (ScrollView) findViewById(R.id.scroll);
  
          // Setup MIDI
          MidiManager midiManager = (MidiManager) getSystemService(MIDI_SERVICE);
  
          // Receiver that prints the messages.
          MidiReceiver loggingReceiver = new LoggingReceiver(this);
  
          // Receiver that parses raw data into complete messages.
          MidiFramer connectFramer = new MidiFramer(loggingReceiver);
  
          // Setup a menu to select an input source.
          mLogSenderSelector = new MidiOutputPortSelector(midiManager, this, R.id.spinner_senders) {
              @Override
              public void onPortSelected(final MidiPortWrapper wrapper) {
                  super.onPortSelected(wrapper);
                  if (wrapper != null) {
                      mLogLines.clear();
                      MidiDeviceInfo deviceInfo = wrapper.getDeviceInfo();
                      if (deviceInfo == null) {
                          log(getString(R.string.header_text));
                      } else {
                          log(MidiPrinter.formatDeviceInfo(deviceInfo));
                      }
                  }
              }
          };
          mLogSenderSelector.getSender().connect(connectFramer);
  
          // Tell the virtual device to log its messages here..
          MidiScope.setScopeLogger(this);
      }
  
      @Override
      public void onDestroy() {
          mLogSenderSelector.onClose();
          // The scope will live on as a service so we need to tell it to stop
          // writing log messages to this Activity.
          MidiScope.setScopeLogger(null);
          super.onDestroy();
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          getMenuInflater().inflate(R.menu.main, menu);
          setKeepScreenOn(menu.findItem(R.id.action_keep_screen_on).isChecked());
          return true;
      }
  
      @Override
      public boolean onOptionsItemSelected(MenuItem item) {
          switch (item.getItemId()) {
              case R.id.action_clear_all:
                  mLogLines.clear();
                  logOnUiThread("");
                  break;
              case R.id.action_keep_screen_on:
                  boolean checked = !item.isChecked();
                  setKeepScreenOn(checked);
                  item.setChecked(checked);
                  break;
          }
          return super.onOptionsItemSelected(item);
      }
  
      private void setKeepScreenOn(boolean keepScreenOn) {
          if (keepScreenOn) {
              getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
          } else {
              getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
          }
      }
  
      @Override
      public void log(final String string) {
          runOnUiThread(new Runnable() {
              @Override
              public void run() {
                  logOnUiThread(string);
              }
          });
      }
  
      /**
       * Logs a message to our TextView. This needs to be called from the UI thread.
       */
      private void logOnUiThread(String s) {
          mLogLines.add(s);
          if (mLogLines.size() > MAX_LINES) {
              mLogLines.removeFirst();
          }
          // Render line buffer to one String.
          StringBuilder sb = new StringBuilder();
          for (String line : mLogLines) {
              sb.append(line).append('\n');
          }
          mLog.setText(sb.toString());
          mScroller.fullScroll(View.FOCUS_DOWN);
      }
  }
  