Android Open Source - Fast Heart Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.fast.heart;
//from w w w  .  ja  v a2 s.  c  o  m
import android.app.Fragment;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

import com.example.fast.R;

/**
 * 
 * Fragment that displays all heartrate information to the user, when shown.
 *
 */
public class HeartFragment extends Fragment{
  
private static final int HR_CHECK_INTERVAL =  5000; //  5 seconds (default)
  
  private int heartRate = 0;
  private String heartRateString;
  
  private HxmBluetoothHelper hxmHelper;
  private Handler alertHandler;

  // Text Views
  private TextView connectionStatusText;
  private TextView heartRateText;
  private TextView instantSpeedText;
  private TextView batteryText;
  // Buttons
  private Button connectButton;
  private Button disconnectButton;
  
  //Timer
  private Handler mHandler = new Handler();
  private long startTime = 0, currentTime = 0;
  /**
   * REFRESH_RATE defines how often we should update the timer to show how much time has elapsed.
   * refresh every 100 milliseconds
   */
  private final int REFRESH_RATE = 500;
  MediaPlayer mPlayer;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  
        View rootView = inflater.inflate(R.layout.fragment_heart, container, false);
          
        return rootView;
    }
    
    @Override
    public void onActivityCreated(Bundle savedInstanceState){
      super.onActivityCreated(savedInstanceState);
      
    connectionStatusText = (TextView) this.getActivity().findViewById(R.id.connection_status);
    connectionStatusText.setText(R.string.disconnect);
    connectButton = (Button) this.getActivity().findViewById(R.id.connect);
    connectButton.setOnClickListener(onConnectListener);
    disconnectButton = (Button) this.getActivity().findViewById(R.id.disconnect);
    disconnectButton.setOnClickListener(onDisconnectListener);
    findViews();
    
    hxmHelper = new HxmBluetoothHelper(this.getActivity(), dataHandler);

    alertHandler = new Handler();
    }
    
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setRetainInstance(true);
  }
  
  private void findViews()
  {
    connectionStatusText = (TextView) this.getActivity().findViewById(R.id.connection_status);
    heartRateText        = (TextView) this.getActivity().findViewById(R.id.heart_rate);
    instantSpeedText     = (TextView) this.getActivity().findViewById(R.id.instant_speed);
    batteryText = (TextView) this.getActivity().findViewById(R.id.battery);

    connectButton    = (Button) this.getActivity().findViewById(R.id.connect);
    disconnectButton = (Button) this.getActivity().findViewById(R.id.disconnect);
  }

  OnClickListener onConnectListener = new OnClickListener()
  {
    public void onClick(View v)
    {
      hxmHelper.connect();
      
      heartRateText.setText(R.string.heart_rate_zero);
      instantSpeedText.setText(R.string.instant_speed_zero);

      if (hxmHelper.isConnected())
      {
        String statusConnected = HeartFragment.this.getResources().getString(R.string.connect);
        connectionStatusText.setText(statusConnected + ' ' +  hxmHelper.getDevice().getName());

        startTime = System.currentTimeMillis();
        mHandler.removeCallbacks(startTimer);
        mHandler.postDelayed(startTimer, REFRESH_RATE);
      }
      else
      {
        connectionStatusText.setText(R.string.status_unable_to_connect);
      }
    }
  };

  private OnClickListener onDisconnectListener = new OnClickListener()
  {
    public void onClick(View v)
    {
      // Disconnect from the HxM Device
      if(hxmHelper.isConnected()){
        
        hxmHelper.disconnect();
        connectionStatusText.setText(R.string.status_disconnected);
      }
    }
  };

  private final Handler dataHandler = new Handler()
  {
    @Override
    public void handleMessage(Message msg)
    {
      switch (msg.what)
      {

      case HxmBluetoothHelper.MESSAGE_INSTANT_SPEED:
        String instantSpeed = msg.getData().getString(HxmBluetoothHelper.DATA_INSTANT_SPEED);
        instantSpeedText.setText(instantSpeed);
        Log.d("HeartMonitor", "Instaneous speed is " + instantSpeed);

        break;
        
      case HxmBluetoothHelper.MESSAGE_HEART_RATE:
        String heartRate2 = msg.getData().getString(HxmBluetoothHelper.DATA_HEART_RATE);
        heartRate = Integer.parseInt(heartRate2);
        heartRateString = heartRate2;
        heartRateText.setText(heartRate2);
        Log.d("HeartMonitor", "Heart rate is " + heartRate2);
        
        break;
        
      case HxmBluetoothHelper.MESSAGE_BATTERY:
        int battery = msg.getData().getInt(HxmBluetoothHelper.DATA_BATTERY);
        batteryText.setText(Integer.toString(battery));
        Log.d("HeartMonitor", "Battery is " + battery);
        
        break;
      }
    }
  };
  
  public String getHeart(){
    if(heartRateString != null){
      return heartRateString;
    }
    else return "0.0";
  }
  public TextView getConnection(){
    return connectionStatusText;
  }

    /**
     * Converts the elapsed given time and updates the display
     * 
     * @param time the time to update the current display to
     */
    private void updateTimer (long time){


    //Convert the milliseconds,seconds,minutes,hours to String and format to ensure it has a leading zero when required
      Integer seconds = (int) ((time/1000));
    Integer minutes = seconds / 60;
    Integer hours = minutes / 60;
    
    seconds = seconds % 60;
    minutes = minutes % 60;
    String hoursString = leadingZero(hours);
    String minutesString = leadingZero(minutes);
    String secondsString = leadingZero(seconds);
    
    String concat = hoursString + ":" + minutesString + ":" + secondsString;

    String msString = String.valueOf(time % 360000);
    Character msChar = msString.charAt(msString.length() -3);
  }
    
    private String leadingZero(Integer n) {
    
      return n > 9 ? n.toString() : "0" + n.toString(); 
  }

  /**
     * Create a Runnable startTimer that makes timer runnable.
     */
    private Runnable startTimer = new Runnable() {
         public void run() {
           currentTime = System.currentTimeMillis() - startTime;
           updateTimer(currentTime);
           mHandler.postDelayed(this, REFRESH_RATE);
           if(hxmHelper.isConnected() && (heartRate < 50 || heartRate > 80)){
             //mPlayer.start();
             Log.d("HeartRateTry", "Measured" + heartRate);
           }
        }
      };

}

Java Source Code List

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