Android Open Source - meu-android-sdk Me U

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License

The source code is released under:

MIT License

Java Source Code

package com.ankitguglani;
//from w  w  w . j a va2  s  .c  o  m
import java.util.ArrayList;

import android.bluetooth.BluetoothAdapter;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.util.Log;
//import android.widget.Toast;
import cc.arduino.btserial.BtSerial;

/**
 * This acts a basic SDK for building android applications for the MeU, wearable LED platform.
 * @author Ankit Guglani
 * @version 0.0.2
 */
public class MeU {
  BtSerial bt;
  int i=0;
    
  /**
   * This method enables the user to connect to the MeU using bluetooth.
   * @author ankitg
   * @param context
   * @param remoteAddress
   */
  public void setupBluetooth (Context context, String remoteAddress)
  {
    BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (mBluetoothAdapter == null) {
        // Device does not support Bluetooth
      Log.e("meusdk","Device does not support Bluetooth");
//      Toast.makeText(context, "This device does not support Bluetooth.", Toast.LENGTH_SHORT).show();
    } else {
        if (mBluetoothAdapter.isEnabled()) {
            // Bluetooth is enabled
          
        if (bt == null) {
          bt = new BtSerial(context);
        }
        
        if(remoteAddress == null || remoteAddress.isEmpty() || remoteAddress.length() != 17)
        {
          Log.e("meusdk","Please ensure the SSID of the MeU is set correctly. " + remoteAddress.length());
//          Toast.makeText(context, "Please ensure the SSID of the MeU is set correctly.", Toast.LENGTH_SHORT).show();
        }
        else
        {
          if(bt.isConnected() && bt.getRemoteAddress().contains(remoteAddress))
          {
            Log.d("meusdk","Bluetooth connected to " + bt.getRemoteName());
//              Toast.makeText(context, "Connected to " + bt.getRemoteName(), Toast.LENGTH_SHORT).show();
          }
          else
          {
            if(i < 5)
            {
              bt.connect(remoteAddress);
              Log.e("meusdk","Attempting Bluetooth Connection: " + i);
              i++;
//                Toast.makeText(context, "Failed to connect to Bluetooth "+i+" times. Retrying ...", Toast.LENGTH_SHORT).show();
              setupBluetooth (context, remoteAddress);
            }
            else 
            {
              Log.e("meusdk","Failed to connect to Bluetooth after 5 retries. Giving up.");
//              Toast.makeText(context, "Failed to connect to Bluetooth. Giving up.", Toast.LENGTH_LONG).show();
              i=0;
            }
          }
        }
          
        } else {
          // Bluetooth is disabled
          Log.d("meusdk","Bluetooth is disabled. Please enable bluetooth.");
//          Toast.makeText(context, "Bluetooth is disabled. Please enable bluetooth.", Toast.LENGTH_SHORT).show();
        }
    }
  }

  private void sendMessage(String meuString) {
    if(bt != null && bt.isConnected())
    {
      bt.write(meuString);
      Log.d("meusdk","Data sent successfully.");
    }
    else
    {
      Log.e("meusdk","Bluetooth Connection failed.");
    }
  }
    
    private String bitmapToHexString(Bitmap bmp) {
      int w = 16; //bmp.getWidth();
      int h = 16; //bmp.getHeight();
      String hexString ="";
      
      Bitmap bmpScaled = Bitmap.createScaledBitmap(bmp, 16, 16, false);
      
      for (int y = 0; y < w; y++) { // width
        for (int x = 0; x < h; x++) { // height
              int color = bmpScaled.getPixel(x, y);
              
              int r = Color.red(color);
              int g = Color.green(color);
              int b = Color.blue(color);
              
              String hex = String.format("%02x%02x%02x", r, g, b).toUpperCase();
              hexString += hex;
        }
      }
      return hexString;
    }

    private String getMeuTextString(String text, String color) {
      if(color.isEmpty() || color == null || color.length() != 6) {
        color = "ffffff";
      }
      return "b"+color+text+"\r\n";
    }
    
    private String getMeuTextString(String text) {
      return getMeuTextString(text,"ffffff");
    }

    private String getMeuImageString(Bitmap bmp) {
      return "i"+bitmapToHexString(Bitmap.createScaledBitmap(bmp, 16, 16, false));
    }

    /**
     * This method enables the user to send text and color (as a hex code string) to be marqueed on the MeU
     * @author ankitg
     * @param text
     * @param color
     */
    public void sendText(String text, String color) {
      sendMessage(getMeuTextString(text, color));
    }

    /**
     * This method enables the user to send text to be marqueed on the MeU
     * @author ankitg
     * @param text
     */
    public void sendText(String text) {
      sendMessage(getMeuTextString(text));
    }

    /**
     * This method enables the user to send a bitmap to be displayed on the MeU
     * @author ankitg
     * @param bmp
     */
    public void sendImage(Bitmap bmp) {
      sendMessage(getMeuImageString(bmp));
    }

    /**
     * This method enables the user to send a raw string to be processed by the sketch currently loaded on the MeU
     * @author ankitg
     * @param text
     */
    public void sendRaw(String text) {
      sendMessage(text);
    }
    
    /**
     * This method exposes the list of available MeUs in the vicinity.
     * @author ankitg
     */
     public String[] listMeUs(Context context)
     {
//      String[] MeUList = new String[]{};
      ArrayList<String> MeUList = new ArrayList<String>();
       
     BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
     if (mBluetoothAdapter == null) {
         // Device does not support Bluetooth
       Log.e("meusdk","Device does not support Bluetooth");
//       Toast.makeText(context, "This device does not support Bluetooth.", Toast.LENGTH_SHORT).show();
     } else {
         if (mBluetoothAdapter.isEnabled()) {
             // Bluetooth is enabled
           
         if (bt == null) {
           bt = new BtSerial(context);
         }
         
         String[] BtDeviceList = bt.list();
         String filter = "00:06:66:6A:";
         
         for (String device : BtDeviceList)
         {
           if(device.startsWith(filter))
           {
             MeUList.add(device);
           }
         }
         
         }  else {
          // Bluetooth is disabled
          Log.d("meusdk","Bluetooth is disabled. Please enable bluetooth.");
//          Toast.makeText(context, "Bluetooth is disabled. Please enable bluetooth.", Toast.LENGTH_SHORT).show();
        }
     }
     
    return MeUList.toArray(new String[MeUList.size()]);
     }

//     /**
//      * This method exposes the list of available MeUs in the vicinity.
//      * @author ankitg
//      */
//      public void disconnectBt()
//      {
//        
//      BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
//      if (mBluetoothAdapter == null) {
//          // Device does not support Bluetooth
//        Log.e("meusdk","Device does not support Bluetooth");
//      } else {
//          if (mBluetoothAdapter.isEnabled()) {
//              // Bluetooth is enabled
//            
//          if (bt != null && bt.isConnected()) {
////          bt.disconnect(); // crashes the app :(
//            bt = null;
//          }
//          
//          }  else {
//           // Bluetooth is disabled
//           Log.d("meusdk","Bluetooth is disabled. Please enable bluetooth.");
//         }
//      }
//     }

      /**
       * This method exposes the current Bluetooth status.
       * @author ankitg
       */
       public String btStatus()
       {
         
       BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
       if (mBluetoothAdapter == null) {
           // Device does not support Bluetooth
         return ("Device does not support Bluetooth");
       } else {
           if (mBluetoothAdapter.isEnabled()) {
               // Bluetooth is enabled
           if (bt != null) {
             if (bt.isConnected())
             {
               return ("Connected to "+bt.getName());
             }
             else if(mBluetoothAdapter.isDiscovering())
             {
               return ("Scanning");
             }
             else
             {
               return ("Disconnected");
             }
           }
           return("Service not initialized. Please refresh.");
           
           }  else {
            // Bluetooth is disabled
            return("Bluetooth is disabled.");
          }
    }
  }
}

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