Android Open Source - bluetooth Help_ Fragment

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License

The source code is released under:

Apache License

Java Source Code

package edu.cs4730.btDemo;
/*w w  w .  j  a v  a 2  s .com*/
import java.util.Set;

import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Message;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

/**
 * A simple {@link Fragment} subclass.
 * 
 */
public class Help_Fragment extends Fragment {
  
  /**
   * This is for the button call backs to launch the server or client fragment.
   */
  private Callbacks mCallbacks = sDummyCallbacks;
  /**
   * A callback interface that all activities containing this fragment must
   * implement. This mechanism allows activities to be notified of item
   * selections.
   */
  public interface Callbacks {
    /**
     * Callback for when an item has been selected.
     */
    public void onButtonSelected(int id);
  }
  
  
  //bluetooth device and code to turn the device on if needed.
  BluetoothAdapter mBluetoothAdapter =null;
  private static final int REQUEST_ENABLE_BT = 2;
  Button btn_client, btn_server;
  TextView logger;
  
  public Help_Fragment() {
    // Required empty public constructor
  }

  //A simple method to append data to the logger textview.
  //so I don't have to think about it in the code.
    public void mkmsg(String msg) {
       logger.append(msg + "\n");
    }
  
  
  //This code will check to see if there is a bluetooth device and
  //turn it on if is it turned off.
    public void startbt() {
      mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
      if (mBluetoothAdapter == null) {
          // Device does not support Bluetooth
          mkmsg ("This device does not support bluetooth");
          return;
      }
      //make sure bluetooth is enabled.
       if (!mBluetoothAdapter.isEnabled()) {
         mkmsg ("There is bluetooth, but turned off");
           Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
           startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
       } else {
         mkmsg ("The bluetooth is ready to use.");
         //bluetooth is on, so list paired devices from here.
         querypaired();
       }
    }

    /*
     * This method will query the bluetooth device and ask for a list of all
     * paired devices.  It will then display to the screen the name of the device and the address
     *   In client fragment we need this address to so we can connect to the bluetooth device that is acting as the server.
     */
    
    public void querypaired() {
      mkmsg("Paired Devices:");
      Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
      // If there are paired devices
      if (pairedDevices.size() > 0) {
          // Loop through paired devices
        final BluetoothDevice blueDev[] = new BluetoothDevice[pairedDevices.size()];
        String item;
        int i =0;
        for (BluetoothDevice devicel : pairedDevices) {
          blueDev[i] = devicel;
            item = blueDev[i].getName() + ": " + blueDev[i].getAddress();
            mkmsg("Device: "+item);
            i++;
          }

      } else {
        mkmsg("There are no paired devices");
      }
    }
    
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View myView = inflater.inflate(R.layout.fragment_help, container, false);
    logger = (TextView) myView.findViewById(R.id.logger1);
    
    
    btn_client = (Button)myView.findViewById(R.id.button2);
    btn_client.setOnClickListener( new View.OnClickListener(){
      @Override
      public void onClick(View v) {
        mCallbacks.onButtonSelected(2);
      }
    });
    btn_server = (Button)myView.findViewById(R.id.button1);
    btn_server.setOnClickListener( new View.OnClickListener(){
      @Override
      public void onClick(View v) {
        mCallbacks.onButtonSelected(1);
      }
    });
    
    startbt();

    return myView;
  }
  
  
  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_ENABLE_BT) {
      //bluetooth result code.
      if (resultCode == Activity.RESULT_OK) {
        mkmsg("Bluetooth is on.");
        querypaired();
      } else {
        mkmsg("Please turn the bluetooth on.");
      }
    }
  }

  
  /*
   * This is all for the callbacks.
   * 
   */
  @Override
  public void onAttach(Activity activity) {
    super.onAttach(activity);
    // Activities containing this fragment must implement its callbacks.
    if (!(activity instanceof Callbacks)) {
      throw new IllegalStateException(
          "Activity must implement fragment's callbacks.");
    }
    mCallbacks = (Callbacks) activity;
  }
  @Override
  public void onDetach() {
    super.onDetach();
    // Reset the active callbacks interface to the dummy implementation.
    mCallbacks = sDummyCallbacks;
  }
  /**
   * A dummy implementation of the {@link Callbacks} interface that does
   * nothing. Used only when this fragment is not attached to an activity.
   */
  private static Callbacks sDummyCallbacks = new Callbacks() {
    @Override
    public void onButtonSelected(int id) {
      ; //nothing, this is dummy method.
    }
  };

}

Java Source Code List

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