Help_Fragment.java

package edu.cs4730.btDemo;

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.
		}
	};

}