MainActivity.java

package com.example.mohamed.blue11;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;


public class MainActivity extends ActionBarActivity {

    private Button bluetooth;
    private Button wifi;
    private Button internet3G;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_layout);

        bluetooth = (Button) findViewById(R.id.btnBluetooth);
        wifi = (Button) findViewById(R.id.btnWifi);
        internet3G = (Button) findViewById(R.id.btnInternet3G);

        bluetooth.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent bluetooth = new Intent(getApplicationContext(),Bluetooth.class);
                startActivity(bluetooth);
            }
        });

        wifi.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(getApplicationContext(), Wifi.class);
                startActivity(i);
            }
        });

        internet3G.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //Intent i = new Intent(getApplicationContext(), Internet3G.class);
                //startActivity(i);
            }
        });
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            this.finish();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}