Main

package com.receive.bluereceive;

import android.app.ActionBar;
import android.app.AlertDialog;
import android.app.FragmentTransaction;
import android.bluetooth.BluetoothAdapter;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;


public class Main extends android.support.v4.app.FragmentActivity implements ActionBar.TabListener {

    // Name of the connected device
    private String mConnectedDeviceName = null;
    /**
     * Default Bluetooth adapter on the device.
     */
    private final BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

    // Member object for Bluetooth Command Service
    //private BluetoothCommandService mCommandService = null;

    /**
     * Magic number used to request connection of the devices
     */
    private static final int REQUEST_CONNECT_DEVICE = 1;

    public final int BT_ENABLE_TIME = 35;

    public final int BT_TIME_BTTIME = 1000 * BT_ENABLE_TIME;

    public CountDownTimer BTCountDown;

    public final int REQUEST_ENABLE_BT = 2;

    private final static String PREFIX = "BT_";

    private final String TAG = Main.class.getName();

    AppSectionsPagerAdapter mAppSectionsPagerAdapter;

    ViewPager mViewPager;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);
        final ActionBar actionBar = getActionBar();
        actionBar.setHomeButtonEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        if(mBluetoothAdapter == null) {
            Log.e(TAG, "No Bluetooth Adapter available. Exiting...");
            this.finish();
        }

        mAppSectionsPagerAdapter = new AppSectionsPagerAdapter(getSupportFragmentManager());

        mViewPager = (ViewPager) findViewById(R.id.pager);
        mViewPager.setAdapter(mAppSectionsPagerAdapter);
        mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
            @Override
            public void onPageSelected(int position) {
                // When swiping between different app sections, select the corresponding tab.
                // We can also use ActionBar.Tab#select() to do this if we have a reference to the
                // Tab.
                actionBar.setSelectedNavigationItem(position);
            }
        });

        for (int i = 0; i < mAppSectionsPagerAdapter.getCount(); i++) {
            // Create a tab with text corresponding to the page title defined by the adapter.
            // Also specify this Activity object, which implements the TabListener interface, as the
            // listener for when this tab is selected.
            actionBar.addTab(
                    actionBar.newTab()
                            .setText(mAppSectionsPagerAdapter.getPageTitle(i))
                            .setTabListener(this));
        }

        // If the adapter is null, then Bluetooth is not supported
        if (mBluetoothAdapter == null) {
            Toast.makeText(this, "Bluetooth is not available", Toast.LENGTH_LONG).show();
            finish();
            return;
        }
    }

    protected void onStart() {
        super.onStart();
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivity(enableIntent);
            ((Button) findViewById(R.id.bt_server_start)).setEnabled(false);
            ((Button) findViewById(R.id.bt_server_stop)).setEnabled(false);
        }
    }

    protected void onPause() {
        super.onPause();
        ((Button) findViewById(R.id.bt_server_start)).setEnabled(false);
        ((Button) findViewById(R.id.bt_server_stop)).setEnabled(false);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu items for use in the action bar
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.option_menu, menu);


        return super.onCreateOptionsMenu(menu);
    }

    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case R.id.scan:
            // Launch the DeviceListActivity to see devices and do scan
            Intent serverIntent = new Intent(this, DeviceList.class);
            startActivity(serverIntent);
            return true;
        case R.id.discoverable:
            if (!mBluetoothAdapter.getName().startsWith(PREFIX))
                mBluetoothAdapter.setName(PREFIX + mBluetoothAdapter.getName());
            if(mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
                BTDiscoverable();
            } else if (mBluetoothAdapter.getScanMode() == BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE)
                ((Button) findViewById(R.id.bt_server_start)).setEnabled(true);
            return true;
        }
        return false;
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        if (requestCode == REQUEST_ENABLE_BT)
        {
            if(resultCode != RESULT_CANCELED)
            {
                ((Button) findViewById(R.id.bt_server_start)).setEnabled(true);
                BTCountDown = new BTTimer(BT_TIME_BTTIME,BT_TIME_BTTIME);
                BTCountDown.start();
            }
        }
    }

    @Override
    public void onBackPressed() {
        new AlertDialog.Builder(this)
            .setTitle("Really Exit?")
            .setMessage("Are you sure you want to exit?")
            .setNegativeButton(android.R.string.no, null)
            .setPositiveButton(android.R.string.yes, new OnClickListener() {

                public void onClick(DialogInterface arg0, int arg1) {
                    Main.super.onBackPressed();
                }
            }).create().show();
    }

    public void BTDiscoverable() {
        Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, BT_ENABLE_TIME);
        startActivityForResult(discoverableIntent, REQUEST_ENABLE_BT);
    }

     @Override
    public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        }

        @Override
    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
            // When the given tab is selected, switch to the corresponding page in the ViewPager.
            mViewPager.setCurrentItem(tab.getPosition());
        }

        @Override
    public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        }

     public static class AppSectionsPagerAdapter extends FragmentPagerAdapter {

            public AppSectionsPagerAdapter(FragmentManager fm) {
                super(fm);
            }

            @Override
            public Fragment getItem(int i) {
                switch (i) {
                case 0:
                    // The first section of the app is the most interesting -- it offers
                    // a launchpad into the other demonstrations in this example application.
                    return new MainSectionFragment();

                case 1:
                    // The first section of the app is the most interesting -- it offers
                    // a launchpad into the other demonstrations in this example application.
                    return new ReceiveSectionFragment();

                case 2:
                    // The first section of the app is the most interesting -- it offers
                    // a launchpad into the other demonstrations in this example application.
                    return new SendSectionFragment();

                default:
                    // The other sections of the app are dummy placeholders.
                    return new MainSectionFragment();
                }
            }

            @Override
            public int getCount() {
                return 3;
            }

            @Override
            public CharSequence getPageTitle(int position) {
                int pos = position;
                switch (pos) {
                case 0:
                    return "Main";
                case 1:
                    return "Receive";
                case 2:
                    return "Send";
                default:
                    return "Section";
                }

            }
        }

     public static class MainSectionFragment extends Fragment {

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                    Bundle savedInstanceState) {
                View rootView = inflater.inflate(R.layout.main_activity, container, false);
                return rootView;
            }
        }

     public static class ReceiveSectionFragment extends Fragment {

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                    Bundle savedInstanceState) {
                View rootView = inflater.inflate(R.layout.receive, container, false);

                rootView.findViewById(R.id.bt_server_start)
                .setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        Intent intent = new Intent(getActivity(), Receive.class);
                        startActivity(intent);
                    }
                });

                return rootView;
            }
        }

     public static class SendSectionFragment extends Fragment {

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                    Bundle savedInstanceState) {
                View rootView = inflater.inflate(R.layout.send, container, false);
                return rootView;
            }
        }


     public class BTTimer extends CountDownTimer {
          public BTTimer (long startTime, long interval) {
           super(startTime, interval);
          }

          @Override
          public void onFinish() {
              ((Button) findViewById(R.id.bt_server_start)).setEnabled(false);
              ((Button) findViewById(R.id.bt_server_stop)).setEnabled(false);
          }

          @Override
          public void onTick(long millisUntilFinished) {

          }
    }

}