MainActivity.java

package in.justrobotics.jrbluetoothcontrol;

import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.InputType;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import java.util.UUID;

import me.aflak.bluetooth.Bluetooth;
import me.aflak.bluetooth.BluetoothCallback;
import me.aflak.bluetooth.DiscoveryCallback;

public class MainActivity extends AppCompatActivity {

    Bluetooth bluetooth;
    private ArrayAdapter<String> mBTArrayAdapter;
    String address,name;

    public void composeEmail(String message) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setType("*/*");
        intent.putExtra(android.content.Intent.EXTRA_EMAIL,new String[] { "shlokj@gmail.com" });
        intent.putExtra(Intent.EXTRA_SUBJECT, "Would like to get in touch");
        intent.putExtra(Intent.EXTRA_TEXT, message);
        if (intent.resolveActivity(getPackageManager()) != null) {
            startActivity(intent);
        }
    }


    public void sendEmail () {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Send a message: ");
        final EditText input = new EditText(this);
        input.setInputType(InputType.TYPE_CLASS_TEXT);
        builder.setView(input);
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                final String Message = input.getText().toString();
                composeEmail(Message);
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });
        builder.show();
    }

    public void displayPairedDevices(){
        BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
        for (BluetoothDevice device : pairedDevices)
            mBTArrayAdapter.add(device.getName() + "\n" + device.getAddress());

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(MainActivity.this);
        LayoutInflater inflater = getLayoutInflater();
        View convertView = (View) inflater.inflate(R.layout.dialog_btdevices, null);
        alertDialog.setView(convertView);
        alertDialog.setTitle("Select your device");
        alertDialog.setMessage("A JR Bluetooth device name is of the form JR_X");
        ListView devicesListView = (ListView) convertView.findViewById(R.id.mDevicesListView);
        devicesListView.setAdapter(mBTArrayAdapter);
        devicesListView.setOnItemClickListener(mDeviceClickListener);
        alertDialog.show();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bluetooth = new Bluetooth(getApplicationContext());
        bluetoothOn();
        if (bluetooth.isEnabled()) {
            displayPairedDevices();
        }
        mBTArrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);
        List<BluetoothDevice> devices = new ArrayList<BluetoothDevice>();
        if (bluetooth==null){
            Toast.makeText(getApplicationContext(),"Bluetooth null",Toast.LENGTH_SHORT).show();
        }
        if (bluetooth!=null){
            Toast.makeText(getApplicationContext(),"Bluetooth not null",Toast.LENGTH_SHORT).show();
        }

        Button openController = (Button) findViewById(R.id.open_controller);
        openController.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent startController = new Intent(MainActivity.this,ControllerActivity.class);
                startController.putExtra("ADDRESS",address);
                startActivity(startController);
            }
        });
        Button openAccelController = (Button) findViewById(R.id.open_accel_controller);
        openAccelController.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent startControllerAccel = new Intent(MainActivity.this,AccelerometerControl.class);
                startActivity(startControllerAccel);
            }
        });

        bluetooth.setBluetoothCallback(new BluetoothCallback() {
            @Override
            public void onBluetoothTurningOn() {
            }

            @Override
            public void onBluetoothOn() {
                Toast.makeText(getBaseContext(), "onBluetoothOn", Toast.LENGTH_SHORT).show();
                displayPairedDevices();
            }

            @Override
            public void onBluetoothTurningOff() {

            }

            @Override
            public void onBluetoothOff() {

            }

            @Override
            public void onUserDeniedActivation() {

            }
        });
        bluetooth.setDiscoveryCallback(new DiscoveryCallback() {
            @Override public void onDiscoveryStarted() {}
            @Override public void onDiscoveryFinished() {}
            @Override public void onDeviceFound(BluetoothDevice device) {}
            @Override public void onDevicePaired(BluetoothDevice device) {}
            @Override public void onDeviceUnpaired(BluetoothDevice device) {}
            @Override public void onError(String message) {}
        });
    }

    private AdapterView.OnItemClickListener mDeviceClickListener = new AdapterView.OnItemClickListener() {
        public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {

            String connectStatus="";
            if (!BluetoothAdapter.getDefaultAdapter().isEnabled()) {
                Toast.makeText(getBaseContext(), "Bluetooth not on", Toast.LENGTH_SHORT).show();
                return;
            }
            String info = ((TextView) v).getText().toString();
            address = info.substring(info.length() - 17);
            Toast.makeText(getBaseContext(), address, Toast.LENGTH_SHORT).show();
            name = info.substring(0, info.length() - 17);

            if (bluetooth.isConnected()){
                connectStatus="Connected";
            }
            if (!bluetooth.isConnected()){
                connectStatus="Not connected";
            }

//            Toast.makeText(getBaseContext(), connectStatus, Toast.LENGTH_SHORT).show();
//            bluetooth.connectToAddress(address);
//            Toast.makeText(getBaseContext(), "Connected (hopefully)", Toast.LENGTH_SHORT).show();
//            bluetooth.send("test");
//            Toast.makeText(getBaseContext(), "Sent data (hopefully)", Toast.LENGTH_SHORT).show();
        }};

    @Override
    protected void onStart() {
        super.onStart();
        bluetooth.onStart();
        bluetooth.enable();
    }

    @Override
    protected void onStop() {
        super.onStop();
        bluetooth.onStop();
    }

    private void bluetoothOn(){
        if (!BluetoothAdapter.getDefaultAdapter().isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, 1);
            Toast.makeText(getApplicationContext(),"Bluetooth turned on",Toast.LENGTH_SHORT).show();
        }
        else{
            bluetooth = new Bluetooth(getApplicationContext());
            mBTArrayAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1);
            displayPairedDevices();
        }
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 1){
            Log.d("Working:", "Bluetooth enabled");
            Toast.makeText(this, "Bluetooth enabled", Toast.LENGTH_SHORT).show();
        }
    }

}