Mostly i am a server guy. But i had a dream to learn and write android applications. Fortunately i got a chance to write an application recently. it was for my friend. A single screen application for a demo to open and close gate via Bluetooth.
He gave me a Bluetooth module and an arduino micro controller for testing.
* Bluetooth module(sunrom.com)
* Bluetooth module connected to arduino
I learned anroid application development from offical documentaion(http://developer.android.com/training/index.html).
There is a pretty cool Bluetooth interfacing API in android http://developer.android.com/guide/topics/connectivity/bluetooth.html
There is only a single activity, because it was a single screen app. Source code is available on the github (https://github.com/faisalp4p/GateRunnr). Code is self explanatory, i am putting some code here.
public class ControllerActivity extends ActionBarActivity {
protected BluetoothAdapter ba;
private Set<BluetoothDevice> pairedDevices;
private BluetoothSocket sock;
private OutputStream bt_stream;
private BluetoothDevice device_to_connect;
private byte[] OPEN_SIGNAL;
private byte[] CLOSE_SIGNAL;
private byte[] STOP_SIGNAL;
int REQUEST_ENABLE_BT = 0;
boolean bluetooth_denied = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
device_to_connect = null;
bt_stream = null;
sock = null;
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_controller);
getSupportActionBar().hide();
Typeface roboto_thin = Typeface.createFromAsset(getAssets(), "fonts/Roboto-Thin.ttf");
Button open_button = (Button)findViewById(R.id.open_button);
Button close_button = (Button)findViewById(R.id.close_button);
Button stop_button = (Button)findViewById(R.id.stop);
open_button.setTypeface(roboto_thin);
close_button.setTypeface(roboto_thin);
stop_button.setTypeface(roboto_thin);
TextView header = (TextView)findViewById(R.id.header);
TextView sub_header = (TextView)findViewById(R.id.sub_header);
Typeface pirulen = Typeface.createFromAsset(getAssets(), "fonts/pirulen.ttf");
header.setTypeface(pirulen);
sub_header.setTypeface(pirulen);
OPEN_SIGNAL = "o".getBytes();
CLOSE_SIGNAL = "c".getBytes();
STOP_SIGNAL = "s".getBytes();
}
@Override
public void onResume() {
super.onResume();
ba = BluetoothAdapter.getDefaultAdapter(); //getting bluetooth adapter
if (ba == null) {
//Device not support bluetooth
Toast.makeText(getApplication(), "Device not support bluetooth", Toast.LENGTH_LONG).show();
}
if (!ba.isEnabled()) {
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
else {
if (!bluetooth_denied)
setupConnection();
}
}
public void setupConnection() {
pairedDevices = ba.getBondedDevices();
for(BluetoothDevice bt: pairedDevices) {
if(bt.getName().equals("linvor")) { // replace "linvor" with your bluetooth name
device_to_connect = bt;
System.out.println("Linvor found");
break;
}
}
if (device_to_connect != null) {
try {
sock = device_to_connect.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));
} catch (IOException e) {
Toast.makeText(getApplication(), "Socket cannot create", Toast.LENGTH_LONG).show();
System.out.println("Socket creation failed");
sock = null;
//sock cannot create
}
if (sock != null) {
ba.cancelDiscovery();
try {
sock.connect();
System.out.println("Socket connection established");
bt_stream = sock.getOutputStream();
} catch (IOException e) {
System.out.println("Socket connection cannot create");
Toast.makeText(getApplication(), "blue tooth connot connect", Toast.LENGTH_LONG).show();
System.out.println(e.toString());
//hello
}
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_ENABLE_BT) {
if(resultCode == RESULT_OK) {
setupConnection();
}
if(resultCode == RESULT_CANCELED) {
bluetooth_denied = true;
Toast.makeText(getApplication(), "Please enable bluetooth", Toast.LENGTH_LONG).show();
finish();
}
}
}
@Override
public void onPause() {
super.onStop();
if (sock != null) {
if (sock.isConnected()) {
try {
sock.close();
} catch (IOException e) {
System.out.println("Socket cannot close " + e.toString());
}
}
bt_stream = null;
}
}
@Override
public void onStop() {
super.onStop();
if (sock != null) {
if (sock.isConnected()) {
try {
sock.close();
} catch (IOException e) {
System.out.println("Socket cannot close " + e.toString());
}
}
bt_stream = null;
}
}
public void openClicked(View v) {
if (sock != null) {
if(sock.isConnected()) {
try {
bt_stream.write(OPEN_SIGNAL);
System.out.println("Open signal send");
} catch (IOException e) {
System.out.println("IO error in socket " + e.toString());
}
}
}
//Toast.makeText(getApplication(), "Open Clicked", Toast.LENGTH_LONG).show();
}
public void closeClicked(View v) {
if (sock != null) {
if(sock.isConnected()) {
try {
bt_stream.write(CLOSE_SIGNAL);
} catch (IOException e) {
System.out.println("IO error in socket " + e.toString());
}
}
}
}
public void onStopSignal(View v) {
if (sock != null) {
if(sock.isConnected()) {
try {
bt_stream.write(STOP_SIGNAL);
} catch (IOException e) {
System.out.println("IO error in socket " + e.toString());
}
}
}
}
}
Out of Context 