Bluetooth for Android and Arduino HC-05 Module, Java implementation

Here's a concise instructional video on how to use Android mobile telephone to control Arduino microcontroller using HC-05 bluetooth adapter. The programming language that I used is Java in Android Studio.

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Here is the code for Android:
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package net.bane.bluetoothapplication;

import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;

public class MainActivity extends AppCompatActivity {

static final UUID mUUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
System.out.println(btAdapter.getBondedDevices());

BluetoothDevice hc05 = btAdapter.getRemoteDevice("00:21:13:02:B6:5B");
System.out.println(hc05.getName());

BluetoothSocket btSocket = null;
int counter = 0;
do {
try {
btSocket = hc05.createRfcommSocketToServiceRecord(mUUID);
System.out.println(btSocket);
btSocket.connect();
System.out.println(btSocket.isConnected());
} catch (IOException e) {
e.printStackTrace();
}
counter++;
} while (!btSocket.isConnected() && counter ＜ 3);


try {
OutputStream outputStream = btSocket.getOutputStream();
outputStream.write(48);
} catch (IOException e) {
e.printStackTrace();
}

InputStream inputStream = null;
try {
inputStream = btSocket.getInputStream();
inputStream.skip(inputStream.available());

for (int i = 0; i ＜ 26; i++) {

byte b = (byte) inputStream.read();
System.out.println((char) b);

}

} catch (IOException e) {
e.printStackTrace();
}


try {
btSocket.close();
System.out.println(btSocket.isConnected());
} catch (IOException e) {
e.printStackTrace();
}


}
}
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Note: Youtube does not allow angled brackets in the description, so I used the big angle bracket (＜) character instead. Please replace with the regular less-than sign.