Want it to generate random character instead of random numbers. Here is the code so far

Output required:

MainActivity

import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.IBinder; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private Button btnStart, btnStop, btnBind, btnUnbind, btnGetNumber; private TextView myTV; private Intent serviceIntent; private RandomNumberService myService; private boolean isServiceBound; private ServiceConnection myServiceConnection; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); btnStart = (Button) findViewById(R.id.button); btnStop = (Button) findViewById(R.id.button2); btnBind = (Button) findViewById(R.id.button3); btnUnbind = (Button) findViewById(R.id.button4); btnGetNumber = (Button)findViewById(R.id.button5); myTV = (TextView)findViewById(R.id.textview); } public void onClick(View view) { switch (view.getId()){ case R.id.button: serviceIntent = new Intent(getApplicationContext(), RandomNumberService.class); startService(serviceIntent); break; case R.id.button2: //serviceIntent = new Intent(getApplicationContext(), RandomNumberService.class); stopService(serviceIntent); break; case R.id.button3: bindMyService(); break; case R.id.button4: unbindMyService(); break; case R.id.button5: setRandomNumber(); break; } } private void bindMyService() { if(myServiceConnection == null){ myServiceConnection = new ServiceConnection() { @Override public void onServiceConnected(ComponentName componentName, IBinder iBinder) { RandomNumberService.RandomNumberServiceBinder myServiceBinder = (RandomNumberService.RandomNumberServiceBinder)iBinder; myService = myServiceBinder.getService(); isServiceBound = true; } @Override public void onServiceDisconnected(ComponentName componentName) { isServiceBound = false; } }; } bindService(serviceIntent,myServiceConnection, Context.BIND_AUTO_CREATE); } private void unbindMyService() { if(isServiceBound) { unbindService(myServiceConnection); isServiceBound = false; } } private void setRandomNumber() { if(isServiceBound) myTV.setText("Random Number: " + myService.getRandomNumber()); else myTV.setText("Service is not bound."); } } 

RandomNumberService.java

 import android.app.Service; import android.content.Intent; import android.os.Binder; import android.os.IBinder; import android.support.annotation.IntDef; import android.support.annotation.Nullable; import android.util.Log; import java.util.Random; public class RandomNumberService extends Service { private int myRandomNumber; private boolean isRandomGeneratorOn; private final int MIN = 0; private final int MAX = 100; private final String TAG = "RandomNumber Service: "; class RandomNumberServiceBinder extends Binder{ public RandomNumberService getService() { return RandomNumberService.this; } } private IBinder myBinder = new RandomNumberServiceBinder(); @Override public int onStartCommand(Intent intent, int flags, int startId) { Log.i(TAG, "In OnStartCommand Thread ID is "+Thread.currentThread().getId()); isRandomGeneratorOn = true; new Thread(new Runnable() { @Override public void run() { startRandomGenerator(); } } ).start(); return START_STICKY; } private void startRandomGenerator() { while(isRandomGeneratorOn){ try { Thread.sleep(1000); if(isRandomGeneratorOn){ myRandomNumber = new Random().nextInt(MAX)+MIN; Log.i(TAG, "Thread ID is "+Thread.currentThread().getId() + ", Random number is "+myRandomNumber); } }catch(InterruptedException e) { Log.i(TAG, "Thread Interrupted."); } } } private void stopRandomGenerator() { isRandomGeneratorOn = false; } public int getRandomNumber() { return myRandomNumber; } @Override public void onDestroy() { super.onDestroy(); stopRandomGenerator(); Log.i(TAG, "Service Destroyed."); } @Nullable @Override public IBinder onBind(Intent intent) { Log.i(TAG, "In onBind ..."); return myBinder; } } 

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