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bindService.java

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public class LocalService extends Service {

// Binder given to clients

private final IBinder mBinder = new LocalBinder();

// Random number generator

private final Random mGenerator = new Random();

/**

* Class used for the client Binder. Because we know this service always

* runs in the same process as its clients, we don't need to deal with IPC.

*/

public class LocalBinder extends Binder {

LocalService getService() {

// Return this instance of LocalService so clients can call public methods

return LocalService.this;

}

}

@Override

public IBinder onBind(Intent intent) {

return mBinder;

}

/** method for clients */

public int getRandomNumber() {

return mGenerator.nextInt(100);

}

}

//start service

public class BindingActivity extends Activity {

LocalService mService;

boolean mBound = false;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

}

@Override

protected void onStart() {

super.onStart();

// Bind to LocalService

Intent intent = new Intent(this, LocalService.class);

bindService(intent, mConnection, Context.BIND_AUTO_CREATE);

}

@Override

protected void onStop() {

super.onStop();

// Unbind from the service

if (mBound) {

unbindService(mConnection);

mBound = false;

}

}

/** Called when a button is clicked (the button in the layout file attaches to

* this method with the android:onClick attribute) */

public void onButtonClick(View v) {

if (mBound) {

// Call a method from the LocalService.

// However, if this call were something that might hang, then this request should

// occur in a separate thread to avoid slowing down the activity performance.

int num = mService.getRandomNumber();

Toast.makeText(this, "number: " + num, Toast.LENGTH_SHORT).show();

}

}

/** Defines callbacks for service binding, passed to bindService() */

private ServiceConnection mConnection = new ServiceConnection() {

@Override

public void onServiceConnected(ComponentName className,

IBinder service) {

// We've bound to LocalService, cast the IBinder and get LocalService instance

LocalBinder binder = (LocalBinder) service;

mService = binder.getService();

mBound = true;

}

@Override

public void onServiceDisconnected(ComponentName arg0) {

mBound = false;

}

};

}