Creating Service

We can use Android Binder to communicate between apps. We need to create  a service on the provider side and use Android Interface Definition Language (AIDL) to communicate with it

Example AIDL:

package com.example.myservicelib;


interface IMyService
{
	int add(int a,int b);
	int sub(int a,int b);
	int mul(int a,int b,int c);
	int sum(in int []arr);
}

Service Code

package com.example.service1;

import android.os.RemoteException;

import com.example.myservicelib.IMyService;

public class ServiceImp extends IMyService.Stub{

	@Override
	public int mul(int a, int b,int c) throws RemoteException {
		// TODO Auto-generated method stub
		return a*b*c;
	}
	
	@Override
	public int add(int a, int b) throws RemoteException {
		// TODO Auto-generated method stub
		return a+b;
	}

	@Override
	public int sub(int a, int b) throws RemoteException {
		// TODO Auto-generated method stub
		return a-b;
	}

	@Override
	public int sum(int[] arg0) throws RemoteException {
		// TODO Auto-generated method stub
		return 0;
	}

}

And the Service class:

package com.example.service1;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class MyService extends Service{

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		return new ServiceImp();
	}

}

Manifest File

<service android:name=".MyService">
            <intent-filter >
                <action android:name="com.example.service1.MyService" />
            </intent-filter>
</service>

Client Code

package com.example.myclient;

import com.example.myservicelib.IMyService;

import android.os.Bundle;
import android.os.IBinder;
import android.os.RemoteException;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements ServiceConnection {

	IMyService myservice;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		
		Button b=(Button)findViewById(R.id.button1);
		b.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				try {
					int res=myservice.add(33, 44);
					Toast.makeText(MainActivity.this, "res="+res, Toast.LENGTH_LONG).show();
				} catch (RemoteException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		});
	}

	@Override
	protected void onStart() {
		// TODO Auto-generated method stub
		super.onStart();
		bindService(new Intent("com.example.service1.MyService"), this, BIND_AUTO_CREATE);
	}



	@Override
	public void onServiceConnected(ComponentName name, IBinder service) {
		// TODO Auto-generated method stub
		myservice = IMyService.Stub.asInterface(service);
		
	}

	@Override
	public void onServiceDisconnected(ComponentName name) {
		// TODO Auto-generated method stub
		
	}

}