using IBinder class to Bind service

There are total 3 ways to bind a service with application components

1. Using IBinder class
2. Using Messanger class
3. Using AIDL

The life is a process of learning even after some bad happening we are going on and learning things. someone asked me about the Binding Services and i was unable to answer  and that after i tried to work on the same.

Create a project and have a main activity with Name MainActivity.

Implementing the Binder

to implement the binder creat a class SomeServic which extends Service class, i create an inner class with name LocalBinder which is inner class and inside SomeService.

package com.example.bindserviceusingbinderclass;

import java.text.SimpleDateFormat;
import java.util.Date;

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

public class SomeService extends Service {

IBinder mBinder = new LocalBinder();

@Override
public IBinder onBind(Intent intent) {
return mBinder;
}

public class LocalBinder extends Binder {
public SomeService getServerInstance() {
return SomeService.this;
}
}

public String getTime() {
SimpleDateFormat mDateFormat = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
return mDateFormat.format(new Date());
}
}

finally we need to start service at Mainactivity

Binding the Client to the Service

package com.example.bindserviceusingbinderclass;

import com.example.bindserviceusingbinderclass.SomeService.LocalBinder;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.app.Activity;

import android.content.ComponentName;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.IBinder;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

boolean mBounded;

SomeService mServer;

TextView text;

Button button;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

text = (TextView) findViewById(R.id.text);

button = (Button) findViewById(R.id.button);

button.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

text.setText(mServer.getTime());

}

});

}

@Override

protected void onStart() {

super.onStart();

Intent mIntent = new Intent(this, SomeService.class);

bindService(mIntent, mConnection, BIND_AUTO_CREATE);

};

ServiceConnection mConnection = new ServiceConnection() {

public void onServiceDisconnected(ComponentName name) {

Toast.makeText(MainActivity.this, "Service is disconnected", 1000).show();

mBounded = false;

mServer = null;

}

public void onServiceConnected(ComponentName name, IBinder service) {

Toast.makeText(MainActivity.this, "Service is connected", 1000).show();

mBounded = true;

LocalBinder mLocalBinder = (LocalBinder) service;

mServer = mLocalBinder.getServerInstance();

}

};

@Override

protected void onStop() {

super.onStop();

if (mBounded) {

unbindService(mConnection);

mBounded = false;

}

};

@Override

protected void onDestroy() {

super.onStop();

if (mBounded) {

unbindService(mConnection);

mBounded = false;

}

};

}

do not forget to work with manifest for the service.

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.bindserviceusingbinderclass"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="17" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.example.bindserviceusingbinderclass.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <service android:name=".SomeService" />

    </application>

    

</manifest>

the activity_main.xml looks like

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/text"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" />

    <Button

        android:id="@+id/button"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/text"

        android:layout_below="@+id/text"

        android:layout_marginLeft="36dp"

        android:layout_marginTop="54dp"

        android:text="Button" />

</RelativeLayout>