There are total 3 ways to bind a service with application components
- Using IBinder class
- Using Messanger class
- 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>
