Android Programming Tutorials 20 : Services Exampel In Android

Services Example:

In This Tutorial we will see how Services will execute;



OUT PUT Of The Tutorial:

Create Android Application:

• File >> New >> Android Application
• Enter Project name: ServicesApp
• Package: com.ambilpursunil.newapp
• Keep other default selections, click Next until you reach Finish

                               

 1.Simply Copy and Past the Code which is display below in the  MainActivity.java 

package com.ambilpursunil.newapp;

import android.app.Activity;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.IBinder;

import android.os.Message;

import android.os.Messenger;

import android.os.RemoteException;

import android.view.Menu;

import android.view.View;

import android.widget.Toast;

    public class MainActivity extends Activity {

    

                 boolean status = false;

                Messenger mMessenger = null;

           

                @Override

                protected void onCreate(Bundle savedInstanceState) {

                super.onCreate(savedInstanceState);

                setContentView(R.layout.activity_main);

                }

                @Override

                public boolean onCreateOptionsMenu(Menu menu) {

     // Inflate the menu; this adds items to the action bar if it is present.

                getMenuInflater().inflate(R.menu.main, menu);

                return true;

                }

                public void startMethod(View v){

               if(status){

               Toast.makeText(getBaseContext(), "Service Already Started",                                          Toast.LENGTH_LONG).show();

               }else{           

               Intent i = new Intent(this, MyService.class);

               bindService(i, sc, Context.BIND_AUTO_CREATE);

              status = true;

 Toast.makeText(getBaseContext(), "Service Successfully Started",                                   Toast.LENGTH_LONG).show();

              }

              }

              public void stopMethod(View v){

              if(status){

              sc = null;

              status = false;

             Toast.makeText(getBaseContext(), "Service Stopped",                                                        Toast.LENGTH_LONG).show();

             }else{

             Toast.makeText(getBaseContext(), "Service Already Stopped",                                          Toast.LENGTH_LONG).show();

             }

             }

   

    public void invokeMethod(View v){

            if(status){               

            Message message = Message.obtain(null,1,0,0,0);

            String s = "This is the Message To the Client";

            Bundle bn = new Bundle();

            bn.putString("my_string", s);

            message.setData(bn);

            try {

            mMessenger.send(message);

           } catch (RemoteException e) {

           // TODO Auto-generated catch block

           e.printStackTrace();

           }

           }else{

           Toast.makeText(getBaseContext(), "Go and Start Service                                                  First",Toast.LENGTH_LONG).show();

           }

           }

           ServiceConnection sc = new ServiceConnection()  {

           @Override

           public void onServiceDisconnected(ComponentName name) {

           // TODO Auto-generated method stub

           Messenger = null;

           }

           @Overrid

public void onServiceConnected(ComponentName name, IBinder service) {

           // TODO Auto-generated method stub

           mMessenger = new Messenger(service);

           status = true;

           }

       };

}

2.Now Create Service class, right click on the src=>package=>New=>java class=>Name it as  MyService.java Copy and Past the below code:

package com.ambilpursunil.newapp;

import android.app.Service;

import android.content.Intent;

import android.os.Bundle;

import android.os.Handler;

import android.os.IBinder;

import android.os.Message;

import android.os.Messenger;

import android.widget.Toast;

public class MyService extends Service{

            static final int SAY_HELLO = 1;

           

            @Override

            public IBinder onBind(Intent intent) {

            // TODO Auto-generated method stub

            //This will return iBinder object to the client

            return messenger.getBinder();

            }

           

            class MessageHandler extends Handler{

            public void handleMessage(Message msg){

            switch(msg.what){

            case SAY_HELLO:

            Toast.makeText(getBaseContext(), "Hello From Service                                                     Class",Toast.LENGTH_LONG).show();

            Bundle bn = msg.getData();

            String message = bn.getString("my_string");

            Toast.makeText(getBaseContext(),                                                                                       "Message:"+message,Toast.LENGTH_LONG).show();

            break;

            

           default:

          super.handleMessage(msg);

           }

           }

           }

           Messenger messenger = new Messenger(new MessageHandler());

          }

3.Simple Copy and Past the below code:  actvitiy_main.xml

<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="com.ambilpursunil.newapp.MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="67dp"

        android:text="Strat Service"

        android:onClick="startMethod" />

    <Button

        android:id="@+id/button2"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_below="@+id/button1"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="20dp"

        android:text="Stop Service"

        android:onClick="stopMethod" />

    <Button

        android:id="@+id/button3"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="Invoke Service+"

        android:onClick="invokeMethod" />

</RelativeLayout>

4.Copy and past the code for  manifest.xml

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

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

    package="com.ambilpursunil.newapp"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

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

    </application>

</manifest>

5.Right click on the project and Run As-->Android Application

OUT PUT Of The Tutorial:

OutPut:

When our application launch it show three buttons  when you click on   Invoke Service+  Button you will get a Toast message like first go and start service  when you click on  Start Service  get a Toast Service is Successfully started  Now Click on    Invoke Service+  button again then it will show all the Toast messges Like. Hello for service class   and Message:This is the message to the client.

If you again click on Start Service  button the a Toast like service already started .

Finally Go and click on Stop Service  you get a Toast like Service Stopped.

Please Send Your Comments To ambilpura.sunil@gmail.com

Stay Tune For Next Tutorial... Services In Android: