Friday, August 23, 2013

Background App Example in Android Programming

Manchu Bhargavi 3:33 AM , , No comments :
HI,

This example shows how you can minimize your activity and start a service and resume your activity whenever required.



Algorithm:
1.) Create a new project by File-> New -> Android Project name it BackgroundAppExample.
2) Write following into main.xml:


main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:padding="@dimen/padding_medium"
android:text="@string/hello_world"
tools:context=".BackgroundAppExample" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/textView1"
android:layout_marginRight="49dp"
android:layout_marginTop="74dp"
android:text="Start Service" />

</RelativeLayout>

3.) Write following into manifest file:

mainfest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.backgroundappexample"
android:versionCode="1"
android:versionName="1.0">

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity
android:name=".BackgroundAppExample"
android:label="@string/title_activity_background_app_example">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<service android:enabled="true"android:name=".BackgroundService"/>
</application>
</manifest>

4) Create and write following into src/BackgroundService.java:

BackgroundService.java:


package com.example.backgroundappexample;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.app.Service;

import android.content.Intent;

import android.os.Binder;

import android.os.Bundle;

import android.os.IBinder;

 
public class BackgroundService extends Service 
{


   
   private NotificationManager mNM;

    Bundle b;

    Intent notificationIntent;

    private final IBinder mBinder = new LocalBinder();

    private String newtext;

 
    public class LocalBinder extends Binder 

    {


   
      BackgroundService getService() 

  
{
            return BackgroundService.this;
        }
    }

 
    @Override


    public void onCreate() 

        mNM = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
 

        newtext = "BackGroundApp Service Running";

         
        Notification notification = new Notification(R.drawable.ic_launcher,

                   newtext,System.currentTimeMillis());

        PendingIntent contentIntent = PendingIntent.getActivity(BackgroundService.this, 0, new


              Intent(BackgroundService.this,   BackgroundAppExample.class), 0);



        notification.setLatestEventInfo(BackgroundService.this,"BackgroundAppExample", 


                        newtext, contentIntent);

        mNM.notify(R.string.local_service_started, notification);

        notificationIntent = new Intent(this, BackgroundAppExample.class);

        showNotification();    

    }

            
             public int onStartCommand(Intent intent, int flags, int startId)
 
           {


        return START_STICKY;

     }


    public void onDestroy()

          {


         

       mNM.cancel(R.string.local_service_started);


        stopSelf();

    }


    private void showNotification()


      {


        
         CharSequence text = getText(R.string.local_service_started);

      Notification notification = new Notification(R.drawable.ic_launcher, text,
   
        System.currentTimeMillis());


        PendingIntent contentIntent = PendingIntent.getActivity(this, 0,new Intent(this,

             BackgroundAppExample.class), 0);

        notification.setLatestEventInfo(this, "BackgroundAppExample",newtext, contentIntent);


        notification.flags = Notification.FLAG_ONGOING_EVENT | 

                  Notification.FLAG_NO_CLEAR;    


         notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |   


             Intent.FLAG_ACTIVITY_SINGLE_TOP);
 
        mNM.notify(R.string.local_service_started, notification);

    }

    @Override


    public IBinder onBind(Intent intent)


        {


      

        return mBinder;

    }

}

          



5)Open BackgroundAppExample.java file and write following code there:

BackgroundAppExample.java

package com.example.backgroundappexample;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class BackgroundAppExample extends Activity {

public static boolean isService = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button startserviceButton = (Button) findViewById(R.id.button1);
startserviceButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
startService(new Intent(BackgroundAppExample.this,BackgroundService.class));
Intent startMain = new Intent(Intent.ACTION_MAIN);
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startMain);
isService = true;
}
});
}

@Override
protected void onResume() {
super.onResume();
stopService(new Intent(BackgroundAppExample.this,
BackgroundService.class));
if(isService)
{
TextView tv = (TextView) findViewById(R.id.textView1);
tv.setText("Service Resumed");
isService = false;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}



6) Compile and build the project.



















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