Saturday, 27 April 2013

Alarm Service in android

Here we are setting the time to 10 seconds so after 10 seconds a Toast pops up.
For receiving the Broadcast we have to create a class the extends the BroadcastReceiver class on which the onReceive function gets called when the service ends
main.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:padding="4dip"
    android:gravity="center_horizontal"
    android:layout_width="fill_parent" android:layout_height="fill_parent">

    <TextView
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:layout_weight="0"
        android:paddingBottom="4dip"
        android:text="Alarm Demo"/>

    <Button android:id="@+id/one_shot"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:text="Start Alarm">
        <requestFocus />
    </Button>
</LinearLayout>

AndroidManifest :

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.hb"
    android:versionCode="1"
    android:versionName="1.0" >
    <application
        android:icon="@drawable/icon"
        android:label="@string/app_name" >
        <activity
            android:name=".AlarmDemo"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <receiver
            android:name=".MyAlarmReceiver"
            android:process=":remote" />
    </application>

</manifest>


MyAlarmReceiver.class
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class MyAlarmReceiver extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
Toast.makeText(context, "Alarm Received after 10 seconds.", Toast.LENGTH_SHORT).show();
    }
}

AlarmDemo.class
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class AlarmDemo extends Activity {
       Toast mToast;
       @Override
       protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.main);

              Button button = (Button)findViewById(R.id.one_shot);
              button.setOnClickListener(mOneShotListener);

       }
       private OnClickListener mOneShotListener = new OnClickListener() {
              public void onClick(View v) {

                     Intent intent = new Intent(AlarmDemo.this,MyAlarmReceiver.class);
                     PendingIntent sender = PendingIntent.getBroadcast(AlarmDemo.this,
                                  0, intent, 0);

                     // We want the alarm to go off 10 seconds from now.
                     Calendar calendar = Calendar.getInstance();
                     calendar.setTimeInMillis(System.currentTimeMillis());
                     calendar.add(Calendar.SECOND, 10);

                     // Schedule the alarm!
                     AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
                     am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);

                     // Tell the user about what we did.
                     if (mToast != null) {
                           mToast.cancel();
                     }
                     mToast = Toast.makeText(AlarmDemo.this,"Alarm Started",
                                  Toast.LENGTH_LONG);
                     mToast.show();
              }
       };
}