Android Jobscheduler :
Android Jobscheduler, Android app’s have wide range of features to give the user a rich and easy to use UI providing all the android in built services to the users.Also for the developers extending their new features put forth in every new release of their software development kit’s Android SDK’s.
Android app’s will work in background (android background service) state to listen to broadcast messages, push services and many other features which extends the app functionality.Like wise there comes up with a job scheduling software i.e., API called Jobscheduler.
Android jobscheduler is a much efficient way of dealing with the things.It will provide a wake lock for the app in default way providing the guarantee that device stays awake until the job is finished. Also it provides a better battery efficiency which is a prime point in any app.
activity_main.xml
As this tutorial deals with Android JobScheduler UI is a simple one. Just two buttons to start and stop the job scheduler.
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" android:orientation="vertical"> <Button android:id="@+id/btn_start" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Start Service"/> <Button android:id="@+id/btn_stop" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Stop Service"/> </LinearLayout>
MyJobScheduler.java
Add up a Android Jobscheduler, a jobscheduler starts from this class where we can find the methods which will start and stop the job.
Let us see the methods
This method deals with the job start where also we can initialize our MyJobExecutor.java class so that we can execute our task as the job starts.
@Override
public boolean onStartJob(final JobParameters params) {
return false;
}
To make it easy to understand i have displayed a small message on the start of the job. Which will get displayed as a Toast message.In onPostExecute method inside onStartJob method as
@Override
public boolean onStartJob(final JobParameters params) {
jobExecutor = new MyJobExecutor() {
@Override
protected void onPostExecute(String str) {
Toast.makeText(MyJobScheduler.this, str, Toast.LENGTH_SHORT).show();
jobFinished(params,false);
}
};
jobExecutor.execute();
return true;
}
And when job is started there should also be a method to stop it
@Override
public boolean onStopJob(JobParameters params) {
jobExecutor.cancel(true);
return false;
}
Full class code :
Providing the full code for Android Jobscheduler
import android.app.job.JobParameters;
import android.widget.Toast;
public class MyJobScheduler extends android.app.job.JobService {
private MyJobExecutor jobExecutor;
@Override
public boolean onStartJob(final JobParameters params) {
jobExecutor = new MyJobExecutor() {
@Override
protected void onPostExecute(String str) {
Toast.makeText(MyJobScheduler.this, str, Toast.LENGTH_SHORT).show();
jobFinished(params,false);
}
};
jobExecutor.execute();
return true;
}
@Override
public boolean onStopJob(JobParameters params) {
jobExecutor.cancel(true);
return false;
}
}
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