{"id":106879,"date":"2020-09-24T07:00:00","date_gmt":"2020-09-24T04:00:00","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=106879"},"modified":"2020-09-23T16:48:04","modified_gmt":"2020-09-23T13:48:04","slug":"using-work-manager-in-android-with-example","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2020\/09\/using-work-manager-in-android-with-example.html","title":{"rendered":"Using Work Manager in Android with Example"},"content":{"rendered":"

In this post, we\u2019ll take a look at how to use the work manager in android<\/strong>. Work manager is a part of the android architecture components and is a good replacement of all the previous scheduling options.<\/p>\n

Other scheduling<\/strong> options such as JobScheduler, GcmNetworkManager etc. But they had their shortcomings. GcmNetworkManager required play services, so it won\u2019t work on some chinese OEMs and JobScheduler supported API > 21. <\/p>\n

But the work manager in android solves all of these problems and more, elegantly. It\u2019s by far one of the most easy to use APIs in Android. <\/p>\n

In this work manager example, we\u2019ll create an app to use Work Manager to download 3 images in the background and add them to a list.<\/p>\n

Warning:<\/strong> Work manager shouldn\u2019t be used for tasks such as downloading something on button click. It should only be used for DEFERRABLE tasks. But for the sake of simplicity I\u2019ve taken this example.<\/p>\n

Getting Started<\/b><\/h2>\n

Create a new Android Studio Project<\/b><\/h3>\n

I\u2019m going to name my project work manager demo. You can name it anything you want. Make sure to select an empty activity. We\u2019ll be writing everything from scratch.<\/p>\n

\n
\"\"<\/figure>\n<\/div>\n

Add dependency for Work Manager in Android<\/b><\/h3>\n

Let\u2019s add some dependencies. First and foremost for Work Manager. Then I\u2019ll add some extra dependencies for this example. It includes Picasso, Gson, and EventBus.<\/p>\n

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implementation <\/code>\"androidx.work:work-runtime-ktx:2.4.0\"<\/code><\/div>\n
implementation <\/code>'io.reactivex.rxjava2:rxkotlin:2.3.0'<\/code><\/div>\n
implementation <\/code>'com.google.code.gson:gson:2.8.5'<\/code><\/div>\n
implementation <\/code>'com.squareup.picasso:picasso:2.71828'<\/code><\/div>\n
implementation <\/code>'com.squareup.okhttp3:okhttp:3.13.1'<\/code><\/div>\n
implementation <\/code>'org.greenrobot:eventbus:3.1.1'<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

As of writing this article, the latest version is 2.4.0, you can find the latest version on developers.android.com. Or just search for work manager dependency and it\u2019ll be the first link.<\/p>\n

Structure of the app<\/b><\/h3>\n

The diagram below shows the basic flow of our app. Mainly we\u2019ll have a worker (which I\u2019ll explain in the following sections), an ImageUtil class to download images and our MainActivity to start the process.<\/p>\n

\u00a0<\/p>\n

\n
\"\"<\/figure>\n<\/div>\n

Using Work Manager in Android<\/b><\/h2>\n

Building the UI<\/b><\/h3>\n

The UI of this app will be very simple, it\u2019s a scrollview with 3 imageviews. And a button at the bottom to kick off the Work Manager.<\/p>\n

\n
\n\n\n\n
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<?xml version=<\/code>\"1.0\"<\/code> encoding=<\/code>\"utf-8\"<\/code>?><\/code><\/div>\n
<LinearLayout xmlns:android=<\/code>\"http:\/\/schemas.android.com\/apk\/res\/android<\/a>\"<\/code><\/div>\n
    <\/code>xmlns:app=<\/code>\"http:\/\/schemas.android.com\/apk\/res-auto<\/a>\"<\/code><\/div>\n
    <\/code>xmlns:tools=<\/code>\"http:\/\/schemas.android.com\/tools<\/a>\"<\/code><\/div>\n
    <\/code>android:layout_width=<\/code>\"match_parent\"<\/code><\/div>\n
    <\/code>android:layout_height=<\/code>\"match_parent\"<\/code><\/div>\n
    <\/code>android:orientation=<\/code>\"vertical\"<\/code><\/div>\n
    <\/code>tools:context=<\/code>\".MainActivity\"<\/code>><\/code><\/div>\n
 <\/div>\n
    <\/code><ScrollView<\/code><\/div>\n
        <\/code>android:layout_width=<\/code>\"match_parent\"<\/code><\/div>\n
        <\/code>android:layout_height=<\/code>\"0dp\"<\/code><\/div>\n
        <\/code>android:layout_weight=<\/code>\"1\"<\/code>><\/code><\/div>\n
 <\/div>\n
        <\/code><LinearLayout<\/code><\/div>\n
            <\/code>android:layout_width=<\/code>\"match_parent\"<\/code><\/div>\n
            <\/code>android:layout_height=<\/code>\"match_parent\"<\/code><\/div>\n
            <\/code>android:layout_weight=<\/code>\"1\"<\/code><\/div>\n
            <\/code>android:gravity=<\/code>\"center_horizontal\"<\/code><\/div>\n
            <\/code>android:orientation=<\/code>\"vertical\"<\/code>><\/code><\/div>\n
 <\/div>\n
            <\/code><ImageView<\/code><\/div>\n
                <\/code>android:id=<\/code>\"@+id\/iv_1\"<\/code><\/div>\n
                <\/code>android:layout_width=<\/code>\"300dp\"<\/code><\/div>\n
                <\/code>android:layout_height=<\/code>\"300dp\"<\/code><\/div>\n
                <\/code>android:layout_marginTop=<\/code>\"32dp\"<\/code><\/div>\n
                <\/code>android:scaleType=<\/code>\"fitXY\"<\/code> \/><\/code><\/div>\n
 <\/div>\n
            <\/code><ImageView<\/code><\/div>\n
                <\/code>android:id=<\/code>\"@+id\/iv_2\"<\/code><\/div>\n
                <\/code>android:layout_width=<\/code>\"300dp\"<\/code><\/div>\n
                <\/code>android:layout_height=<\/code>\"300dp\"<\/code><\/div>\n
                <\/code>android:layout_marginTop=<\/code>\"32dp\"<\/code><\/div>\n
                <\/code>android:scaleType=<\/code>\"fitXY\"<\/code> \/><\/code><\/div>\n
 <\/div>\n
            <\/code><ImageView<\/code><\/div>\n
                <\/code>android:id=<\/code>\"@+id\/iv_3\"<\/code><\/div>\n
                <\/code>android:layout_width=<\/code>\"300dp\"<\/code><\/div>\n
                <\/code>android:layout_height=<\/code>\"300dp\"<\/code><\/div>\n
                <\/code>android:layout_marginTop=<\/code>\"32dp\"<\/code><\/div>\n
                <\/code>android:scaleType=<\/code>\"fitXY\"<\/code> \/><\/code><\/div>\n
 <\/div>\n
        <\/code><\/LinearLayout><\/code><\/div>\n
    <\/code><\/ScrollView><\/code><\/div>\n
 <\/div>\n
 <\/div>\n
    <\/code><Button<\/code><\/div>\n
        <\/code>android:id=<\/code>\"@+id\/btn_download\"<\/code><\/div>\n
        <\/code>android:layout_width=<\/code>\"match_parent\"<\/code><\/div>\n
        <\/code>android:layout_height=<\/code>\"wrap_content\"<\/code><\/div>\n
        <\/code>android:layout_gravity=<\/code>\"bottom\"<\/code><\/div>\n
        <\/code>android:text=<\/code>\"Start Download\"<\/code> \/><\/code><\/div>\n
 <\/div>\n
<\/LinearLayout><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Adding the data for Images<\/b><\/h3>\n

Add the JSON provided below to the top of your MainActivity.kt file. This will contain a URL for the image to download.<\/p>\n

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\n
\n
val jsonString: String = <\/code>\"[\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"  {\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"albumId\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"id\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"title\\\": \\\"Eminem\\\",\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"url\\\": \\\"https:\/\/i.pinimg.com\/originals\/c4\/14\/4f\/c4144fba258c2f0b4735180fe5d9a03b.jpg<\/a>\\\",\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"thumbnailUrl\\\": \\\"https:\/\/via.placeholder.com\/150\/92c952<\/a>\\\"\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"  },\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"  {\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"albumId\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"id\\\": 2,\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"title\\\": \\\"MEME\\\",\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"url\\\": \\\"https:\/\/pics.me.me\/eminems-emotions-suprised-sad-happy-curious-annoyed-excited-shocked-bored-13877943.png<\/a>\\\",\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"thumbnailUrl\\\": \\\"https:\/\/via.placeholder.com\/150\/771796<\/a>\\\"\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"  },\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"  {\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"albumId\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"id\\\": 3,\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"title\\\": \\\"Eminem News\\\",\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"url\\\": \\\"https:\/\/www.sohh.com\/wp-content\/uploads\/Eminem.jpg<\/a>\\\",\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"    \\\"thumbnailUrl\\\": \\\"https:\/\/via.placeholder.com\/150\/24f355<\/a>\\\"\\n\"<\/code> +<\/code><\/div>\n
        <\/code>\"  }]\"<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Also, let\u2019s go ahead and add a click listener to the button. Upon clicking the button, we\u2019ll call a method startWorker()<\/b>. Now this is where the fun starts!<\/p>\n

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\n
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override fun onCreate(savedInstanceState: Bundle?) {<\/code><\/div>\n
    <\/code>super<\/code>.onCreate(savedInstanceState)<\/code><\/div>\n
    <\/code>setContentView(R.layout.activity_main)<\/code><\/div>\n
 <\/div>\n
    <\/code>btn_download.setOnClickListener {<\/code><\/div>\n
        <\/code>startWorker()<\/code><\/div>\n
    <\/code>}<\/code><\/div>\n
}<\/code><\/div>\n
 <\/div>\n
private<\/code> fun startWorker() {<\/code><\/div>\n
 <\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Passing Data to our Worker<\/b><\/h3>\n

The Work Manager takes a Worker which contains the task that we want to perform. What we\u2019ll do is, we\u2019ll pass the JSON to our worker which then would download all the images. <\/p>\n

To pass data in the work manager, we\u2019ve to use a special Data object provided by the Work Manager in android. Here\u2019 how to create the data object:<\/p>\n

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private<\/code> fun startWorker() {<\/code><\/div>\n
    <\/code>val data = Data.Builder()<\/code><\/div>\n
        <\/code>.putString(<\/code>\"images\"<\/code>, jsonString)<\/code><\/div>\n
        <\/code>.build()<\/code><\/div>\n
 <\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Data takes all the primitive types. Hence we use the putString method. <\/p>\n

Very Important: <\/strong>The limit for data is 10KB. If you try to pass things such as bitmap (by converting to Base64), it\u2019d fail. So be very cautious when passing data to the worker.<\/p>\n

Adding Constraints in Work Manager<\/b><\/h3>\n

Constraints are a very powerful feature of the work manager. It allows us to specify certain conditions which have to be met in order for work to start.<\/p>\n

If the conditions are not met, work will not be started no matter if we\u2019ve started the process in code.<\/p>\n

There\u2019s no guarantee that the work manager will start your work at the exact time. Hence tasks such as downloads should be done using DownloadManager in android. Use work manager for deferrable tasks only. For example: syncing logs in the background, taking backups of chat etc\u2026.<\/p>\n

To add constraints, all you need to do is build a constraint object using builder pattern as shown:<\/p>\n

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private<\/code> fun startWorker() {<\/code><\/div>\n
    <\/code>val data = Data.Builder()<\/code><\/div>\n
        <\/code>.putString(<\/code>\"images\"<\/code>, jsonString)<\/code><\/div>\n
        <\/code>.build()<\/code><\/div>\n
 <\/div>\n
    <\/code>val constraints = Constraints.Builder()<\/code><\/div>\n
        <\/code>.setRequiredNetworkType(NetworkType.CONNECTED)<\/code><\/div>\n
 <\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

You can specify many constraints such as: <\/p>\n

    \n
  1. Require device idle: Will trigger work only if the device is idle and not in use.<\/li>\n
  2. Require charging: Will trigger only if phone is plugged in for charging.<\/li>\n
  3. Battery not low: Requires battery to be at a certain level.<\/li>\n
  4. Storage not low: Storage should not be low<\/li>\n<\/ol>\n

    You can find all the constraints at: developer.android.com<\/a><\/p>\n

    Creating a OneTimeRequest for Work Manager<\/b><\/h2>\n

    We\u2019ll be creating a one time request. As the name suggests, it\u2019ll fire once and stop. If you want to schedule periodic tasks, consider using PreiodicWorkRequest.<\/b><\/p>\n

    Use the builder pattern from OneTimeRequest. Pass ImageDownloadWorker::class.java in the builder constructor. We\u2019ll be creating the worker in the next section.<\/p>\n

    Also pass the data and the constraints using the builder functions:<\/p>\n

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    		\n
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    private<\/code> fun startWorker() {<\/code><\/div>\n
        <\/code>val data = Data.Builder()<\/code><\/div>\n
            <\/code>.putString(<\/code>\"images\"<\/code>, jsonString)<\/code><\/div>\n
            <\/code>.build()<\/code><\/div>\n
     <\/div>\n
        <\/code>val constraints = Constraints.Builder()<\/code><\/div>\n
            <\/code>.setRequiredNetworkType(NetworkType.CONNECTED)<\/code><\/div>\n
     <\/div>\n
        <\/code>val oneTimeRequest = OneTimeWorkRequest.Builder(ImageDownloadWorker::<\/code>class<\/code>.java)<\/code><\/div>\n
            <\/code>.setInputData(data)<\/code><\/div>\n
            <\/code>.setConstraints(constraints.build())<\/code><\/div>\n
            <\/code>.addTag(<\/code>\"demo\"<\/code>)<\/code><\/div>\n
            <\/code>.build()<\/code><\/div>\n
     <\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    This creates our OneTimeRequest<\/strong>.<\/p>\n

    Starting the Work Manager<\/b><\/h3>\n

    Finally, we can start the worker as below:<\/p>\n

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    		\n
    \n
    private<\/code> fun startWorker() {<\/code><\/div>\n
        <\/code>val data = Data.Builder()<\/code><\/div>\n
            <\/code>.putString(<\/code>\"images\"<\/code>, jsonString)<\/code><\/div>\n
            <\/code>.build()<\/code><\/div>\n
     <\/div>\n
        <\/code>val constraints = Constraints.Builder()<\/code><\/div>\n
            <\/code>.setRequiredNetworkType(NetworkType.CONNECTED)<\/code><\/div>\n
     <\/div>\n
        <\/code>val oneTimeRequest = OneTimeWorkRequest.Builder(ImageDownloadWorker::<\/code>class<\/code>.java)<\/code><\/div>\n
            <\/code>.setInputData(data)<\/code><\/div>\n
            <\/code>.setConstraints(constraints.build())<\/code><\/div>\n
            <\/code>.addTag(<\/code>\"demo\"<\/code>)<\/code><\/div>\n
            <\/code>.build()<\/code><\/div>\n
     <\/div>\n
        <\/code>Toast.makeText(<\/code>this<\/code>, <\/code>\"Starting worker\"<\/code>, Toast.LENGTH_SHORT).show()<\/code><\/div>\n
     <\/div>\n
        <\/code>WorkManager.getInstance(<\/code>this<\/code>)<\/code><\/div>\n
            <\/code>.enqueueUniqueWork(<\/code>\"AndroidVille\"<\/code>, ExistingWorkPolicy.KEEP, oneTimeRequest)<\/code><\/div>\n
    }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

    We get an instance of the work manager and then enqueue the work. Pass a UNIQUE<\/strong> work name. This will be used to refer to the work in future. If you append another work with this work.

    <\/div> <\/div><\/p>\n

    Next we tell what ExistingPolicy<\/strong> to use. ExistingPolicy<\/strong> defines what will happen if a work with same name is already present.<\/p>\n

    There are 4 policies that can be used:<\/p>\n

      \n
    1. REPLACE: If a work already exists with the same name, replace it with this new work. Previous work will be stopped and deleted.<\/li>\n
    2. KEEP: If a work already exists with same name, do nothing. Original work will continue as it is.<\/li>\n
    3. APPEND: append the new work to already existing work.<\/li>\n
    4. APPEND_OR_REPLACE: If previous work failed, it\u2019ll create a new sequence, else it behaves like APPEND. <\/li>\n<\/ol>\n

      Finally we pass our request object. This will trigger the work manager and if conditions are met, it\u2019ll start the ImageDownloadWorker. Let\u2019s go ahead and create the worker.<\/p>\n

      Creating Worker for Work Manager in Android<\/b><\/h2>\n

      Our worker will do two things:<\/p>\n

        \n
      1. Download the images.<\/li>\n
      2. Display a notification for progress.<\/li>\n<\/ol>\n

        For creating the worker, create a class called ImageDownloadWorker.kt <\/b>and extend if from Worker.<\/p>\n

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        		\n
        \n
        class<\/code> ImageDownloadWorker(<\/code>private<\/code> val mContext: Context, workerParameters: WorkerParameters) :<\/code><\/div>\n
            <\/code>Worker(mContext, workerParameters) {<\/code><\/div>\n
         <\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        Implement the doWork<\/strong> method. This is where our work starts. First let\u2019s go ahead and implement the downloading.<\/p>\n

        \n
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        		\n
        \n
        class<\/code> ImageDownloadWorker(<\/code>private<\/code> val mContext: Context, workerParameters: WorkerParameters) :<\/code><\/div>\n
            <\/code>Worker(mContext, workerParameters) {<\/code><\/div>\n
         <\/div>\n
            <\/code>override fun doWork(): Result {<\/code><\/div>\n
         <\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        Downloading the images<\/b><\/h3>\n

        Get the JSON data you passed in the MainActivity using inputData.getString:<\/p>\n

        \n
        \n\n\n\n
        \n
        01<\/div>\n
        02<\/div>\n
        03<\/div>\n
        04<\/div>\n
        05<\/div>\n
        06<\/div>\n
        07<\/div>\n
        08<\/div>\n
        09<\/div>\n
        10<\/div>\n
        11<\/div>\n
        12<\/div>\n<\/td>\n
        		\n
        \n
        class<\/code> ImageDownloadWorker(<\/code>private<\/code> val mContext: Context, workerParameters: WorkerParameters) :<\/code><\/div>\n
            <\/code>Worker(mContext, workerParameters) {<\/code><\/div>\n
         <\/div>\n
            <\/code>@SuppressLint<\/code>(<\/code>\"RestrictedApi\"<\/code>, <\/code>\"CheckResult\"<\/code>)<\/code><\/div>\n
            <\/code>override fun doWork(): Result {<\/code><\/div>\n
                <\/code>val imagesJson = inputData.getString(<\/code>\"images\"<\/code>)<\/code><\/div>\n
         <\/div>\n
                <\/code>return<\/code> Result.Success()<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        We\u2019ll convert it into a list of image objects using Gson. Image is a data class that I created for storing info about images easily.<\/p>\n

        \n
        \n\n\n\n
        \n
        01<\/div>\n
        02<\/div>\n
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        04<\/div>\n
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        17<\/div>\n
        18<\/div>\n
        19<\/div>\n
        20<\/div>\n
        21<\/div>\n<\/td>\n
        		\n
        \n
        class<\/code> ImageDownloadWorker(<\/code>private<\/code> val mContext: Context, workerParameters: WorkerParameters) :<\/code><\/div>\n
            <\/code>Worker(mContext, workerParameters) {<\/code><\/div>\n
         <\/div>\n
         <\/div>\n
            <\/code>@SuppressLint<\/code>(<\/code>\"RestrictedApi\"<\/code>, <\/code>\"CheckResult\"<\/code>)<\/code><\/div>\n
            <\/code>override fun doWork(): Result {<\/code><\/div>\n
         <\/div>\n
                <\/code>val imagesJson = inputData.getString(<\/code>\"images\"<\/code>)<\/code><\/div>\n
                <\/code>val gson = Gson()<\/code><\/div>\n
                <\/code>val listOfImages = gson.fromJson<List<Image>>(imagesJson, object : TypeToken<List<Image>>() {}.type);<\/code><\/div>\n
         <\/div>\n
                <\/code>listOfImages.forEachIndexed { index, image -><\/code><\/div>\n
                    <\/code>Thread.sleep(<\/code>1000<\/code>) <\/code>\/\/emulating network call.<\/code><\/div>\n
                    <\/code>downloadImage(image, index)<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
         <\/div>\n
                <\/code>return<\/code> Result.Success()<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        The Image class:<\/p>\n

        \n
        \n\n\n\n
        \n
        1<\/div>\n<\/td>\n
        		\n
        \n
        data <\/code>class<\/code> Image(var albumId: String, var id: String, var title: String, var url: String, var thumbnail: String)<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        Next up, we\u2019ll iterate through each image object, download the image and store it in our storage. Add the download function below to your worker:<\/p>\n

        \n
        \n\n\n\n
        \n
        01<\/div>\n
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        04<\/div>\n
        05<\/div>\n
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        20<\/div>\n
        21<\/div>\n<\/td>\n
        		\n
        \n
        private<\/code> fun downloadImage(image: Image, index: Int) {<\/code><\/div>\n
            <\/code>val client = OkHttpClient()<\/code><\/div>\n
            <\/code>val request = Request.Builder()<\/code><\/div>\n
                <\/code>.url(image.url)<\/code><\/div>\n
                <\/code>.build()<\/code><\/div>\n
         <\/div>\n
            <\/code>try<\/code> {<\/code><\/div>\n
                <\/code>val response = client.newCall(request).execute()<\/code><\/div>\n
                <\/code>val bitmap = BitmapFactory.decodeStream(response.body()?.byteStream())<\/code><\/div>\n
         <\/div>\n
                <\/code>ImageUtil.saveBitmap(mContext, bitmap, image.title).subscribe({ img -><\/code><\/div>\n
                    <\/code>displayNotification(ProgressUpdateEvent(image.title, <\/code>3<\/code>, index + <\/code>1<\/code>))<\/code><\/div>\n
                    <\/code>EventBus.getDefault().post(ImageDownloadedEvent(img, image.title, image.id))<\/code><\/div>\n
                <\/code>}, { error -><\/code><\/div>\n
                    <\/code>error.printStackTrace()<\/code><\/div>\n
                <\/code>})<\/code><\/div>\n
         <\/div>\n
            <\/code>} <\/code>catch<\/code> (e: Exception) {<\/code><\/div>\n
                <\/code>e.printStackTrace()<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        It uses the ImageUtil class provided below. I created it to keep my logic for downloading the image separate. Create a new ImageUtil class and add the code below:<\/p>\n

        \n
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        45<\/div>\n<\/td>\n
        		\n
        \n
        package<\/code> com.example.workmanagerdemo<\/code><\/div>\n
         <\/div>\n
        import<\/code> android.annotation.SuppressLint<\/code><\/div>\n
        import<\/code> android.content.Context<\/code><\/div>\n
        import<\/code> android.graphics.Bitmap<\/code><\/div>\n
        import<\/code> io.reactivex.Observable<\/code><\/div>\n
        import<\/code> io.reactivex.Single<\/code><\/div>\n
        import<\/code> java.io.ByteArrayOutputStream<\/code><\/div>\n
        import<\/code> java.io.File<\/code><\/div>\n
        import<\/code> java.io.FileOutputStream<\/code><\/div>\n
        import<\/code> java.io.IOException<\/code><\/div>\n
         <\/div>\n
        object ImageUtil {<\/code><\/div>\n
         <\/div>\n
            <\/code>@SuppressLint<\/code>(<\/code>\"CheckResult\"<\/code>)<\/code><\/div>\n
            <\/code>fun saveBitmap(context: Context, bitmap: Bitmap, filename: String): Single<String> {<\/code><\/div>\n
                <\/code>return<\/code> Single.create<String> { emitter -><\/code><\/div>\n
                    <\/code>val stream = ByteArrayOutputStream()<\/code><\/div>\n
                    <\/code>bitmap.compress(Bitmap.CompressFormat.JPEG, <\/code>30<\/code>, stream)<\/code><\/div>\n
                    <\/code>val mediaByteArray = stream.toByteArray()<\/code><\/div>\n
         <\/div>\n
                    <\/code>try<\/code> {<\/code><\/div>\n
                        <\/code>val myDir = context.filesDir<\/code><\/div>\n
         <\/div>\n
                        <\/code>val path = <\/code>\"$myDir\/media\/\"<\/code><\/div>\n
                        <\/code>val secondFile = File(<\/code>\"$myDir\/media\/\"<\/code>, filename)<\/code><\/div>\n
         <\/div>\n
                        <\/code>if<\/code> (!secondFile.parentFile.exists()) {<\/code><\/div>\n
                            <\/code>secondFile.parentFile.mkdirs()<\/code><\/div>\n
                        <\/code>}<\/code><\/div>\n
                        <\/code>secondFile.createNewFile()<\/code><\/div>\n
         <\/div>\n
                        <\/code>val fos = FileOutputStream(secondFile)<\/code><\/div>\n
                        <\/code>fos.write(mediaByteArray)<\/code><\/div>\n
                        <\/code>fos.flush()<\/code><\/div>\n
                        <\/code>fos.close()<\/code><\/div>\n
                        <\/code>emitter.onSuccess(path)<\/code><\/div>\n
                    <\/code>} <\/code>catch<\/code> (exception: IOException) {<\/code><\/div>\n
                        <\/code>exception.printStackTrace()<\/code><\/div>\n
                        <\/code>emitter.onError(exception)<\/code><\/div>\n
                    <\/code>}<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        Displaying the notification<\/b><\/h3>\n

        To display a notification for progress, add the following method to your worker. Also invoke it at the start of doWork<\/strong> method.<\/p>\n

        \n
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        		\n
        \n
        class<\/code> ImageDownloadWorker(<\/code>private<\/code> val mContext: Context, workerParameters: WorkerParameters) :<\/code><\/div>\n
            <\/code>Worker(mContext, workerParameters) {<\/code><\/div>\n
         <\/div>\n
            <\/code>private<\/code> val notificationManager =<\/code><\/div>\n
                <\/code>applicationContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager<\/code><\/div>\n
         <\/div>\n
            <\/code>@SuppressLint<\/code>(<\/code>\"RestrictedApi\"<\/code>, <\/code>\"CheckResult\"<\/code>)<\/code><\/div>\n
            <\/code>override fun doWork(): Result {<\/code><\/div>\n
         <\/div>\n
                <\/code>Log.d(<\/code>\"AndroidVille\"<\/code>, Thread.currentThread().toString())<\/code><\/div>\n
                <\/code>displayNotification(ProgressUpdateEvent(<\/code>\"Please wait...\"<\/code>, <\/code>3<\/code>, <\/code>0<\/code>))<\/code><\/div>\n
         <\/div>\n
                <\/code>val imagesJson = inputData.getString(<\/code>\"images\"<\/code>)<\/code><\/div>\n
                <\/code>val gson = Gson()<\/code><\/div>\n
                <\/code>val listOfImages = gson.fromJson<List<Image>>(imagesJson, object : TypeToken<List<Image>>() {}.type);<\/code><\/div>\n
         <\/div>\n
                <\/code>listOfImages.forEachIndexed { index, image -><\/code><\/div>\n
                    <\/code>Thread.sleep(<\/code>1000<\/code>) <\/code>\/\/emulating network call.<\/code><\/div>\n
                    <\/code>downloadImage(image, index)<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
         <\/div>\n
                <\/code>notificationManager.cancel(notificationId)<\/code><\/div>\n
                <\/code>return<\/code> Result.Success()<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
         <\/div>\n
            <\/code>private<\/code> val notificationId: Int = <\/code>500<\/code><\/div>\n
            <\/code>private<\/code> val notificationChannel: String = <\/code>\"demo\"<\/code><\/div>\n
         <\/div>\n
            <\/code>private<\/code> fun displayNotification(prog: ProgressUpdateEvent) {<\/code><\/div>\n
                <\/code>if<\/code> (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {<\/code><\/div>\n
                    <\/code>val channel = NotificationChannel(<\/code><\/div>\n
                        <\/code>notificationChannel,<\/code><\/div>\n
                        <\/code>notificationChannel,<\/code><\/div>\n
                        <\/code>NotificationManager.IMPORTANCE_DEFAULT<\/code><\/div>\n
                    <\/code>)<\/code><\/div>\n
                    <\/code>channel.enableVibration(<\/code>false<\/code>)<\/code><\/div>\n
                    <\/code>notificationManager.createNotificationChannel(channel)<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
         <\/div>\n
                <\/code>val notificationBuilder =<\/code><\/div>\n
                    <\/code>NotificationCompat.Builder(applicationContext, notificationChannel)<\/code><\/div>\n
         <\/div>\n
                <\/code>val remoteView = RemoteViews(applicationContext.packageName, R.layout.custom_notif)<\/code><\/div>\n
                <\/code>remoteView.setImageViewResource(R.id.iv_notif, R.drawable.eminem)<\/code><\/div>\n
                <\/code>remoteView.setTextViewText(R.id.tv_notif_progress, <\/code>\"${prog.message} (${prog.progress}\/${prog.total} complete)\"<\/code>)<\/code><\/div>\n
                <\/code>remoteView.setTextViewText(R.id.tv_notif_title, <\/code>\"Downloading Images\"<\/code>)<\/code><\/div>\n
                <\/code>remoteView.setProgressBar(R.id.pb_notif, prog.total, prog.progress, <\/code>false<\/code>)<\/code><\/div>\n
         <\/div>\n
                <\/code>notificationBuilder<\/code><\/div>\n
                    <\/code>.setContent(remoteView)<\/code><\/div>\n
                    <\/code>.setSmallIcon(R.drawable.eminem)<\/code><\/div>\n
         <\/div>\n
                <\/code>notificationManager.notify(notificationId, notificationBuilder.build())<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>data <\/code>class<\/code> ProgressUpdateEvent(var message: String, var total: Int, var progress: Int)<\/code><\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        We\u2019ll also have to cancel the notification when the worker stops. So override the onStopped method and add the following:<\/p>\n

        \n
        \n\n\n\n
        \n
        1<\/div>\n
        2<\/div>\n
        3<\/div>\n
        4<\/div>\n<\/td>\n
        		\n
        \n
        override fun onStopped() {<\/code><\/div>\n
            <\/code>super<\/code>.onStopped()<\/code><\/div>\n
            <\/code>notificationManager.cancel(notificationId)<\/code><\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        And we\u2019re done! Finally this is what your ImageDownloadWorker<\/b> file would look like:<\/p>\n

        \n
        \n\n\n\n
        \n
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        		\n
        \n
        package<\/code> com.example.workmanagerdemo<\/code><\/div>\n
         <\/div>\n
        import<\/code> android.annotation.SuppressLint<\/code><\/div>\n
        import<\/code> android.app.NotificationChannel<\/code><\/div>\n
        import<\/code> android.app.NotificationManager<\/code><\/div>\n
        import<\/code> android.content.Context<\/code><\/div>\n
        import<\/code> android.graphics.BitmapFactory<\/code><\/div>\n
        import<\/code> android.util.Log<\/code><\/div>\n
        import<\/code> android.widget.RemoteViews<\/code><\/div>\n
        import<\/code> androidx.core.app.NotificationCompat<\/code><\/div>\n
        import<\/code> androidx.work.Worker<\/code><\/div>\n
        import<\/code> androidx.work.WorkerParameters<\/code><\/div>\n
        import<\/code> com.google.gson.Gson<\/code><\/div>\n
        import<\/code> com.google.gson.reflect.TypeToken<\/code><\/div>\n
        import<\/code> io.reactivex.Observable<\/code><\/div>\n
        import<\/code> okhttp3.OkHttpClient<\/code><\/div>\n
        import<\/code> okhttp3.Request<\/code><\/div>\n
        import<\/code> org.greenrobot.eventbus.EventBus<\/code><\/div>\n
        import<\/code> java.util.concurrent.TimeUnit<\/code><\/div>\n
         <\/div>\n
         <\/div>\n
        class<\/code> ImageDownloadWorker(<\/code>private<\/code> val mContext: Context, workerParameters: WorkerParameters) :<\/code><\/div>\n
            <\/code>Worker(mContext, workerParameters) {<\/code><\/div>\n
         <\/div>\n
            <\/code>private<\/code> val notificationManager =<\/code><\/div>\n
                <\/code>applicationContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager<\/code><\/div>\n
         <\/div>\n
            <\/code>@SuppressLint<\/code>(<\/code>\"RestrictedApi\"<\/code>, <\/code>\"CheckResult\"<\/code>)<\/code><\/div>\n
            <\/code>override fun doWork(): Result {<\/code><\/div>\n
                <\/code>Log.d(<\/code>\"AndroidVille\"<\/code>, Thread.currentThread().toString())<\/code><\/div>\n
                <\/code>displayNotification(ProgressUpdateEvent(<\/code>\"Please wait...\"<\/code>, <\/code>3<\/code>, <\/code>0<\/code>))<\/code><\/div>\n
                <\/code>val imagesJson = inputData.getString(<\/code>\"images\"<\/code>)<\/code><\/div>\n
                <\/code>val gson = Gson()<\/code><\/div>\n
                <\/code>val listOfImages = gson.fromJson<List<Image>>(imagesJson, object : TypeToken<List<Image>>() {}.type);<\/code><\/div>\n
         <\/div>\n
                <\/code>listOfImages.forEachIndexed { index, image -><\/code><\/div>\n
                    <\/code>Thread.sleep(<\/code>1000<\/code>) <\/code>\/\/emulating network call.<\/code><\/div>\n
                    <\/code>downloadImage(image, index)<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
         <\/div>\n
                <\/code>notificationManager.cancel(notificationId)<\/code><\/div>\n
                <\/code>return<\/code> Result.Success()<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>@SuppressLint<\/code>(<\/code>\"CheckResult\"<\/code>)<\/code><\/div>\n
            <\/code>private<\/code> fun downloadImage(image: Image, index: Int) {<\/code><\/div>\n
                <\/code>val client = OkHttpClient()<\/code><\/div>\n
                <\/code>val request = Request.Builder()<\/code><\/div>\n
                    <\/code>.url(image.url)<\/code><\/div>\n
                    <\/code>.build()<\/code><\/div>\n
         <\/div>\n
                <\/code>try<\/code> {<\/code><\/div>\n
                    <\/code>val response = client.newCall(request).execute()<\/code><\/div>\n
                    <\/code>val bitmap = BitmapFactory.decodeStream(response.body()?.byteStream())<\/code><\/div>\n
         <\/div>\n
                    <\/code>ImageUtil.saveBitmap(mContext, bitmap, image.title).subscribe({ img -><\/code><\/div>\n
                        <\/code>displayNotification(ProgressUpdateEvent(image.title, <\/code>3<\/code>, index + <\/code>1<\/code>))<\/code><\/div>\n
                        <\/code>EventBus.getDefault().post(ImageDownloadedEvent(img, image.title, image.id))<\/code><\/div>\n
                    <\/code>}, { error -><\/code><\/div>\n
                        <\/code>error.printStackTrace()<\/code><\/div>\n
                    <\/code>})<\/code><\/div>\n
         <\/div>\n
                <\/code>} <\/code>catch<\/code> (e: Exception) {<\/code><\/div>\n
                    <\/code>e.printStackTrace()<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>private<\/code> val notificationId: Int = <\/code>500<\/code><\/div>\n
            <\/code>private<\/code> val notificationChannel: String = <\/code>\"demo\"<\/code><\/div>\n
         <\/div>\n
            <\/code>private<\/code> fun displayNotification(prog: ProgressUpdateEvent) {<\/code><\/div>\n
                <\/code>if<\/code> (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {<\/code><\/div>\n
                    <\/code>val channel = NotificationChannel(<\/code><\/div>\n
                        <\/code>notificationChannel,<\/code><\/div>\n
                        <\/code>notificationChannel,<\/code><\/div>\n
                        <\/code>NotificationManager.IMPORTANCE_DEFAULT<\/code><\/div>\n
                    <\/code>)<\/code><\/div>\n
                    <\/code>channel.enableVibration(<\/code>false<\/code>)<\/code><\/div>\n
                    <\/code>notificationManager.createNotificationChannel(channel)<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
         <\/div>\n
                <\/code>val notificationBuilder =<\/code><\/div>\n
                    <\/code>NotificationCompat.Builder(applicationContext, notificationChannel)<\/code><\/div>\n
         <\/div>\n
                <\/code>val remoteView = RemoteViews(applicationContext.packageName, R.layout.custom_notif)<\/code><\/div>\n
                <\/code>remoteView.setImageViewResource(R.id.iv_notif, R.drawable.eminem)<\/code><\/div>\n
                <\/code>remoteView.setTextViewText(R.id.tv_notif_progress, <\/code>\"${prog.message} (${prog.progress}\/${prog.total} complete)\"<\/code>)<\/code><\/div>\n
                <\/code>remoteView.setTextViewText(R.id.tv_notif_title, <\/code>\"Downloading Images\"<\/code>)<\/code><\/div>\n
                <\/code>remoteView.setProgressBar(R.id.pb_notif, prog.total, prog.progress, <\/code>false<\/code>)<\/code><\/div>\n
         <\/div>\n
                <\/code>notificationBuilder<\/code><\/div>\n
                    <\/code>.setContent(remoteView)<\/code><\/div>\n
                    <\/code>.setSmallIcon(R.drawable.eminem)<\/code><\/div>\n
         <\/div>\n
                <\/code>notificationManager.notify(notificationId, notificationBuilder.build())<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>override fun onStopped() {<\/code><\/div>\n
                <\/code>super<\/code>.onStopped()<\/code><\/div>\n
                <\/code>notificationManager.cancel(notificationId)<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>data <\/code>class<\/code> ProgressUpdateEvent(var message: String, var total: Int, var progress: Int)<\/code><\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        Display the images in MainActivity<\/b><\/h3>\n

        We\u2019re sending an event from our worker. We\u2019ll catch it in our MainActivity class and display the image. <\/p>\n

        Simply initialise the EventBus in onStart and stop it in onStop. Here\u2019s what your final MainActivity.kt file would look like:<\/p>\n

        \n
        \n\n\n\n
        \n
        01<\/div>\n
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        91<\/div>\n<\/td>\n
        		\n
        \n
        package<\/code> com.example.workmanagerdemo<\/code><\/div>\n
         <\/div>\n
        import<\/code> android.annotation.SuppressLint<\/code><\/div>\n
        import<\/code> android.os.Bundle<\/code><\/div>\n
        import<\/code> android.widget.Toast<\/code><\/div>\n
        import<\/code> androidx.appcompat.app.AppCompatActivity<\/code><\/div>\n
        import<\/code> androidx.work.*<\/code><\/div>\n
        import<\/code> com.squareup.picasso.Picasso<\/code><\/div>\n
        import<\/code> kotlinx.android.synthetic.main.activity_main.*<\/code><\/div>\n
        import<\/code> org.greenrobot.eventbus.EventBus<\/code><\/div>\n
        import<\/code> org.greenrobot.eventbus.Subscribe<\/code><\/div>\n
        import<\/code> org.greenrobot.eventbus.ThreadMode<\/code><\/div>\n
        import<\/code> java.io.File<\/code><\/div>\n
         <\/div>\n
        class<\/code> MainActivity : AppCompatActivity() {<\/code><\/div>\n
         <\/div>\n
            <\/code>val jsonString: String = <\/code>\"[\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"  {\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"albumId\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"id\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"title\\\": \\\"Eminem\\\",\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"url\\\": \\\"https:\/\/i.pinimg.com\/originals\/c4\/14\/4f\/c4144fba258c2f0b4735180fe5d9a03b.jpg<\/a>\\\",\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"thumbnailUrl\\\": \\\"https:\/\/via.placeholder.com\/150\/92c952<\/a>\\\"\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"  },\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"  {\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"albumId\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"id\\\": 2,\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"title\\\": \\\"MEME\\\",\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"url\\\": \\\"https:\/\/pics.me.me\/eminems-emotions-suprised-sad-happy-curious-annoyed-excited-shocked-bored-13877943.png<\/a>\\\",\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"thumbnailUrl\\\": \\\"https:\/\/via.placeholder.com\/150\/771796<\/a>\\\"\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"  },\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"  {\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"albumId\\\": 1,\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"id\\\": 3,\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"title\\\": \\\"Eminem News\\\",\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"url\\\": \\\"https:\/\/www.sohh.com\/wp-content\/uploads\/Eminem.jpg<\/a>\\\",\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"    \\\"thumbnailUrl\\\": \\\"https:\/\/via.placeholder.com\/150\/24f355<\/a>\\\"\\n\"<\/code> +<\/code><\/div>\n
                    <\/code>\"  }]\"<\/code><\/div>\n
         <\/div>\n
         <\/div>\n
            <\/code>@SuppressLint<\/code>(<\/code>\"CheckResult\"<\/code>)<\/code><\/div>\n
            <\/code>override fun onCreate(savedInstanceState: Bundle?) {<\/code><\/div>\n
                <\/code>super<\/code>.onCreate(savedInstanceState)<\/code><\/div>\n
                <\/code>setContentView(R.layout.activity_main)<\/code><\/div>\n
         <\/div>\n
                <\/code>btn_download.setOnClickListener {<\/code><\/div>\n
                    <\/code>startWorker()<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>private<\/code> fun startWorker() {<\/code><\/div>\n
                <\/code>val data = Data.Builder()<\/code><\/div>\n
                    <\/code>.putString(<\/code>\"images\"<\/code>, jsonString)<\/code><\/div>\n
                    <\/code>.build()<\/code><\/div>\n
         <\/div>\n
                <\/code>val constraints = Constraints.Builder()<\/code><\/div>\n
                    <\/code>.setRequiredNetworkType(NetworkType.CONNECTED)<\/code><\/div>\n
         <\/div>\n
                <\/code>val oneTimeRequest = OneTimeWorkRequest.Builder(ImageDownloadWorker::<\/code>class<\/code>.java)<\/code><\/div>\n
                    <\/code>.setInputData(data)<\/code><\/div>\n
                    <\/code>.setConstraints(constraints.build())<\/code><\/div>\n
                    <\/code>.addTag(<\/code>\"demo\"<\/code>)<\/code><\/div>\n
                    <\/code>.build()<\/code><\/div>\n
         <\/div>\n
                <\/code>Toast.makeText(<\/code>this<\/code>, <\/code>\"Starting worker\"<\/code>, Toast.LENGTH_SHORT).show()<\/code><\/div>\n
         <\/div>\n
                <\/code>WorkManager.getInstance(<\/code>this<\/code>)<\/code><\/div>\n
                    <\/code>.enqueueUniqueWork(<\/code>\"AndroidVille\"<\/code>, ExistingWorkPolicy.KEEP, oneTimeRequest)<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>@Subscribe<\/code>(threadMode = ThreadMode.MAIN)<\/code><\/div>\n
            <\/code>fun onEvent(imageDownloadedEvent: ImageDownloadedEvent) {<\/code><\/div>\n
                <\/code>val file = File(<\/code>\"${imageDownloadedEvent.path}\/${imageDownloadedEvent.name}\"<\/code>)<\/code><\/div>\n
                <\/code>when (imageDownloadedEvent.id) {<\/code><\/div>\n
                    <\/code>\"1\"<\/code> -> Picasso.get().load(file).into(iv_1)<\/code><\/div>\n
                    <\/code>\"2\"<\/code> -> Picasso.get().load(file).into(iv_2)<\/code><\/div>\n
                    <\/code>\"3\"<\/code> -> Picasso.get().load(file).into(iv_3)<\/code><\/div>\n
                <\/code>}<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>override fun onStart() {<\/code><\/div>\n
                <\/code>super<\/code>.onStart()<\/code><\/div>\n
                <\/code>EventBus.getDefault().register(<\/code>this<\/code>)<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
            <\/code>override fun onStop() {<\/code><\/div>\n
                <\/code>super<\/code>.onStop()<\/code><\/div>\n
                <\/code>EventBus.getDefault().unregister(<\/code>this<\/code>)<\/code><\/div>\n
            <\/code>}<\/code><\/div>\n
         <\/div>\n
        }<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

        Here\u2019s the final app:<\/p>\n

        \n
        \"\"<\/figure>\n<\/div>\n

        This brings us to the end of our work manager in android tutorial. If you have any problems with the application let me know in the comments below and I\u2019ll be happy to help you out.<\/p>\n

        You can find the repository for this project here on github: https:\/\/github.com\/Ayusch\/WorkManagerDemo<\/a><\/p>\n

        \n\n\n\n
        \n

        Published on Java Code Geeks with permission by Ayusch Jain, partner at our JCG program<\/a>. See the original article here: Using Work Manager in Android with Example<\/a><\/p>\n

        Opinions expressed by Java Code Geeks contributors are their own.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

        In this post, we\u2019ll take a look at how to use the work manager in android. Work manager is a part of the android architecture components and is a good replacement of all the previous scheduling options. Other scheduling options such as JobScheduler, GcmNetworkManager etc. But they had their shortcomings. GcmNetworkManager required play services, so …<\/p>\n","protected":false},"author":100723,"featured_media":46,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-106879","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-android-core"],"yoast_head":"\nUsing Work Manager in Android with Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"In this post, we\u2019ll take a look at how to use the work manager in android. 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