...

allprojects {
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

...

dependencyResolutionManagement {
    ...
    repositories {
        ...
        maven { url 'https://jitpack.io' }
    }
}

...

dependencies {
    ...
    implementation 'com.github.buggysofts-com:AndroidBatchWorker:v1.0.2'
}

new BatchWorker<Integer, Double>(
    MainActivity.this,
    "Title",
    Arrays.asList(1, 2, 3, 4, 5),
    DialogMode.MODE_CLASSIC,
    new WorkerCallBack<Integer, Double>() {
        @UiThread
        @Override
        public void onShortPreWork() {
            // todo - perform any instantaneous task - eg. update/initialize ui
        }
    
        @WorkerThread
        @Override
        public void onLongPreWork(@NonNull List<Integer> dataList) {
            // todo - perform any long running task on the data
            // eg. initialize one or more property of each data item.
        }
    
        @Override
        public String longPreWorkDescriptor() {
            // todo - return anything you like, eg. "initializing", "connecting" etc.
            return "Pre-Processing...";
        }
    
        @WorkerThread
        @Override
        public Double performTask(@NonNull List<Integer> dataList, int activeDataIndex) {
            Integer activeData = dataList.get(activeDataIndex);
    
            // todo - perform actual task(may be long running) on each data item
            double lResult = getLongRunningProcessResult(activeData);
    
            // return a result
            return activeData*lResult;
        }
    
        @Override
        public String taskLabelDescriptor(@NonNull List<Integer> dataList, int activeDataIndex) {
            // todo - return any short details about the operation on the active data
            // e.g. it's name or any other details etc.
            return String.format("%s", dataList.get(activeDataIndex));
        }
    
        @Override
        public String taskProgressDescriptor(@NonNull List<Integer> dataList, int activeDataIndex) {
            // todo - return a text representation of the progress, for example...
            return String.format(
                "%s/%s",
                activeDataIndex+1,
                dataList.size()
            );
        }
    
        @WorkerThread
        @Override
        public void onLongPostWork(@NonNull List<Double> results) {
            // todo - perform any long running task on the result list
            // eg. finalize works, free used resources, anything.
        }
    
        @Override
        public String longPostWorkDescriptor() {
            // todo - return anything you like, eg. "Finalizing", "Clearing temporary resources" etc.
            return "Post-Processing...";
        }
    
        @UiThread
        @Override
        public void onShortPostWork(@NonNull List<Double> results, boolean completed) {
            // todo - perform any instantaneous task - eg. update/finalize ui
        }
    }
).start();