CoroutineTask - AsyncTask from scratch using Coroutines

AsyncTask has been deprecated in Android 11.
There are a lot of alternatives to AsyncTask like RxJava, Services, Coroutines, etc.

CoroutineTask is a utility that has the same structure as AsyncTask but uses Kotlin Coroutines underneath

How to use?

In the same way you use AsyncTask, just replace the keyword AsyncTask with CoroutineTask

Add build.gradle dependency

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9'

Save this file somewhere in your codebase

CoroutineTask.kt

Example 1: usage in Kotlin

val asyncTask = object: CoroutineTask <String?, Int?, String?>() {

    override fun onPreExecute() {}

    override fun doInBackground(vararg params: String?): String? {

        for (i in 0. .100000) {
            // optional, publishing the progress
            val progress: Int = (i / 1000)
            publishProgress(progress)
        }
        return params[0]
    }

    override fun onPostExecute(result: String?) {
        Toast.makeText(applicationContext, result, LENGTH_LONG).show()
    }

    override fun onCancelled() {}

    override fun onProgressUpdate(progress: Int?) {
        Log.i("progress: ", "" + progress)
    }
}

asyncTask.execute("background work completed")

Example 2: usage in Kotlin

val asyncTask: CoroutineTask <Void?, Void?, String?> =

    object : CoroutineTask <Void?, Void?, String?>() {

        override fun onPreExecute() {
            // do something
        }

        override fun doInBackground(vararg params: Void?): String? {
            return ""
        }

        override fun onPostExecute(result: String?) {
            // do something
        }

        override fun onCancelled() {
            // optional
        }

    }

asyncTask.execute()

Example 3: usage in Java

CoroutineTask asyncTask = new CoroutineTask <Void, Void, String>() {

    @Override
    protected void onPreExecute() {}

    @Override
    protected String doInBackground(Void... params) {
        return "";
    }

    @Override
    protected void onPostExecute(String result) {}

    @Override
    protected void onCancelled() {
        // optional
    }
};

asyncTask.execute();

Example 4: usage in Java (Simplest usage)

CoroutineTask asyncTask = new CoroutineTask <Void, Void, String>() {

    @Override
    protected void onPreExecute() {}

    @Override
    protected String doInBackground(Void... params) {
        return "";
    }

    @Override
    protected void onPostExecute(String result) {}
};

asyncTask.execute();

How to cancel the task?

asyncTask.cancel(true);