Android AsyncTask API deprecating in Android 11.What are the alternatives?

private WeakReference<MyActivity> activityReference;

Good riddance that it's deprecated, because the WeakReference<Context> was always a hack, and not a proper solution.

Now people will have the opportunity to sanitize their code.

---

AsyncTask<String, Void, MyPojo> 

Based on this code, Progress is actually not needed, and there is a String input + MyPojo output.

This is actually quite easy to accomplish without any use of AsyncTask.

public class TaskRunner {
    private final Executor executor = Executors.newSingleThreadExecutor(); // change according to your requirements
    private final Handler handler = new Handler(Looper.getMainLooper());

    public interface Callback<R> {
        void onComplete(R result);
    }

    public <R> void executeAsync(Callable<R> callable, Callback<R> callback) {
        executor.execute(() -> {
            final R result = callable.call();
            handler.post(() -> {
                callback.onComplete(result);
            });
        });
    }
}

How to pass in the String? Like so:

class LongRunningTask implements Callable<MyPojo> {
    private final String input;

    public LongRunningTask(String input) {
        this.input = input;
    }

    @Override
    public MyPojo call() {
        // Some long running task
        return myPojo;
    }
}

And

// in ViewModel
taskRunner.executeAsync(new LongRunningTask(input), (data) -> {
    // MyActivity activity = activityReference.get();
    // activity.progressBar.setVisibility(View.GONE);
    // populateData(activity, data) ;

    loadingLiveData.setValue(false);
    dataLiveData.setValue(data);
});

// in Activity
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main_activity);

    viewModel = ViewModelProviders.of(this).get(MyViewModel.class);
    viewModel.loadingLiveData.observe(this, (loading) -> {
        if(loading) {
            progressBar.setVisibility(View.VISIBLE);
        } else {
            progressBar.setVisibility(View.GONE);
        }
    });

    viewModel.dataLiveData.observe(this, (data) -> {
        populateData(data);
    }); 
}

---

This example used a single-threaded pool which is good for DB writes (or serialized network requests), but if you want something for DB reads or multiple requests, you can consider the following Executor configuration:

private static final Executor THREAD_POOL_EXECUTOR =
        new ThreadPoolExecutor(5, 128, 1,
                TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());

You can directly use Executors from java.util.concurrent package.

I also searched about it and I found a solution in this Android Async API is Deprecated post.

Unfortunately the post is using Kotlin, but after a little effort I have converted it to Java. So here is the solution.

    ExecutorService executor = Executors.newSingleThreadExecutor();
    Handler handler = new Handler(Looper.getMainLooper());

    executor.execute(new Runnable() {
        @Override
        public void run() {

            //Background work here

            handler.post(new Runnable() {
                @Override
                public void run() {
                    //UI Thread work here
                }
            });
        }
    });

Pretty simple right? You can simplify it little more if you are using Java8 in your project.

    ExecutorService executor = Executors.newSingleThreadExecutor();
    Handler handler = new Handler(Looper.getMainLooper());

    executor.execute(() -> {
        //Background work here
        handler.post(() -> {
            //UI Thread work here
        });
    });

Still, it cannot defeat kotlin terms of conciseness of the code, but better than the previous java version.

Hope this will help you. Thank You

One of the simplest alternative is to use Thread

new Thread(new Runnable() {
    @Override
    public void run() {
        // do your stuff
        runOnUiThread(new Runnable() {
            public void run() {
                // do onPostExecute stuff
            }
        });
    }
}).start();

If your project supports JAVA 8, you can use lambda

new Thread(() -> {
        // do background stuff here
        runOnUiThread(()->{
            // OnPostExecute stuff here
        });
    }).start();