how to show toast in WorkManager doWork()

how to show toast in WorkManager do work()?

When I try, it throws

Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

You can create Handler to show Toast on UI thread.

Your doWork method will be like:

@NonNull
@Override
public Result doWork() {
    Log.d(TAG, "doWork for Sync");

    Handler handler = new Handler(Looper.getMainLooper());
    handler.postDelayed(new Runnable() {
        @Override
        public void run() {
            // Run your task here
            Toast.makeText(mContext, "Testing", Toast.LENGTH_SHORT).show();
        }
    }, 1000 );

    return Result.success();
}

Note : mContext will be available in Constructor.

Hope it will help you. Thank you.