Java – Android runs the functions in the class in a new thread

I have this Code:

MyClass tmp = new MyClass();
tmp.setParam1(1);
tmp.SetParam2("Test");
tmp.setParam3("Test");
...

Then I have

tmp.heavyCalc();

During this heavy computing operation, I have to update the progress bar in the UI and show the user that it is using the update progress bar and some text to be displayed. Now it doesn't work because I don't use threads, the app gets stuck and hanged, and then suddenly returns that the progress bar is 100% and all the text suddenly appears

So I decided to let my function run as a new thread. In the internal definition of my class, I added the implementation runnable

public class MyClass implements Runnable{

Then I call the heavycalc() function to the new run() function created for me:

@Override
public void Run()
{
heavyCalc();
}

Now I do this:

Thread thread = new Thread(tmp);
tmp.run();

It works, but there is still no change in the UI. The application gets stuck, and then suddenly the progress bar is 100% and the application returns. What did I miss?

resolvent:

I suggest you use asynctask. Its purpose is exactly what you want to do. It allows you to run background operations and then update the UI with the results of such operations