How to get Executor for main thread on API level < 28

Question

On API level 28(Pie) a new method is introduced in the Context class to get Executor for the main thread getMainExecutor().

How to get this executor on API

Answer 1

You can use code snippet from retrofit https://github.com/square/retrofit/blob/master/retrofit/src/main/java/retrofit2/Platform.java

public class MainThreadExecutor implements Executor {
    private final Handler handler = new Handler(Looper.getMainLooper());

    @Override 
    public void execute(Runnable r) {
        handler.post(r);
    }
}