Comparison of Android Handler Looper and runOnUiThread

When calling from a thread other than the UI thread, the following two writing methods are the same.

Looper.getMainLooper()

Runnable task = getTask();
new Handler(Looper.getMainLooper()).post(task);

Activity#runOnUiThread()

Runnable task = getTask();
runOnUiThread(task);

When calling from the UI thread, it will be executed directly to the UI thread in the case of runOnUiThread according to the following source.

public final void runOnUiThread(Runnable action) {
    if (Thread.currentThread() != mUiThread) {
        mHandler.post(action);
    } else { //Execute directly for UI thread
        action.run();
    }
}