How to Check/Detect Whether Current Thread is UI/Main Thread or Not in Android

Checking whether the current thread is the UI/Main thread or some other background thread is very easy. Here’s the code for it:

if (Looper.myLooper() == Looper.getMainLooper()) {
    // Current thread is the UI/Main thread

// Another approach

if (Looper.getMainLooper().getThread() == Thread.currentThread()) {
    // Current thread is the UI/Main thread

Bonus: If you’re in a thread other than the UI Thread and you want to execute a piece of code in the UI thread then you can make use of the runOnUiThread() method.

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// Sample code from one of my Android applications

runOnUiThread(new Runnable(){
    public void run() {

Hope that helps!

Author: Rishabh

Rishabh is a full stack web and mobile developer from India. Follow me on Twitter.

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