How to check if current thread is not main thread

I need to check if the thread running a certain piece of code is the main (UI) thread or not. How can I achieve this?

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Looper.myLooper() == Looper.getMainLooper()

如果这返回true，那么你在UI线程上！

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you can use below code to know if current thread is UI/Main thread or not

if(Looper.myLooper() == Looper.getMainLooper()) {
   // Current Thread is Main Thread.
}

or you can also use this

if(Looper.getMainLooper().getThread() == Thread.currentThread()) {
   // Current Thread is Main Thread.
}

Here is similar question

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The best way is the clearest way: *

Thread.currentThread() == Looper.getMainLooper().getThread()

Or, if the runtime platform is API level 23 (Marshmallow 6.0) or higher:

Looper.getMainLooper().isCurrentThread()

See the Looper API. Note that calling Looper.getMainLooper() involves synchonization (see the source). You might want to avoid the overhead by storing the return value and reusing it.

* credit greg7gkb

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