How to check if current thread is not main thread

Question

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

User · Answer

You can try Thread currentThread   isDaemon

User · Answer

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

User · Answer

Xamarin Android port   C    public bool IsMainThread   gt  Build VERSION SdkInt  gt   BuildVersionCodes M       Looper MainLooper IsCurrentThread       Looper MyLooper      Looper MainLooper    Usage   if  IsMainThread           you are on UI Main thread

User · Answer

A simple Toast message works also as a quick check

User · Answer

Allow me to preface this with  I acknowledged this post has the  Android  tag  however  my search had nothing to do with  Android  and this was my top result  To that end  for the non-Android SO Java users landing here  don t forget about   public static void main String   args      Thread currentThread   setName  SomeNameIChoose             the rest of main          After setting this  elsewhere in your code  you can easily check if you re about to execute on the main thread with   if Thread currentThread   getName   equals  SomeNameIChoose            do something on main thread     A bit embarrassed I had searched before remembering this  but hopefully it will help someone else

User · Answer

The best way is the clearest  most robust way     Thread currentThread   equals  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 synchronization  see the source    You might want to avoid the overhead by storing the return value and reusing it    nbsp  nbsp  nbsp   credit greg7gkb and 2cupsOfTech

User · Answer

You can check   if Looper myLooper      Looper getMainLooper            You are on mainThread   else     you are on non-ui thread

User · Answer

you can verify it in android ddms logcat where process id will be same but thread id will be different

User · Answer

Looper myLooper      Looper getMainLooper     if this returns true  then you re on the UI thread

User · Answer

Summarizing the solutions  I think that s the best one   boolean isUiThread   VERSION SDK INT  gt   VERSION CODES M        Looper getMainLooper   isCurrentThread         Thread currentThread      Looper getMainLooper   getThread      And  if you wish to run something on the UI thread  you can use this   new Handler Looper getMainLooper    post new Runnable          Override     public void run              this runs on the UI thread

[java] How to check if current thread is not main thread

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