Android interface refresh

Both Android invalidate and postinvalidate are used to refresh the interface. The usage difference is as follows:

1) invalidate ():Instantiate a handler object and rewrite the handlemessage method to call invalidate () to refresh the interface. The online program sends the interface to update the message through sendmessage.

 //  Enable thread in oncreate () 
 New Thread ( New Gamethread (). Start ();

 //  Instantiate a handler 
Handler myhandler = New Handler (){
 //  Post-processing of received messages  
 Public   Void Handlemessage (Message MSG ){
 Switch (Msg. What ){
 Case Activity01.refresh:
Mgameview. Invalidate () ; //  Refresh page  
  Break ;
}

 Super . Handlemessage (MSG );
}
};

 Class Gamethread Implements Runnable {
 Public   Void Run (){
 While (! Thread. currentthread (). isinterrupted ()){
Message message = New Message ();
Message. What = activity01.refresh;
 //  Send message  
 Activity01.This . Myhandler. sendmessage (Message );
 Try {
Thread. Sleep (100 );
} Catch (Interruptedexception e ){
Thread. currentthread (). Interrupt ();
}
}
}
}

2)Using postinvalidate is relatively simple and requires no handler. You can directly call postinvalidate in the thread.

ClassGamethreadImplementsRunnable {
Public VoidRun (){
While(! Thread. currentthread (). isinterrupted ()){
Try{
Thread. Sleep (100 );
}Catch(Interruptedexception e ){
Thread. currentthread (). Interrupt ();
}

//You can use postinvalidate to directly update the interface in the thread.
Mgameview. postinvalidate ();
}
}
}