android - Error when executing an asynchTask -

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i have viewpager actiontabs each action tab has own layout. in 1 of layouts have button when clicked asynctask changes background color should executed shown below.

at run time receive below errors logcat.

please have @ logcat errors , kindly let me know missing in code.

code

class asynccolor extends asynctask<string, integer, string> {      @override     protected void onpreexecute() {         // todo auto-generated method stub         super.onpreexecute();     }      @override     protected string doinbackground(string... params) {         // todo auto-generated method stub         (int = 0; < params.length; i++){             rl_3.setbackgroundcolor(color.parsecolor(params[i]));         }         return "done";     }      @override     protected void onprogressupdate(integer... values) {         // todo auto-generated method stub         super.onprogressupdate(values);     }      @override     protected void onpostexecute(string result) {         // todo auto-generated method stub         super.onpostexecute(result);         btn_asynch.settext(result);     } }  @override public void onresume() {     // todo auto-generated method stub     super.onresume();      btn_asynch.setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             // todo auto-generated method stub             new asynchcolor().execute(asynchblue, asynchgreen, asynchred, asynchblue1, asynchgreen1, asynchred1);         }     });

logcat:

12-06 13:13:15.049: e/androidruntime(5591): fatal exception: asynctask #1 12-06 13:13:15.049: e/androidruntime(5591): java.lang.runtimeexception: error occured while executing doinbackground() 12-06 13:13:15.049: e/androidruntime(5591):     @ android.os.asynctask$3.done(asynctask.java:300) 12-06 13:13:15.049: e/androidruntime(5591):     @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:355) 12-06 13:13:15.049: e/androidruntime(5591):     @ java.util.concurrent.futuretask.setexception(futuretask.java:222) 12-06 13:13:15.049: e/androidruntime(5591):     @ java.util.concurrent.futuretask.run(futuretask.java:242) 12-06 13:13:15.049: e/androidruntime(5591):     @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112) 12-06 13:13:15.049: e/androidruntime(5591):     @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587) 12-06 13:13:15.049: e/androidruntime(5591):     @ java.lang.thread.run(thread.java:841) 12-06 13:13:15.049: e/androidruntime(5591): caused by: android.view.viewrootimpl$calledfromwrongthreadexception: original thread created view hierarchy can touch views. 12-06 13:13:15.049: e/androidruntime(5591):     @ android.view.viewrootimpl.checkthread(viewrootimpl.java:6832) 12-06 13:13:15.049: e/androidruntime(5591):     @ android.view.viewrootimpl.invalidatechildinparent(viewrootimpl.java:1053) 12-06 13:13:15.049: e/androidruntime(5591):     @ android.view.viewgroup.invalidatechild(viewgroup.java:4518) 12-06 13:13:15.049: e/androidruntime(5591):     @ android.view.view.invalidate(view.java:11687) 12-06 13:13:15.049: e/androidruntime(5591):     @ android.view.view.setbackgrounddrawable(view.java:16248) 12-06 13:13:15.049: e/androidruntime(5591):     @ android.view.view.setbackground(view.java:16139) 12-06 13:13:15.049: e/androidruntime(5591):     @ android.view.view.setbackgroundcolor(view.java:16101) 12-06 13:13:15.049: e/androidruntime(5591):     @ com.example.viewpagerwithactiontabstest00.aufgabe_7$asynchcolor.doinbackground(aufgabe_7.java:72) 12-06 13:13:15.049: e/androidruntime(5591):     @ com.example.viewpagerwithactiontabstest00.aufgabe_7$asynchcolor.doinbackground(aufgabe_7.java:1) 12-06 13:13:15.049: e/androidruntime(5591):     @ android.os.asynctask$2.call(asynctask.java:288) 12-06 13:13:15.049: e/androidruntime(5591):     @ java.util.concurrent.futuretask.run(futuretask.java:237)

you cant touch ui thread elements in doinbackground 

@override      protected string doinbackground(string... params) {         // todo auto-generated method stub          (int = 0; < params.length; i++){             publishprogress(params[i]);         }          return "done";      }       @override      protected void onprogressupdate(integer... values) {         // todo auto-generated method stub          super.onprogressupdate(values);         rl_3.setbackgroundcolor(color.parsecolor(values[i]));     }

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