Android thread Update UI error: Can ' t create handler inside thread that have not called looper.prepare ()

There is a button in the mainactivity that binds the Save method

 Public void Save (View view) {        = titletext.gettext (). toString ();         = Lengthtext.gettext (). toString ();         = Executors.newcachedthreadpool ();        Exec.execute (new  Newsservice (Getapplicationcontext (), title,timelength));    

Newsservice Code:

@Override Public voidrun () {String path= "Http://192.168.0.102:8080/videonews/ManageServlet"; Map<String,String> params =NewHashmap<string,string>(); Params.put ("Title", title); Params.put ("Timelength", timelength); Booleanresult=false; Try{result=sendgetrequest (Path,params); } Catch(Exception e) {e.printstacktrace (); }        if(Result) {Toast.maketext (context, r.string.success, Toast.length_long). Show (); } Else{toast.maketext (Context,r.string.error,toast.length_long). Show (); }    }

Error:

04-18 13:06:36.191 2284-2305/test.example.com.newsmanage e/androidruntime:fatal exception:pool-1-thread-1Process:test.example.com.newsmanage, PID:2284Java.lang.RuntimeException:Can' t create handler inside thread that have not called looper.prepare () at android.os.handler.<init> (handler . java:200) at Android.os.Handler.<init> (handler.java:114) at Android.widget.toast$tn.<init> (toast.java:336) at Android.widget.Toast.<init> (toast.java:100) at Android.widget.Toast.makeText (Toast.java:250) at Android.widget.Toast.makeText (Toast.java:277) at Test.example.com.service.NewsService.run (Newsservice.java:86) at Java.util.concurrent.ThreadPoolExecutor.runWorker (Threadpoolexecutor.java:1112) at Java.util.concurrent.threadpoolexecutor$worker.run (Threadpoolexecutor.java:48V) at Java.lang.Thread.run (Thread.java:818)

Checked the data, said that Android can not be in the child thread to refresh the UI. If you want to implement this function. The recommendation is to add hander to your child thread to send a message to update the thread.

This is OK.

1. Add the following code to the activity

PrivateHandler MyHandler =NewHandler () {@Override Public voidhandlemessage (Message msg) {Switch(msg.what) { Case0x00: Toast.maketext (Getapplicationcontext (),"Save Success", Toast.length_short). Show ();  Break; default: Toast.maketext (Getapplicationcontext (),"Save Fail", Toast.length_short). Show (); }        }    };

2. When the thread is started, handler is passed in:

Exec.execute (new Newsservice (Getapplicationcontext (), myhandler,title,timelength));

3. In the thread, send a message to handler:

@Override Public voidrun () {String path= "Http://192.168.0.102:8080/videonews/ManageServlet"; Map<String,String> params =NewHashmap<string,string>(); Params.put ("Title", title); Params.put ("Timelength", timelength); Booleanresult=false; Try{result=sendgetrequest (Path,params); } Catch(Exception e) {e.printstacktrace (); } Message msg=NewMessage (); if(Result) msg.what= 0x00; ElseMsg.what= 0x01;    Handler.sendmessage (msg); }

Complete.

Android thread Update UI error: Can ' t create handler inside thread that have not called looper.prepare ()