How Android asynchronously updates the UI using the Asynctask asynchronous task

due to performance requirements, Android requirements can only be UI Update in Thread UI that you want to update in other threads UI , let us introduce a way: Use Asynctask Asynchronous Tasks .

in this way, the following updates a TextView :

Note: Updating the UI can only be done in the OnPostExecute (String result) method.

package com.example.runonuithreadtest; import android.app.activity; import  android.os.asynctask; import android.os.bundle; import android.widget.textview;  public class mainactivity extends activity { private textview tv;   @Override  protected void oncreate (bundle savedinstancestate)  {    super.oncreate (savedinstancestate);    setcontentview (R.layout.activity_main);    tv =  (TextView)  findviewbyid (r.id.tv);    new yibu (). Execute ();  }  class Yibu extends AsyncTask<String, String, String> {     @Override    protected string doinbackground (string... params)  {     try {     thread.sleep (;    } ) catch  (interruptedexception e)  {     // TODO Auto-generated catch block      e.printstacktrace ();    }    return null;    }    @Override    protected void onpostexecute (String result)  {    // TODO Auto-generated method stub     Tv.settext ("Updated TextView");    } } }

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How Android asynchronously updates the UI using the Asynctask asynchronous task