Android Four ways to update the UI asynchronously _android

Everyone knows that because of performance requirements, Android requires that the UI be updated only in the UI thread, and there are roughly 4 ways to update the UI in other threads, using four different ways to update a textview.
1. Use the handler message passing mechanism

Package com.example.runonuithreadtest;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.os.Handler;
Import Android.widget.TextView;
public class Mainactivity extends activity {
 private TextView TV;
 Handler Handler = new Handler ()
 {public
 void Handlemessage (Android.os.Message msg) {
  if (msg.what==0x123)
  {
  Tv.settext ("Updated TextView");
 }}; @Override
 protected void onCreate (Bundle savedinstancestate) {
 super.oncreate (savedinstancestate);
 Setcontentview (r.layout.activity_main);
 TV = (TextView) Findviewbyid (r.id.tv);
 New Mythread (). Start ();
 Class Mythread extends Thread
 {
 @Override public
 void Run () {
  //delay two seconds to update
  try {
  Thread.Sleep ();
  } catch (Interruptedexception e) {
  //TODO auto-generated catch block
  e.printstacktrace ();
  }
  Handler.sendemptymessage (0x123);}}

2. Using the Asynctask asynchronous task (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< C22/>e.printstacktrace ();
  }
  return null;
 }
 @Override
 protected void OnPostExecute (String result) {
  //TODO auto-generated the method stub
  Tv.settext (" Updated TextView ");}}
 }

3. Using the Runonuithread (action) method

Package com.example.runonuithreadtest;
Import android.app.Activity;
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 Mythread (). Start ();
 Class Mythread extends Thread
 {
 @Override public
 void Run () {
  runonuithread (new Runnable ()
  { @Override public
  Void Run () {
   //TODO auto-generated method stub
   try {
    //delay two seconds update
    Thread.Sleep ( );
   } catch (Interruptedexception e) {
    e.printstacktrace ();
   }
   Tv.settext ("Updated TextView");}}
  }

4. Using the handler post (Runnabel R) method

Package com.example.runonuithreadtest;
Import android.app.Activity;
Import Android.os.Bundle;
Import Android.os.Handler;
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);
 Handler Handler = new Handler ();
 Handler.post (New Runnable () {
  @Override public
  void Run () {
  try {
   //delay two seconds update
   Thread.Sleep ( );
  } catch (Interruptedexception e) {
   e.printstacktrace ();
  }
  Tv.settext ("Updated TextView");}}

The above is the four kinds of Android asynchronous update UI way, hope to help everyone's learning.