Four Ways for Android to Update UI Asynchronous

As we all know, due to performance requirements, android requires that UI can only be updated in UI threads. There are roughly four ways to update UI in other threads, and the following four ways are used to update one TextView.
1. Use the Handler messaging 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 updates by two seconds 
  try {
  Thread.sleep(2000);
  } catch (InterruptedException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
  }
  handler.sendEmptyMessage(0x123);
 }
 }
}

2. Use the AsyncTask asynchronous task (update UI only 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(2000);
  } 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");
 }
 }
}

3. Use 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 updates by two seconds 
    Thread.sleep(2000);
   } catch (InterruptedException e) {
    e.printStackTrace();
   }
   tv.setText(" Updated TextView");
  }
  });
 }
 }
}

4. post (Runnabel r) method using Handler

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 updates by two seconds 
   Thread.sleep(2000);
  } catch (InterruptedException e) {
   e.printStackTrace();
  }
  tv.setText(" Updated TextView");
  }
 });
 }
}

These are four ways for Android to update UI asynchronously, hoping to help everyone's study.