Android开发更新UI的几种方式

1、runOnUiThread

2、handler post

3、handler sendmessage

4、view post

　xml布局文件：　　　　　　　　

　　<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
　　xmlns:tools="http://schemas.android.com/tools"
　　android:layout_width="match_parent"
　　android:layout_height="match_parent"
　　android:paddingBottom="@dimen/activity_vertical_margin"
　　android:paddingLeft="@dimen/activity_horizontal_margin"
　　android:paddingRight="@dimen/activity_horizontal_margin"
　　android:paddingTop="@dimen/activity_vertical_margin"
　　tools:context="com.example.handlerui.MainActivity" >

　　<TextView
　　android:id="@+id/textView"
　　android:layout_width="wrap_content"
　　android:layout_height="wrap_content"
　　android:textSize="50sp"
　　android:text="@string/hello_world" />

　　</RelativeLayout>

　　MainActivity.java

　　

package com.example.handlerui;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {

private TextView textView;

private Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
//textView.setText("OK");	//使用handler2更新UI的时候去掉注释

　　　　　　};

};

private void handler1(){
handler.post(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
textView.setText("OK");
}
});
}

private void handler2(){
handler.sendEmptyMessage(1);
}

private void updateUi(){
runOnUiThread(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
textView.setText("OK");
}
});
}

private void viewUI(){
textView.post(new Runnable() {

@Override
public void run() {
// TODO Auto-generated method stub
textView.setText("OK");
}
});
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.textView);
new Thread(){
public void run() {
try {
Thread.sleep(2000);
//handler1();
handler2();
//updateUi();
//viewUI();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

};
}.start();
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}