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);    }}