更新UI的四种方式

package com.example.handler_test2;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;

public class Five extends Activity {
	private TextView textView;
	private Handler handler = new Handler() {
		public void handleMessage(android.os.Message msg) {
                        textView.setText("ok");
		};
	};

	
	private void handler1(){
//		post方法执行runnable中的代码
		handler.post(new Runnable() {
			/*
			 * public final boolean post(Runnable r){
			 * return sendMessageDelayed(getPostMessage(r),0);
			 * }
			 * private static Message getPostMessage(Runnable){
			 * Message m= Message.obtain();
			 * m.callback = r;
			 * return m;
			 * }
			 * */
			@Override
			public void run() {
				textView.setText("ok");
				
			}
		});
		
	}
	//
	private void handler2(){
		handler.sendEmptyMessage(1);
	}
	private void updateUI(){
		/*public final void runOnUiThread(Runnable action){
			if(Thread.currentThread()! = mUiThread){
				mHandler.post(action);
			}else{
				action.run();
			}
		}*/
		runOnUiThread(new Runnable() {
			
			@Override
			public void run() {
			// TODO Auto-generated method stub
				textView.setText("ok");
			}
		});
	}
	private void viewUI(){
		/*public boolean post(Runnable action){
		  final AttachInfo attachInfo = mAttachInfo;
		  if(attachInfo ! = null){
		  return attachInfo.mHandler.post(action);
		  }	
		  ViewRootInpl.getRunQueue().post(action);
		  return true;
		}*/
		textView.post(new Runnable() {
			
			@Override
			public void run() {
				// TODO Auto-generated method stub
				textView.setText("ok");
			}
		});
	}
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.five);
		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();
	}
}