一共有：
UI主執行緒 activityd的runOnUiThread
handler post
handler sendMessage
view post

下面將我自己已經驗證成功的程式碼貼出了，其實這些方法都是殊途同歸，都是使用了handler，封裝成message進行傳送的：
主程式：

package com.example.handler;

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

public
 
 class FiveActivity extends Activity {

    private TextView tv;
    private Handler handler = new Handler(){
        public void handleMessage(android.os.Message msg) {
            tv.setText("ok2");
        };
    };

    private void handle1(){
        handler.post(new Runnable() {

            @Override
 

            public void run() {
                tv.setText("ok");

            }
        });
    }

    private void handle2(){
        handler.sendEmptyMessage(1);

    }

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

            @Override
            public void run() {
                // TODO Auto-generated method stub
 

                tv.setText("ok3");
            }
        });
    }

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

            @Override
            public void run() {
                // TODO Auto-generated method stub
                tv.setText("ok4");
            }
        });
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fiva);
        tv = (TextView) findViewById(R.id.tv);

        new Thread(){
            public void run() {
                try {
                    Thread.sleep(2000);
                    viewUI();

                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            };
        }.start();;
    }

}

佈局檔案：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv"
        android:textSize="40sp"/>


</LinearLayout>