HelloWorld

package com.example.helloword;

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

public class HelloWordActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //使用hellworld.xml 文件定义的界面布局
        setContentView(R.layout.hello_word);
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.hello_word, menu);
        return true;
    }
    
    public void clickHandler(View source){
    	//获取UI界面中ID为R.id.show的文本框
    	TextView tv=(TextView)findViewById(R.id.show);
    	//改变文本框的内容
    	tv.setText("Hello Android-"+new java.util.Date());
    	
    	
    }
    
}