android小例程之显示日期和时间

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给大家入门的小例子
java文件:

package com.example.mydatetime;

import java.text.SimpleDateFormat;
import java.util.Date;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		Button btnShowDate = (Button) findViewById(R.id.btnShowDate);
		Button btnShowTime = (Button) findViewById(R.id.btnShowTime);
		Button btnActivity = (Button) findViewById(R.id.btnActivity);
		
		btnShowDate.setOnClickListener(this);
		btnShowTime.setOnClickListener(this);
		btnActivity.setOnClickListener(this);
	}

	@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;
	}
	
	public void showDialog(String title, String msg){
		AlertDialog.Builder builder = new AlertDialog.Builder(this);
		builder.setIcon(android.R.drawable.ic_dialog_info);
		builder.setTitle(title);
		builder.setMessage(msg);
		builder.setPositiveButton("确定", null);
		builder.create().show();
		Intent intent;
	}

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		switch (v.getId()) {
		case R.id.btnShowDate:
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
			showDialog("当前日期",sdf.format(new Date()));
			break;
			
		case R.id.btnShowTime:
			SimpleDateFormat sdfTime = new SimpleDateFormat("HH:mm:ss");
			showDialog("当前时间", sdfTime.format(new Date()));
			break;
		case R.id.btnActivity:
			Intent intent = new Intent(this, TabActivity01.class);
			startActivity(intent);
		default:
			break;
		}
		
	}

}

完整项目下载地址:
http://pan.baidu.com/s/1gdJuRXx

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