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Android 应用开发基础，Activity的使用和Layout布局设置(Android Develop Code)

摘要:Java源码,初学实例,时间操作java.util 包中提供了一个Calendar 类，可以用来显示和设置时间，本例将演示这个类的具体使用方法。效果如图所示，在窗口上部的文本框中可以设置新的年月日时分秒，然后按下“Get Time”按钮后，新的时间将显示在窗口下部的标签上。

此示例程序适用于omnikey 5321智能卡读卡器。用java编程开发。来自HID Global的示例

Android 实现图像的灰度化和二值化

本文实现BP神经网络算法，首先通过训练数据集，然后实现对输入数据是智能判定。

这个程序实现了 spinner 动态添加和删除(This program implements the spinner dynamically add and remove)

自己闲时网上找的改的陌陌的客户端，UI界面基本都有，可以作为学习的参考(When I am free, I can find some new clients on the internet. The UI interface is basically available, which can be used as a reference for learning.)

基于wifi的Android文件传输小程序，包含了WIFI的搜索、连接、检验等功能，书写比较规范，聊天信息的传输使用UDP协议，文件传输使用TCP协议

一款还不错的静态壁纸代码 核心代码：package com.example.wallpaperchange;import android.os.Bundle;import android.app.Activity;import android.app.AlarmManager;import android.app.PendingIntent;import android.app.Service;import android.content.Intent;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast; public class MainActivity extends Activity { AlarmManager aManager; Button start,stop; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); start = (Button)findViewById(R.id.start); stop = (Button)findViewById(R.id.stop); aManager = (AlarmManager)getSystemService(Service.ALARM_SERVICE); //指定ChangeService组件 Intent intent = new Intent(MainActivity.this,ChangeService.class); //创建PendingIntent对象 final PendingIntent pi = PendingIntent.getService( MainActivity.this, 0, intent, 0); start.setOnClickListener(new OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub aManager.setRepeating(AlarmManager.RTC_WAKEUP, 0, 5000, pi); start.setEnabled(false); stop.setEnabled(true); Toast.makeText(MainActivity.this, "壁纸定时更换启动成功", 5000).show(); } }); stop.setOnClickListener(new OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub start.setEnabled(true); stop.setEnabled(false); aManager.cancel(pi); } }); } }

说明：  宝淘在线商城网站致力于向用户提供产品展示以及以购物为核心的网上购物服务，开发人员需要通过后台商家管理将自己的产品展现给客户，让客户可以通过网站便能自由的浏览并选择购买商品。在线商城共分两个部分，一部分是面向用户的部分，包括：登陆网站、用户注册成为会员（发表帖子）、浏览网站商品、选择商品加入购物车、购物车管理（删除、修改操作）、提交订单、付款、对购买后的商品进行评价等操作；另外一部分是面向后台商城管理部分，这部分的内容包括：商家注册、产品的添加、删除、?查询、订单的管理、对商家的管理（仅限超级管理员）等。(Baotao online mall website is dedicated to providing users with product display and online shopping services with shopping as the core. Developers need to show their products to customers through background business management, so that customers can browse and choose to buy products freely through the website. The online shopping mall is divided into two parts, one is for users, including: log on to the website, register as a member (post), browse the website products, select products to join the shopping cart, shopping cart management (delete, modify operations), submit orders, pay, evaluate the purchased products, etc.; the other part is for the background shopping mall management department This part includes: business registration, product addition, deletion, query, order management, business management (super administrator only), etc.)