安卓APP源码和设计报告——智能垃圾桶

课程名称： 移动互联网应用开发

实验名称：

姓名/学号：

专业/班级：

指导教师：

实验时间：

一、案例功能需求

该系统是了解垃圾分类以及物品查询属于哪类垃圾的智能化APP。该系统可以实现用户登陆注册，登录成功后用到Frament分为三页，首页、分类百科和搜索实现的。首页可以查看四大类垃圾分类详情，分类百科可以拍照上传物品然后识别出属于什么类别的垃圾，搜索可以实现你想要搜索的商品是什么类型的垃圾。如下图，图1.1。

图1.1

二、文件结构

1、开发环境

Windows10 x64、Android Studio 2020.3.1 Patch2

2、运行环境

Android 11(R) skd14

3、是否需要联网

否

三、项目配置文件及工程结构

1、工程配置文件

表一：工程文件位置

图一，图二：manifest

2、工程结构目录

图三：java工程结构

图四：layout工程结构

图五：drawable工程目录

三、程序详细分析

1、项目源码中含有数据库frgment、RALD数据库连接、数字转换等。

2、frgment：（3）将Fragment加入到动态数组ArrayList<Fragment>中，实例化适配器，并绑定到ViewPager上，设置ViewPager2切换监听器，改变下方按钮图片——initFragment();

RALD数据库连接：

public class RALDbConnect extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "UserInfo";// name of database we want to create
public static final String TABLE_NAME = "mytable"; // name of table we want to create
public static final int DATABASE_VERSION = 1; // version of our database it can be any no
// column names we want in our table
public static final String UID = "_id" ; // primary key field of table(ist column)(_id)
public static final String USERNAME = "Username" ; // 2nd column(Uname) of table
public static final String PASSWORD = "Password" ; // 3rd column (Password) of table
public static final String EMAIL="Email";
public static final String PHONENUMBER="Phonenumber";
public static final String ADDRESS="Address";

private static final String CREATE_TABLE = " CREATE TABLE " + TABLE_NAME + " ( " + UID +
" INTEGER PRIMARY KEY AUTOINCREMENT, " + USERNAME + " VARCHAR(255) , "
+ PASSWORD + " VARCHAR(255)," + EMAIL + " VARCHAR(255),"+ PHONENUMBER + " VARCHAR(255)," + ADDRESS + " VARCHAR(255));";

private static final String DROP_TABLE = " DROP TABLE IF EXISTS " + TABLE_NAME ;
private Context context;
public RALDbConnect(Context context)
{
super(context, DATABASE_NAME, null,DATABASE_VERSION);
this.context = context ;
}

// oncreate() will be called to create database first time it is called only once
@Override
public void onCreate(SQLiteDatabase db) {
try
{
db.execSQL(CREATE_TABLE); // used to create table into database
}
catch(Exception ex)
{
Log.e("myerror", ex.getMessage());
}
}
// this method will call when we upgrade our database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
try
{
Log.i("currentDb", "upgraded");
db.execSQL(DROP_TABLE);
onCreate(db);
}
catch(Exception ex)
{
Log.e("error on Upgreade", ex.getMessage());
}

}

数字转换：

public class DigitalConversion {

private static String nums[] = {"零", "一", "二", "三", "四", "五", "六", "七", "八", "九"};

private static String pos_units[] = {"", "十", "百", "千"};

private static String weight_units[] = {"", "万", "亿"};

/**
* 数字转汉字【新】
*
* @param num
* @return
*/
public static String numberToChinese(int num) {
if (num == 0) {
return "零";
}

int weigth = 0;//节权位
String chinese = "";
String chinese_section = "";
boolean setZero = false;//下一小节是否需要零，第一次没有上一小节所以为false
while (num > 0) {
int section = num % 10000;//得到最后面的小节
if (setZero) {//判断上一小节的千位是否为零，是就设置零
chinese = nums[0] + chinese;
}
chinese_section = sectionTrans(section);
if (section != 0) {//判断是都加节权位
chinese_section = chinese_section + weight_units[weigth];
}
chinese = chinese_section + chinese;
chinese_section = "";
//Log.d("TAG", chinese_section);

setZero = (section < 1000) && (section > 0);
num = num / 10000;
weigth++;
}
if ((chinese.length() == 2 || (chinese.length() == 3)) && chinese.contains("一十")) {
chinese = chinese.substring(1, chinese.length());
}
if (chinese.indexOf("一十") == 0) {
chinese = chinese.replaceFirst("一十", "十");
}

return chinese;
}

/**
* 将每段数字转汉子
*
* @param section
* @return
*/
public static String sectionTrans(int section) {
StringBuilder section_chinese = new StringBuilder();
int pos = 0;//小节内部权位的计数器
boolean zero = true;//小节内部的置零判断，每一个小节只能有一个零。
while (section > 0) {
int v = section % 10;//得到最后一个数
if (v == 0) {
if (!zero) {
zero = true;//需要补零的操作，确保对连续多个零只是输出一个
section_chinese.insert(0, nums[0]);
}
} else {
zero = false;//有非零数字就把置
section_chinese.insert(0, pos_units[pos]);
section_chinese.insert(0, nums[v]);
}
pos++;
section = section / 10;
}
return section_chinese.toString();
}
}