Android安卓实战项目（1）---一个汽车销售APP，有汽车列表页、汽车详情页、贷款计算页3个界面。

Bertha 。 2023-10-12 15:46 33阅读 0赞

Android开发实战设计并实现一个汽车销售APP，要求至少有汽车列表页、汽车详情页、贷款计算页3个界面。

实现结果：

![4e08581dc7992b6c5f8b9555f7ed8c3][]

![5d4d51a8b2991b4215ad37f29af73fd][]

![aa8b838c52ca8dc8bbcc92f2ca788bd][]

1.计算金额界面

package com.car.car
    
    import android.os.Bundle
    import android.view.View
    import android.widget.*
    import androidx.appcompat.app.AppCompatActivity
    
    /**
     * 计算金额界面
     */
    class CalculateActivity : AppCompatActivity() {
        private  var  dividel:Boolean=true
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_calculate_wlf)
             //获取传递过来车辆信息
            var carBean:CarBean = intent.getSerializableExtra("car") as CarBean
    
            //显示车辆价格
            var et_price = findViewById<TextView>(R.id.et_price)
            et_price.setText("￥"+(carBean.price!!.toDouble()*10000))
    
            //初始化布局
            var seek_DisCount_Percent = findViewById<SeekBar>(R.id.seek_DisCount_Percent)
            var tv_DisCount_Account = findViewById<TextView>(R.id.tv_DisCount_Account)
            var tv_Total = findViewById<TextView>(R.id.tv_Total)
            var tv_percent = findViewById<TextView>(R.id.tv_percent)
            var rg = findViewById<RadioGroup>(R.id.rg)
            var rb_no = findViewById<RadioButton>(R.id.rb_no)
            var rb_yes = findViewById<RadioButton>(R.id.rb_yes)
            var tv_DownPayment = findViewById<TextView>(R.id.tv_DownPayment)
            var tv_Loan = findViewById<TextView>(R.id.tv_Loan)
            var sp_Periods = findViewById<Spinner>(R.id.sp_Periods)
            var tv_period = findViewById<TextView>(R.id.tv_period)
    
    
            //给下拉框添加监听事件  选择分期时间
            sp_Periods.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
                override fun onItemSelected(adapterView: AdapterView<*>, view: View, i: Int, l: Long) {
                    //判断是否分期 ,如果分期 计算
                  if (dividel){
                      //首付费用 分期费用各一半
                      tv_DownPayment.setText("￥"+(carBean.price!!.toDouble()*10000/2))
                      //分期费用
                      tv_Loan.setText("￥"+(carBean.price!!.toDouble()*10000/2))
                        //6 个月  12个月  24个月  每期的费用
                      if (i==0){
                          tv_period.setText("￥"+(carBean.price!!.toDouble()*10000/2/6))
                      }else if (i==1){
                          tv_period.setText("￥"+(carBean.price!!.toDouble()*10000/2/12))
                      }else if (i==2){
                          tv_period.setText("￥"+(carBean.price!!.toDouble()*10000/2/24))
                      }
                  }
    
                }
    
                override fun onNothingSelected(adapterView: AdapterView<*>?) {}
            }
    
            //是否分期切换监听
            rg.setOnCheckedChangeListener { group, checkedId ->
                //分期
                if (checkedId == R.id.rb_yes) {
                    dividel = true
                    tv_DownPayment.setText("￥"+(carBean.price!!.toDouble()*10000/2))
                    tv_Loan.setText("￥"+(carBean.price!!.toDouble()*10000/2))
    
                    val i=sp_Periods.selectedItemPosition  //当前选中期数
    
                    //每期费用
                    if (i==0){
                        tv_period.setText("￥"+(carBean.price!!.toDouble()*10000/2/6))
                    }else if (i==1){
                        tv_period.setText("￥"+(carBean.price!!.toDouble()*10000/2/12))
                    }else if (i==2){
                        tv_Loan.setText("￥"+(carBean.price!!.toDouble()*10000/2/24))
                    }
                } else {
                    //不分期
                    dividel = false
                    tv_DownPayment.setText("")
                    tv_Loan.setText("")
                    //每期费用
                    tv_period.setText("")
    
                }
            }
            /**
             * 监听优惠力度 当优惠力度发生改变的时候 实际总的金额也变化
             */
            seek_DisCount_Percent.setOnSeekBarChangeListener(object :SeekBar.OnSeekBarChangeListener{
                override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
    
                    tv_percent.setText(""+(progress)+"%")
                    tv_Total.setText("￥"+(carBean.price!!.toDouble()*10000-carBean.price!!.toDouble()*10000*progress/100))
                    tv_DisCount_Account.setText("￥"+(carBean.price!!.toDouble()*10000*progress/100))
    
                }
    
                override fun onStartTrackingTouch(seekBar: SeekBar?) {
    
                }
    
                override fun onStopTrackingTouch(seekBar: SeekBar?) {
    
                }
    
            })
        }
    }

2.车辆列表适配器

package com.car.car
    
    import android.content.Context
    import android.view.View
    import android.widget.BaseAdapter
    import android.view.ViewGroup
    import android.widget.ImageView
    import android.widget.TextView
    import java.util.ArrayList
    
    /**
     * 车辆列表适配器
     */
    class CarAdapter(context: Context, mData: MutableList<CarBean>) : BaseAdapter() {
        private var data = mData
        private var  mContext=context;
        override fun getCount(): Int {
            return data.size
        }
    
        override fun getItem(position: Int): Any {
            return data[position]
        }
    
        override fun getItemId(position: Int): Long {
            return position.toLong()
        }
    
    
        override fun getView(position: Int, convertView: View?, parent: ViewGroup?): View {
            val   convertView = View.inflate(mContext, R.layout.item_layout_wlf, null)
            var car = this.data[position]
    
            /**
             * 初始化控件
             */
            val  img=convertView.findViewById<ImageView>(R.id.iv_img)  //车辆图片
            val  tv_title=convertView.findViewById<TextView>(R.id.tv_title) //车辆名
            val  tv_mileage=convertView.findViewById<TextView>(R.id.tv_mileage) //公里数
            val  tv_price=convertView.findViewById<TextView>(R.id.tv_price) //车辆价格
            //车辆图片
            img.setImageResource(car.img)
            //车辆名字
            tv_title.text = car.name
            //车辆公里数
            tv_mileage.text = car.describe;
            //车辆价格
            tv_price.text = car.price+"万";
    
            return convertView
        }
    }

3.车辆类

package com.car.car
    
    import java.io.Serializable
    
    /**
     * 车辆类
     */
    class CarBean(id: Int, type: String, name: String, price: String, describe: String, pic: Int) : Serializable {
        var id = id //车辆ID
        var type: String? = type  //车辆类型
        var name: String? = name  //车辆名
        var price: String? = price //车辆价格
        var describe: String? = describe //公里数描述
        var img = pic //车辆图片
    }

4.数据库操作类

package com.car.car
    
    import android.annotation.SuppressLint
    import android.content.ContentValues
    import android.content.Context
    import android.database.Cursor
    import android.database.SQLException
    import android.database.sqlite.SQLiteDatabase
    import android.database.sqlite.SQLiteOpenHelper
    
    
    /**
     * sqlite 数据库操作类
     */
    class DatabaseUtil
    (
    
        private val mCtx: Context
    ) {
        private var mDbHelper: DatabaseHelper? = null
        private var mDb: SQLiteDatabase? = null
    
    
        private class DatabaseHelper  constructor(context: Context?) :
            SQLiteOpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION) {
    
            override fun onCreate(db: SQLiteDatabase) {
                //创建表
                db.execSQL(CREATE_TABLE)
            }
    
    
            override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int) {
    
            }
        }
    
        /**
         * 打开数据库
         *
         * @return instance of DatabaseUtil
         * @throws SQLException
         */
        @Throws(SQLException::class)
        fun open(): DatabaseUtil {
            mDbHelper = DatabaseHelper(mCtx)
            mDb = mDbHelper!!.writableDatabase
            return this
        }
    
        /**
         * This method is used for closing the connection.
         */
        fun close() {
            mDbHelper!!.close()
        }
    
        /**
         * 插入数据
         *
         * @param name
         * @param grade
         * @return long
         */
        fun insert(type: String?, name: String?, price: String?, describe: String?, img:Int): Long {
            val initialValues = ContentValues()
                    initialValues.put("type", type);
            initialValues.put("name", name);
            initialValues.put("price", price);
            initialValues.put("describe", describe);
            initialValues.put("img", img);
            return mDb!!.insert(DATABASE_TABLE, null, initialValues)
        }
    
        /**
         * 查询全部数据
         */
        @SuppressLint("Range")
        fun queryAllPersonData(): List<CarBean>? {
    
            //查询全部数据
            val cursor: Cursor =
                mDb!!.query(DATABASE_TABLE, null, null, null, null, null, null, null)
            val list: MutableList<CarBean> = ArrayList()
            if (cursor.count > 0) {
                //移动到首位
                cursor.moveToFirst()
                for (i in 0 until cursor.count) {
                    val id = cursor.getInt(cursor.getColumnIndex("id"))
                    val type = cursor.getString(cursor.getColumnIndex("type"))
                    val name = cursor.getString(cursor.getColumnIndex("name"))
                    val price = cursor.getString(cursor.getColumnIndex("price"))
                    val describe = cursor.getString(cursor.getColumnIndex("describe"))
                    val pic = cursor.getInt(cursor.getColumnIndex("img"))
                    val model = CarBean(id,type,name,price,describe,pic)
    
    
                    list.add(model)
                    //移动到下一位
                    cursor.moveToNext()
                }
            }
            cursor.close()
            mDb!!.close()
            return list
        }
    
        /**
         * This method will deleteAll record.
         *
         * @return
         */
        fun deleteAll(): Boolean {
            return mDb!!.delete(DATABASE_TABLE, " 1 ", null) > 0
        }
    
    
        companion object {
            private const val TAG = "DatabaseUtil"
    
            /**
             * Database Name  数据库名
             */
            private const val DATABASE_NAME = "car_data"
    
            /**
             * Database Version  数据库版本
             */
            private const val DATABASE_VERSION = 1
    
            /**
             * Table Name   数据库表名
             */
            private const val DATABASE_TABLE = "tb_car"
    
            /**
             * Table columns  数据库字段名
             */
            const val KEY_ID = "id"
            const val KEY_TYPE = "type"
            const val KEY_NAME = "name"
            const val KEY_PRICE = "price"
            const val KEY_DESCRIBE = "describe"
            const val KEY_IMG = "img"
    
            /**
             * Database creation sql statement
             */
            private const val CREATE_TABLE =
                ("create table " + DATABASE_TABLE + " (" + KEY_ID + " integer primary key autoincrement, "
                        + KEY_TYPE + " text not null, "
                        + KEY_NAME + " text not null, "
                        + KEY_PRICE + " text not null, "
                        + KEY_DESCRIBE + " text not null, "
                        + KEY_IMG + " integer not null);")
        }
    }

5.车辆详情界面

package com.car.car
    
    import android.content.Intent
    import androidx.appcompat.app.AppCompatActivity
    import android.os.Bundle
    import android.widget.Button
    import android.widget.ImageView
    import android.widget.TextView
    
    /**
     * 车辆详情界面
     */
    class DetailsActivity : AppCompatActivity() {
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_details_wlf)
            //获取传递数据
            var carBean:CarBean = intent.getSerializableExtra("car") as CarBean
            //初始化布局
            var iv_img = findViewById<ImageView>(R.id.iv_img)
            var tv_detail_msg = findViewById<TextView>(R.id.tv_detail_msg)
            var bt_buy = findViewById<Button>(R.id.bt_buy)
    
            //显示数据 图片显示和详情
            iv_img.setImageResource(carBean.img)
            tv_detail_msg.setText(carBean.name+carBean.describe+carBean.price+"万")
            //跳转到计算界面
            bt_buy.setOnClickListener {
                val intent = Intent(this, CalculateActivity::class.java);
                intent.putExtra("car", carBean)
                startActivity(intent)
            }
    
        }
    }

6.车辆列表界面

package com.car.car
    
    import android.content.Intent
    import android.os.Bundle
    import android.widget.AdapterView
    import android.widget.ListView
    import androidx.appcompat.app.AppCompatActivity
    
    /**
     * 车辆列表界面
     */
    class MainActivity : AppCompatActivity() {
        private  lateinit var listView: ListView
        private var carAdapter: CarAdapter?=null
        private  var data= mutableListOf<CarBean>()
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            setContentView(R.layout.activity_main_wlf)
            listView = findViewById<ListView>(R.id.lv)
    
            initData()
            //跳转到详情界面
            listView.onItemClickListener =
                AdapterView.OnItemClickListener { adapterView, view, i, l ->
                    //传递车辆信息
                    val intent = Intent(this, DetailsActivity::class.java);
                    intent.putExtra("car", data[i])
                    startActivity(intent)
                }
    
        }
    
        /**
         * 初始化数据
         */
        private fun initData() {
            //数据库开启
            val dbUtil=DatabaseUtil(this);
            dbUtil.open()
            //查询数据库里是否存在数据
            var queryAllPersonData = dbUtil.queryAllPersonData()
    
            //存在数据
            if (null!=queryAllPersonData&&queryAllPersonData.size>0){
                data= queryAllPersonData as MutableList<CarBean>
                //初始化是脾气
                carAdapter = CarAdapter(this,data)
                //设置适配器
                listView.adapter=carAdapter
            }else{
                //不存在 插入3个默认数据
                dbUtil.open()
                //插入数据
                dbUtil.insert("轿车","小鹏汽车P7 2022款","18.5","2023年(700公里)",R.mipmap.img1);
                dbUtil.insert("轿车","保时捷 2021款","158.5","2023年(2700公里)",R.mipmap.img2);
                dbUtil.insert("轿车","别克E5 2023款","20.5","2023年(500公里)",R.mipmap.img3);
                //再次查询数据库  确认查询成功  设置适配器现实数据
                var queryAllPersonData1 = dbUtil.queryAllPersonData()
                data= queryAllPersonData1 as MutableList<CarBean>
                carAdapter = CarAdapter(this,data)
                listView.adapter=carAdapter
            }
    
        }
    }

--------------------

界面设计：

1.金额计算页面：

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:orientation="vertical"
        android:layout_height="match_parent"
        android:padding="20sp"
        tools:context=".CalculateActivity">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="Price"
                android:layout_height="wrap_content"></TextView>
            <EditText
                android:id="@+id/et_price"
                android:layout_width="0dp"
                android:gravity="right|center_vertical"
                android:layout_weight="1"
                android:layout_height="match_parent"></EditText>
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="DisCount Percent"
                android:layout_height="wrap_content"></TextView>
            <SeekBar
                android:id="@+id/seek_DisCount_Percent"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:layout_height="match_parent"></SeekBar>
            <TextView
                android:id="@+id/tv_percent"
    
                android:layout_width="wrap_content"
    
                android:layout_height="wrap_content"></TextView>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="DisCount Account"
                android:layout_height="wrap_content"></TextView>
            <TextView
                android:id="@+id/tv_DisCount_Account"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:gravity="right|center_vertical"
                android:layout_height="match_parent"></TextView>
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="Total"
                android:layout_height="wrap_content"></TextView>
            <TextView
                android:id="@+id/tv_Total"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:gravity="right|center_vertical"
                android:layout_height="match_parent"></TextView>
        </LinearLayout>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:layout_marginTop="40dp"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="Dividel?"
                android:layout_gravity="center_vertical"
                android:layout_height="wrap_content"></TextView>
            <RadioGroup
                android:id="@+id/rg"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:gravity="center"
                android:orientation="vertical"
                android:layout_height="wrap_content">
    
                <RadioButton
                    android:id="@+id/rb_no"
                    android:layout_width="wrap_content"
                    android:text="No"
                    android:layout_height="wrap_content"></RadioButton>
                <RadioButton
                    android:id="@+id/rb_yes"
                    android:layout_width="wrap_content"
                    android:text="Yes"
                    android:checked="true"
                    android:layout_height="wrap_content"></RadioButton>
            </RadioGroup>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="DownPayment"
                android:layout_height="wrap_content"></TextView>
            <TextView
                android:id="@+id/tv_DownPayment"
                android:layout_width="0dp"
                android:gravity="right|center_vertical"
                android:layout_weight="1"
                android:layout_height="match_parent"></TextView>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="Loan"
                android:layout_height="wrap_content"></TextView>
            <TextView
                android:id="@+id/tv_Loan"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:gravity="right|center_vertical"
                android:layout_height="match_parent"></TextView>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="Periods"
                android:layout_height="wrap_content"></TextView>
            <Spinner
                android:id="@+id/sp_Periods"
                android:layout_width="0dp"
                android:gravity="right"
                android:layout_marginLeft="20sp"
                android:entries="@array/phones_array"
                android:layout_weight="1"
                android:layout_height="match_parent"></Spinner>
        </LinearLayout>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="45dp"
            android:gravity="center_vertical"
            android:orientation="horizontal"
            >
            <TextView
    
                android:layout_width="wrap_content"
                android:text="Per period"
                android:layout_height="wrap_content"></TextView>
            <TextView
                android:id="@+id/tv_period"
                android:layout_width="0dp"
                android:layout_weight="1"
                android:gravity="right|center_vertical"
                android:layout_height="match_parent"></TextView>
        </LinearLayout>
    </LinearLayout>

2.立即购买控件

3.车辆展示页面

<?xml version="1.0" encoding="utf-8"?>
    <ListView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
         android:id="@+id/lv"
        android:layout_height="match_parent"
        tools:context=".MainActivity">
    
    
    </ListView>

4.布局

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:layout_height="wrap_content">
    
        <ImageView
            android:id="@+id/iv_img"
            android:layout_width="120dp"
            android:layout_height="120dp"></ImageView>
        <LinearLayout
            android:layout_width="match_parent"
            android:orientation="vertical"
            android:paddingLeft="10dp"
            android:layout_height="120dp">
            <TextView
                android:id="@+id/tv_title"
                android:layout_width="match_parent"
                android:gravity="center_vertical"
                android:textColor="#1677C5"
                android:textSize="16sp"
                android:layout_height="45dp"></TextView>
            <TextView
                android:id="@+id/tv_mileage"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:layout_weight="1"
                android:textColor="#505151"
                android:gravity="center_vertical"
                android:textSize="12sp"
                ></TextView>
            <TextView
                android:id="@+id/tv_price"
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:textColor="#131313"
                android:gravity="center_vertical"
                android:textSize="18sp"
                android:layout_weight="1"
                ></TextView>
        </LinearLayout>
    </LinearLayout>

--------------------

配置文件：

strings.xml

<resources>
        <string name="app_name">汽车销售APP</string>
    
        <string-array name = "phones_array">
            <item>6 months</item>
            <item>12 months</item>
            <item>24 months</item>
        </string-array>
    </resources>

themes.xml

<resources xmlns:tools="http://schemas.android.com/tools">
        
        <style name="Theme.Car" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
            
            <item name="colorPrimary">@color/purple_500</item>
            <item name="colorPrimaryVariant">@color/purple_700</item>
            <item name="colorOnPrimary">@color/white</item>
            
            <item name="colorSecondary">@color/teal_200</item>
            <item name="colorSecondaryVariant">@color/teal_700</item>
            <item name="colorOnSecondary">@color/black</item>
            
            <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
            
        </style>
    </resources>

themes.xml

## 源码： ##

链接：https://pan.baidu.com/s/1tvjdKUaxJ63A7p9d2KrE9w?pwd=jynl  
提取码：jynl  
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