08Kotlin项目实操之收藏业务
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（1）一个人只要自己不放弃自己，整个世界也不会放弃你.
（2）天生我才必有大用
（3）不能忍受学习之苦就一定要忍受生活之苦，这是多么痛苦而深刻的领悟.
（4）做难事必有所得
（5）精神乃真正的刀锋
（6）战胜对手有两次，第一次在内心中.
（7）好好活就是做有意义的事情.
（8）亡羊补牢，为时未晚
（9）科技领域，没有捷径与投机取巧。
（10）有实力，一年365天都是应聘的旺季，没实力，天天都是应聘的淡季。
（11）基础不牢，地动天摇
（12）写博客初心：成长自己，辅助他人。当某一天离开人世，希望博客中的思想还能帮人指引方向.
（13）编写实属不易，若喜欢或者对你有帮助记得点赞+关注或者收藏哦~
【08】Kotlin项目实操之收藏业务
文章目录
1.View层
1.1BaseFragment基类
/**
* @author XiongJie
* @version appVer
* @Package com.gdc.kotlinproject.base
* @file
* @Description:所有Fragment的父类
* @date 2021-6-4 19:14
* @since appVer
*/
abstract class BaseFragment<P> :Fragment() where P:IBasePresenter
//1.presenter对象属性
lateinit var p:P
//1.Fragment需要拿到 Activity
private lateinit var mActivity: AppCompatActivity
//1.onAttach表示Fragment赋加到Activity上的时候
override fun onAttach(context: Context)
super.onAttach(context)
// Java
// mActivity = (AppCompatActivity) context
// KT
mActivity = context as AppCompatActivity
override fun onCreate(savedInstanceState: Bundle?)
super.onCreate(savedInstanceState)
p = getPresenter()
//1.由子类具体负责创建
abstract fun getPresenter() : P
//1.资源释放
override fun onDestroy()
super.onDestroy()
recycle()
//1.
abstract fun createOK()
//1.资源释放
abstract fun recycle()
//1.隐藏ActionBar
fun hideActionBar() : Unit
val actionBar : ActionBar? = mActivity?.supportActionBar
actionBar?.hide()
//1.显示ActionBar
fun showActionBar() : Unit
mActivity?.supportActionBar?.show()
1.2页面
package com.gdc.kotlinproject.modules.collect
import android.os.Bundle
import android.util.Log
import android.view.*
import android.widget.Toast
import com.gdc.kotlinproject.R
import com.gdc.kotlinproject.adapter.CollectAdapter
import com.gdc.kotlinproject.base.BaseFragment
import com.gdc.kotlinproject.config.Flag
import com.gdc.kotlinproject.database.Student
import com.gdc.kotlinproject.modules.collect.interfaces.CollectView
import com.gdc.kotlinproject.modules.collect.interfaces.CollectPresenter
import kotlinx.android.synthetic.main.fragment_collect.*
/**
* @author XiongJie
* @version appVer
* @Package com.gdc.kotlinproject.modules.collect
* @file
* @Description:View的实现层
* @date 2021-6-4 18:15
* @since appVer
*/
class CollectFragment : BaseFragment<CollectPresenter>(),CollectView
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View?
Toast.makeText(activity, "收藏", Toast.LENGTH_SHORT).show()
val root: View? = inflater.inflate(R.layout.fragment_collect, container, false)
//1.如果root不为空，则使用root,为空，则使用后面的
return root ?: super.onCreateView(inflater, container, savedInstanceState)
//类似于java构造代码块
init
//设置菜单
setHasOptionsMenu(true)
override fun onViewCreated(view: View, savedInstanceState: Bundle?)
super.onViewCreated(view, savedInstanceState)
addData.setOnClickListener
val names = arrayOf<String>(
"乔峰",
"段誉",
"虚竹",
"慕容复",
"张三",
"李四",
"王五",
"赵六",
"初七",
"杜子腾",
"王小二",
"李大奇"
)
val ages = arrayOf<Int> (
43,
24,
19,
83,
64,
21,
56,
32,
17,
32,
45,
14
)
//1.批量插入数据到数据库
for(index in names.indices)
val stu = Student(names[index],ages[index])
p.requestInsert(stu)
/**
* 全部删除动作
*/
clearData.setOnClickListener
p.requestDeleteAll()
/**
* 1.个人Fragment的菜单
*/
override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater)
super.onCreateOptionsMenu(menu, inflater)
inflater.inflate(R.menu.personal_menu, menu)
override fun showResultSuccess(result: List<Student>?)
Log.d(Flag.TAG,"showResultSuccess result: $result.toString() , LV:$recyclerView ")
//将数据交给recycleView显示
val adapter = CollectAdapter()
if(null != result)
adapter.allStudents = result;
recyclerView.adapter = adapter
//1.增、删、改的反馈，即做完之后重新刷新请求所有数据
override fun showResult(result: Boolean)
if (result) p.requestQueryAll()
//1.创建Presenter对象
override fun getPresenter(): CollectPresenter = CollectPresenterImpl(this)
override fun createOK()
//1.查询所有
p.requestQueryAll()
override fun recycle()
p.unAttachView()
1.3RecycleView的Adapter
/**
* @author XiongJie
* @version appVer
* @Package com.gdc.kotlinproject.adapter
* @file
* @Description:
* @date 2021-6-4 19:46
* @since appVer
*/
class CollectAdapter : RecyclerView.Adapter<CollectAdapter.MyViewHolder>()
//接收数据库的数据
var allStudents:List<Student> = ArrayList()
/**
* 内部类
*/
inner class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)
var tvID: TextView = itemView.findViewById(R.id.tv_id)
var tvName: TextView = itemView.findViewById(R.id.tv_name)
var tvAge: TextView = itemView.findViewById(R.id.tv_age)
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder
//1.Item布局
val layoutInflater:LayoutInflater = LayoutInflater.from(parent.context)
val itemView:View = layoutInflater.inflate(R.layout.item_collect_list,parent,false)
return MyViewHolder(itemView)
override fun getItemCount(): Int = allStudents.size
override fun onBindViewHolder(holder: MyViewHolder, position: Int)
val student : Student = allStudents[position]
holder.tvID.text = "$position + 1"
holder.tvName.text = student.name
holder.tvAge.text = "$student.age"
// 点击Item的时候，可以跳转到 有道词典 查询
holder.itemView.setOnClickListener
val uri: Uri = Uri.parse("https://m.youdao.com/dict?le=eng&q=" + holder.tvName.text)
val intent: Intent = Intent(Intent.ACTION_VIEW)
intent.data = uri;
holder.itemView.context.startActivity(intent)
2.Presenter层
class CollectPresenterImpl(var view : CollectView?):CollectPresenter,CollectPresenter.OnCollectListener,CollectPresenter.OnCollectionResponseListener
//1.Model层
private val model:CollectModel = CollectModelImpl()
//1.插入
//1.1*students是将可变参数取出来之后丢给Model层的可变参数
override fun requestInsert(vararg students: Student)
model.requestInsert(this,*students)
//1.修改
override fun requestUpdate(vararg students: Student)
model.requestUpdate(this,*students)
//1.删除
override fun requestDelete(vararg students: Student)
model.requestDelete(this,*students)
//1.删除全部
override fun requestDeleteAll()
model.requestDeleteAll(this)
//1.查询全部
override fun requestQueryAll()
model.requestQueryAll(this)
override fun unAttachView()
view == null
//1.显示结果
override fun showResultSuccess(result: List<Student> ?)
view?.showResultSuccess(result)
//1.显示增、删、改结果
override fun showIUD(iudResult: Boolean)
view?.showResult(iudResult)
3.Model层
import android.util.Log
import com.gdc.kotlinproject.config.Flag
import com.gdc.kotlinproject.data_model.local.LocalRoomRequestManager
import com.gdc.kotlinproject.database.Student
import com.gdc.kotlinproject.modules.collect.interfaces.CollectModel
import com.gdc.kotlinproject.modules.collect.interfaces.CollectPresenter
/**
* @author XiongJie
* @version appVer
* @Package com.gdc.kotlinproject.modules.collect
* @file
* @Description:Model实现层
* @date 2021-6-4 20:08
* @since appVer
*/
class CollectModelImpl : CollectModel
override fun requestInsert(
listener: CollectPresenter.OnCollectListener,
vararg studests: Student
)
LocalRoomRequestManager.getInstance().insertStudents(*studests)
// TODO 伪代码：例如：这里还可以做很多的逻辑，等等，最终确保此操作没有问题，就返回true
// ......
listener.showIUD(true)
override fun requestUpdate(
listener: CollectPresenter.OnCollectListener,
vararg studests: Student
)
LocalRoomRequestManager.getInstance().updateStudents(*studests)
// TODO 伪代码：例如：这里还可以做很多的逻辑，等等，最终确保此操作没有问题，就返回true
// ......
listener.showIUD(true)
override fun requestDelete(
listener: CollectPresenter.OnCollectListener,
vararg studests: Student
)
LocalRoomRequestManager.getInstance().deleteStudents(*studests)
// TODO 伪代码：例如：这里还可以做很多的逻辑，等等，最终确保此操作没有问题，就返回true
// ......
listener.showIUD(true)
override fun requestDeleteAll(listener: CollectPresenter.OnCollectListener)
LocalRoomRequestManager.getInstance().deleteAllStudent()
// TODO 伪代码：例如：这里还可以做很多的逻辑，等等，最终确保此操作没有问题，就返回true
// ......
listener.showIUD(true)
override fun requestQueryAll(listener: CollectPresenter.OnCollectionResponseListener)
val result = LocalRoomRequestManager.getInstance().queryAllStudent()
Log.d(Flag.TAG, "requestQueryAll: result$result")
listener.showResultSuccess(result)
4.数据库操作管理
/**
* @author XiongJie
* @version appVer
* @Package com.gdc.kotlinproject.data_model.local
* @file
* @Description:
* 1.本地数据库相关操作管理
* （1）负责Dao对象的创建
* （2）负责Dao具体操作的执行
* （3）实现ILocalRequest与IDatabaseRequest接口，是为了实现业务方法的扩展
* @date 2021-6-4 20:28
* @since appVer
*/
class LocalRoomRequestManager : ILocalRequest,IDatabaseRequest
//1.DAO对象
var studentDao : StudentDao? = null
//1.Java构造代码块
init
//1.1获取数据库对象
val studentDatabase:StudentDatabase? = StudentDatabase.getDatabase()
studentDao = studentDatabase?.getStudentDao()
//1.本类单例
companion object
var INSTANCE : LocalRoomRequestManager? = null
fun getInstance() : LocalRoomRequestManager
if(null == INSTANCE)
synchronized(LocalRoomRequestManager::class)
if(null == INSTANCE)
INSTANCE = LocalRoomRequestManager()
//!!表示
return INSTANCE!!
override fun insertStudents(vararg students: Student)
studentDao?.insertStudents(*students)
override fun updateStudents(vararg students: Student)
studentDao?.updateStudents(*students)
override fun deleteStudents(vararg students: Student)
studentDao?.deleteStudents(*students)
override fun deleteAllStudent()
studentDao?.deleteAllStudent()
override fun queryAllStudent(): List<Student>?
return studentDao?.queryAllStudent()
4.1本地数据扩展接口
/**
* @author XiongJie
* @version appVer
* @Package com.gdc.kotlinproject.data_model.local
* @file
* @Description:
*
* 1.本地数据业务操作扩展
*
* （1）xml数据操作
*
* （2）其他本地数据
*
* 2.为了扩展，这样写（在仓库里面的）
*
* 3.本地获取标准接口（在仓库里面） 也就是本地的数据读取（包括本地xml数据，等）
*
* 4.只为 LocalRoomRequestManager 服务
*
* @date 2021-6-4 20:27
* @since appVer
*/
interface ILocalRequest
4.2数据库扩展接口
/**
* @author XiongJie
* @version appVer
* @Package com.gdc.kotlinproject.data_model.local
* @file
* @Description:
*
* 1.数据库获取标准接口
*
* （1）即数据库的数据读取
*
* （2）只为 LocalRoomRequestManager 服务
*
* 2.这样写是为了扩展
*
* @date 2021-6-4 20:26
* @since appVer
*/
interface IDatabaseRequest
fun insertStudents(vararg students: Student)
fun updateStudents(vararg students: Student)
fun deleteStudents(vararg students: Student)
fun deleteAllStudent()
fun queryAllStudent() : List<Student> ?
5.打赏鼓励
感谢您的细心阅读，您的鼓励是我写作的不竭动力！！！
5.1微信打赏
5.2支付宝打赏
5.1微信打赏
5.2支付宝打赏
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