我们一直用JAVA写代码，现在学了Kotlin，怎么用Kotlin怎么进行MVP抽取呢?
直接上代码!
各种base类
//BaseCallBack
abstract class BaseCallBack : ClassCallBack() {
abstract fun onSuccess(t: T)
abstract fun OnFail(error: String)
}
//BaseView
interface BaseView{}
//BasePresenter
interface BasePresenter{
fun onAttch(baseview: BaseView)
}
Contrct策略类
interface MyContract {
//P层接口
interface IMyPresenter : BasePresenter {
fun getData()
}
//M层接口
interface IMyModel {
fun getData(url: String, baseCallBack: BaseCallBack) {}
}
//V层接口
interface IMyView : BaseView {
fun onSuccess(t: T) {}
fun OnFail(error: String) {}
}
}
api类
interface MyService {
@GET
fun get(@Url url:String): Flowable
}
重要类-----帮助获取实际泛型参数
abstract class ClassCallBack {
val classReal: Class
get() = getSuperClassGenericType(javaClass) as Class
private fun getSuperClassGenericType(clz: Class<*>): Class<*> {
val type = clz.genericSuperclass as? ParameterizedType ?: return Any::class.java
val params = type.actualTypeArguments
return if (params[0] is ParameterizedType) {
(params[0] as ParameterizedType).rawType as Class<*>
} else
try {
params[0] as Class<*>
} catch (O_O: Exception) {
Any::class.java
}
}
}
Retrofit工具类以及INetwork
class RetrofitUtlis : INetWork {
var myService: MyService
//单例模式
//1私有静态变量
// 3静态方法获得本类对象
//1和3合体
companion object {
private var mRetrofitUtlis: RetrofitUtlis? = null;
//getInstance方法
fun getInstance(): RetrofitUtlis? {
if (mRetrofitUtlis == null) {
synchronized(RetrofitUtlis::class) {
//反射
if (mRetrofitUtlis == null) {
mRetrofitUtlis = RetrofitUtlis()
}
}
}
return mRetrofitUtlis
}
}
//2私有无参构造
private constructor() {
//创建okhttp
val okHttpClient = OkHttpClient()
.newBuilder()
.callTimeout(1000 * 10, TimeUnit.MILLISECONDS)
.build()
//创建retrofit
//创建对象
val retrofit = Retrofit.Builder()
.client(okHttpClient)
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.baseUrl("https://www.wanandroid.com/")
.build()
//创建接口对象
myService = retrofit.create(MyService::class.java)
//调用接口方法
}
override fun get(url: String, baseCallBack: BaseCallBack) {
val flowable = myService.get(url)
flowable.subscribeOn(Schedulers.io())
.onBackpressureBuffer()//设置被观察者的缓存策略--如果大于128个事件，则继续缓存
.observeOn(AndroidSchedulers.mainThread())
.subscribe(object : Subscriber {
override fun onComplete() {
}
override fun onSubscribe(s: Subscription?) {
s!!.request(100)
}
override fun onNext(t: ResponseBody?) {
//成功
val json = t?.string()
val gson = Gson()
val o = gson.fromJson(json, baseCallBack.classReal)
baseCallBack.onSuccess(o)
}
override fun onError(t: Throwable?) {
baseCallBack.OnFail(t.toString())
}
});
}
override fun get(url: String, map: Map, callBack: BaseCallBack) {}
override fun post(url: String, callBack: BaseCallBack) {}
override fun post(url: String, map: Map, callBack: BaseCallBack) {}
}
interface INetWork{
fun get(url: String, baseCallBack: BaseCallBack)
fun get(url: String, map: Map, callBack: BaseCallBack)
fun post(url: String, callBack: BaseCallBack)
fun post(url: String, map: Map, callBack: BaseCallBack)
}
M层实现类
class MyModel : MyContract.IMyModel {
override fun getData(url: String, baseCallBack: BaseCallBack) {
RetrofitUtlis.getInstance()?.get(url, baseCallBack)
}
}
P层实现类
class MyPresenter : MyContract.IMyPresenter {
var myModel: MyContract.IMyModel
lateinit var myView: MyContract.IMyView
constructor() {
myModel = MyModel()
}
override fun getData() {
myModel.getData("https://www.wanandroid.com/project/list/1/json?cid=294", object : BaseCallBack() {
override fun onSuccess(t: MyBean) {
myView.onSuccess(t)
}
override fun OnFail(error: String) {
myView.OnFail(error)
}
})
}
override fun onAttch(baseview: BaseView) {
myView = baseview as MyContract.IMyView;
}
}
那么kotlin写RecyclerView呢?
学习网址
主要是适配器方面
首先介绍一下单布局(以及对条目的监听)
class SAdapter(private val context: Context, private val list: ArrayList?) :
RecyclerView.Adapter() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SAdapter.SimpleViewHolder {
var view = LayoutInflater.from(context).inflate(R.layout.item_view, null)
return SimpleViewHolder(view)
}
override fun getItemCount(): Int {
return list!!.size;
}
override fun onBindViewHolder(holder: SAdapter.SimpleViewHolder, position: Int) {
holder.tv_re.setText(list!!.get(position).desc)
//对条目进行监听
holder.tv_re.setOnClickListener {
Toast.makeText(context, holder.tv_re.text, Toast.LENGTH_SHORT).show();
}
}
inner class SimpleViewHolder(view: View) : RecyclerView.ViewHolder(view) {
var tv_re: TextView = view.findViewById(R.id.tv_re_item)
}
}
接下来介绍一下多布局吧(包括条目点击和接口回调)
class SAdapter(private val context: Context, private val list: ArrayList?) :
RecyclerView.Adapter() {
var myInterface: MyInterface? = null
fun setListener(myInterface: MyInterface?) {
this.myInterface = myInterface
}
private val VIEW_0 = 0
private val VIEW_1 = 1
private val VIEW_2 = 2
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
var view: View
if (viewType == 0) {
view = LayoutInflater.from(context).inflate(com.whx.kotlino.R.layout.item_view, null)
return ViewHolder0(view)
} else if (viewType == 1) {
view = LayoutInflater.from(context).inflate(com.whx.kotlino.R.layout.item_view1, null)
return ViewHolder1(view)
} else {
view = LayoutInflater.from(context).inflate(com.whx.kotlino.R.layout.item_view2, null)
return ViewHolder2(view)
}
}
override fun getItemCount(): Int {
return list!!.size;
}
override fun getItemViewType(position: Int): Int {
if (position == VIEW_0) {
return 0
} else if (position == VIEW_1) {
return 1
} else {
return 2
}
}
override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
val type = getItemViewType(position)
if (type == 0) {
if (holder is ViewHolder0) {
holder.tv_re.setText(list!!.get(position).desc)
holder.tv_re.setOnClickListener {
if (myInterface != null) {
myInterface!!.test(position)
}
}
}
} else if (type == 1) {
if (holder is ViewHolder1) {
Glide.with(context).load("https://wanandroid.com/blogimgs/2baa4b4b-acfe-473c-b534-9d672423e564.png")
.into(holder.iv_view1)
}
} else {
if (holder is ViewHolder2) {
//设置图片加载器
holder.banner_item2.setImageLoader(GlideImage())
//加载网络图片
val mImages = ArrayList()
mImages.add("https://wanandroid.com/blogimgs/2baa4b4b-acfe-473c-b534-9d672423e564.png")
mImages.add("https://wanandroid.com/blogimgs/2baa4b4b-acfe-473c-b534-9d672423e564.png")
mImages.add("https://wanandroid.com/blogimgs/2baa4b4b-acfe-473c-b534-9d672423e564.png")
//设置图片集合
holder.banner_item2.setImages(mImages)
//banner设置方法全部调用完毕时最后调用
holder.banner_item2.start()
}
}
}
inner class GlideImage : ImageLoader() {
override fun displayImage(context: Context, path: Any, imageView: ImageView) {
Glide.with(context).load(path).into(imageView)
}
}
class ViewHolder0(view: View?) : RecyclerView.ViewHolder(view!!) {
var tv_re: TextView = view!!.findViewById(com.whx.kotlino.R.id.tv_re_item)
}
class ViewHolder1(view: View?) : RecyclerView.ViewHolder(view!!) {
var iv_view1: ImageView = view!!.findViewById(com.whx.kotlino.R.id.iv_view1)
}
class ViewHolder2(view: View?) : RecyclerView.ViewHolder(view!!) {
var banner_item2: Banner = view!!.findViewById(com.whx.kotlino.R.id.banner_item2)
}
interface MyInterface {
fun test(position: Int)
}
}
接下来我们来谈一谈数据库吧！
参考网址
首先先配置
//GreenDao
//项目app依赖
implementation 'org.greenrobot:greendao:3.2.2' // add library
-------------------------
//工程依赖
mavenCentral() // 添加的代码
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin
-------------------------
//项目依赖
apply plugin: 'org.greenrobot.greendao' // apply plugin
-------------------------
greendao{
schemaVersion 1 //数据库版本号
daoPackage 'com.example.exercise2.dao' //数据库全路径
targetGenDir 'src/main/java' //存放位置
}
然后创建一个bean类（用java类创建）
@Entity
public class MyDaoBean {
//自增的ID
@Id(autoincrement = true)
long e_id;
String name;
}
锤后自动生成三个类 路径是根据你上边 greendao 给的
接下来我们写工具类
class My private constructor(context: Context) {
var myDaoDao: MyDaoBeanDao
init {
//第一种方法
val devOpenHelper = DaoMaster.DevOpenHelper(context, "my", null)
val writableDb = devOpenHelper.writableDb
val daoMaster = DaoMaster(writableDb)
val newSession = daoMaster.newSession()
this.myDaoDao = newSession.myDaoBeanDao
//第二种方法
// val newDevSession = DaoMaster.newDevSession(context, "my")
// val myDaoDao1 = newDevSession.myDaoDao
}
//伴生 —— 单例
companion object {
private var my: My? = null
fun getmy(context: Context): My? {
if (my == null) {
@Synchronized
if (my == null) {
my = My(context)
}
}
return my
}
}
//添加数据
fun getinsert(myDao: MyDaoBean) {
myDaoDao.insert(myDao)
}
//删除数据
fun getdelet(myDao: MyDaoBean) {
myDaoDao.delete(myDao)
}
//修改数据
fun getupdata(myDao: MyDaoBean) {
myDaoDao.update(myDao)
}
//查询数据(指定数据)
fun getquest_count(name: String): List {
val where = myDaoDao.queryBuilder().where(MyDaoBeanDao.Properties.Name.eq(name)).list()
return where
}
//查询数据(所有数据)
fun getquest_true(name: String): List {
val list = myDaoDao.queryBuilder().list()
return list
}
//查询数据(模糊数据)
fun getquest_like(name: String): List {
val where = myDaoDao.queryBuilder().where(MyDaoBeanDao.Properties.Name.like("%$name%")).list()
return where
}
}
调用--添加数据
My.getmy(this)?.getinsert(myDaoBean)