android-mvp
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使用kotlin实现简单的Android MVP模式Demo
android-mvp
使用kotlin实现简单的Android MVP模式Demo
另外一个项目 android-mvp-kotlin使用了Dagger2、Retrofit、RxJava等来实现MVP
![](https://github.com/mazouri/android-mvp/raw/master/screenshot/android-mvp.gif)
谷歌宣布,将Kotlin语言作为安卓开发的一级编程语言 Google I/O 大会全程视频直播
为什么要学习Kotlin?因为它能使Android的开发更简洁、高效及安全,更因为谷歌的推崇!
不说废话,直入主题。很久之前在看mvp模式的时候,看多很多小例子,这里用kotlin来简单实现一下,完全是入门级的,对于刚刚了解kotlin来开发Android的同学,是个不错的例子。
完整案例和使用Dagger2、Retrofit、RxJava、Kotlin实现MVP的源码欢迎Github查看:
Kotlin结合Dagger2等开源项目实现MVP之android-mvp-kotlin源码
案例主要功能是:用户输入用户id、姓名、年龄等信息进行保存,然后通过用户id读取保存的信息。案例很简单,但是涵盖了mvp的各个要素。
MVP: Presenter与Model、View都是通过接口来进行交互的,从而来降低耦合
1.首先,创建一个数据类: (关于kotlin知识点:1.怎么创建数据类,2.类构造方法)
/**
* 创建一个数据类
*
* Kotlin知识点(data class):http://kotlinlang.org/docs/reference/data-classes.html#data-classes
*
* Created by wangdongdong on 17-5-23.
*/
data class User(val userName: String, val age: Int)
2.创建View接口: (关于kotlin知识点:1.怎么创建一个接口,2.接口方法写法,3.返回值类型,4.方法的参数)
interface IUserView {
fun getID(): Int
fun getUsername(): String
fun getAge(): Int
fun setUsername(username: String)
fun setAge(age: Int)
fun onSaveSuccess()
}
3.创建Model接口
interface IUserModel {
fun setId(id: Int)
fun setUsername(username: String)
fun setAge(age: Int)
fun save()
fun load(id: Int): User
}
4.创建Model实现类: (关于kotlin知识点:1.实现接口的类,2.方法覆写)
class UserModel: IUserModel {
private var mId: Int = 0
private var mUsername: String = ""
private var mAge: Int = 0
private val mUserArray = SparseArray<User>()
override fun setId(id: Int) {
mId = id
}
override fun setUsername(username: String) {
mUsername = username
}
override fun setAge(age: Int) {
mAge = age
}
override fun save() {
mUserArray.append(mId, User(mUsername, mAge))
}
override fun load(id: Int): User {
mId = id
return mUserArray.get(mId, User("not found", 0))
}
}
5.创建Presenter接口:
interface IUserPresenter {
fun saveUser(id: Int, username: String, age: Int)
fun loadUser(id: Int)
}
6.创建Presenter实现类:
class UserPresenter(val view: IUserView): IUserPresenter {
private val mUserModel: UserModel = UserModel()
override fun saveUser(id: Int, username: String, age: Int) {
Log.d("test_log", "saveUser : $id,$username,$age")
mUserModel.setId(id)
mUserModel.setUsername(username)
mUserModel.setAge(age)
mUserModel.save()
view.onSaveSuccess()
}
override fun loadUser(id: Int) {
Log.d("test_log", "loadUser : $id")
val user = mUserModel.load(id)
view.setUsername(user.userName)
view.setAge(user.age)
}
}
7.创建Activity:
class MainActivity : AppCompatActivity(), IUserView, View.OnClickListener {
private var mUserPresenter: UserPresenter? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
mUserPresenter = UserPresenter(this)
saveButton.setOnClickListener(this)
loadButton.setOnClickListener(this)
}
override fun onClick(v: View) {
when(v.id) {
R.id.saveButton -> mUserPresenter?.saveUser(getID(), getUsername(), getAge())
R.id.loadButton -> mUserPresenter?.loadUser(getID())
}
}
override fun onSaveSuccess() {
edt_id.setText("")
edt_username.setText("")
edt_age.setText("")
Toast.makeText(this, "保存成功", Toast.LENGTH_SHORT).show()
}
override fun getID(): Int {
val id = edt_id.text.toString().trim()
if (id.isNotEmpty())
return id.toInt()
else
return 0
}
override fun getUsername(): String = edt_username.text.toString()
override fun getAge(): Int {
val age = edt_age.text.toString().trim()
if (age.isNotEmpty())
return age.toInt()
else
return 0
}
override fun setUsername(username: String) {
Log.d("test_log", "setUsername:$username")
edt_username.text = toEditable(username)
}
override fun setAge(age: Int) {
Log.d("test_log", "setUsername:$age")
edt_age.text = toEditable(age.toString())
}
}
结构很简洁,代码也很简单,相信看完代码后,大家对kotlin的基本使用和mvp模式都能有所了解了!