胖蔡说技术Mvvm的封装我采用的是kotlin + ARouter + Retrofit + MvvM方式进行封装，实现一个app的基本开发需求，包括:分包、快速开发、网络请求、框架集合等。如下，介绍一些封装的基础组件，详细代码模本可参考我的开源工程。
界面实现
- 界面实现是通过反射创建基类BaseMvvmActivity、BaseMvvmFragment，如下：
abstract class BaseMvvmFragment<in T: ViewDataBinding, V: ViewModel>() : BaseFragment(){
/**
* 泛型占位符
*/
private val tClass:Class<T>
private val vClass:Class<V>
constructor(layoutId:Int):this()
init {
val type = javaClass.genericSuperclass
val types = (type as ParameterizedType).actualTypeArguments
tClass = types[0] as Class<T>
vClass = types[1] as Class<V>
}
/**
* 数据绑定生成类
*/
private lateinit var viewBinding:T
/**
* 数据操作ViewModel
*/
protected lateinit var viewModel: V
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
activity?.let {
if (it is AppCompatActivity){
viewModel = it.obtainViewModel(vClass).also { viewModel ->
observe(viewModel)
}
}
}
val method = tClass.getMethod("inflate", LayoutInflater::class.java,ViewGroup::class.java,
Boolean::class.java)
method.isAccessible =true
viewBinding= (method.invoke(null,layoutInflater,container,false) as T).apply {
val objClass = javaClass
try{
val mt = objClass.methods.last {
it.name.startsWith("set") && it.parameterTypes.size==1 && it.parameterTypes[0] == vClass
}
mt?.isAccessible = true
mt.invoke(this,viewModel)
}catch (e: Exception){
e.printStackTrace()
LogUtils.e("获取viewModel异常:${e.message}")
}
lifecycleOwner = viewLifecycleOwner
}
val view = viewBinding.root
init(view)
return view
}
/**
*
* 数据监听回调
* @param v 绑定的viewModel
*/
abstract fun observe(v:V)
/**
* 重写初始化UI或者data,非必要
*/
open fun init(view:View)=Unit
}
- recyclerview adapter基类
abstract class BaseAdapter<T,V: ViewDataBinding>(@LayoutRes val layoutResId:Int,list:List<T>?=null):
BaseQuickAdapter<T, BaseHolder<V>>(layoutResId,list) {
override fun convert(helper: BaseHolder<V>?, item: T) {
observe(helper?.binding,helper,item)
}
abstract fun observe(v:V?, helper: BaseHolder<V>?, item: T)
}
class BaseHolder<V: ViewDataBinding>(val view: View): BaseViewHolder(view){
var binding:V = DataBindingUtil.bind<V>(view)!!.apply{
executePendingBindings()
}
}
- viewModle 实现基类
abstract class BaseViewModel<T> : ViewModel() {
/**
* 网络请求泛型占位符
*/
private val tClass:Class<T>?
val resp: RepositoryImpl = ViewModelFactory.getInstance().repository
init {
val type = javaClass.genericSuperclass
val types = (type as ParameterizedType).actualTypeArguments
tClass = types[0] as Class<T>
}
/**
* 网络请求api
*/
val api:T? by lazy {
tClass?.let {
RetrofitFactory.instance.create(tClass)
}
}
companion object {
@BindingAdapter("app:imageUrl")
@JvmStatic
fun loadImage(imageView: ImageView, url: String) {
Glide.with(imageView.context).load(url).into(imageView)
}
}
}
- 网络请求使用 网络请求可直接创建retrofit 的api接口类，直接在viewModel调用请求
interface TestApi {
@GET("/test")
fun getTest():CallAdapterLiveData<BaseResp<TestData>>
}
//ViewModel
class TestViewModel : BaseViewModel<TestApi>(){
fun initData(){
lifecycleObserver?.apply {
api?.getTest()?.observe(this, Observer {
it.success {
//成功返回数据
}.error {
//返回数据异常
}
})
}
}
}
