一.MVVM

1.依赖

config.gradle

  //jetpack
    def lifecycle_version = "2.5.1"
    libLivedata = "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
    libViewmodel = "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
    libFragmentKtx = "androidx.fragment:fragment-ktx:1.5.5"
    //room
    def room_version = "2.4.0"
    libRoom = "androidx.room:room-runtime:$room_version"
    libRoomCompiler = "androidx.room:room-compiler:$room_version"//room kotlin注解
    libRoomKtx ="androidx.room:room-ktx:$room_version"
    libRoomRxjava = "androidx.room:room-rxjava2:$room_version"
    libRoomPaging = "androidx.room:room-paging:$room_version"

    //hilt依赖注入
    libHilt = 'com.google.dagger:hilt-android:2.46'
    libHiltCompiler = 'com.google.dagger:hilt-android-compiler:2.46'

base:build.gradle

    //jetpack
    api libLivedata
    api libViewmodel
    api libFragmentKtx
    //room
//    api libRoom
//    kapt  libRoomCompiler //注解
//    api libRoomKtx
//    api libRoomRxjava
//    api libRoomPaging
    //hilt依赖注入
//    api libHilt
//    kapt libHiltCompiler

注意：所有的build.gradle配置,

 dataBinding{
        enabled = true
    }

2.mvvm封装

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open class BaseRepository {
    /**
     * 创建对应的service api接口
     */
     fun <T> createApiService(service:Class<T>):T{
         return RetrofitManager.getRetrofit().create(service)
     }
}

open class BaseViewModel:ViewModel() {
    //所有ViewModel公共方法
}

/**
 * 1。沉浸式状态栏
 * 2。DataBinding findViewById
 * 3。initData():数据
 * 4.initListener()：点击事件
 * 5。EventBus事件总线封装
 * 6.数据加载中，数据加载失败，数据加载成功，无网络等
 *
 */
abstract class BaseActivity<VDB:ViewDataBinding>:AppCompatActivity() {
    protected lateinit var viewDataBinding:VDB

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        viewDataBinding = DataBindingUtil.setContentView(this,getLayout())//initView
        initListener()
        initData()
    }
    abstract fun getLayout():Int //返回布局id
    abstract fun initData() //初始化数据
    abstract fun initListener()//事件监听
}

abstract class BaseMVVMActivity<VM:BaseViewModel,VDB:ViewDataBinding>:BaseActivity<VDB>() {
    protected val viewModel:VM by lazy { ViewModelProvider(this).get(getJVMClass()) }
    //子类重写 返回具体的viewmodel对应class文件
    abstract fun getJVMClass():Class<VM>
}

3.业务层调用

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1.MainService

interface MainService {
    @GET("/banner/json")
    fun banner():LiveData<ApiResponse<MutableList<BannerEntity>>>

}

2.MainRepository

class MainRepository:BaseRepository() {
    //使用MainService请求轮播图数据
    fun banner():LiveData<ApiResponse<MutableList<BannerEntity>>>{
        return createApiService(MainService::class.java).banner()
    }
}

3.MainViewModel

class MainViewModel:BaseViewModel() {
    private var mainResponse = MainRepository()//仓库
    fun banner(): LiveData<ApiResponse<MutableList<BannerEntity>>> {
        return mainResponse.banner()
    }
}

4.TestActivity

class TestActivity : BaseMVVMActivity<MainViewModel,MainActivityTestBinding>() {
    override fun getLayout(): Int {
        return R.layout.main_activity_test
    }
    override fun initData() {
        viewModel.banner()
            .observe(this){
                viewDataBinding.tv.text = it.data.toString()
            }

    }
    override fun initListener() {
        viewDataBinding.tv.setOnClickListener {
            ToastUtils.showShort("hahah")
        }

    }
    override fun getJVMClass(): Class<MainViewModel> {
        return MainViewModel::class.java
    }

}