KaptGenerateViewModel

Kapt编译时生成Viewmodel

Android架构组件拥有生命周期的自动管理和数据解耦等优秀的功能，能够将传统MVP架构进行替换。在使用架构组件的过程中，我采用的方式是首先完成基础类

T 表示对应的retrofit service类型

abstract class BaseViewModel<T>(application: Application) : AndroidViewModel(application) {

之后针对Retrofit中的不同Service interface，继承并实现具体的viewmodel类，并针对每个service接口，需要编写一个liveData字段和对应的get或post方法提供给app层调用，同时对应的方法可能会存在三种类型:

1:直接调用service进行网络获取

package com.xxx.xxx.architecture.xxx

import android.app.Application
import android.arch.lifecycle.MediatorLiveData
import com.baseproject.architecture.BaseViewModel
import com.xxx.xxx.appbase.BaseAppLiveDataObserver

/**
 * This file is generated by kapt, please do not edit this file */
open class BaseAnchorServiceViewModel(application: Application) : BaseViewModel<AnchorService>(application) {
    val getHotAnchorListLiveData: MediatorLiveData<kotlin.collections.List<SearchHotAnchorModel>> by lazy { MediatorLiveData<kotlin.collections.List<SearchHotAnchorModel>>() }

    fun getHotAnchorList() {
        mService.getHotAnchorList().subscribe(BaseAppLiveDataObserver(getHotAnchorListLiveData))
    }
}

2：使用本地缓存展示之后进行网络获取更新

    val getUserAssetsLiveData: MediatorLiveData<UserAssetsModel> by lazy { MediatorLiveData<UserAssetsModel>() }

    fun getUserAssets() {
        object : BaseAppNetworkBoundResource<UserAssetsModel>(getUserAssetsLiveData) {
        override fun doApiCall(): Observable<UserAssetsModel> {
        return mService.getUserAssets()}}
    }

3:使用json类型的数据post，也会造成所需方法写法上的差异

    val postRewardReceiveLiveData: MediatorLiveData<PostRewardReceiveModel> by lazy { MediatorLiveData<PostRewardReceiveModel>() }

    fun postRewardReceive(reward_ids: List<Int>, anchor_id: String) {
        val params = BaseJSONObject().put("reward_ids",reward_ids).put("anchor_id",anchor_id)
        mService.postRewardReceive(RequestBody.create(MediaType.parse("application/json"), params.toString())).subscribe(BaseAppLiveDataObserver(postRewardReceiveLiveData))
    }

不同的方式有很多共同之处，因此我采用kapt注解的方式一键生成相关代码，大大优化了开发效率，项目地址:

https://github.com/huanle19891345/kapt_viewmodel

欢迎指教