Koltin24.Takeout使用dagger2解耦(10)

使用方法：

build.gradle(project)下定义版本号

buildscript { ext.kotlin_version = '1.4.10' ext.dagger_version = "2.28.3"//dragger2 版本号 repositories { google() jcenter() }

接下来在build.gradle(app)下添加

apply plugin: 'kotlin-kapt'

添加依赖:

//dagger框架 //dagger2 support begin implementation "com.google.dagger:dagger-android:$dagger_version" implementation "com.google.dagger:dagger-android-support:$dagger_version" // if you use the support libraries //annotationProcessor "com.google.dagger:dagger-android-processor:$dagger_version"//java use //annotationProcessor "com.google.dagger:dagger-compiler:$dagger_version"//java use kapt "com.google.dagger:dagger-android-processor:$dagger_version"//kotlin use kapt "com.google.dagger:dagger-compiler:$dagger_version"//kotlin use //dagger2 support end

HomeFragmentComponent.kt

package com.example.takeout.dagger2.component import com.example.takeout.ui.fragment.HomeFragment import com.example.takeout.dagger2.module.HomeFragmentModule import dagger.Component @Component(modules = arrayOf(HomeFragmentModule::class)) interface HomeFragmentComponent { fun inject(homeFragment: HomeFragment) }

HomeFragmentModule.kt

package com.example.takeout.dagger2.module import com.example.takeout.presenter.HomeFragmentPresenter import com.example.takeout.ui.fragment.HomeFragment import dagger.Module import dagger.Provides @Module class HomeFragmentModule(val homeFragment: HomeFragment){ @Provides fun provideHomeFragmentPresenter(): HomeFragmentPresenter { return HomeFragmentPresenter(homeFragment) } }

HomeFragment.kt中使用注解，不再使用homeFragmentPresenster = HomeFragmentPresenster(this)这种耦合的形式

package com.example.takeout.ui.fragment import android.app.Fragment import android.graphics.Color import android.os.Bundle import android.util.Log import android.util.TypedValue import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import androidx.recyclerview.widget.LinearLayoutManager import androidx.recyclerview.widget.RecyclerView import com.example.takeout.R import com.example.takeout.dagger2.component.DaggerHomeFragmentComponent import com.example.takeout.dagger2.module.HomeFragmentModule import com.example.takeout.presenter.HomeFragmentPresenter import com.example.takeout.ui.adapter.HomeRvAdapter import com.heima.takeout.model.beans.Seller import kotlinx.android.synthetic.main.fragment_home.* import org.jetbrains.anko.find import org.jetbrains.anko.toast import javax.inject.Inject class HomeFragment : Fragment() { lateinit var homeRvAdapter: HomeRvAdapter//延迟初始化 lateinit var rvHome: RecyclerView //dragger2注解使用prenster @Inject lateinit var homeFragmentPresenter:HomeFragmentPresenter override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { val view = View.inflate(activity, R.layout.fragment_home, null) rvHome = view.find<RecyclerView>(R.id.rv_home) //上下布局 rvHome.layoutManager = LinearLayoutManager(activity) homeRvAdapter = HomeRvAdapter(activity) rvHome.adapter = homeRvAdapter // homeFragmentPresenster = HomeFragmentPresenster(this) //TODO:解耦View层和P层，通过dagger2（基于注解的依赖注入）生成HomeFragmentPresenter DaggerHomeFragmentComponent.builder().homeFragmentModule(HomeFragmentModule(this)).build().inject(this) distance = 120.dp2px() return view } fun Int.dp2px(): Int { return TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, toFloat(), resources.displayMetrics ).toInt() } override fun onActivityCreated(savedInstanceState: Bundle?) { super.onActivityCreated(savedInstanceState) initData() } val datas: ArrayList<Seller> = ArrayList<Seller>() var sum: Int = 0 var distance: Int = 0 var alpha = 55 private fun initData() { // for (i in 0 until 100) { // datas.add("我是商家：" + i) // } homeFragmentPresenter.getHomeInfo() // homeRvAdapter.setData(datas) } // 所有的数据 val allList: ArrayList<Seller> = ArrayList() fun onHomeSuccess(nearbySellers: List<Seller>, otherSellers: List<Seller>) { allList.clear() allList.addAll(nearbySellers) allList.addAll(otherSellers) homeRvAdapter.setData(allList) //有数据可以滚动才可以监听滚动事件,设置标题的透明效果 rvHome.setOnScrollListener(object : RecyclerView.OnScrollListener() { override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) { if (recyclerView != null) { super.onScrollStateChanged(recyclerView, newState) } } override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) { if (recyclerView != null) { super.onScrolled(recyclerView, dx, dy) } sum += dy if (sum > distance) { alpha = 255 } else { alpha = sum * 200 / distance alpha += 55 } Log.e("home", "alpha:$alpha") ll_title_container.setBackgroundColor(Color.argb(alpha, 0x31, 0x90, 0xe8)) } }) } fun onHomeFailed() { toast("onHomeFailed") } }