Android 我点击项目进入回收器视图，它改变了两个项目视图的背景色

我是kotlin的android新手。我有一个线性布局的回收视图。当我在itemView上单击时，我会更改背景以选择它。但该应用程序更改了两个项目视图的背景。我不知道发生了什么。这是我的代码：

月经活动

class MenuActivity : AppCompatActivity() {

    private val section =  SectionParameters.builder().itemResourceId(R.layout.list_item_grid_menu)
        .headerResourceId(R.layout.header_layout)
        .build()

    private val categoryService= CategoriaServiceDbImpl()
    private val manageSharedPrefrences = ManageSharedPrefrences()
    private var namedbanko = ""
    private var defaultSection = 1
    private var indexDefaultSection = 0
    private var categories = emptyList<Categoria>()
    var categoryListAdapter: CategoryListGridRecycleAdapter? = null
    var summaryRecycleAdapter: SumaryRecyclerAdapter? = null

    var viewSection:View? = null
    var posIni:Int = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_menu)

        namedbanko = manageSharedPrefrences.getValueSharedPreference(SessionEnum.CONNECTION.KEY,SessionEnum.SESSION.KEY,this)
        /**
         * Secciones
         */
        sections(defaultSection,indexDefaultSection)
        /**
         * Lista de productos
         */
        val categoryDefault = this.categories.get(this.indexDefaultSection);
        val sectionAdapter = SectionedRecyclerViewAdapter()
        val productosService = ProductoServiceDbImpl()
        productosService.namedb = namedbanko

        val listProducts = productosService.getProductoByTipo(defaultSection)
        title_section_selected.text = categoryDefault.nombre
        sectionAdapter.addSection(ComponentStatelessMenu(this,"",listProducts,section ))
        val recycleView: RecyclerView = recyclerlist_menu

        val glm = GridLayoutManager(this,2)

        glm.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
            override fun getSpanSize(position: Int): Int {
                when (sectionAdapter.getSectionItemViewType(position)) {
                    SectionedRecyclerViewAdapter.VIEW_TYPE_HEADER -> return 2
                    else -> return 1
                }
            }
        }

        //recycleView.layoutManager = LinearLayoutManager (this)
        recycleView.layoutManager = glm
        recycleView.setNestedScrollingEnabled(true)
        recycleView.adapter = sectionAdapter

        val recyclerViewSummary : RecyclerView = recycler_summary
        val layoutManager = LinearLayoutManager(this)
        recyclerViewSummary.layoutManager =layoutManager
        this.summaryRecycleAdapter = SumaryRecyclerAdapter(this)
        recyclerViewSummary.adapter = this.summaryRecycleAdapter


    }

    fun sections(selectedSection:Number,position:Int){

        this.categoryListAdapter = CategoryListGridRecycleAdapter(this,selectedSection)

        val layoutSections = LinearLayoutManager(this)
        layoutSections.orientation = LinearLayoutManager.HORIZONTAL
        recycler_sections_menu.layoutManager = layoutSections
        recycler_sections_menu.overScrollMode = View.OVER_SCROLL_IF_CONTENT_SCROLLS

        if(this.categories.isEmpty()){
            this.categories = getSections()
        }else{
            var i = 0
            while(i<this.categories.size){
                this.categories.get(i).selected = StateEnum.N.VALUE
                i++
            }
        }

        categoryListAdapter?.setCategoryList(this.categories)
        recycler_sections_menu.adapter = categoryListAdapter

        if(position > 0){
            recycler_sections_menu.scrollToPosition(position.toInt()-1)
        }

        /*val namedb = connectionService.getNameDb(this.applicationContext)
        categoryService.namedb = namedb
        val listCategory = categoryService.listProductByCategory(0)

        val section_category =  SectionParameters.builder().itemResourceId(R.layout.list_item_section)
            .headerResourceId(R.layout.header_layout)
            .build()
        val sectionAdapterCategory : SectionedRecyclerViewAdapter = SectionedRecyclerViewAdapter()
        sectionAdapterCategory.addSection(CategoriasStatelessSection(getString(R.string.title_sections),listCategory,section_category))

        val recycleView: RecyclerView = recycler_sections_menu
        val lm = LinearLayoutManager(this)
        lm.orientation = LinearLayoutManager.HORIZONTAL

        recycleView.layoutManager = lm
        recycleView.setNestedScrollingEnabled(true)
        recycleView.adapter = sectionAdapterCategory*/

    }

    fun refreshProductsSection(category: Categoria){

        val sectionAdapter : SectionedRecyclerViewAdapter = SectionedRecyclerViewAdapter()

        val productosService = ProductoServiceDbImpl()
        productosService.namedb = namedbanko

        val listProducts = productosService.getProductoByTipo(category.codigo)

        sectionAdapter.addSection(ComponentStatelessMenu(this,"",listProducts,section ))
        val recycleView: RecyclerView = recyclerlist_menu

        val glm = GridLayoutManager(this,2)

        glm.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
            override fun getSpanSize(position: Int): Int {
                when (sectionAdapter.getSectionItemViewType(position)) {
                    SectionedRecyclerViewAdapter.VIEW_TYPE_HEADER -> return 2
                    else -> return 1
                }
            }
        }

        //recycleView.layoutManager = LinearLayoutManager (this)
        recycleView.layoutManager = glm
        recycleView.setNestedScrollingEnabled(true)
        recycleView.adapter = sectionAdapter
    }

    fun changeColorSelectedSection(view: View,position: Int){

        if(this.viewSection!=null){
            this.viewSection!!.setBackgroundResource(0)
        }
        view.setBackgroundColor(getColor(R.color.colorSectionSelected))
        categoryListAdapter!!.notifyDataSetChanged()

        this.viewSection = view
    }

    fun getSections():List<Categoria>{
        categoryService.namedb = namedbanko
        return categoryService.listCategorias()
    }
}

var selectedPosition: Int = -1

...

fun changeColorSelectedSection(position: Int) {
    selectedPosition = position
    categoryListAdapter?.notifyDataSetChanged()
}

您使用的是RecyclerView，它可以回收视图。因此，当您更改特定视图的背景，并且在列表中向下滚动时再次使用该视图时，背景将与当前为该项目设置的背景相同。例如，如果我在屏幕上看到5个项目，并单击项目1使其处于选中状态，则项目1的视图现在处于选中状态。但当我向下滚动到项目6，项目1离开屏幕时，项目1的视图将被重新用于项目6，并且仍处于其状态

为了解决这个问题，您不应该跟踪选定的视图，而应该跟踪选定的项目，然后根据它所代表的项目更新视图。在RecyclerView中，一个视图不是用于一个项目，而是用于多个项目

下面是一个代码更改最少的解决方案：

月经活动

class MenuActivity : AppCompatActivity() {

    private val section =  SectionParameters.builder().itemResourceId(R.layout.list_item_grid_menu)
        .headerResourceId(R.layout.header_layout)
        .build()

    private val categoryService= CategoriaServiceDbImpl()
    private val manageSharedPrefrences = ManageSharedPrefrences()
    private var namedbanko = ""
    private var defaultSection = 1
    private var indexDefaultSection = 0
    private var categories = emptyList<Categoria>()
    var categoryListAdapter: CategoryListGridRecycleAdapter? = null
    var summaryRecycleAdapter: SumaryRecyclerAdapter? = null

    var viewSection:View? = null
    var posIni:Int = 0

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_menu)

        namedbanko = manageSharedPrefrences.getValueSharedPreference(SessionEnum.CONNECTION.KEY,SessionEnum.SESSION.KEY,this)
        /**
         * Secciones
         */
        sections(defaultSection,indexDefaultSection)
        /**
         * Lista de productos
         */
        val categoryDefault = this.categories.get(this.indexDefaultSection);
        val sectionAdapter = SectionedRecyclerViewAdapter()
        val productosService = ProductoServiceDbImpl()
        productosService.namedb = namedbanko

        val listProducts = productosService.getProductoByTipo(defaultSection)
        title_section_selected.text = categoryDefault.nombre
        sectionAdapter.addSection(ComponentStatelessMenu(this,"",listProducts,section ))
        val recycleView: RecyclerView = recyclerlist_menu

        val glm = GridLayoutManager(this,2)

        glm.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
            override fun getSpanSize(position: Int): Int {
                when (sectionAdapter.getSectionItemViewType(position)) {
                    SectionedRecyclerViewAdapter.VIEW_TYPE_HEADER -> return 2
                    else -> return 1
                }
            }
        }

        //recycleView.layoutManager = LinearLayoutManager (this)
        recycleView.layoutManager = glm
        recycleView.setNestedScrollingEnabled(true)
        recycleView.adapter = sectionAdapter

        val recyclerViewSummary : RecyclerView = recycler_summary
        val layoutManager = LinearLayoutManager(this)
        recyclerViewSummary.layoutManager =layoutManager
        this.summaryRecycleAdapter = SumaryRecyclerAdapter(this)
        recyclerViewSummary.adapter = this.summaryRecycleAdapter


    }

    fun sections(selectedSection:Number,position:Int){

        this.categoryListAdapter = CategoryListGridRecycleAdapter(this,selectedSection)

        val layoutSections = LinearLayoutManager(this)
        layoutSections.orientation = LinearLayoutManager.HORIZONTAL
        recycler_sections_menu.layoutManager = layoutSections
        recycler_sections_menu.overScrollMode = View.OVER_SCROLL_IF_CONTENT_SCROLLS

        if(this.categories.isEmpty()){
            this.categories = getSections()
        }else{
            var i = 0
            while(i<this.categories.size){
                this.categories.get(i).selected = StateEnum.N.VALUE
                i++
            }
        }

        categoryListAdapter?.setCategoryList(this.categories)
        recycler_sections_menu.adapter = categoryListAdapter

        if(position > 0){
            recycler_sections_menu.scrollToPosition(position.toInt()-1)
        }

        /*val namedb = connectionService.getNameDb(this.applicationContext)
        categoryService.namedb = namedb
        val listCategory = categoryService.listProductByCategory(0)

        val section_category =  SectionParameters.builder().itemResourceId(R.layout.list_item_section)
            .headerResourceId(R.layout.header_layout)
            .build()
        val sectionAdapterCategory : SectionedRecyclerViewAdapter = SectionedRecyclerViewAdapter()
        sectionAdapterCategory.addSection(CategoriasStatelessSection(getString(R.string.title_sections),listCategory,section_category))

        val recycleView: RecyclerView = recycler_sections_menu
        val lm = LinearLayoutManager(this)
        lm.orientation = LinearLayoutManager.HORIZONTAL

        recycleView.layoutManager = lm
        recycleView.setNestedScrollingEnabled(true)
        recycleView.adapter = sectionAdapterCategory*/

    }

    fun refreshProductsSection(category: Categoria){

        val sectionAdapter : SectionedRecyclerViewAdapter = SectionedRecyclerViewAdapter()

        val productosService = ProductoServiceDbImpl()
        productosService.namedb = namedbanko

        val listProducts = productosService.getProductoByTipo(category.codigo)

        sectionAdapter.addSection(ComponentStatelessMenu(this,"",listProducts,section ))
        val recycleView: RecyclerView = recyclerlist_menu

        val glm = GridLayoutManager(this,2)

        glm.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
            override fun getSpanSize(position: Int): Int {
                when (sectionAdapter.getSectionItemViewType(position)) {
                    SectionedRecyclerViewAdapter.VIEW_TYPE_HEADER -> return 2
                    else -> return 1
                }
            }
        }

        //recycleView.layoutManager = LinearLayoutManager (this)
        recycleView.layoutManager = glm
        recycleView.setNestedScrollingEnabled(true)
        recycleView.adapter = sectionAdapter
    }

    fun changeColorSelectedSection(view: View,position: Int){

        if(this.viewSection!=null){
            this.viewSection!!.setBackgroundResource(0)
        }
        view.setBackgroundColor(getColor(R.color.colorSectionSelected))
        categoryListAdapter!!.notifyDataSetChanged()

        this.viewSection = view
    }

    fun getSections():List<Categoria>{
        categoryService.namedb = namedbanko
        return categoryService.listCategorias()
    }
}

var selectedPosition: Int = -1

...

fun changeColorSelectedSection(position: Int) {
    selectedPosition = position
    categoryListAdapter?.notifyDataSetChanged()
}

类别列表视图持有者

...

fun onBindItemView(itemSection: Categoria, position: Int) {
    ...

    val backgroundResourceId = if (position == menuActivity.selectedPosition) R.color.colorSectionSelected else 0
    itemView.setBackgroundResource(backgroundResourceId)
}