GridView 行高和滚动问题 - Android Kotlin

Question

我一直在从事 Android 项目 (Kotlin)，但遇到了一些问题。

项目概况及问题：

问题 1：我正在开发一个带有导航抽屉和片段的应用程序。在我的一个片段中，我使用了一个 gridview，它有 cardview 元素（参考第一张图片）。我在图片下方提供了代码。 (在ProductFragment.kt中仅参考category_list和对应的代码)

fragment_product.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:fitsSystemWindows="true"
tools:context=".Fragments.ProductFragment">

<GridView
    android:id="@+id/product_gridview"
    android:columnWidth="100dp"
    android:verticalSpacing="15dp"
    tools:listitem="@layout/gridview_card_item"
    android:horizontalSpacing="15dp"
    android:numColumns="auto_fit"
    android:layout_margin="10dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

</LinearLayout>

gridview_card_item.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:cardCornerRadius="8dp"
app:cardPreventCornerOverlap="true"
android:layout_margin="10dp"
app:cardElevation="5dp">

<RelativeLayout
    android:layout_width="match_parent"
    android:padding="10dp"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/gridview_card_item_logo"
        android:layout_width="90dp"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="5dp"
        android:src="@drawable/paypal"
        android:layout_height="90dp"/>
    
    <TextView
        android:id="@+id/gridview_card_item_name"
        android:text="Learning and Educational Toys"
        android:breakStrategy="simple"
        android:ellipsize="none"
        android:textAlignment="center"
        android:textStyle="bold"
        android:layout_below="@+id/gridview_card_item_logo"
        android:layout_centerHorizontal="true"
        android:textColor="#000000"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</RelativeLayout>
</androidx.cardview.widget.CardView>

Product_Fragment.kt

class ProductFragment : Fragment() {
// TODO: Rename and change types of parameters
private var name: String? = null

val category_list = arrayListOf<GridViewCardItemModel>(
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "Musical Toys"
    ),
    GridViewCardItemModel(
        R.drawable.ethereum,
        "RC Toys"
    ),
    GridViewCardItemModel(
        R.drawable.paypal,
        "Learning & Educational Toys"
    ),
    GridViewCardItemModel(
        R.drawable.xrp,
        "Play Gyms & Play Mats"
    ),
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "Blocks & Construction Sets"
    ),
    GridViewCardItemModel(
        R.drawable.ethereum,
        "Baby Rattles and Teethers"
    ),
    GridViewCardItemModel(
        R.drawable.paypal,
        "Toy Cars Trains & Vehicles"
    ),
    GridViewCardItemModel(
        R.drawable.xrp,
        "Push & Pull Along Toys"
    ),
    GridViewCardItemModel(
        R.drawable.paypal,
        "Push & Pull Along Toys"
    ),
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "Push & Pull Along Toys"
    )
)
val age_list = arrayListOf<GridViewCardItemModel>(
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "0 to 6 months"
    ),
    GridViewCardItemModel(
        R.drawable.ethereum,
        "6 to 12 months"
    ),
    GridViewCardItemModel(
        R.drawable.paypal,
        "12 to 24 months"
    ),
    GridViewCardItemModel(
        R.drawable.xrp,
        "2 to 4 years"
    ),
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "5 to 7 years"
    ),
    GridViewCardItemModel(
        R.drawable.ethereum,
        "8 to 10 years"
    ),
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "11 to 13 years"
    ),
    GridViewCardItemModel(
        R.drawable.xrp,
        "14 to 15years"
    ),
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "Above 15 years"
    )
)

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    arguments?.let {
        name = it.getString("name")
    }
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    // Inflate the layout for this fragment
    val view = inflater.inflate(R.layout.fragment_product, container, false)
    return view
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    product_gridview.apply {
        if(name=="Category"){
            adapter = GridViewAdapter(
                context,
                category_list
            )
        }else{
            adapter = GridViewAdapter(
                context,
                age_list
            )
        }
    }
}

companion object {
    fun newInstance(name: String) : ProductFragment {
        val args = Bundle()
        args.putString("name",name)
        val fragment = ProductFragment()
        fragment.arguments = args
        return fragment
    }
}
}

GridViewAdapter.kt

 class GridViewAdapter(var context: Context,var ArrayList: 
 ArrayList<GridViewCardItemModel>):BaseAdapter(){
 override fun getView(position: Int, view: View?, parent: ViewGroup?): View {
    var view = View.inflate(context,R.layout.gridview_card_item,null)
    var icon = view.gridview_card_item_logo
    var name = view.gridview_card_item_name

    var listItem = arrayList.get(position)

    icon.setImageResource(listItem.icons)
    name.text = listItem.name
    return view
}

override fun getItem(position: Int): Any  = arrayList.get(position)

override fun getItemId(position: Int): Long = position.toLong()

override fun getCount(): Int = arrayList.size
}

问题 2：请参考第二张图片。这是我家的片段。我在类别下实现了类似的gridview。现在我希望整个页面滚动，而不仅仅是 gridview 部分。我试过将整个 home_fragment 布局放在滚动视图下，但没有帮助。

Fragment_home.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".Fragments.HomeFragment">

<com.denzcoskun.imageslider.ImageSlider
    android:id="@+id/image_slider"
    android:layout_height="200dp"
    android:layout_width="match_parent"
    android:padding="20dp"
    app:iss_selected_dot="@drawable/default_selected_dot"
    app:iss_unselected_dot="@drawable/default_unselected_dot"
    app:iss_error_image="@drawable/error"
    app:iss_auto_cycle="true"
    app:iss_period="1000"
    app:iss_delay="0" />

<TextView
    android:id="@+id/most_selling"
    android:text="Most Selling"
    android:layout_below="@+id/image_slider"
    android:layout_margin="15dp"
    android:textColor="#000000"
    android:textSize="30sp"
    android:textStyle="bold"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/homeRecyclerView"
    android:layout_below="@+id/most_selling"
    android:orientation="horizontal"
    tools:listitem="@layout/cardview_item"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="10dp"/>

<TextView
    android:id="@+id/categories"
    android:text="Categories"
    android:layout_below="@+id/homeRecyclerView"
    android:layout_margin="15dp"
    android:textColor="#000000"
    android:textSize="30sp"
    android:textStyle="bold"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>

<GridView
    android:id="@+id/home_gridview"
    android:columnWidth="100dp"
    android:verticalSpacing="15dp"
    android:horizontalSpacing="15dp"
    android:numColumns="auto_fit"
    android:layout_below="@id/categories"
    android:layout_margin="20dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
</RelativeLayout>

HomeFragment.kt

class HomeFragment : Fragment() {

val view_image_list = arrayListOf<Int>(
    R.drawable.image_slide,
    R.drawable.image_slide_2,
    R.drawable.image_slide_3,
    R.drawable.image_slide_4,
    R.drawable.image_slide_5
)
val view_title_list = arrayListOf<String>("Bali","Thailand","Malaysia","America","France")
val view_price_list = arrayListOf<String>("42,5000","34,000","56,000","78,000","67,000")
val gridviewlist = arrayListOf<GridViewCardItemModel>(
    GridViewCardItemModel(
        R.drawable.bitcoin,
        "Bitcoin"
    ),
    GridViewCardItemModel(
        R.drawable.ethereum,
        "Ethereum"
    ),
    GridViewCardItemModel(
        R.drawable.paypal,
        "Paypal"
    ),
    GridViewCardItemModel(R.drawable.xrp, "XRP")
)


override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_home, container, false)
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    val imageList = ArrayList<SlideModel>()
    imageList.add(SlideModel(R.drawable.image_slide))
    imageList.add(SlideModel(R.drawable.image_slide_2))
    imageList.add(SlideModel(R.drawable.image_slide_3))
    imageList.add(SlideModel(R.drawable.image_slide_4))
    imageList.add(SlideModel(R.drawable.image_slide_5))

    val imageSlider = view.findViewById<ImageSlider>(R.id.image_slider)
    imageSlider.setImageList(imageList,ScaleTypes.FIT)

    homeRecyclerView.apply{
        layoutManager = LinearLayoutManager(activity,LinearLayoutManager.HORIZONTAL,false)
        adapter = HomeRecyclerViewAdapter(
            view_image_list,
            view_title_list,
            view_price_list
        )
    }

    home_gridview.apply {
        adapter = GridViewAdapter(
            context,
            gridviewlist
        )
    }
}
}

Answer 1

问题 1：在 item.xml

的高度和宽度中使用匹配父项

问题二： layout_height="wrap_content" 不能在 GridView 中使用，事实上它不能在 AdapterView 的子类中使用（例如 ListView 和 GridView）。您必须动态计算每个项目的高度，然后相应地设置 gridview 高度。不用做这么多工作，只需使用带有网格布局的 recyclerview 并将其高度设置为 wrap_content

并在此 recyclerview 中禁用嵌套滚动

recycler.setNestedScrollingEnabled(false);

GridView 行高和滚动问题 - Android Kotlin

GridView Problem with row Height and Scrolling - Android Kotlin

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