kotlin 为什么在android中所有的图片都不出现在第一列，而textviews出现在第二列？

b4wnujal  于 2023-08-06  发布在  Kotlin
关注(0)|答案(2)|浏览(106)

所以，我有一个图像列表和另一个图像名称列表。我想在第一列的cardviews中显示所有的图像，在第二列的cardviews中显示所有的名称。但我得到了这样的

所以，我希望所有的图片严格在第一列和第二列的名称。

<RelativeLayout 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="match_parent"
    xmlns:tools="http://schemas.android.com/tools">
    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/flash_tablebar"
        android:elevation="4dp"
        android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
        android:layout_alignParentTop="true">

        <ImageView
            android:id="@+id/back_icon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:src="@drawable/ic_arrow_back" />
    </androidx.appcompat.widget.Toolbar>

    <!-- RecyclerView to display the image cards -->
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerViewPractise"
        android:layout_below="@id/toolbar"
        android:layout_width="match_parent"
        tools:listitem="@layout/item_practise_cards"
        android:layout_marginTop="10dp"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="16dp" />

</RelativeLayout>

字符串

item_practice_cards.xml

<GridLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:columnCount="2"
    android:orientation="horizontal"
    android:padding="8dp">

    <androidx.cardview.widget.CardView
        android:id="@+id/cardImagePractise"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="4dp"
        android:onClick="onCardClick"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground">

        <ImageView
            android:id="@+id/imageViewPractise"
            android:layout_width="150dp"
            android:layout_height="150dp"
            android:scaleType="centerCrop" />
    </androidx.cardview.widget.CardView>

    <androidx.cardview.widget.CardView
        android:id="@+id/cardTextPractise"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="4dp"
        android:onClick="onCardClick"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground">

        <TextView
            android:id="@+id/textViewPractise"
            android:layout_width="wrap_content"
            android:gravity="center"
            android:layout_height="wrap_content"
            android:text="Random Name"
            android:textSize="18sp" />
    </androidx.cardview.widget.CardView>
</GridLayout>

型
跟随Fragment类PractiseFragment.kt

package com.example.visuallithuanian.ui.activities.fragments

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.MenuItem
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar
import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.RecyclerView
import com.example.visuallithuanian.R
import com.example.visuallithuanian.adapter.PractiseAdapter
import com.example.visuallithuanian.databinding.FragmentPractiseBinding
import dagger.hilt.android.AndroidEntryPoint
class PractiseFragment : Fragment() {
     lateinit var binding: FragmentPractiseBinding
    lateinit var recyclerView: RecyclerView
    private val imageNamesMap= HashMap<Int,String>()

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        // Inflate the layout for this fragment

        binding = FragmentPractiseBinding.inflate(layoutInflater,container,false)

        (requireActivity() as AppCompatActivity).setSupportActionBar(binding.toolbar)
        (requireActivity() as AppCompatActivity).supportActionBar?.setDisplayHomeAsUpEnabled(true)

        populateImages()

        binding.recyclerViewPractise.layoutManager = GridLayoutManager(requireContext(),2)
       binding.recyclerViewPractise.adapter = PractiseAdapter(imageNamesMap)

        return binding.root

    }

    private fun populateImages() {
        // Add image resources to a list
        val imageResources = listOf(
            R.drawable.africa,
            R.drawable.asia,
            R.drawable.europe,
            R.drawable.antartica,
            R.drawable.australia
            // Add more image resources as needed
        )

        // Add image names to a list in random order
        val imageNames = listOf(
            "Africa",
            "Asia",
            "Europe",
            "Antarctica",
            "Australia"
            // Add more image names corresponding to the resources
        ).shuffled()

        // Use the shuffled names to assign each image resource ID a corresponding name in the imageNamesMap
        for (i in imageResources.indices) {
            imageNamesMap[imageResources[i]] = imageNames[i]
        }
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when(item.itemId){

            android.R.id.home->{
                requireActivity().onBackPressed()
                return true
            }
        }
        return super.onOptionsItemSelected(item)
    }

    // Handle card clicks for both card views
    fun onCardClick(view: View,position: Int) {
        // Check the clicked view's ID to identify which cardView was clicked
        when (view.id) {
            R.id.cardImagePractise -> {
                Toast.makeText(requireContext(),"Hello Card Image",Toast.LENGTH_SHORT).show()
            }
            R.id.cardTextPractise -> {
                Toast.makeText(requireContext(),"Hello Card Text",Toast.LENGTH_SHORT).show()
            }
        }
    }

}

型
下面是适配器类PractiseAdapter.kt

package com.example.visuallithuanian.adapter

import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import android.widget.Toast
import androidx.cardview.widget.CardView
import androidx.recyclerview.widget.RecyclerView
import com.example.visuallithuanian.R

class PractiseAdapter(private val imageNamesMap: HashMap<Int, String>) :
    RecyclerView.Adapter<PractiseAdapter.PractiseViewHolder>() {

    private val imagesList: MutableList<Int> = imageNamesMap.keys.toMutableList()

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PractiseViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_practise_cards, parent, false)
        return PractiseViewHolder(view)
    }

    override fun getItemCount(): Int = imagesList.size

    override fun onBindViewHolder(holder: PractiseViewHolder, position: Int) {
        val imageResource = imagesList[position]
        val imageName = imageNamesMap[imageResource]

        holder.imageViewPractise.setImageResource(imageResource)
        holder.textViewPractise.text = imageName

        holder.cardImagePractise.setOnClickListener {
            onCardClick(it, position)
        }

        holder.cardTextPractise.setOnClickListener {
            onCardClick(it, position)
        }
    }

    class PractiseViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val cardImagePractise: CardView = itemView.findViewById(R.id.cardImagePractise)
        val cardTextPractise: CardView = itemView.findViewById(R.id.cardTextPractise)
        val imageViewPractise: ImageView = itemView.findViewById(R.id.imageViewPractise)
        val textViewPractise: TextView = itemView.findViewById(R.id.textViewPractise)
    }

    private fun onCardClick(view: View, position: Int) {
        // Check the clicked view's ID to identify which cardView was clicked
        when (view.id) {
            R.id.cardImagePractise -> {
                // Handle image card click
                Toast.makeText(view.context, "Image clicked at position $position", Toast.LENGTH_SHORT).show()
            }
            R.id.cardTextPractise -> {
                // Handle text card click
                Toast.makeText(view.context, "Text clicked at position $position", Toast.LENGTH_SHORT).show()
            }
        }
    }
}

型
我相信有一些问题，在xml布局文件

kotlin

2条答案

按热度按时间
kokeuurv

kokeuurv1#

在本例中，您将GridLayoutManager设置为跨度计数为2。这是它在每行两列中显示图像项的方式。
最简单的解决方案是，在recyclerview中设置LinearLayoutManager，方向垂直。
您可以将xml中的LayoutManager设置为

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recyclerViewPractise"
    android:layout_below="@id/toolbar"
    android:layout_width="match_parent"
    tools:listitem="@layout/item_practise_cards"
    **app:layoutManager="android.support.v7.widget.LinearLayoutManager"
    android:orientation="vertical"**
    android:layout_marginTop="10dp"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp" />

字符串
或以编程方式作为

binding.recyclerViewPractise.layoutManager = LinearLayoutManager(requireContext(), LinearLayoutManager.VERTICAL, false)

型
希望这对你有帮助

赞(0）分享  回复(0）举报  2023-08-06
8cdiaqws

8cdiaqws2#

我建议你使用约束布局而不是GridLayout来并排使用CardViews。
因此，您的item_practice_cards.xml将类似于以下内容：

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="8dp">

    <androidx.cardview.widget.CardView
        android:id="@+id/cardImagePractise"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        
        app:layout_constraintEnd_toStartOf="@id/cardTextPractise"
        app:layout_constraintStart_toStartOf="parent"

        android:layout_margin="4dp"
        android:onClick="onCardClick"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground">

        <ImageView
            android:id="@+id/imageViewPractise"
            android:layout_width="150dp"
            android:layout_height="150dp"
            android:scaleType="centerCrop" />
    </androidx.cardview.widget.CardView>

    <androidx.cardview.widget.CardView
        android:id="@+id/cardTextPractise"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        app:layout_constraintStart_toEndOf="@id/cardImagePractise"
        app:layout_constraintEnd_toEndOf="parent"

        android:layout_margin="4dp"
        android:onClick="onCardClick"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground">

        <TextView
            android:id="@+id/textViewPractise"
            android:layout_width="wrap_content"
            android:gravity="center"
            android:layout_height="wrap_content"
            android:text="Random Name"
            android:textSize="18sp" />
    </androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>

字符串

赞(0）分享  回复(0）举报  2023-08-06
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