【Android】ListView常规写法

向右看齐 2022-11-16 13:58 180阅读 0赞

### ListView常规用法 ###

> **代码**

*  **Menifest:**

--------------------

*  **Layout:**

`fruit_listview_item:`

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="60dp">
    
        <ImageView
            android:id="@+id/fruit_image"
            android:layout_width="40dp"
            android:layout_height="40dp"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="10dp" />
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/fruit_name"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="10dp"/>
    
    </LinearLayout>

`activity_listview_fruit:`

--------------------

*  **Kotlin:**

`Fruit:`

class Fruit(val name:String,val imageId:Int)

`ListViewAdapter:`

class ListViewAdapter(activity: Activity, private val resourceId: Int, data: List<Fruit>) :
        ArrayAdapter<Fruit>(activity, resourceId, data) {
    
        inner class ViewHolder(val fruitImage:ImageView,val fruitName:TextView)
    
        override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {
            val view: View
            val viewHolder: ViewHolder
            if(convertView== null){
                view=LayoutInflater.from(context).inflate(resourceId, parent, false)
                val fruitImage:ImageView=view.findViewById(R.id.fruit_image)
                val fruitName:TextView=view.findViewById(R.id.fruit_name)
                viewHolder=ViewHolder(fruitImage,fruitName)
                view.tag=viewHolder
            }else{
                view= convertView
                viewHolder=view.tag as ViewHolder
            }
            val fruit = getItem(position)//获取当前项的Fruit实例
            fruit?.let {
                viewHolder.fruitImage.setImageResource(it.imageId)
                viewHolder.fruitName.text = it.name
            }
            return view
        }
    }

`ListViewActivity:`

class ListViewActivity:AppCompatActivity() {
        private val fruitList=ArrayList<Fruit>()
        lateinit var fruitBinding: ActivityListviewFruitBinding
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            fruitBinding= ActivityListviewFruitBinding.inflate(layoutInflater)
            setContentView(fruitBinding.root)
            initFruits()
            val adapter=ListViewAdapter(this, R.layout.fruit_listview_item,fruitList)
            fruitBinding.fruitListView.adapter=adapter
            fruitBinding.fruitListView.setOnItemClickListener { _, _, position, _ ->
                val fruit=fruitList[position]
                Toast.makeText(this,fruit.name,Toast.LENGTH_SHORT).show()
            }
        }
    
        private fun initFruits() {
            repeat(2){
                fruitList.apply {
                    add(Fruit("Apple",R.drawable.fruit))
                    add(Fruit("Pear",R.drawable.fruit))
                    add(Fruit("Banana",R.drawable.fruit))
                    add(Fruit("Watermelon",R.drawable.fruit))
                    add(Fruit("Orange",R.drawable.fruit))
                    add(Fruit("Grape",R.drawable.fruit))
                    add(Fruit("Pineapple",R.drawable.fruit))
                    add(Fruit("Strawberry",R.drawable.fruit))
                    add(Fruit("Cherry",R.drawable.fruit))
                    add(Fruit("Mango",R.drawable.fruit))
                }
            }
        }
    }

--------------------

> **效果**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQ3MzIyOA_size_16_color_FFFFFF_t_70]

--------------------

**纯文字写法:**

*  **Kotlin:**

class SecondActivity : AppCompatActivity() {
        private lateinit var secondBinding: ActivitySecondBinding
        private val data = listOf("Apple","Banana","Orange","Watermelon","Pear","Grape","Pineapple","Strawberry",
        "Cherry","Mango","Apple","Banana","Orange","Watermelon","Pear","Grape","Pineapple","Strawberry")
    
        override fun onCreate(savedInstanceState: Bundle?) {
            super.onCreate(savedInstanceState)
            secondBinding = ActivitySecondBinding.inflate(layoutInflater)
            setContentView(secondBinding.root)
    
            val adapter=ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,data)
            secondBinding.secondListView.adapter=adapter
        }
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MjQ3MzIyOA_size_16_color_FFFFFF_t_70]: /images/20221022/fa546a4fb0ba4e8eb64e46bb373870cb.png