如何在Kotlin中将ListView放入ScrollView而不使其在Android中折叠?
此示例演示如何在Kotlin中将ListView放入ScrollView而不使其在Android中折叠。
步骤1 − 在Android Studio中创建一个新项目,转到文件?新建项目,并填写所有必需的详细信息以创建新项目。
步骤2 − 将以下代码添加到res/layout/activity_main.xml。
示例
<?xml version="1.0" encoding="utf-8"?> <ScrollView 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:padding="4dp" tools:context=".MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ListView android:id="@+id/listView" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </LinearLayout> </ScrollView>
步骤3 − 将以下代码添加到src/MainActivity.kt
import android.os.Bundle
import android.widget.ArrayAdapter
import android.widget.ListView
import androidx.appcompat.app.AppCompatActivity
class MainActivity : AppCompatActivity() {
private val listViewArray = arrayOf(
"ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE",
"TEN", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen"
)
lateinit var list: ListView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
title = "KotlinApp";
list = findViewById(R.id.listView)
list.adapter = ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, listViewArray)
ListHelper.getListViewSize(list)
}
}步骤4 − 创建一个新的Kotlin类ListHelper.kt并添加以下代码
import android.util.Log
import android.widget.ListAdapter
import android.widget.ListView
object ListHelper {
fun getListViewSize(myListView: ListView) {
val myListAdapter: ListAdapter = myListView.adapter
?: //do nothing return null
return
//set listAdapter in loop for getting final size
var totalHeight = 0
for (size in 0 until myListAdapter.count) {
val listItem = myListAdapter.getView(size, null, myListView)
listItem.measure(0, 0)
totalHeight += listItem.measuredHeight
}
//setting listView item in adapter
val params = myListView.layoutParams
params.height =
totalHeight + myListView.dividerHeight * (myListAdapter.count - 1)
myListView.layoutParams = params
// print height of adapter on log
Log.i("height of listItem:", totalHeight.toString())
}
}步骤5 − 将以下代码添加到androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.q11"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要从Android Studio运行应用程序,请打开您项目中的一个活动文件,然后单击工具栏中的运行图标
。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕

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