科特林的动脉冲星滚动视图
原文:https://www . geeksforgeeks . org/dynamichorizontal-scroll view-in-kot Lin/
安卓滚动视图允许滚动父视图组中的多个视图。安卓应用程序中的滚动可以通过两种方式完成:垂直或水平。
在本文中，我们将讨论如何通过编程在 Kotlin 中创建一个水平滚动视图。
让我们首先在安卓工作室创建一个项目。为此，请遵循以下说明:
- 点击文件，然后新建然后新建项目，随便命名
- 然后，选择科特林语言支持，点击下一步按钮。
- 选择最小的软件开发工具包，无论你需要什么。
- 选择清空活动，然后点击完成。
修改 activity_main.xml 文件
在这里，我们将使用 RelativeLayout 从 Kotlin 文件中获取滚动视图。
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="200dp"
android:id="@+id/layout"
android:layout_centerInParent="true"/>
</RelativeLayout>
更新字符串. xml 文件
<resources>
<string name="app_name">DynamicHorizontal ScrollView</string>
</resources>
添加图像
我们需要添加一些图像，可以用于滚动的目的。因此，我们必须将图像从本地计算机路径复制到app/RES/drawing文件夹。
在主活动文件中创建水平滚动视图
打开 app/src/main/Java/your package name/main activity . kt .在这个文件中，我们声明了一个变量 horizontalScrollView 来创建 horizontalScrollView 小部件，如下所示:
val horizontalScrollView = HorizontalScrollView(this)
//setting height and width
val layoutParams = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT)
horizontalScrollView.layoutParams = layoutParams
然后，使用以下命令在布局中添加小部件
val linearLayout1 = findViewById(R.id.layout)
linearLayout1?.addView(horizontalScrollView)
package com.geeksforgeeks.myfirstkotlinapp
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.ViewGroup
import android.widget.HorizontalScrollView
import android.widget.ImageView
import android.widget.LinearLayout
import android.widget.RelativeLayout
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val horizontalScrollView = HorizontalScrollView(this)
//setting height and width
val layoutParams = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT)
horizontalScrollView.layoutParams = layoutParams
val linearLayout = LinearLayout(this)
//setting height and width
val linearParams = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
linearLayout.layoutParams = linearParams
//adding horizontal scroll view to the layout
horizontalScrollView.addView(linearLayout)
val image1 = ImageView(this)
//setting height and width
val params1 = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
image1.layoutParams = params1
//accessing images that we downloaded and copied to
// drawable folder and setting it to imageview
image1.setImageResource(R.drawable.img1)
linearLayout.addView(image1)
val image2 = ImageView(this)
//setting height and width
val params2 = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
image2.layoutParams = params2
//accessing images that we downloaded and copied to
// drawable folder and setting it to imageview
image2.setImageResource(R.drawable.img2)
linearLayout.addView(image2)
val image3 = ImageView(this)
//setting height and width
val params3 = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
image3.layoutParams = params3
//accessing images that we downloaded and copied to
// drawable folder and setting it to imageview
image3.setImageResource(R.drawable.img3)
linearLayout.addView(image3)
val image4 = ImageView(this)
//setting height and width
val params4 = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
image4.layoutParams = params4
//accessing images that we downloaded and copied to
// drawable folder and setting it to imageview
image4.setImageResource(R.drawable.img4)
linearLayout.addView(image4)
val image5 = ImageView(this)
//setting height and width
val params5 = LinearLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT)
image5.layoutParams = params5
//accessing images that we downloaded and copied to
// drawable folder and setting it to imageview
image5.setImageResource(R.drawable.img5)
linearLayout.addView(image5)
//accessing the relative layout where the scrollview will be active
val linearLayout1 = findViewById<RelativeLayout>(R.id.layout)
linearLayout1?.addView(horizontalScrollView)
}
}
AndroidManifest.xml 文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.geeksforgeeks.myfirstkotlinapp">
<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>
作为模拟器运行:
这是 android 应用程序中水平滚动的视频。
