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法律研究如何检测 Android 中 ScrollView 的结尾？
此示例演示如何检测 android 中 scrollView 的结尾。
步骤 1 − 在 Android Studio 中新建一个项目，转到文件 ⇒ 新建项目，并填写所有必需的详细信息以创建一个新项目。
步骤 2 − 将以下代码添加到 res/layout/activity_main.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" tools:context=".MainActivity"> <ScrollView android:id="@+id/scrollView" android:layout_width="match_parent" android:layout_height="match_parent"> <WebView android:id="@+id/webView" android:layout_width="match_parent" android:layout_height="wrap_content"> </WebView> </ScrollView> </RelativeLayout>
步骤 3 − 将以下代码添加到 src/MainActivity.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.webkit.WebView;
import android.widget.ScrollView;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnTouchListener,
ViewTreeObserver.OnScrollChangedListener {
ScrollView scrollView;
WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
scrollView = findViewById(R.id.scrollView);
webView = findViewById(R.id.webView);
scrollView.setOnTouchListener(this);
scrollView.getViewTreeObserver().addOnScrollChangedListener(this);
webView.loadData(getResources().getString(R.string.sample_data), "text/html", null);
}
public void onScrollChanged(){
View view = scrollView.getChildAt(scrollView.getChildCount() - 1);
int topDetector = scrollView.getScrollY();
int bottomDetector = view.getBottom() - (scrollView.getHeight() + scrollView.getScrollY());
if(bottomDetector == 0 ){
Toast.makeText(getBaseContext(),"Scroll View bottom reached",Toast.LENGTH_SHORT).show();
}
if(topDetector <= 0){
Toast.makeText(getBaseContext(),"Scroll View top reached",Toast.LENGTH_SHORT).show();
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
return false;
}
}步骤 4 – 打开 res/values/strings.xml 并添加以下代码 −
<resources>
<string name="app_name">Sample</string>
<string name="sample_data">
<![CDATA[<html>]]>
<![CDATA[<style>]]>
p.small {
line-height: 1.5;
font-size: 12px;
}
<![CDATA[</style>]]>
<![CDATA[<body><p align="justify" class="small">]]>
Chupa chups carrot cake pastry cupcake caramels sugar plum chocolate cupcake tootsie roll.
Cupcake chocolate donut caramels sesame snaps brownie cake halvah.
Sesame snaps sesame snaps gummies candy carrot cake.
Fruitcake bonbon liquorice topping biscuit candy canes fruitcake marzipan cake.
Tart tootsie roll tart gummi bears apple pie danish powder pastry gummies.
Tiramisu sesame snaps icing pudding. Marzipan sweet roll cookie marshmallow.
Tiramisu bear claw bear claw sesame snaps pie marzipan.
Icing candy candy canes danish. Tart lollipop jujubes cake soufflé.
Cheesecake bear claw marshmallow chocolate cake donut sweet.
Tootsie roll topping chocolate bar cupcake cake oat cake oat cake bonbon cotton candy.
Jelly-o croissant dragée lemon drops chocolate bar. Gingerbread cotton candy oat cake marshmallow.
<![CDATA[<br><br>]]>
Lemon drops carrot cake wafer jelly cheesecake chocolate cake gingerbread.
Dessert cookie oat cake pie. Liquorice liquorice dragée lollipop danish jujubes pudding carrot cake.
Jelly beans cotton candy sweet caramels gummies pastry. Wafer wafer muffin sweet roll.
Chocolate topping gummi bears gummies. Oat cake bonbon brownie chocolate bar.
Tart tart gingerbread chupa chups chocolate bar gummies. C
0roissant oat cake ice cream liquorice tootsie roll. Pudding wafer gummies.
Apple pie marshmallow chupa chups. Cookie cheesecake carrot cake jelly beans tiramisu lemon drops.
Bonbon sweet roll wafer.
<![CDATA[<br><br>]]>
Lemon drops muffin bear claw cake gingerbread apple pie lollipop cheesecake.
Powder bear claw marshmallow. Tootsie roll gummi bears wafer brownie.
Sesame snaps soufflé bear claw chocolate danish candy.
Wafer oat cake ice cream pastry cake muffin toffee tootsie roll. Cake oat cake marshmallow.
Gummi bears gingerbread cake danish muffin marzipan donut cotton candy.
Ice cream topping cake candy gummi bears brownie. Marshmallow chocolate icing candy canes topping.
Pastry gummies powder sesame snaps sugar plum sugar plum.
Lemon drops gummies gummi bears tootsie roll powder jelly-o jelly-o.
Lollipop jujubes sweet brownie croissant soufflé chupa chups bear claw.
Sugar plum sugar plum lollipop croissant lemon drops sweet jujubes soufflé sweet roll.
<![CDATA[<br><br>]]>
Liquorice jelly-o candy lollipop croissant sweet icing brownie biscuit.
Wafer dessert cake marzipan gummies jujubes bonbon tootsie roll ice cream.
Chocolate bar bear claw candy canes lemon drops jelly apple pie cotton candy jujubes.
Donut toffee candy canes dragée cake toffee. Icing cookie biscuit cheesecake dragée.
Gummi bears tiramisu sesame snaps muffin halvah. Sweet jujubes chocolate cake muffin pie bonbon cupcake.
Pastry jujubes pastry fruitcake. Jelly beans dessert gingerbread cupcake gingerbread marshmallow carrot cake.
Macaroon carrot cake candy canes jelly powder. Soufflé macaroon liquorice candy canes lollipop.
Marzipan fruitcake fruitcake gummi bears gummies chocolate cake. Jelly sesame snaps topping sweet.
<![CDATA[<br><br>]]>
Chupa chups macaroon muffin. Topping jujubes biscuit tart jujubes pudding.
Brownie oat cake cookie. Lemon drops pudding tiramisu dessert marzipan.
Danish cake candy canes bonbon. Gummi bears carrot cake apple pie lollipop.
Tart candy canes chocolate cake lemon drops carrot cake topping cheesecake apple pie cake.
Bear claw pudding macaroon croissant halvah caramels.
Danish cake pastry sugar plum lollipop ice cream gummi bears gummi bears sugar plum.
Chocolate macaroon tootsie roll. Halvah tootsie roll sweet roll powder gummi bears chocolate cake.
Sugar plum gingerbread brownie. Wafer chocolate cake bonbon ice cream biscuit dragée tiramisu croissant apple pie.
<![CDATA[</p></body></html>]]>
</string>
</resources>步骤 4 – 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="app.com.sample"> <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>
让我们尝试运行你的应用程序。我假定你已将你的安卓移动设备连接到你的电脑上。要从安卓工作室运行该应用程序，请打开你的一个项目的活动文件，并点击工具栏中的运行 
图标。将你的手机设备作为一个选项，然后检查你的安卓设备，它上面会显示你的默认屏幕 –
点击 here 下载项目代码。
更新于：2020 年 7 月 3 日
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