当布局中有很多孩子时，如何向Android布局添加垂直滚动条？
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How to add a vertical scroll bar to Android layout when there many children in the layout?
提问by deucalion0
I have been trying to figure out how to ensure the screen can be scrolled vertically as there are many radio buttons and they don't fit on the screen. I have tried most of the solutions posted on Stackoverflow, but I keep getting errors, here is my layout code at my last attempt:
我一直在试图弄清楚如何确保屏幕可以垂直滚动，因为有很多单选按钮并且它们不适合屏幕。我已经尝试了 Stackoverflow 上发布的大多数解决方案，但我不断收到错误，这是我最后一次尝试时的布局代码：
<?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="match_parent"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RadioGroup
android:id="@+id/radioSharing"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="@+id/radioSharingYes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_sharing_yes" />
<RadioButton
android:id="@+id/radioSharingNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_sharing_no" />
</RadioGroup>
<RadioGroup
android:id="@+id/radioInternet"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="@+id/radioInternetYes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_internet_yes" />
<RadioButton
android:id="@+id/radioInternetNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_internet_no" />
</RadioGroup>
<RadioGroup
android:id="@+id/radioMap"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="@+id/radioMapYes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_map_yes" />
<RadioButton
android:id="@+id/radioMapNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_map_no" />
</RadioGroup>
<RadioGroup
android:id="@+id/radioCalling"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="@+id/radioCallingYes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_calling_yes" />
<RadioButton
android:id="@+id/radioCallingNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_calling_no" />
</RadioGroup>
<RadioGroup
android:id="@+id/radioDatabase"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="@+id/radioDatabaseYes"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_database_yes" />
<RadioButton
android:id="@+id/radioDatabaseNo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radio_database_no" />
</RadioGroup>
<Button
android:id="@+id/btnSave"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:text="@string/btn_display" />
</LinearLayout>
</ScrollView>
The error I am getting is : "ScrollView can host only one direct child"
我得到的错误是：“ScrollView 只能承载一个直系子节点”
Any advice would be appreciated, Thanks
任何建议将不胜感激，谢谢
回答by Izkata
Take a closer look at your nesting:
仔细看看你的嵌套：
<?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="match_parent"
android:orientation="vertical">
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RadioGroup
......
</RadioGroup>
</LinearLayout>
</ScrollView>
You should have LinearLayout entirely within ScrollView, like so:
您应该在 ScrollView 中完全使用 LinearLayout，如下所示：
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RadioGroup
......
</RadioGroup>
</LinearLayout>
</ScrollView>
回答by Victor Pozdnyakov
The first answer has got one mistake.
第一个答案有一个错误。
instead
反而
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
......
</ScrollView>
use
用
<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
......
</ScrollView>
