blocks|key|931506|text|您不能以这种方式向小部件添加滚动条。您可以将小部件包装在ScrollView中。下面是一个简单的例子：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|931507|<ScrollView+xmlns:android="http://schemas.android.com/apk/res/android"
++++android:layout_width="fill_parent"
++++android:layout_height="wrap_content">
++++<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++++++android:orientation="vertical"
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="fill_parent">
++++++++<TextView
++++++++++++android:layout_width="fill_parent"
++++++++++++android:layout_height="wrap_content"
++++++++++++android:id="@%2Bid/txt"/>
++++</LinearLayout>
</ScrollView>|code-block|syntax|javascript|931508|如果您想在代码中完成此操作：|931509|ScrollView+sv+=+new+ScrollView(this);
//Add+your+widget+as+a+child+of+the+ScrollView.
sv.addView(wView);|931510|entityMap^0|S|A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|P|$]]

You can't add a scrollbar to a widget that way. You can wrap your widget inside a <code>ScrollView</code>. Here's a simple example:

<pre><code>&lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"&gt;
 &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:orientation="vertical"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"&gt;
 &lt;TextView
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:id="@+id/txt"/&gt;
 &lt;/LinearLayout&gt;
&lt;/ScrollView&gt;
</code></pre>

If you want to do it in code:

<pre><code>ScrollView sv = new ScrollView(this);
//Add your widget as a child of the ScrollView.
sv.addView(wView);
</code></pre>

blocks|key|931585|text|无法将滚动条添加到LinearLayout，因为它不是可滚动容器。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|931586|只有ScrollView、HorizontalScrollView、ListView、GridView、ExpandableListView等可滚动容器才会显示滚动条。|931587|我建议你把你的LinearLayout放在一个ScrollView里面，如果有足够的内容可以滚动，默认情况下会显示垂直滚动条。|931588|<ScrollView
++++android:layout_width="fill_parent"
++++android:layout_height="fill_parent"
++++>

++++<LinearLayout
++++++++android:layout_width="fill_parent"
++++++++android:layout_height="wrap_content"
++++++++>

+++++++++++

++++</LinearLayout>
</ScrollView>|code-block|syntax|javascript|931589|如果您希望始终显示垂直滚动条，则将android:scrollbarAlwaysDrawVerticalTrack="true"添加到您的ScrollView。注意：LinearLayout的高度设置为wrap_content+-这意味着如果有足够的内容，LinearLayout的高度可以大于ScrollView的高度-在这种情况下，您将能够上下滚动LinearLayout。|931590|entityMap^0|9|C|0|2|A|D|K|Y|8|17|8|1G|I|0|7|C|N|A|0|0|H|1B|1X|A|2B|C|2T|C|3K|C|43|A|4W|C|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1B|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1C|8|@$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]|$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1R|8|@]|D|@]|E|$]]]|R|$]]

You cannot add scrollbars to a <code>LinearLayout</code> because it is not a scrollable container.

Only scrollable containers such as <code>ScrollView</code>, <code>HorizontalScrollView</code>, <code>ListView</code>, <code>GridView</code>, <code>ExpandableListView</code> show scrollbars.

I suggest you place your <code>LinearLayout</code> inside a <code>ScrollView</code> which will by default show vertical scrollbars if there is enough content to scroll.

<pre><code>&lt;ScrollView
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 &gt;

 &lt;LinearLayout
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 &gt;

 &lt;!-- Your content goes here --&gt; 

 &lt;/LinearLayout&gt;
&lt;/ScrollView&gt;
</code></pre>

If you want the vertical scrollbar to always be shown, then add <code>android:scrollbarAlwaysDrawVerticalTrack="true"</code> to your <code>ScrollView</code>. Note the height of the <code>LinearLayout</code> is set to <code>wrap_content</code> - this means the height of the <code>LinearLayout</code> can be larger than that of the <code>ScrollView</code> if there is enough content - in that case you will be able to scroll your <code>LinearLayout</code> up and down.

How do I add scrollbars to a view in Android?

I tried by adding <code>android:scrollbars:"vertical"</code> to the <code>LinearLayout</code> in my layout XML file but it is not working. 

I thought scrollbars were drawn by default in Android but it does not seem that way. It seems we have to draw it ourselves - how do I do this?

How do I add scrollbars to a LinearLayout in Android?

Android

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如何在Android中将滚动条添加到视图？我尝试在我的布局XML文件中将android:scrollbars:"vertical"添加到LinearLayout中，但它不起作用。我以为在Android中滚动条是默认绘制的，但看起来并非如此。似乎我们必须自己画它-我该怎么做呢？

问如何在安卓系统中为LinearLayout添加滚动条？
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