blocks|key|671188|text|尝试在您的Activity中创建一个方法，类似于...|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|671189|public+void+setActivityBackgroundColor(int+color)+{
++++View+view+=+this.getWindow().getDecorView();
++++view.setBackgroundColor(color);
}|code-block|syntax|javascript|671190|然后从你的OnClickListener调用它，传入你想要的任何颜色。|671191|entityMap^0|5|8|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Try creating a method in your <code>Activity</code> something like...

<pre><code>public void setActivityBackgroundColor(int color) {
 View view = this.getWindow().getDecorView();
 view.setBackgroundColor(color);
}
</code></pre>

Then call it from your OnClickListener passing in whatever colour you want.

blocks|key|456962|text|如果你把你的完整代码放在这里，我就可以帮你了。如果您在XML中设置侦听器并在View上调用设置的背景色，因此它将更改视图的背景色，因此将您的侦听器置于您的活动中，然后更改视图的颜色|type|unstyled|depth|inlineStyleRanges|entityRanges|data|456963|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

if you put your full code here so i can help you. if your setting the listener in XML and calling the set background color on View so it will change the background color of the view means it ur Botton so put ur listener in ur activity and then change the color of your view

blocks|key|671254|text|我不知道这是否是您问题的答案，但是您可以尝试像这样设置xml布局中的背景色。这很简单，它总是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|671255|<?xml+version="1.0"+encoding="utf-8"?>

<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"

++++android:orientation="vertical"

++++android:layout_width="fill_parent"

++++android:layout_height="fill_parent"

+android:background="0xfff00000"

++>


<TextView

++++android:id="@%2Bid/text_view"

++++android:layout_width="fill_parent"

++++android:layout_height="wrap_content"

++++android:text="@string/hello"

++++/>



</LinearLayout>|code-block|syntax|javascript|671256|你还可以通过创建一个带有渐变的xml背景文件来对背景做更多花哨的事情，这些渐变很酷，而且是半透明的，并参考它以用于其他用途请参见下面的示例：|671257|background.xml布局|671258|<?xml+version="1.0"+encoding="utf-8"?>
<selector+xmlns:android="http://schemas.android.com/apk/res/android">
<item>
++++<shape>
++++++++<gradient
++++++++++++android:angle="90"
++++++++++++android:startColor="#f0000000"
++++++++++++android:endColor="#ff444444"
++++++++++++android:type="linear"+/>
++++</shape>
</item>
</selector>|671259|你的布局|671260|<?xml+version="1.0"+encoding="utf-8"?>

<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"

++++android:orientation="vertical"

++++android:layout_width="fill_parent"

++++android:layout_height="fill_parent"

+android:background="@layout/background"


++++>


<TextView

++++android:id="@%2Bid/text_view"

++++android:layout_width="fill_parent"

++++android:layout_height="wrap_content"

++++android:text="@string/hello"

++++/>



</LinearLayout>|671261|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

i don't know if it's the answer to your question but you can try setting the background color in the xml layout like this. It is easy, it always works

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&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"

 android:background="0xfff00000"

 &gt;


&lt;TextView

 android:id="@+id/text_view"

 android:layout_width="fill_parent"

 android:layout_height="wrap_content"

 android:text="@string/hello"

 /&gt;



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

You can also do more fancy things with backgrounds by creating an xml background file with gradients which are cool and semi transparent, and refer to it for other use see example below:

the background.xml layout

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;selector xmlns:android="http://schemas.android.com/apk/res/android"&gt;
&lt;item&gt;
 &lt;shape&gt;
 &lt;gradient
 android:angle="90"
 android:startColor="#f0000000"
 android:endColor="#ff444444"
 android:type="linear" /&gt;
 &lt;/shape&gt;
&lt;/item&gt;
&lt;/selector&gt;
</code></pre>

your layout

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&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"

 android:background="@layout/background"


 &gt;


&lt;TextView

 android:id="@+id/text_view"

 android:layout_width="fill_parent"

 android:layout_height="wrap_content"

 android:text="@string/hello"

 /&gt;



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

blocks|key|671327|text|您还可以尝试为主布局提供一个Id，并通过基本的操作和检索更改其背景。例如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|671328|<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@%2Bid/hello"|code-block|syntax|javascript|671329|然后可以通过R.id.hello访问...非常基础，我希望这能有所帮助:)|671330|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can also try and provide an Id for the main layout and change the background of that through basic manipulation and retrieval. E.g:

<pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/hello"
</code></pre>

Which can then be followed by accessing through R.id.hello.... Pretty basic and I hope this does help :)

blocks|key|457142|text|只需在相应活动XML文件中添加下面一行代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|457143|android:background="@android:color/black"+|code-block|syntax|javascript|457144|这肯定会对你有帮助。|457145|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Just add this below one line code in the XML file of that corresponding activity:

<pre><code>android:background="@android:color/black" 
</code></pre>

it will help you for sure.

blocks|key|457187|text|我只想补充我的两分钱。我也有相同的目标(更改.java类的背景颜色)。但上述方法对我都不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|457188|问题是，我使用android:background="@color/colorGray"在布局.xml文件中设置了背景颜色|offset|length|style|CODE|457189|<?xml+version="1.0"+encoding="utf-8"?>
<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++android:layout_width="fill_parent"
++++android:layout_height="fill_parent"
++++android:background="@color/colorGray">|code-block|syntax|javascript|457190|所以我只删除了特定的一行：|457191|<?xml+version="1.0"+encoding="utf-8"?>
<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++android:layout_width="fill_parent"
++++android:layout_height="fill_parent">|457192|现在我(你)可以使用以下命令从代码中设置颜色：|457193|getWindow().getDecorView().setBackgroundColor(Color.GRAY);|457194|entityMap^0|0|7|11|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|J|7|14|8|@]|9|@]|A|$K|L]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

I just want to add my 2 cents. 
I had the same goal (to change the background color from the .java class). But none of the above methods worked for me. 

Issue was, that I set the background color inside the layout .xml file with <code>android:background="@color/colorGray"</code>:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="@color/colorGray"&gt;
</code></pre>

So I just deleted particular line:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"&gt;
</code></pre>

Now I (you) can set the color from the code with:

<pre><code>getWindow().getDecorView().setBackgroundColor(Color.GRAY);
</code></pre>

blocks|key|457210|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|457211|​|457212|<?xml+version="1.0"+encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++xmlns:app="http://schemas.android.com/apk/res-auto"
++++xmlns:tools="http://schemas.android.com/tools"
++++android:layout_width="match_parent"
++++android:layout_height="match_parent"
++++tools:context=".MainActivity">
<LinearLayout
++++android:layout_width="match_parent"
++++android:layout_height="match_parent"
++++android:background="@color/colorPrimaryDark"


</androidx.constraintlayout.widget.ConstraintLayout>
++++/>|code-block|syntax|javascript|457213|457214|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

Try this:
<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity"&gt;
&lt;LinearLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="@color/colorPrimaryDark"


&lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;
 /&gt;</code></pre>
</div>
</div>

blocks|key|457255|text|你应该用xml编写，背景是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|457256|android:background="@drawable/imgname"|code-block|syntax|javascript|457257|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You should write in xml where background i
<pre><code>android:background=&quot;@drawable/imgname&quot;
</code></pre>

blocks|key|457282|text|只需转到activity_main.xml文件。你会在右边看到一个属性面板，在那里你会找到一个叫做"background“的属性。你可以在那里设置颜色。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|457283|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Just go to the activity_main.xml file. You will see an attributes panel on the right hand side, there you will find an attribute called &quot;background&quot;. You can set the color over there.

I want to change the background color of my Main-View (not a Button or a Text-View) just the real background which is usually black... I got this code:

<pre><code>view.setBackgroundColor(0xfff00000);
</code></pre>

This is inside an <code>OnClickListener</code>, but it just changes the background of the Button.

Android: Changing Background-Color of the Activity (Main View)

我想改变我的主视图(不是按钮或文本视图)的背景颜色只是真实的背景，它通常是黑色的…我得到了这样的代码：view.setBackgroundColor(0xfff00000);这是在一个OnClickListener中，但它只是改变了按钮的背景。

问Android:更改活动的背景颜色(主视图)
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