blocks|key|815319|text|获取所用根布局的句柄，然后在其上设置背景色。根布局是您用来调用setContentView的任何东西。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|815320|+setContentView(R.layout.main);

++//+Now+get+a+handle+to+any+View+contained+
++//+within+the+main+layout+you+are+using
++View+someView+=+findViewById(R.id.randomViewInMainLayout);

++//+Find+the+root+view
++View+root+=+someView.getRootView();

++//+Set+the+color
++root.setBackgroundColor(getResources().getColor(android.R.color.red));|code-block|syntax|javascript|815321|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|$]]

Get a handle to the root layout used, then set the background color on that. The root layout is whatever you called setContentView with.

<pre><code> setContentView(R.layout.main);

 // Now get a handle to any View contained 
 // within the main layout you are using
 View someView = findViewById(R.id.randomViewInMainLayout);

 // Find the root view
 View root = someView.getRootView();

 // Set the color
 root.setBackgroundColor(getResources().getColor(android.R.color.red));
</code></pre>

blocks|key|815392|text|在setContentView()调用之后，在您的活动中添加这一行|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|815393|getWindow().getDecorView().setBackgroundColor(Color.WHITE);|code-block|syntax|javascript|815394|entityMap^0|1|G|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Add this single line in your activity, after <code>setContentView()</code> call

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

blocks|key|1030172|text|我更喜欢按主题着色。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1030173|<style+name="CustomTheme"+parent="android:Theme.Light">
++++<item+name="android:windowBackground">@color/custom_theme_color</item>
++++<item+name="android:colorBackground">@color/custom_theme_color</item>
</style>|code-block|syntax|javascript|1030174|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|$]]

I prefer coloring by theme

<pre><code>&lt;style name="CustomTheme" parent="android:Theme.Light"&gt;
 &lt;item name="android:windowBackground"&gt;@color/custom_theme_color&lt;/item&gt;
 &lt;item name="android:colorBackground"&gt;@color/custom_theme_color&lt;/item&gt;
&lt;/style&gt;
</code></pre>

blocks|key|815295|text|?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="#FFFFFF"
android:id="@%2Bid/myScreen"
</LinearLayout>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|815296|换句话说，“android:android”是您想要更改的XML标记。|unstyled|815297|如果您需要动态更新背景值，请参见以下内容：|815298|Exercise:+Change+background+color,+by+SeekBar|offset|length|815299|entityMap|0|LINK|mutability|MUTABLE|url|http://android-er.blogspot.com/2009/08/change-background-color-by-seekbar.html^0|0|0|0|0|19|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|F|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|F|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<pre><code>?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="#FFFFFF"
android:id="@+id/myScreen"
&lt;/LinearLayout&gt;
</code></pre>

In other words, "android:background" is the tag in the XML you want to change.

If you need to dynamically update the background value, see the following:

<a href="http://android-er.blogspot.com/2009/08/change-background-color-by-seekbar.html">Exercise: Change background color, by SeekBar</a>

blocks|key|1030280|text|您可以使用它来调用预定义的android颜色：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1030281|element.setBackgroundColor(android.R.color.red);|code-block|syntax|javascript|1030282|如果你想使用你自己的自定义颜色，你可以将你的自定义颜色添加到strings.xml中，然后使用下面的代码来调用它。|1030283|element.setBackgroundColor(R.color.mycolour);|1030284|但是，如果您想在layout.xml中设置颜色，您可以修改以下内容，并将其添加到任何接受它的元素中。|1030285|android:background="#FFFFFF"|1030286|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You can use this to call predefined android colours:

<pre><code>element.setBackgroundColor(android.R.color.red);
</code></pre>

If you want to use one of your own custom colours, you can add your custom colour to strings.xml and then use the below to call it.

<pre><code>element.setBackgroundColor(R.color.mycolour);
</code></pre>

However if you want to set the colour in your layout.xml you can modify and add the below to any element that accepts it.

<pre><code>android:background="#FFFFFF"
</code></pre>

blocks|key|1030336|text|要获得在xml文件中定义的根视图，可以使用以下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1030337|View+root+=+((ViewGroup)+findViewById(android.R.id.content)).getChildAt(0);|code-block|syntax|javascript|1030338|因此，要将颜色更改为白色：|1030339|root.setBackgroundResource(Color.WHITE);|1030340|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

To get the root view defined in your xml file, without action bar, you can use this:

<pre><code>View root = ((ViewGroup) findViewById(android.R.id.content)).getChildAt(0);
</code></pre>

So, to change color to white:

<pre><code>root.setBackgroundResource(Color.WHITE);
</code></pre>

blocks|key|815514|text|View+randview+=+new+View(getBaseContext());
randview+=+(View)findViewById(R.id.container);
randview.setBackgroundColor(Color.BLUE);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|815515|对我很管用。谢谢。|unstyled|815516|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>View randview = new View(getBaseContext());
randview = (View)findViewById(R.id.container);
randview.setBackgroundColor(Color.BLUE);
</code></pre>

worked for me. thank you.

blocks|key|1030370|text|final+View+rootView+=+findViewById(android.R.id.content);
rootView.setBackgroundResource(...);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1030371|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>final View rootView = findViewById(android.R.id.content);
rootView.setBackgroundResource(...);
</code></pre>

blocks|key|1030384|text|Button+btn;
View+root;
@Override
protected+void+onCreate(Bundle+savedInstanceState)+{
++++super.onCreate(savedInstanceState);
++++setContentView(R.layout.activity_main);
++++btn+=+(Button)findViewById(R.id.button);

++++btn.setOnClickListener(new+View.OnClickListener()+{
++++++++@Override
++++++++public+void+onClick(View+view)+{
++++++++++++root+=findViewById(R.id.activity_main).getRootView();
++++++++++++root.setBackgroundColor(Color.parseColor("#FFFFFF"));
++++++++}
++++});
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1030385|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Button btn;
View root;
@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 btn = (Button)findViewById(R.id.button);

 btn.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View view) {
 root =findViewById(R.id.activity_main).getRootView();
 root.setBackgroundColor(Color.parseColor("#FFFFFF"));
 }
 });
}
</code></pre>

blocks|key|815568|text|对于活动|type|unstyled|depth|inlineStyleRanges|entityRanges|data|815569|findViewById(android.R.id.content).setBackgroundColor(color)|code-block|syntax|javascript|815570|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|$]]

for activity
<pre><code>findViewById(android.R.id.content).setBackgroundColor(color)
</code></pre>

How can I set the background color of an Activity to white programatically?

How to set background color of an Activity to white programmatically?

如何通过编程将活动的背景颜色设置为白色？

问如何以编程方式将活动的背景颜色设置为白色？
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问如何以编程方式将活动的背景颜色设置为白色？EN

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问如何以编程方式将活动的背景颜色设置为白色？
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