blocks|key|1053264|text|您需要添加意图标志，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1053265|intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);|code-block|syntax|javascript|1053266|或|1053267|在触发intent之后调用"finish();“。|offset|length|style|CODE|1053268|entityMap^0|0|0|0|E|9|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]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

You need to add the Intent flag,

<pre><code>intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
</code></pre>

Or

call "<code>finish();</code>" after firing the intent.

blocks|key|1268098|text|Android还专门为此提供了一个主题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268099|android:theme="@android:style/Theme.NoDisplay"|code-block|syntax|javascript|1268100|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|$]]

Android also provides a theme specifically for this:

<pre><code>android:theme="@android:style/Theme.NoDisplay"
</code></pre>

blocks|key|1053316|text|在清单中声明活动时，请使用主题"@android:style/Theme.Translucent.NoTitleBar"|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1053317|例如：|1053318|<activity+android:name="yourActivityName"+android:label="@string/app_name"+android:theme="@android:style/Theme.Translucent.NoTitleBar">|code-block|syntax|javascript|1053319|entityMap^0|F|19|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

In your manifest, when you declare the activity, use theme <code>"@android:style/Theme.Translucent.NoTitleBar"</code>

Ex:

<pre><code>&lt;activity android:name="yourActivityName" android:label="@string/app_name" android:theme="@android:style/Theme.Translucent.NoTitleBar"&gt;
</code></pre>

blocks|key|1268335|text|如果你使用的是Android+6.0%2B或者目标SDK是23%2B，有一个主题android:theme+=+"@android:style/Theme.NoDisplay"会导致系统崩溃并返回错误did+not+call+finish()+prior+to+onResume()+completing。这实际上是一个被谷歌开发者here识别出的错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1268336|因此，建议使用具有以下主题的活动作为解决方法。|1268337|android:theme+=+"@android:style/Theme.Translucent.NoTitleBar"|1268338|entityMap|0|LINK|mutability|MUTABLE|url|https://web.archive.org/web/20151116170752/https://code.google.com/p/android-developer-preview/issues/detail?id=2353^0|10|1C|2O|1G|4I|4|0|0|0|0|1P|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@$9|W|A|X|1|Y]]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]]]

Just in case you are using Android 6.0+ or Target SDK is 23+, having a theme <code>android:theme = "@android:style/Theme.NoDisplay"</code> will lead to a crash with error <code>did not call finish() prior to onResume() completing</code>. This in fact is a bug recognised by Google developers <a href="https://web.archive.org/web/20151116170752/https://code.google.com/p/android-developer-preview/issues/detail?id=2353" rel="noreferrer">here</a>.

So it is recommended to use an activity with following theme as a workaround.

<code>android:theme = "@android:style/Theme.Translucent.NoTitleBar"</code>

blocks|key|1268071|text|使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268072|<activity+android:name="yourActivityName"+android:label="@string/app_name"+android:theme="@android:style/Theme.Translucent.NoTitleBar">|code-block|syntax|javascript|1268073|Brian515提到的效果很好。此方法可用于创建入口点活动，该活动决定调用哪个活动、启动哪个活动、服务等，而不必向用户显示UI。记住在你开始你的意图之后使用finish()。|offset|length|style|CODE|1268074|entityMap^0|0|0|26|8|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Using 

<pre><code>&lt;activity android:name="yourActivityName" android:label="@string/app_name" android:theme="@android:style/Theme.Translucent.NoTitleBar"&gt;
</code></pre>

mentioned by Brian515 works great. This method is useful for creating an entry point Activity that decides on which activity to call, start, services, etc without having to show a UI to the user. Remember to use <code>finish()</code> after you have started your intent.

blocks|key|1268240|text|我认为这会对你有很大的帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1268241|<activity++android:name+=+"MyActivity"+
++++++++++android:label+=+"@string/app_name"+
++++++++++android:theme+=+"@android:style/Theme.NoDisplay"+>|code-block|syntax|javascript|1268242|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 think this would help you a lot:

<pre><code>&lt;activity android:name = "MyActivity" 
 android:label = "@string/app_name" 
 android:theme = "@android:style/Theme.NoDisplay" &gt;
</code></pre>

blocks|key|1053663|text|我使用的是AppCompatActivity，这里提供的解决方案并没有解决我的问题。以下是对我起作用的方法。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1053664|我在我的styles.xml中添加了以下内容。|1053665|<style+name="AppTheme"+parent="Theme.AppCompat.Light.NoActionBar">
++++++++
</style>

<style+name="AppTheme.NoDisplay">
++++<item+name="android:windowBackground">@null</item>
++++<item+name="android:windowContentOverlay">@null</item>
++++<item+name="android:windowIsTranslucent">true</item>
++++<item+name="android:windowAnimationStyle">@null</item>
++++<item+name="android:windowDisablePreview">true</item>
++++<item+name="android:windowNoDisplay">true</item>
</style>|code-block|syntax|javascript|1053666|然后，对于我想要禁用显示的任何活动，我修改如下：|1053667|<activity+
++++android:name=".NoDisplayActivity"
++++android:theme="@style/AppTheme.NoDisplay">|1053668|干杯!|1053669|entityMap^0|5|H|0|4|A|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

I am using <code>AppCompatActivity</code> and the solutions provided in this SO did not solve my problem. Here is what worked for me.

I added the following in my <code>styles.xml</code>.

<pre><code>&lt;style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar"&gt;
 &lt;!-- Customize your theme here. --&gt;
&lt;/style&gt;

&lt;style name="AppTheme.NoDisplay"&gt;
 &lt;item name="android:windowBackground"&gt;@null&lt;/item&gt;
 &lt;item name="android:windowContentOverlay"&gt;@null&lt;/item&gt;
 &lt;item name="android:windowIsTranslucent"&gt;true&lt;/item&gt;
 &lt;item name="android:windowAnimationStyle"&gt;@null&lt;/item&gt;
 &lt;item name="android:windowDisablePreview"&gt;true&lt;/item&gt;
 &lt;item name="android:windowNoDisplay"&gt;true&lt;/item&gt;
&lt;/style&gt;
</code></pre>

Then, for any activity that I want to disable the display, I modified like so:

<pre><code>&lt;activity 
 android:name=".NoDisplayActivity"
 android:theme="@style/AppTheme.NoDisplay"&gt;
</code></pre>

Cheers!

blocks|key|1053565|text|在您的清单中添加上面一些答案中提到的@android:style/Theme.Translucent.NoTitleBar"。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1053566|还要从activity.java文件中删除setContentView(R.layout.your_activity);行。|1053567|entityMap^0|I|18|0|L|13|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

In your manifest add <code>@android:style/Theme.Translucent.NoTitleBar"</code> as mentioned in some of the answers above.

Also remove the <code>setContentView(R.layout.your_activity);</code> line from your activity.java file.

blocks|key|1053517|text|我在onResume()中使用了moveTaskToBack(true)将整个活动堆栈放在后台。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1053518|entityMap^0|2|A|G|K|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I had used <code>moveTaskToBack(true)</code> in <code>onResume()</code> to put the entire activity stack in background.

blocks|key|1053472|text|如果您没有与UI进行交互，那么您尝试做的事情听起来更像是一项android服务。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1053473|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 are not interacting with the UI, what you are trying to do sounds more like an android service.

Is it in any way possible to launch an activity from the main function without having a UI? i.e. is there a way to create a sort of "wrapper" around another activity, i.e. by launching the main activity, it takes you to another activity automatically. 

If that is not possible, is there a way to remove the main activity from the stack so that clicking the back button does not take you to a blank UI?
Here's an example of what I'm trying to do:

<pre><code>public class WrapperActivity extends Activity {

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 final Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:555-1212"));
 startActivity(intent);
 }
}
</code></pre>

How to launch an Activity without a UI?

Android

有没有可能在没有UI的情况下从主函数启动一个活动？也就是说，有没有一种方法可以围绕另一个活动创建一种“包装器”，即通过启动主活动，它会自动将您带到另一个活动。如果这是不可能的，有没有办法从堆栈中删除主活动，这样单击back按钮就不会进入空白UI？下面是我想要做的一个例子：public class WrapperActivity extends Activity {    /** Called wh

问如何在没有UI的情况下启动活动？
EN

回答 10

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在没有UI的情况下启动活动？EN

回答 10

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在没有UI的情况下启动活动？
EN