blocks|key|2632728|text|使用finish()在startActivity(intent)之后完成要启动另一个活动的活动|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2632729|entityMap^0|2|8|B|L|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|$]]

use <code>finish()</code> after <code>startActivity(intent)</code> to finish the activity in which you are starting another activity

blocks|key|1619486|text|您应该使用AddCarActivity方法运行startActivityForResult，然后必须在AddCarActivity中用setResult方法设置结果，该方法将您返回到ListCarsActivity，而无需再次启动它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1619487|正式文件：https://developer.android.com/training/basics/intents/result|1619488|https://developer.android.com/reference/android/app/Activity#setResult(int,%2520android.content.Intent)|1619489|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.android.com/training/basics/intents/result|1|https://developer.android.com/reference/android/app/Activity#setResult(int,%2520android.content.Intent)^0|5|E|N|M|1F|E|1V|9|2J|G|0|5|1O|0|0|0|2T|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|C]|$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|H|3|I|5|6|7|18|8|@]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|J|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|K|$L|$5|M|N|O|E|$P|Q]]|R|$5|M|N|O|E|$P|S]]]]

You should run <code>AddCarActivity</code> with <code>startActivityForResult</code> method, and then you have to set result with <code>setResult</code> method in <code>AddCarActivity</code> which returns you to <code>ListCarsActivity</code> without starting it again

Official documentation:
<a href="https://developer.android.com/training/basics/intents/result" rel="nofollow noreferrer">https://developer.android.com/training/basics/intents/result</a>

<a href="https://developer.android.com/reference/android/app/Activity#setResult(int,%20android.content.Intent)" rel="nofollow noreferrer">https://developer.android.com/reference/android/app/Activity#setResult(int,%20android.content.Intent)</a>

blocks|key|2632812|text|您的方法是有效的，并将按照您的意愿工作。然而，我想在这里提供更多的信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2632813|在您的ListCarsActivity中，单击floatingButton，您将启动一个新的活动AddCarActivity。完成后，单击"Add“按钮，您可以进行保存/发布逻辑并关闭(finish())这个(AddCarActivity)。|offset|length|style|CODE|BOLD|2632814|这样做将防止您再次重新启动相同的活动(ListCarsActivity)。另外，如果关闭(finish())+ListCarsActivity，如果用户从AddCarActivity按back，应用程序将关闭(考虑到只有两个活动)。这绝对是你不想要的。|2632815|相反，您可以在您的onResume中实现ListCarsActivity方法，用新的和更新的数据刷新列表。一旦用户单击"Add“并关闭AddCarActivity，这个相同的函数将被调用。因此，不需要再次使用startActivity。|2632816|entityMap^0|0|3|G|N|E|1C|E|2L|8|2X|E|1X|5|0|J|G|19|8|1J|G|25|E|2K|4|0|9|8|K|G|1V|E|1N|5|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]|$D|S|E|T|F|G]|$D|U|E|V|F|G]|$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|H]]|9|@]|A|$]]|$1|I|3|J|5|6|7|12|8|@$D|13|E|14|F|G]|$D|15|E|16|F|G]|$D|17|E|18|F|G]|$D|19|E|1A|F|G]|$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|K|3|L|5|6|7|1D|8|@$D|1E|E|1F|F|G]|$D|1G|E|1H|F|G]|$D|1I|E|1J|F|G]|$D|1K|E|1L|F|H]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|N|$]]

Your approach is valid and will work as you want. However, I would like to a bit more information here. 

In your <code>ListCarsActivity</code>, on clicking the <code>floatingButton</code>, you are starting a new activity <code>AddCarActivity</code>. Once done, on clicking the button "Add Car", you can rather do your save/post logic and close (<code>finish()</code>) this (<code>AddCarActivity</code>). 

Doing this will prevent you from relaunching the same activity (<code>ListCarsActivity</code>) again. Also, If you close (<code>finish()</code>) the <code>ListCarsActivity</code> and if the user presses <code>back</code> from the <code>AddCarActivity</code>, the app will close (considering there are only two activities). This is definitely what you don't want.

Rather, you can implement <code>onResume</code> method in your <code>ListCarsActivity</code> to refresh the list with new and updated data. This same function will be called once the user clicks on "Add Car" and the <code>AddCarActivity</code> is closed. Hence, there would be no need to startActivity again.

blocks|key|589017|text|调用您的AddCarActivity.kt活动，如下所示在您的ListCarsActivity.kt中|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|589018|val+intent+=+Intent(mContext,+AddCarActivity.class);
startActivityForResult(intent,+1);+//Use+any+request+code|code-block|syntax|javascript|589019|现在，对于上面的代码，startActivityForResult所做的是打算从其他活动或源(如照相机、联系人等)接收数据。|589020|现在，当在您的AddCarActivity.kt中完成所有工作时，您可以使用下面的意图来获得结果|589021|++++++++++++++++Intent+intent+=+getIntent();
++++++++++++++++intent.putExtra("key",+data);+//+if+you+wanted+to+get+data+
++++++++++++++++setResult(RESULT_OK,+intent);
++++++++++++++++finish();|589022|在ListCarsActivity.kt中，您需要添加onActivityResult，这将从AddCarActivity.kt获取数据|589023|+@Override
protected+void+onActivityResult(int+requestCode,+int+resultCode,+Intent+data)+{
++++try+{
++++++++super.onActivityResult(requestCode,+resultCode,+data);

++++++++if+(resultCode+==+RESULT_OK)+{
++++++++++++if+(requestCode+==+1)+{+//Your+request+code+here
++++++++++++++++Object+obj+=+data.getParcelableExtra("key");
+++++++++++++++++//Do+as+per+your+needs

++++++++++++}
++++++++}

++++}+catch+(Exception+ex)+{
++++++++ex.printStackTrace();
++++}
}|589024|这样，如果您想在第一个活动中返回新添加的数据，则可以在不使用任何第三方库的情况下获取数据。|589025|试一试，让我知道它是否对你有用。|589026|entityMap^0|4|H|V|J|0|0|0|7|H|15|2|0|0|1|J|R|G|1B|H|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|15|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|O|3|P|5|H|7|1C|8|@]|D|@]|E|$I|J]]|$1|Q|3|R|5|6|7|1D|8|@$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@]|E|$]]|$1|S|3|T|5|H|7|1K|8|@]|D|@]|E|$I|J]]|$1|U|3|V|5|6|7|1L|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|1M|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|Z|$]]

Call your AddCarActivity.kt Activity like below inside your ListCarsActivity.kt

<pre><code>val intent = Intent(mContext, AddCarActivity.class);
startActivityForResult(intent, 1); //Use any request code
</code></pre>

Now for the above code what startActivityForResult do is that it is an intent to receive data back from some other activity or source(like camera, contacts, etc)

Now when all the work is done in your AddCarActivity.kt you can all the below intent to get the result back

<pre><code> Intent intent = getIntent();
 intent.putExtra("key", data); // if you wanted to get data 
 setResult(RESULT_OK, intent);
 finish();
</code></pre>

And inside your ListCarsActivity.kt you need to add onActivityResult which will get the data from AddCarActivity.kt

<pre><code> @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 try {
 super.onActivityResult(requestCode, resultCode, data);

 if (resultCode == RESULT_OK) {
 if (requestCode == 1) { //Your request code here
 Object obj = data.getParcelableExtra("key");
 //Do as per your needs

 }
 }

 } catch (Exception ex) {
 ex.printStackTrace();
 }
}
</code></pre>

With this, if you wanted to return the newly added data back in the first activity it can be fetched without the usage of any third-party libs.

Try it and do let me know if it worked for you.

blocks|key|593264|text|不要再次调用ListCarsActivity当用户添加汽车按钮只是放置finish()，因为您的第一个活动，您刚刚开始的活动ListCarsActivity.kt还没有完成，所以，它已经在堆栈中。如果您将再次调用ListCarsActivity.kt，那么在您的堆栈中，您的活动会打开两次。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|593265|entityMap^0|6|G|Z|8|1Q|J|2Y|J|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

Don't call <code>ListCarsActivity</code> again when user add the car button just put <code>finish()</code> Because your first activity, you've just started the activity <code>ListCarsActivity.kt</code> not the finished yet so, it's already in stack. If you will call again <code>ListCarsActivity.kt</code> then in your stack your activity opened two times.

I have the following simple scenario:

<ul>
<li>One Activity called ListCarsActivity.kt where list of cars are displayed. When the user click on the FloatingActionButton, it opens another activity called AddCarActivity.kt</li>
<li>When the user click on the Add Car button, I start a new intent to go to the initial activity ListCarsActivity.kt where the added car is now displayed.</li>
</ul>

Problem: From now, when I click on the Back button, the ListCarsActivity is displayed a second time.

How to clear the old entry of ListCarsActivity from the History stack?

<a href="https://i.stack.imgur.com/3yqk9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3yqk9.png" alt="enter image description here"></a>

Android: Clear old activity instance from history stack

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有以下简单的场景：ListCarsActivity.kt是一种名为的活动，用于显示汽车列表。当用户单击AddCarActivity.ktWhen时，它会打开另一个名为FloatingActionButton的活动--用户单击Add Car按钮，我将启动一个新的意图，转到最初的ActivityListCarsActiv...

问Android:从历史堆栈中清除旧的活动实例
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问Android:从历史堆栈中清除旧的活动实例EN