blocks|key|4703661|text|签名的APK文件和未签名的APK文件是有区别的。很可能你之前在那里有一个未签到的。在安装签名版本之前，您只需要删除未签名的。具体实现方式因具体版本而异，但通常情况下，请在模拟器上转到设置->应用程序，长时间单击您的应用程序，然后删除/移除/卸载它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4703662|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|$]]

There is a difference between signed and unsigned APK files. Most likely you had an unsigned on there previously. You just need to delete the unsigned before you install the signed version. How this can be accomplished varies on the exact version, but in general, go on the emulator to settings-> application, long click your app, and delete/remove/uninstall it.

blocks|key|4703726|text|问题在于用于签署APK的密钥，默认情况下，如果您直接从IDE运行并打开Emulator，则Emulator中安装的APK将使用您的调试密钥(通常安装在~/.android/debug.keystore中)进行签名，因此，如果以前的APK使用与您当前使用的密钥不同的密钥进行签名，您将始终获得签名冲突，为了解决此问题，请确保您使用完全相同的密钥对两个APK进行签名，即使以前的APK是使用来自另一个SDK的调试密钥进行签名的，密钥也肯定会不同。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4703727|此外，如果你不知道之前使用了什么密钥来签署apk，但你想要安装新版本的应用程序，你可以只卸载以前的应用程序，然后重新安装新的应用程序。|4703728|希望这能帮到你。|4703729|致以问候！|4703730|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

The problem is the keys that have been used to sign the APKs, by default if you are running directly from your IDE and opening your Emulator, the APK installed in the Emulator is signed with your debug-key(usually installed in ~/.android/debug.keystore), so if the previous APK was signed with a different key other than the one you are currently using you will always get the signatures conflict, in order to fix it, make sure you are using the very same key to sign both APKs, even if the previous APK was signed with a debug-key from another SDK, the keys will definitely be different.

Also if you don't know exactly what key was used before to sign the apk and yet you want to install the new version of your app, you can just uninstall the previous application and reinstall the new one.

Hope this Helps...

Regards!

blocks|key|197830|text|我收到了相同的错误消息，但这些答案没有帮助。在4.3nexus7上，我使用的用户不是所有者。我已经卸载了旧版本，但我一直收到相同的信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|197831|解决方案:我必须以所有者身份登录，进入“设置”“->应用程序”，然后刷到“全部”选项卡。向下滚动到列表的最末尾，其中列出了旧版本，并标记为“未安装”。选择它并按下右上角的'settings‘按钮，最后'uninstall+for+all+users’|197832|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had the same error message, but these answers did not help. On a 4.3 nexus 7, I was using a user who was NOT the owner. I had uninstalled the older version but I kept getting the same message.

Solution: I had to login as the owner and go to Settings -> Apps, then swipe to the All tab. Scroll down to the very end of the list where the old versions are listed with a mark 'not installed'. Select it and press the 'settings' button in the top right corner and finally 'uninstall for all users'

blocks|key|4703892|text|我有一个问题，调试和发布版本都不能安装在我用来调试的设备上。当尝试安装新版本时，会出现相同的消息。唯一的解决方法是卸载当前版本并安装新版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4703893|看起来Android+studio标记了它安装的apk，所以使用包管理器的安装将区分安装用于调试的版本和从Google+play或其他外部来源下载的版本(这在我使用eclipse时从未发生过)。|4703894|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I had an issue where both debug and release build won't install on devices I used for debugging. The same msg would appear when trying to install the new version. The only workaround was to uninstall the current version and install the new one.

It looks like Android studio marks the apk it installs so that installation using the package managers would distinguish between version installed for debugging and versions downloaded from Google play or other external sources (this never happened to me when using eclipse).

blocks|key|4703942|text|如果您在android上使用多个用户，请验证是否到处都卸载了该应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4703943|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 use multiple users at android, verify that the app is uninstalled everywhere.

blocks|key|4703983|text|如果使用的是debug+apk，则用于对其进行签名的密钥在|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4703984|C:\Users\<user>\.android\debug.keystore|code-block|syntax|javascript|4703985|如果您使用相同密钥，则在安装时应该不会发生冲突。|4703986|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|$]]

If you are using the debug apk, the key that is used to sign it is in 

<pre><code>C:\Users\&lt;user&gt;\.android\debug.keystore
</code></pre>

If you use that same key, there should not be a conflict when installing.

blocks|key|198045|text|可能是应用程序卸载不成功。如果您的设备是这种情况，您可以尝试此方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|198046|首先获取应用程序的包名，例如'com.xxx.app'，您可以使用根资源管理器从Manifest文件中找到它(RE可以解码该文件)。然后，您可以使用此脚本将其卸载：|198047|adb+shell+pm+uninstall+com.xxx.app+//+replace+to+package+name+that+you+want+to+remove|code-block|syntax|javascript|198048|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

It may be application is not uninstall successful. If your device is this case, you can try this method. 

First get the package name of the application, e.g 'com.xxx.app', you can use Root Explorer and find it from Manifest file(RE can decode the file). then you can use this script to uninstall it:

<pre><code>adb shell pm uninstall com.xxx.app // replace to package name that you want to remove
</code></pre>

blocks|key|4704068|text|当您在AndroidManifiest中更改/添加/删除shareId时，您的应用程序不会更新，这可能还有另一个原因。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4704069|"android:sharedUserId“|4704070|也请检查一下。|4704071|为了防止这种情况的发生，我建议在你的应用程序中使用sharedUserId，不管你当前的需求是什么。|4704072|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

There may be another reason when your application will not update when you either change/add/remove shareId in AndroidManifiest.

"android:sharedUserId"

Please check that also. 

To prevent would recommend to use sharedUserId in your application despite in your current requirement you need or now.

blocks|key|198132|text|如果您不想为keystore文件而烦恼，那么只需为所有用户完全删除包即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|198133|将您的设备连接到Mac/PC并运行adb+uninstall+<package>|offset|length|style|CODE|198134|对我很管用。|198135|参考：https://android.stackexchange.com/questions/92025/how-to-completely-uninstall-an-app-on-android-lollipop|198136|entityMap|0|LINK|mutability|MUTABLE|url|https://android.stackexchange.com/questions/92025/how-to-completely-uninstall-an-app-on-android-lollipop^0|0|H|N|0|0|3|2W|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Y|8|@]|9|@$D|Z|E|10|1|11]]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

If you don't want to bother with the keystore file, then just remove the package altogether for all users.

Connect your device with Mac/PC and run <code>adb uninstall &lt;package&gt;</code>

Worked for me.

Ref: <a href="https://android.stackexchange.com/questions/92025/how-to-completely-uninstall-an-app-on-android-lollipop">https://android.stackexchange.com/questions/92025/how-to-completely-uninstall-an-app-on-android-lollipop</a>

blocks|key|4704171|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4704172|📷|atomic|offset|length|4704173|我必须以所有者身份登录，进入“设置”“->应用程序”，然后刷到“全部”选项卡。向下滚动到列表的最末尾，其中列出了旧版本，并标记为“未安装”。选择它并按下右上角的'settings‘按钮，最后'uninstall+for+all+users’|4704174|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d3a00fa9099543b993b720038acfddc5.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

<a href="https://i.stack.imgur.com/9AWtk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/9AWtk.png" alt="enter image description here"></a>I had to login as the owner and go to Settings -> Apps, then swipe to the All tab. Scroll down to the very end of the list where the old versions are listed with a mark 'not installed'. Select it and press the 'settings' button in the top right corner and finally 'uninstall for all users'

blocks|key|198267|text|如果上面的解决方案对您无效，那么您可能需要执行以下操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|198268|1)从Appstore安装app。|198269|2)使用相同包名的sign+APK更新更新版本。|198270|所以基本上有两种如果是APK。|198271|1)你上传到playstore称为原创APK。|198272|2)从playstore下载，称为派生APK。|198273|在这种情况下，基本上你是下载派生的APK并用原始的apk更新它。|198274|为了让它正常工作，在Google+Play+Store上以内部测试模式上传新的签名发布的APK，并下载派生的APK以检查更新方案。|198275|​|198276|📷|atomic|offset|length|198277|198278|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/0942b35f302aef0f3b5ee4852e207193.png|imageAlt^0|0|0|0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|19|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|1A|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1B|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1C|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1D|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1E|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|1F|8|@]|9|@$U|1G|V|1H|1|1I]]|A|$]]|$1|W|3|Q|5|6|7|1J|8|@]|9|@]|A|$]]|$1|X|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|Y|$Z|$5|10|11|12|A|$13|14|15|-4]]]]

If above solutions did not work for you then you may have doing something as following ..

1) installing the app from Appstore. 
2) updating it with sign APK with same package name updated version. 

So basically there are two kinds if APK's.

1) you uploaded on playstore known as original APK. 
2) download from playstore known as derived APK.

In this case basically you are downloading derived apk and updating it with original APK.

For let it work fine uploaded new signed released APK in the internal test mode on the Google Play Store and download the derived APK to check the update scenario. 

<a href="https://i.stack.imgur.com/3o9Wp.png" rel="noreferrer"><img src="https://i.stack.imgur.com/3o9Wp.png" alt="enter image description here"></a>

blocks|key|198295|text|我尝试了以上所有的方法，但都不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|198296|我发现，尽管卸载了应用程序，但新版本的应用程序仍然会出现相同的错误。|198297|解决方法是:转到设置->通用->应用程序管理器->选择您的应用程序->单击顶部的三个圆点为所有用户卸载->|198298|一旦你这样做，现在它实际上是卸载的，现在将允许您的新版本安装。|198299|希望这能有所帮助。|198300|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I tried all the above and it did not work.

I found that in spite of uninstalling the app a new version of the app still gives the same error.

This is what solved it:
go to Settings -> General -> application Manager -> choose your app -> click on the three dots on the top -> uninstall for all users 

Once you do this, now it is actually uninstalled and will now allow your new version to install.

Hope this helps.

blocks|key|4704354|text|我只是选择了Gradle+Bar中的uninstallAll。这对我很管用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4704355|​|4704356|📷|atomic|offset|length|4704357|4704358|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/f2411d0932cbb0c2073bd2588ee06d80.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

I just choose uninstallAll in Gradle Bar. It worked for me.
<a href="https://i.stack.imgur.com/ok7BK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ok7BK.png" alt="enter image description here" /></a>

In my emulator, when I try to do an upgrade of my apk programmatically. I get:

<code>Android App Not Install.</code>

<code>An existing package by the same name with a conflicting signature is already installed</code>

<img src="https://i.stack.imgur.com/tjUz8.jpg" alt="enter image description here">

I'm still in the testing phase of this upgrade, so the file I download is a signed apk of a previous version, which I think should work without any issues. 

From the suggestion in: <a href="https://stackoverflow.com/questions/19045353/an-existing-package-by-the-same-name-with-a-confilcting-signature-is-already-ins">an existing package by the same name with a confilcting signature is already installed</a> I tried to run the emulator both in debug mode and in normal mode... neither worked. 

Any thoughts on what I'm missing?

Android App Not Install. An existing package by the same name with a conflicting signature is already installed

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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在我的模拟器中，当我尝试以编程方式升级我的apk时。我得到了：Android App Not Install.An existing package by the same name with a conflicting signature is already installed​​我仍然处于这次升级的测试阶段，所以...

问未安装Android应用程序。已安装具有冲突签名的同名现有软件包
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问未安装Android应用程序。已安装具有冲突签名的同名现有软件包EN