blocks|key|201562|text|首先从仿真器中卸载应用程序：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|201563|adb+-e+uninstall+your.application.package.name|code-block|syntax|javascript|201564|然后再次尝试安装该应用程序。|201565|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|$]]

First uninstall your application from the emulator:

<pre><code>adb -e uninstall your.application.package.name
</code></pre>

Then try to install the application again.

blocks|key|419958|text|这发生在我的项目中，因为我使用XML资源来设置版本代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|419959|AndroidManifest.xml:
android:versionCode="@integer/app_version_code"

app.xml:
<integer+name="app_version_code">64</integer>|code-block|syntax|javascript|419960|这在以前的adb版本中不是问题，但是，从platform-tools+r16开始，它不再被解析为正确的整数。您可以使用adb+-r强制重新安装，也可以通过在清单中使用文字来完全避免此问题：|offset|length|style|CODE|419961|android:versionCode="64"|419962|entityMap^0|0|0|5|3|K|E|1N|6|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]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]|$I|V|J|W|K|L]|$I|X|J|Y|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

This was happening in my project because I was using an XML resource to set the version code.

<pre><code>AndroidManifest.xml:
android:versionCode="@integer/app_version_code"

app.xml:
&lt;integer name="app_version_code"&gt;64&lt;/integer&gt;
</code></pre>

This wasn't a problem in prior versions of <code>adb</code>, however, as of <code>platform-tools</code> r16 this is no longer being resolved to the proper integer. You can either force the re-install using <code>adb -r</code> or avoid the issue entirely by using a literal in the manifest:

<pre><code>android:versionCode="64"
</code></pre>

blocks|key|201630|text|当试图在Play商店中的已签名版本APK之上安装调试/未签名APK时，可能会发生这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|201631|H:\>adb+install+-r+"Signed.apk"
2909+KB/s+(220439+bytes+in+0.074s)
++++++++pkg:+/data/local/tmp/Signed.apk
Success

H:\>adb+install+-r+"AppName.apk"
2753+KB/s+(219954+bytes+in+0.078s)
++++++++pkg:+/data/local/tmp/AppName.apk
Failure+[INSTALL_FAILED_VERSION_DOWNGRADE]|code-block|syntax|javascript|201632|这个问题的解决方案是uninstall，然后从集成开发环境中重新安装或重新运行它。|offset|length|201633|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/13809095/588306^0|0|0|A|9|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]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

This can happen when trying to install a debug/unsigned APK on top of a signed release APK from the Play store.

<pre><code>H:\&gt;adb install -r "Signed.apk"
2909 KB/s (220439 bytes in 0.074s)
 pkg: /data/local/tmp/Signed.apk
Success

H:\&gt;adb install -r "AppName.apk"
2753 KB/s (219954 bytes in 0.078s)
 pkg: /data/local/tmp/AppName.apk
Failure [INSTALL_FAILED_VERSION_DOWNGRADE]
</code></pre>

The solution to this is to <a href="https://stackoverflow.com/a/13809095/588306">uninstall</a> and then reinstall or re run it from the IDE.

blocks|key|420015|text|您还可以考虑在adb+install中添加-d标志。它应该忽略这个错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|420016|adb+install+-r+-d+abc.apk|code-block|syntax|javascript|420017|entityMap^0|L|2|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|$]]

You can also consider adding <code>-d</code> flag to adb install. It should ignore this error.

<pre><code>adb install -r -d abc.apk
</code></pre>

blocks|key|420036|text|当我将Android+Studio应用程序导入eclipse时，就发生了这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|420037|当从android+studio项目导入时，我发现andoridmanifest.xml文件需要稍微修改一下。我创建了一个新的测试项目，并复制了标题以使其匹配。瞧，问题解决了。|420038|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|$]]

this happened to me when I imported an Android Studio App into eclipse.

I figured out the andoridmanifest.xml file needs to be slightly modified when importing from android studio project. I created a new test project, and copied over the headings to make it match. voila, issue solved.

blocks|key|201718|text|这个错误出现在我的android项目中，其中包含多种类型的gfx文件。最后，不接受清单文件中的任何更改。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|201719|由于我对android设备缺乏了解，我忘记了我的测试设备还有第二个用户。此用户还安装了我的应用程序版本，因此我还必须删除此用户帐户的应用程序，它的工作。|201720|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|$]]

This error appears in my android project with multiple kind of gfx files. At the end no change in the manifest file was accepted.

Because my lack of knowledge about the android devices I forget that my test device has a second User. This User also has an installed version of my app so I also have to delete the app for this user account and it works.

blocks|key|201778|text|根据...\android-22\android\content\pm\PackageManager.java的sdk+src代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|201779|/**
+*+Installation+return+code:+this+is+passed+to+the+{@link+IPackageInstallObserver}+by
+*+{@link+#installPackage(android.net.Uri,+IPackageInstallObserver,+int)}+if
+*+the+new+package+has+an+older+version+code+than+the+currently+installed+package.
+*+@hide
+*/
public+static+final+int+INSTALL_FAILED_VERSION_DOWNGRADE+=+-25;|code-block|syntax|javascript|201780|如果新程序包具有比当前安装的程序包更旧的版本代码。|201781|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|$]]

According to sdk src code from ...\android-22\android\content\pm\PackageManager.java

<pre><code>/**
 * Installation return code: this is passed to the {@link IPackageInstallObserver} by
 * {@link #installPackage(android.net.Uri, IPackageInstallObserver, int)} if
 * the new package has an older version code than the currently installed package.
 * @hide
 */
public static final int INSTALL_FAILED_VERSION_DOWNGRADE = -25;
</code></pre>

if the new package has an older version code than the currently installed package.

blocks|key|201832|text|在棉花糖中，我得到了这个错误，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|201833|Installation+error:+INSTALL_FAILED_PERMISSION_MODEL_DOWNGRADE
Please+check+logcat+output+for+more+details.
Launch+canceled!|code-block|syntax|javascript|201834|为了寻找解决方案，我搜索并来到了这里。我删除了这个应用程序，但在Nexus+6中仍然有这个问题。|201835|Settings+>+Apps+>+[My+app+name]+have+to+removed+for+all+user.+|201836|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|$]]

In Marshmallow, I got this error, 

<pre><code>Installation error: INSTALL_FAILED_PERMISSION_MODEL_DOWNGRADE
Please check logcat output for more details.
Launch canceled!
</code></pre>

Looking for solution I searched and came here. 
I deleted the app but still have this problem in Nexus 6. Later found that in, 

<pre><code>Settings &gt; Apps &gt; [My app name] have to removed for all user. 
</code></pre>

blocks|key|420188|text|你可以试试这个：adb+install+-r+-d+-f+your_Apk_path|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|420189|entityMap^0|8|Y|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

you can try this:
<code>adb install -r -d -f your_Apk_path</code>

blocks|key|201887|text|最让我痛苦的是，我不知道这个应用是为我的访客账号安装的(尽管我已经为其他账号卸载了它)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|201888|因此，我在应用程序管理器中搜索该应用程序，然后简单地单击所有用户的卸载|201889|​|201890|📷|atomic|offset|length|201891|201892|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d6fa9f3ed2344be1626e7f600a7741a0.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@$I|Y|J|Z|1|10]]|A|$]]|$1|K|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]]]

the thing that kept on killing me was that i didn't know that this app was installed for my guest account (although I had uninstalled it for the other accounts..)

so i searched for the app in the app manager, and simply clicked on uninstall for all users

<a href="https://i.stack.imgur.com/0QDUt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0QDUt.png" alt="enter image description here"></a>

blocks|key|201958|text|这可能是Google+Play服务依赖项的问题，而不是实际的应用程序版本问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|201959|有时，情况并非如此：|201960|a)已安装应用程序的现有版本，无论是否更新b)设备上的其他用户帐户上已安装应用程序的现有版本|201961|所以这个错误消息是假的。|201962|在我的例子中，我有：|201963|implementation+'com.google.android.gms:play-services-maps:16.0.0'
implementation+'com.google.android.gms:play-services-location:16.0.0'
implementation+'com.google.android.gms:play-services-gcm:16.0.0'|code-block|syntax|javascript|201964|但当我试着|201965|implementation+'com.google.android.gms:play-services-maps:17.0.0'
implementation+'com.google.android.gms:play-services-location:17.0.0'
implementation+'com.google.android.gms:play-services-gcm:17.0.0'|201966|我收到了与androidX相关的错误，因为我还没有升级到androidX，也没有准备好这样做。我发现使用最新的16.x.y版本可以工作，并且我不再收到错误消息。此外，我可以等到我准备好的时候，再升级到androidX。|201967|implementation+'com.google.android.gms:play-services-maps:16.%2B'
implementation+'com.google.android.gms:play-services-location:16.%2B'
implementation+'com.google.android.gms:play-services-gcm:16.%2B'|201968|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

It may be a problem with the Google Play Services dependencies rather than an actual app version issue.

Sometimes, it is NOT the case that:

a) there is an existing version of the app installed, newer or not
b) there is an existing version of the app installed on another user account on the device

So the error message is just bogus.

In my case, I had:

<pre><code>implementation 'com.google.android.gms:play-services-maps:16.0.0'
implementation 'com.google.android.gms:play-services-location:16.0.0'
implementation 'com.google.android.gms:play-services-gcm:16.0.0'
</code></pre>

But when I tried

<pre><code>implementation 'com.google.android.gms:play-services-maps:17.0.0'
implementation 'com.google.android.gms:play-services-location:17.0.0'
implementation 'com.google.android.gms:play-services-gcm:17.0.0'
</code></pre>

I got androidX related errors, as I had not yet upgraded to androidX and was not ready to do so. I found that using the latest 16.x.y versions work and I don't get the error message any more. Furthermore, I could wait till later when I am ready, to upgrade to androidX.

<pre><code>implementation 'com.google.android.gms:play-services-maps:16.+'
implementation 'com.google.android.gms:play-services-location:16.+'
implementation 'com.google.android.gms:play-services-gcm:16.+'
</code></pre>

blocks|key|420343|text|我也有同样的问题。我随一起安装的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|420344|++++adb+shell+pm+install+--user+<userId>+test.apk|code-block|syntax|javascript|420345|由于某种原因，屏幕上没有图标。这是一个调试版本，所有其他连续安装都不起作用。只需卸载此包就会有所帮助。|420346|+++++adb+uninstall+com.package.name|420347|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|$]]

I was having the same problem. I installed with
<pre><code> adb shell pm install --user &lt;userId&gt; test.apk
</code></pre>
For some reason, there was no icon on the screen. It was a debug build and all other consecutive installs were not working. Simply uninstalling the package helped.
<pre><code> adb uninstall com.package.name
</code></pre>

I am currently trying to compile and test a small Android Application.

I am using Eclipse, and have SDK 4.2 (Api Level 17) installed. 
I've set 

<pre><code>&lt;uses-sdk android:targetSdkVersion="17" android:minSdkVersion="8" /&gt;
</code></pre>

although I've tried also different values (i.e. 17/17).

I do not use any GoogleAPI functions, nor do I use functions that are not available in API Level 8. Or at least I do not get any compile errors or warnings in that regard.

When I compile the project and run it on a real device running Android 2.2.1 the Application runs fine. However when I try to run the application on an emulator (Android Virtual Device) with Android 4.2, Api Level 17 I get the following error:

<pre><code>[2012-12-10 21:10:29 - SoftKeyboard] Installation error: INSTALL_FAILED_VERSION_DOWNGRADE
[2012-12-10 21:10:29 - SoftKeyboard] Please check logcat output for more details.
[2012-12-10 21:10:29 - SoftKeyboard] Launch canceled!
</code></pre>

Logcat however is empty. I have really no clue, what this error even means...

Android Emulator: Installation error: INSTALL_FAILED_VERSION_DOWNGRADE

我目前正在尝试编译和测试一个小的Android应用程序。我正在使用Eclipse，并且安装了SDK 4.2 (Api Level 17)。我设置好了<uses-sdk android:targetSdkVersion="17" android:minSdkVersion="8" />虽然我也尝试了不同的值(例如17/1...

问安卓模拟器:安装错误: INSTALL_FAILED_VERSION_DOWNGRADE
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