問題描述
我目前正在嘗試編譯和測試一個小型 Android 應用程序.
我正在使用 Eclipse，并安裝了 SDK 4.2(Api 級別 17).我已經設置了
雖然我也嘗試過不同的值(即 17/17).
我不使用任何 GoogleAPI 函數，也不使用 API 級別 8 中不可用的函數.或者至少在這方面我沒有收到任何編譯錯誤或警告.
當我編譯項目并在運行 Android 2.2.1 的真實設備上運行它時，應用程序運行良好.但是，當我嘗試在具有 Android 4.2、Api Level 17 的模擬器(Android 虛擬設備)上運行應用程序時，出現以下錯誤:
[2012-12-10 21:10:29 - SoftKeyboard] 安裝錯誤:INSTALL_FAILED_VERSION_DOWNGRADE[2012-12-10 21:10:29 - SoftKeyboard] 請檢查 logcat 輸出以獲取更多詳細信息.[2012-12-10 21:10:29 - SoftKeyboard] 發布取消！然而，Logcat 是空的.我真的不知道，這個錯誤甚至意味著什么......
這意味著您正在嘗試安裝一個與已安裝在模擬器上的應用程序具有相同 packageName 的應用程序，但您正在嘗試安裝的應用程序具有較低的 versionCode(您的版本號的整數值).
您可能已經從版本號高于您現在正在使用的副本的代碼的單獨副本安裝.無論哪種情況，都可以:
卸載當前安裝的副本
或打開手機的設置>應用程序管理器來確定已安裝應用程序的版本號，并在AndroidManifest中增加你的
. 或https://stackoverflow.com/a/13772620/632951
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
<uses-sdk android:targetSdkVersion="17" android:minSdkVersion="8" />
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:
[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!
Logcat however is empty. I have really no clue, what this error even means...
It means you're trying to install an app with the same packageName as an app that's already installed on the emulator, but the one you're trying to install has a lower versionCode (integer value for your version number).
You might have installed from a separate copy of the code where the version number was higher than the copy you're working with right now. In either case, either:
uninstall the currently installed copy
or open up your phone's Settings > Application Manager to determine the version number for the installed app, and increment your
<manifest android:versionCodeto be higher in the AndroidManifest.or https://stackoverflow.com/a/13772620/632951
這篇關于Android 模擬器:安裝錯誤:INSTALL_FAILED_VERSION_DOWNGRADE的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！