我们在安装新的 APk 的时候。会出现

Installation error: INSTALL_FAILED_VERSION_DOWNGRADE

原因：  是由于 androidversionCode 的原因，我们手机里面的APP 的 versionCode 高于将要安装的 APP!

error:

<span style="font-size:18px;">[2015-03-17 16:52:21 - HoleYourBrain] Android Launch!

[2015-03-17 16:52:21 - HoleYourBrain] adb is running normally.

[2015-03-17 16:52:21 - HoleYourBrain] Performing com.youxiputao.SplashActivity activity launch

[2015-03-17 16:52:23 - HoleYourBrain] Uploading HoleYourBrain.apk onto device '71MBBL324VFG'

[2015-03-17 16:52:24 - HoleYourBrain] Installing HoleYourBrain.apk...

[2015-03-17 16:52:25 - HoleYourBrain] Installation error: INSTALL_FAILED_VERSION_DOWNGRADE

[2015-03-17 16:52:25 - HoleYourBrain] Please check logcat output for more details.

[2015-03-17 16:52:25 - HoleYourBrain] Launch canceled!</span>

解决方式：

在清单文件改动

android:versionCode="1081"