錯誤提示
運行app時彈出窗口提示:
installation failed with message null.
It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.
WARNING: Uninstalling will remove the application data!
Do you want to uninstall the existing application?
解決辦法：
把開發者選項裏面的“啓動MIUI優化”這個選項關掉就可以了
更多iOS、Android、Python、Java、MySQL的文章，請點擊：
http://blog.csdn.net/jamiecheung
更多Java、Unity3D的文章，請點擊：
http://blog.csdn.net/u010841622