Android Installation failed with message...It is possible that this issue is resolved by uninstalli

1.今天一个朋友问我这样一个错误，信息和图如下：

Installation failed with message...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?

其实运行过程中遇到的错误(无法正常运行到手机或模拟器上)，一般就是手机权限设置问题和开发工具设置的问题了，下面来看看Studio中的设置，手机上的USB权限就不说了，你懂的：

2.解决方法：

1、打开菜单File——Settings——Build,Execution,Deployment——Instant Run
2、不选中Enable Instant Run to hot swap code/resource changes on deploy(default enabled)

3、依次点击Apply——OK，重新运行程序，大功告成

如果你没有成功，接下来使用第二招：
1、打开Edit Configurations...
2、在Install Flags中写上“-t”

3、依次点击Apply——OK，重新运行就可以了

一般情况下上面的两步就可以搞定的