I installed a package on Visual Studio Emulator for Android by drag-and-drop before. I got a new update yesterday. The emulator does not seem to support drag-and-drop anymore. Could anyone shed some light on this?
This can happen if you are running the emulator with elevated permissions. Try re-running without elevation (not as Administrator).
It's likely that the emulator is unable to connect to ADB. See this document: https://msdn.microsoft.com/en-us/library/mt228282.aspx#DragAndDrop for how to make sure ADB can connect to the emulator.
来源：https://stackoverflow.com/questions/32278613/does-visual-studio-emulator-for-android-still-support-drag-and-drop-package-inst