Error running app: Instant Run requires 'Tools | Android | Enable ADB integration' to be enabled.

23:20:29 Error running app: Instant Run requires 'Tools | Android | Enable ADB integration' to be enabled.

23:20:45 Error running app: Instant Run requires 'Tools | Android | Enable ADB integration' to be enabled.

23:22:52 Could not open Selected VM debug port (8700). Make sure you do not have another instance of DDMS or of the eclipse plugin running. If it's being used by something else, choose a new port number in the preferences.
23:22:58 Executing tasks: [:app:clean, :app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:mockableAndroidJar, :app:prepareDebugUnitTestDependencies, :app:assembleDebug]

解决方法：在菜单栏，Tools->Android->Enable ADB integration勾选就可以了。