How to resolve "Waiting for Debugger" message?

Some devices will only let the debugger attach if the application has the android.permission.SET_DEBUG_APP permission set in its manifest file:

<manifest>
  <uses-permission android:name="android.permission.SET_DEBUG_APP"></uses-permission>
</manifest> 

The Dialog Waiting for Debugger is shown if you are building a debug application or somewhere in your source code, you called Debug.waitingForDebugger();

Inside Android Studio 2.0 and above, there is an option of Attach Debugger to Android Process. It is the last menu item in the Run menu.

Not sure if this is what you are looking for, but try putting:

android:debuggable="true"

in the application tag in the AndroidManifest.xml