Debug android app without using a usb cable.
You need to connect your device to your computer via USB cable. Make sure USB debugging is working. You can check if it shows up when running adb devices
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FWIW: I didn't produce the content presented here (the outline from Edmond Lau's book). I've just copy-pasted it from somewhere over the Internet, but I cannot remember what exactly the original source is. I was also not able to find the author's name, so I cannot give him/her the proper credits.