NOTES

Android related stuffs

Automated Debugging

• ADB (Android Debug Bridge)
  • main site — https://developer.android.com/tools/adb
  • standalone version — https://developer.android.com/studio/releases/platform-tools
• scrcpy (Android Screen Mirroring Tool) which runs on top of ADB.
  • website — scrcpy.org
  • repository — https://github.com/Genymobile/scrcpy/

You can run ADB over USB or WiFi, but WiFi is preferred because

• it frees up USB port for charging,
• no messy cables, and
• you can debug from VM.

1.   Prepare phone for WiFi debug.

1. Enable Developer options (normally hidden), by tapping Build number 7 times.
2. Disable Auto Blocker.
3. Enable Wireless debugging.

2.   Pair phone and desktop.

On Wireless debugging section, you’ll see

• Device name
• IP address & Port — eg. 192.168.1.25:22222

1. Tap Pair device with pairing code, and you get a popup with
   • Wi-Fi pairing code — eg. 123456
   • IP address & Port — eg. 192.168.1.25:44444
2. adb pair 192.168.1.25:44444
   • Enter the pairing code — eg. 123456.
3. adb connect 192.168.1.25:22222
   • Use the phone port, not the pairing port just used.
   • Phone should say “Currently connected”.
4. adb devices
   • The phone IP:port should be listed
5. scrcpy
   • You can type/click on desktop, and the phone will act on those inputs.
   • Screenshot for Samsung Galaxy A16

3.   Send keyboard/mouse input to phone.

You can send keyboard/mouse input to the phone using ADB, instead of manually typing and clicking.

1. To jump to Distrowatch website from the front page,

   adb shell input text KEYCODE_HOME          --- go to front page
   adb shell input tap 540 1120               --- tap Google Search
   adb shell input text "distrowatch.com"     --- type "distrowatch.com"
   adb shell input keyevent KEYCODE_ENTER     --- press <Enter>
   

2. There are other keycodes:
   • 3 buttons at the bottom (app list, home, back)

     KEYCODE_RECENT_APPS or KEYCODE_APP_SWITCH
     KEYCODE_HOME
     KEYCODE_BACK 
     

   • phone related

     KEYCODE_0 ... KEYCODE_9
     KEYCODE_STAR
     KEYCODE_POUND
     KEYCODE_CALL
     KEYCODE_ENDCALL
     

   • text entry

     KEYCODE_A ... KEYCODE_Z
     KEYCODE_AT
     KEYCODE_PERIOD
     KEYCODE_PLUS
     KEYCODE_MINUS
     KEYCODE_SLASH
     KEYCODE_SPACE
     KEYCODE_DEl
     KEYCODE_TAB
     KEYCODE_ENTER
     

4.   Determine X and Y positions.

1. Enable Pointer location.
   • X,Y positions of screen touch will be printed at the top of screen.
2. adb shell getevent -l
   • ABS_MT_POSITION_X — x position in hex
   • ABS_MT_POSITION_Y — y position in hex