On LineageOS how to zoom out with `adb`?
Feb 14, 4:37pm

On LineageOS (or any Android device), you can use ADB (Android Debug Bridge) to simulate a "zoom out" gesture, which is typically a pinch-out motion with two fingers. Here’s how you can do it:

Method 1: Simulate a Pinch-to-Zoom Gesture

You can use the input swipe command to simulate a two-finger pinch-out gesture. This is the most common way to zoom out programmatically.

Command:

bash
adb shell input swipe <x1> <y1> <x2> <y2> <duration_ms>  # First finger
adb shell input swipe <x3> <y3> <x4> <y4> <duration_ms>  # Second finger
  • Replace <x1> <y1> and <x2> <y2> with the starting and ending coordinates of the first finger.
  • Replace <x3> <y3> and <x4> <y4> with the starting and ending coordinates of the second finger.
  • The fingers should move away from each other to simulate a zoom-out.

Example:

To zoom out in the center of the screen (assuming a 1080x2340 resolution):

bash
adb shell input swipe 360 780 200 600 500  # First finger moves left
adb shell input swipe 720 780 960 600 500   # Second finger moves right
  • Adjust the coordinates and duration as needed for your screen size.

Method 2: Use input touchscreen (Android 11+)

If your device runs Android 11 or later, you can use the input touchscreen command for multi-touch gestures:

Command:

bash
adb shell input touchscreen swipe <x1> <y1> <x2> <y2> <duration_ms> <pressure> <finger_id>
  • Use two separate commands for each finger, with different finger_id values (e.g., 0 and 1).
  • Example: 
    bash
    adb shell input touchscreen swipe 360 780 200 600 500 100 0
adb shell input touchscreen swipe 720 780 960 600 500 100 1

Method 3: Use monkey for Random Inputs (Not Recommended)

You can use the monkey tool to send random pinch gestures, but this is less precise:

bash
adb shell monkey --throttle 500 --pct-pinchzoom 100 1
  • This is not reliable for controlled zooming.

Notes:

  • Screen Resolution: Adjust the coordinates based on your device’s screen resolution. Use adb shell wm size to check.
  • Permissions: Ensure USB debugging is enabled on your device and ADB is authorized.
  • Testing: Test in an app that supports pinch-to-zoom (e.g., Gallery, Maps, or Browser).
Feb 14, 4:37pm

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