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Tools

Run android layout --help and android screen --help.

UI Dump

android layout returns a flat JSON list of the UI elements on screen. android layout --diff returns a flat JSON list of the UI elements that have changed since the last call to layout or layout --diff

Each JSON object represents a UI element in the Android app. The following properties may be present:

text - any literal text the element contains
resourceId - the Android resource id used to refer to the element
contentDesc - a description of a UI element for use by accessibility tools
interactions - the set of user interactions the element supports. May contain one or more of: checkable, clickable, focusable, scrollable, long-clickable, password
state - the set of states the element is in. May contain one or more of checked, focused, selected
bounds - the screen coordinates of the bounding rectangle of the element, in the format [min X,min Y][max X, max Y]
center - the screen coordinates of the center of the element, in the format [x,y]
off-screen - if true, the element is in the UI hierarchy but not visible; it may require scrolling to view.

Use layout as a primary means of examining an Android app. Use layout --diff to focus on changes and to keep your context small. Example: When entering digits into a calculator, use layout --diff to output only the digit readout element.

layout may fail due to the app displaying a WebView or animation; in these cases, use android screen --annotate to inspect the app. This failure will likely resolve after navigating away from the current screen.

Screenshot

android screen capture -o <file path> saves a PNG of the current device screen to <file path>

Use screen capture as a secondary means of examining an Android app Examples:

Understanding the content of an on-screen image
Looking at a WebView (web content does not always appear in the ui dump)
Trying to find a UI element by its visual appearance

IMPORTANT: Always VISUALLY examine the PNG image returned from android screen BEFORE doing anything else.

Annotated Screenshot

android screen capture --annotate -o <file path> android screen resolve --screen <path> --string <string>

The --annotate command adds numerical labels and bounding boxes around UI elements. Use this command to locate UI elements that cannot be located in the layout output.

IMPORTANT: When using android –-annotate, always VISUALLY examine the resulting PNG file.

To refer to these labels in input commands, use screen resolve to convert labels into coordinates:

android screen resolve --screen <file path> --string "#3" returns <x coord of region 3> <y coord of region 3>

To save turns, you can combine shell commands:

adb shell input $(android screen resolve --screen screen.png --string "tap #34")

This command taps on region #34 from screen.png

Input

Use adb shell input for interacting with Android devices. Refer to the "interactions" property of an element for what interactions can be performed on a particular element.

Interact with UI elements with their center coordinate or their bounds coordinates:

{
  "key": -248568265,
  "class": "android.widget.Button",
  "bounds": "[138,9][167,38]",
  "center": "[152,23]"
}

To tap on this button, you would execute adb shell input tap 152 23. This taps the center.

{
  "key": 12487234,
  "class": "com.example.ui.ScrollableList",
  "bounds": "[100,200][400,600]",
  "center": "[250,400]"
}

To scroll down on this list, you would execute adb shell input swipe 250 400 250 200 500. This swipes from the center to the top over 500ms.

Android Interaction Rules

Always ensure text input fields have "focused" in their "state" list before entering text
If an element has "scrollable" in its "interactions" list, try scrolling it when looking for missing UI elements
Always scroll slowly when executing scroll inputs. In adb shell input swipe <x1> <y1> <x2> <y2> [duration(ms)], the duration is the optional 5th parameter after swipe (the 6th argument to the input utility).
Content may take time to load; if a layout is missing information after you take an action, wait a few seconds, then perform layout --diff to see if anything changes.

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