Screenshot

# Capture screenshot
adb exec-out screencap -p > android-screen.png

# With device selection
adb -s emulator-5554 exec-out screencap -p > screen.png

Screen Recording

# Start recording (max 3 minutes)
adb shell screenrecord /sdcard/recording.mp4

# Stop with Ctrl+C, then pull file
adb pull /sdcard/recording.mp4 ./recording.mp4

Emulator Commands

Launch Emulator

# List available AVDs
emulator -list-avds

# Launch specific AVD
emulator -avd Pixel_7_API_34 &

Quick Boot

# Cold boot (fresh start)
emulator -avd Pixel_7_API_34 -no-snapshot-load

# Quick boot (resume state)
emulator -avd Pixel_7_API_34

Automated QA Flow

Multi-Device Testing

#!/bin/bash
# qa-android-devices.sh

devices=("Pixel_4_API_34" "Pixel_7_API_34" "Pixel_Tablet_API_34")

for device in "${devices[@]}"; do
  echo "Testing on $device..."

  # Launch emulator
  emulator -avd "$device" -no-window &
  sleep 30  # Wait for boot

  # Install app
  adb install -r app/build/outputs/apk/debug/app-debug.apk

  # Launch app
  adb shell am start -n com.example.app/.MainActivity

  sleep 3

  # Screenshot
  adb exec-out screencap -p > "qa-${device}.png"

  # Kill emulator
  adb emu kill
done

echo "Screenshots ready for review!"

Dark Theme Toggle

# Enable dark theme
adb shell "cmd uimode night yes"
sleep 2
adb exec-out screencap -p > dark-mode.png

# Enable light theme
adb shell "cmd uimode night no"
sleep 2
adb exec-out screencap -p > light-mode.png

Font Scale Testing

# Large font
adb shell settings put system font_scale 1.3
sleep 2
adb exec-out screencap -p > large-font.png

# Default
adb shell settings put system font_scale 1.0

Deep Linking

# Open specific activity via intent
adb shell am start -a android.intent.action.VIEW \
  -d "myapp://settings" com.example.app
sleep 2
adb exec-out screencap -p > settings.png

App Interaction

Tap/Click

# Tap at coordinates (x, y)
adb shell input tap 540 1200

Swipe

# Swipe down (scroll)
adb shell input swipe 540 1000 540 200 300

Text Input

adb shell input text "Hello%sWorld"  # %s = space

Common Checks for Claude Vision

Integration with Claude

Drag screenshots into Claude and ask:

"Is this following Material Design guidelines?"
"Check for Android-specific UI issues"
"Compare phone vs tablet layout"

Use when: Android visual testing, emulator automation, multi-device QA

Android Emulator QA

Android Emulator QA Expert

For Vibe Coders

ADB Basics

Device Connection