launch-on-device

name	launch-on-device
description	Build, install, and launch the Zhihu++ Android app on a connected device using ADB. Includes comprehensive troubleshooting for common issues like missing devices, installation failures, signature mismatches, and app crashes. Use when deploying debug builds to physical devices or emulators.
license	CC BY-NC-SA 4.0

Launch on Device Skill

Overview

This skill documents how to build, install, and launch the Zhihu++ Android app on a connected device using ADB (Android Debug Bridge).

Prerequisites

• ADB installed and available in PATH
• Android device connected via USB or wireless ADB
• USB debugging enabled on device
• Project built successfully

Quick Start

# 1. Build the lite debug APK
./gradlew assembleLiteDebug

# 2. Install and launch on device
adb install -r ./app/build/outputs/apk/lite/debug/app-lite-debug.apk
adb shell am start -n com.github.zly2006.zhplus.lite/com.github.zly2006.zhihu.MainActivity

Detailed Workflow

Step 1: Check ADB Connection

# Check if adb is available
which adb

# Check adb version
adb --version

# List connected devices
adb devices

Expected output:

List of devices attached
<device-id>    device

Step 2: Build the APK

cd /path/to/Zhihu
./gradlew assembleLiteDebug --quiet

The APK will be generated at: ./app/build/outputs/apk/lite/debug/app-lite-debug.apk

Step 3: Install APK to Device

# Install with -r flag to replace existing installation
adb install -r ./app/build/outputs/apk/lite/debug/app-lite-debug.apk

Expected output: Success

Step 4: Launch the App

# Launch the main activity
adb shell am start -n com.github.zly2006.zhplus.lite/com.github.zly2006.zhihu.MainActivity

Expected output: Starting: Intent { cmp=com.github.zly2006.zhplus.lite/com.github.zly2006.zhihu.MainActivity }

Login JSON Backup and Restore

When Android or JVM verification is blocked by repeated login, first try restoring the saved account JSON instead of logging in again.

Account JSON Handling Policy

Account JSON is runtime state, not a Gradle input. Do not add Gradle tasks, generated source sets, androidTest assets, or any other build-script wiring that copies .secret/account.json or another account JSON into the app or test APK.

Agents must restore account JSON manually before UI checks or real-data instrumented tests. Use adb push plus run-as to copy the chosen backup into the target app sandbox as files/account.json, then launch or run instrumentation.

Backup After a Successful Android Login

mkdir -p ~/.zhihu-plus-plus/backups
adb exec-out run-as com.github.zly2006.zhplus.lite cat files/account.json \
  > ~/.zhihu-plus-plus/backups/android-lite-account-$(date +%Y%m%d-%H%M%S).json
python3 - <<'PY'
import json, pathlib
p = max(pathlib.Path.home().joinpath(".zhihu-plus-plus/backups").glob("android-lite-account-*.json"))
data = json.loads(p.read_text())
print("valid_json=true")
print("login=", data.get("login"))
print("has_z_c0=", "z_c0" in data.get("cookies", {}))
print("has_d_c0=", "d_c0" in data.get("cookies", {}))
PY

Do not print cookie values. Only verify that the JSON parses and contains the required keys.

Restore Android Login State

BACKUP=~/.zhihu-plus-plus/backups/android-lite-account-YYYYMMDD-HHMMSS.json
adb push "$BACKUP" /data/local/tmp/zhihu-account.json
adb shell run-as com.github.zly2006.zhplus.lite sh -c 'cp /data/local/tmp/zhihu-account.json files/account.json && chmod 600 files/account.json'
adb shell am force-stop com.github.zly2006.zhplus.lite
adb shell monkey -p com.github.zly2006.zhplus.lite -c android.intent.category.LAUNCHER 1

If the only available source is the project-local secret file, copy it manually in the same way:

BACKUP=.secret/account.json
adb push "$BACKUP" /data/local/tmp/zhihu-account.json
adb shell run-as com.github.zly2006.zhplus.lite sh -c 'cp /data/local/tmp/zhihu-account.json files/account.json && chmod 600 files/account.json'

For real-data instrumented tests, restore files/account.json first, then pass zhpp_data_mode=real:

adb shell am instrument -w \
  -e zhpp_data_mode real \
  com.github.zly2006.zhplus.lite.test/com.github.zly2006.zhihu.ZhihuInstrumentedTestRunner

Reuse Android Login for JVM/Desktop

The JVM desktop account store is ~/.zhihu-plus-plus/account.json. If the desktop app keeps asking for QR login while Android is already logged in, back up the old desktop file and copy the latest Android backup over it:

cp ~/.zhihu-plus-plus/account.json ~/.zhihu-plus-plus/backups/desktop-account-before-android-sync-$(date +%Y%m%d-%H%M%S).json 2>/dev/null || true
cp ~/.zhihu-plus-plus/backups/android-lite-account-YYYYMMDD-HHMMSS.json ~/.zhihu-plus-plus/account.json

If a fresh JVM QR login is still necessary, notify the user before waiting:

terminal-notifier -message "需要扫码登录 JVM 端" -sound default

App Variants

The project has two build variants:

1. Lite Version (recommended for development)

   • Package: com.github.zly2006.zhplus.lite
   • APK: ./app/build/outputs/apk/lite/debug/app-lite-debug.apk
   • Main Activity: com.github.zly2006.zhihu.MainActivity

2. Full Version

   • Package: com.github.zly2006.zhplus
   • APK: ./app/build/outputs/apk/full/debug/app-full-debug.apk
   • Main Activity: com.github.zly2006.zhihu.MainActivity

Common Issues and Solutions

Issue 1: ADB Server Not Running

Symptom:

error: could not connect to daemon

Solution:

# Kill and restart adb server
adb kill-server
adb start-server
adb devices

Issue 2: No Devices Connected

Symptom:

List of devices attached
(empty list)

Solutions:

a) USB Connection Issues:

# Check USB cable and connection
# Replug the device
# Check device is in USB debugging mode
# Accept USB debugging prompt on device

b) Unauthorized Device:

# Check device screen for authorization dialog
# Accept "Allow USB debugging" prompt
# Check again
adb devices

c) Wireless ADB Connection:

# If using wireless ADB, reconnect
adb connect <device-ip>:5555

Issue 3: APK Not Found

Symptom:

adb: failed to stat ./app/build/outputs/apk/lite/debug/app-lite-debug.apk: No such file or directory

Solution:

# Build the APK first
./gradlew assembleLiteDebug

# Verify APK exists
ls -lh ./app/build/outputs/apk/lite/debug/app-lite-debug.apk

# If still not found, clean and rebuild
./gradlew clean assembleLiteDebug

Issue 4: Installation Failed (INSTALL_FAILED_UPDATE_INCOMPATIBLE)

Symptom:

Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE: Existing package com.github.zly2006.zhplus.lite signatures do not match newer version]

Solution:

# Uninstall existing app first
adb uninstall com.github.zly2006.zhplus.lite

# Then install again
adb install ./app/build/outputs/apk/lite/debug/app-lite-debug.apk

Issue 5: Installation Failed (Insufficient Storage)

Symptom:

Failure [INSTALL_FAILED_INSUFFICIENT_STORAGE]

Solution:

# Check device storage
adb shell df -h

# Free up space on device or uninstall unused apps
adb shell pm list packages | grep -i <package-pattern>
adb uninstall <package-name>

Issue 6: Multiple Devices Connected

Symptom:

error: more than one device/emulator

Solution:

# List devices to get device ID
adb devices

# Use -s flag to specify target device
adb -s <device-id> install -r ./app/build/outputs/apk/lite/debug/app-lite-debug.apk
adb -s <device-id> shell am start -n com.github.zly2006.zhplus.lite/com.github.zly2006.zhihu.MainActivity

Issue 7: App Crashes on Launch

Symptom: App installs but crashes immediately after launch.

Solution:

# Check logcat for crash details
adb logcat | grep -i "AndroidRuntime\|FATAL\|zhplus"

# Or filter by app package
adb logcat --pid=$(adb shell pidof -s com.github.zly2006.zhplus.lite)

# Clear app data and try again
adb shell pm clear com.github.zly2006.zhplus.lite
adb shell am start -n com.github.zly2006.zhplus.lite/com.github.zly2006.zhihu.MainActivity

Issue 8: Activity Not Found

Symptom:

Error: Activity class {...} does not exist.

Solution:

# Verify package is installed
adb shell pm list packages | grep zhplus

# Check main activity from manifest
adb shell dumpsys package com.github.zly2006.zhplus.lite | grep -A 1 "android.intent.action.MAIN:"

# Use correct activity name
adb shell am start -n com.github.zly2006.zhplus.lite/com.github.zly2006.zhihu.MainActivity

Useful ADB Commands

App Management

# List installed packages
adb shell pm list packages | grep zhplus

# Get app installation path
adb shell pm path com.github.zly2006.zhplus.lite

# Clear app data
adb shell pm clear com.github.zly2006.zhplus.lite

# Uninstall app
adb uninstall com.github.zly2006.zhplus.lite

# Force stop app
adb shell am force-stop com.github.zly2006.zhplus.lite

# Get app info
adb shell dumpsys package com.github.zly2006.zhplus.lite

Device Information

# Get device properties
adb shell getprop ro.build.version.release  # Android version
adb shell getprop ro.product.model          # Device model
adb shell getprop ro.product.manufacturer   # Manufacturer

# Check storage space
adb shell df -h

# Get device battery status
adb shell dumpsys battery

# Take screenshot
adb exec-out screencap -p > screenshot.png

Debugging

# View real-time logs
adb logcat

# Filter logs by tag
adb logcat -s TAG_NAME

# Filter logs by package
adb logcat --pid=$(adb shell pidof -s com.github.zly2006.zhplus.lite)

# Save logs to file
adb logcat -d > logcat.txt

# Clear log buffer
adb logcat -c

Complete One-Line Command

For quick deployment after code changes:

./gradlew assembleLiteDebug && adb install -r ./app/build/outputs/apk/lite/debug/app-lite-debug.apk && adb shell am start -n com.github.zly2006.zhplus.lite/com.github.zly2006.zhihu.MainActivity

Advanced: Automatic Build and Deploy Script

Create a script deploy.sh:

#!/bin/bash

set -e  # Exit on error

echo "🔨 Building lite debug APK..."
./gradlew assembleLiteDebug --quiet

APK_PATH="./app/build/outputs/apk/lite/debug/app-lite-debug.apk"
PACKAGE_NAME="com.github.zly2006.zhplus.lite"
ACTIVITY="com.github.zly2006.zhihu.MainActivity"

# Check if APK was built
if [ ! -f "$APK_PATH" ]; then
    echo "❌ APK not found at $APK_PATH"
    exit 1
fi

echo "📱 Checking device connection..."
DEVICE_COUNT=$(adb devices | grep -w "device" | wc -l)

if [ "$DEVICE_COUNT" -eq 0 ]; then
    echo "❌ No devices connected"
    echo "Please connect a device and enable USB debugging"
    exit 1
fi

if [ "$DEVICE_COUNT" -gt 1 ]; then
    echo "⚠️  Multiple devices connected:"
    adb devices
    echo "Please specify device with: adb -s <device-id>"
    exit 1
fi

echo "📦 Installing APK..."
if adb install -r "$APK_PATH" 2>&1 | grep -q "Success"; 
     

     
    adb uninstall  2>/dev/null || 
     adb install  2>&1 | grep -q ; 
         
    
         
         1
    


 
adb shell am start -n 

 

Make it executable:

chmod +x deploy.sh
./deploy.sh

Troubleshooting Checklist

When things don't work, check these in order:

1. ✅ Is ADB installed? → which adb
2. ✅ Is ADB server running? → adb devices
3. ✅ Is device connected? → Should show device status
4. ✅ Is USB debugging enabled on device?
5. ✅ Is USB debugging authorized? → Accept prompt on device
6. ✅ Is APK built? → Check ./app/build/outputs/apk/lite/debug/
7. ✅ Is package name correct? → com.github.zly2006.zhplus.lite
8. ✅ Is activity name correct? → com.github.zly2006.zhihu.MainActivity
9. ✅ Check logs for errors → adb logcat

References

• ADB Documentation
• Android Build Types
• Project build config: ./app/build.gradle.kts
• App manifest: ./app/src/main/AndroidManifest.xml

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Last Updated: 2026-02-03
Tested with: ADB 1.0.41, Android SDK Platform Tools 36.0.2