android.md

Android is a mobile operating system based on a modified version of the [[Linux]] kernel and other open source software, designed primarily for touchscreen mobile devices such as smartphones and tablets. Android is developed by a consortium of developers known as the Open Handset Alliance and commercially sponsored by Google. It was unveiled in November 2007, with the first commercial Android device launched in September 2008.

• https://developer.android.com/index.html

Learn

• Android Developer: Step by step guide to becoming an Android developer
• Android Developer Roadmap
• Training for Android developers - zh-CN
• Android Examples [Examples] Simple basic isolated apps, for budding android devs.
• Android Tips & Tricks ☑️ [Cheatsheet] Tips and tricks for Android Development

Practice

• Best practices in Android development: Do's and Don'ts for Android development, by Futurice developers
• Android Interview Questions

build

• 多渠道打包的进化史

apk unpack & repack

• apktool d test.apk
• apktool b test -o test.apk
• jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore test.keystore test.apk test -signedjar test_signed.apk
• apksigner sign --v1-signing-enabled true --v2-signing-enabled false --v3-signing-enabled false --ks test.keystore test.apk

sign

• 查看签名：
  • apksigner verify -v ./XXX.apk
  • Get APK Certificate Signature
    • unzip the APK and extract the file /META-INF/XXX.RSA
    • keytool -printcert -file XXX.RSA
• 重新签名（仅 V1）：
  • apksigner sign --v1-signing-enabled true --v2-signing-enabled false --v3-signing-enabled false --ks ./XXX.keystore ./XXX.apk
• keytool -printcert -jarfile XXX.apk
• keytool -list -v -keystore XXX.keystore

Android App Bundles

• Bundletool is a command-line tool to manipulate Android App Bundles
  • 查询 aab version code bundletool dump manifest --xpath /manifest/@android:versionCode --bundle AAB_FILE_PATH

Projects

• Telegram for Android source
• topeka, A fun to play quiz that showcases material design on Android
• androidpn, An open source project to provide push notification support for Android -- a xmpp based notification server and a client tool kit.

Tools

• scrcpy, Display and control your Android device
• LeakCanary is a memory leak detection library for Android. https://square.github.io/leakcanary
• AndroidGodEye A performance monitor tool , like "Android Studio profiler" for Android , you can easily monitor the performance of your app real time in pc browser
• Anbox is a container-based approach to boot a full Android system on a regular GNU/Linux system https://anbox.io
• AndroidAutoSize: A low-cost Android screen adaptation solution (今日头条屏幕适配方案终极版，一个极低成本的 Android 屏幕适配方案).

FAQs

• 旋转引起 Activity 销毁、创建
  • Android旋转屏幕时阻止activity重建
    • android:configChanges="orientation|screenSize"
  • 最近碰到的接微信支付引起的坑爹问题
• 网易MuMu模拟器MacOS环境连接调试
  • adb connect 127.0.0.1:22471
• AndroidStudio 代码全红，但可正常运行解决方法及解决后续代理的问题
  • File -> Invalidate Caches/Restart...
• Error type 3 Error: Activity class {} does not exist
  • File -> Invalidate Caches/Restart...
• 查看手机 OpenGLES 版本方法

  adb shell getprop ro.opengles.version
  # 确认返回值
  # ro.opengles.version=65535 # OpenGL ES 1.0
  # ro.opengles.version=65536 # OpenGL ES 1.1
  # ro.opengles.version=131072 # OpenGL ES 2.0
  # ro.opengles.version=196608 # OpenGL ES 3.0
  # ro.opengles.version=196609 # OpenGL ES 3.1

• 使用 adb 卸载指定 app

  adb devices
  adb shell pm list packages
  adb uninstall com.xxx.xxx
  

• 小米电视使用ADB模式安装软件
  • 局域网链接 adb connect 192.168.50.91
  • 文本输入 adb shell input text "something very long ...."
• adb: error: failed to read copy response
  • You should try with another USB cable/port: https://github.com/Genymobile/scrcpy/blob/master/FAQ.md#device-disconnected
  • If this does not fix the problem, might be a bug in the ROM (try with another device to confirm).
• App size increases when upgrading build tools and gradle version
  • v3.6+ The so library is no longer compressed, so that the operating system can map the so memory.
  • Native libraries packaged uncompressed by default
• 关于Android12安装apk出现-108异常INSTALL_PARSE_FAILED_MANIFEST_MALFORMED的解决方法
• This app was built for an older version of Android and doesn't include the latest privacy protections
  • Google started to enforce using minimum targetSdkVersion of 26 for APK installed outside the Google Play Store.
  • Playing with Android 14 Beta 3 and targetSdkVersion is minimum at '28' now.

Resources

• Awesome Android, A curated list of awesome Android libraries and resources. For general Java libraries have a look at awesome-java.
• Open-Source Android Apps, This is a collection of Android Apps which are open source.
• AndroidDevTools: 收集整理Android开发所需的Android SDK、开发中用到的工具、Android开发教程、Android设计规范，免费的设计素材等。