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+#  Android SDK Tools: OpenCV requires Android SDK Tools revision 14 or newer
+
+## Android编译opencv编译出错，提示信息如下
+```
+-- Android: fixup -g compiler option from Android toolchain
+-- Update variable ANDROID_SDK from environment: /home/oskar/.buildozer/android/platform/android-sdk
+-- Android SDK Tools: ver. 2.0 (description: 'Android SDK Command-line Tools')
+-- Android SDK Build Tools: ver. 30.0.0-rc4 (subdir 30.0.0-rc4 from 30.0.0-rc4)
+CMake Error at cmake/android/OpenCVDetectAndroidSDK.cmake:176 (message):
+  Android SDK Tools: OpenCV requires Android SDK Tools revision 14 or newer.
+
+  Use BUILD_ANDROID_PROJECTS=OFF to prepare Android project files without
+  building them
+Call Stack (most recent call first):
+  CMakeLists.txt:780 (include)
+```
+## 解决办法
+```
+Download cmdlines-tools from google
+Create a directory for the android sdk at buildozer android location:
+mkdir ~/.buildozer/android/platform/android-sdk
+Move the zip to this folder and unzip it
+Rename the folder
+mv tools old-tools
+Install missing dependencies & the famous tools:
+sudo ./sdkmanager --sdk_root=/home/<USERNAME>/.buildozer/android/platform/android-sdk/ --install "tools"
+sudo ./sdkmanager --sdk_root=/home/<USERNAME>/.buildozer/android/platform/android-sdk/ --install "build-tools;29.0.0-rc3"
+sudo ./sdkmanager --sdk_root=/home/<USERNAME>/.buildozer/android/platform/android-sdk/ --install "platforms;android-27"
+sudo ./sdkmanager --sdk_root=/home/<USERNAME>/.buildozer/android/platform/android-sdk/ --install "platform-tools"
+sudo ./sdkmanager --sdk_root=/home/<USERNAME>/.buildozer/android/platform/android-sdk/ --install "patcher;v4"
+sudo ./sdkmanager --sdk_root=/home/<USERNAME>/.buildozer/android/platform/android-sdk/ --install "emulator"
+```