Refactor Android NDK installation script

Author: gnzlbg

ci/android-install-ndk.sh

@@ -11,8 +11,10 @@
 
 set -ex
 
-curl --retry 10 -O https://dl.google.com/android/repository/android-ndk-r19c-linux-x86_64.zip
-unzip -q android-ndk-r19c-linux-x86_64.zip
+NDK=android-ndk-r19c
+API=26
+curl --retry 10 -O https://dl.google.com/android/repository/${NDK}-linux-x86_64.zip
+unzip -q ${NDK}-linux-x86_64.zip
 
 case "$1" in
   aarch64)
@@ -28,9 +30,9 @@ case "$1" in
     ;;
 esac;
 
-android-ndk-r19c/build/tools/make_standalone_toolchain.py \
+${NDK}/build/tools/make_standalone_toolchain.py \
         --install-dir "/android/ndk-${1}" \
         --arch "${arch}" \
-        --api 26
+        --api ${API}
 
-rm -rf ./android-ndk-r15b-linux-x86_64.zip ./android-ndk-r15b
+rm -rf ./${NDK}-linux-x86_64.zip ./${NDK}

ci/android-install-sdk.sh

@@ -18,9 +18,10 @@ set -ex
 # located in https://github.com/appunite/docker by just wrapping it in a script
 # which apparently magically accepts the licenses.
 
+SDK=4333796
 mkdir sdk
-curl --retry 10 https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip -O
-unzip -d sdk sdk-tools-linux-4333796.zip
+curl --retry 10 https://dl.google.com/android/repository/sdk-tools-linux-${SDK}.zip -O
+unzip -d sdk sdk-tools-linux-${SDK}.zip
 
 case "$1" in
   arm | armv7)