fix android build dir (#291)

* fix android build dir * update readme
realm · Mar 10, 2022 · a38a346 · a38a346
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diff --git a/README.md b/README.md
@@ -349,6 +349,11 @@ The Realm Dart package is `realm_dart`
     ./scripts/build-macos.sh
     ```
 
+* Linux
+    ```
+    ./scripts/build-linux.sh
+    ```
+
 ## Building Realm Dart
 
 * Windows

diff --git a/scripts/build-android.sh b/scripts/build-android.sh
@@ -8,12 +8,22 @@ set -o pipefail
 # Output is in PROJECT_DIR/binary directory 
 # example usage: ../realm-dart$./scripts/build-android.sh all
 
+if [ -z ${ANDROID_HOME} ]; then
+    echo "Environment variable ANDROID_HOME not set.";
+    exit 64 # Exit code 64 indicates a usage error.
+fi
+
+if [ -z ${ANDROID_NDK} ]; then
+    echo "Environment variable ANDROID_NDK not set.";
+    exit 64 # Exit code 64 indicates a usage error.
+fi
 
 # Start in the root directory of the project.
 cd "$(dirname "$0")/.."
 PROJECT_ROOT=$(pwd)
 
 mkdir -p build-android
+pushd build-android
 
 # build for x86 first to optimize for emulator testing