demos: Update smoke build script to be automatable

diff --git a/demos/smoke/android/build-and-install b/demos/smoke/android/build-and-install
index cbdaf0a..7402ec4 100755 (executable)
--- a/demos/smoke/android/build-and-install
+++ b/demos/smoke/android/build-and-install
@@ -2,13 +2,20 @@
 
 set -e
 
-SDK_DIR="$HOME/android/android-sdk-linux"
-NDK_DIR="$HOME/android/android-ndk-r10e"
+if [ -z "${ANDROID_SDK_HOME}" ];
+then echo "Please set ANDROID_SDK_HOME, exiting"; exit;
+else echo "ANDROID_SDK_HOME is ${ANDROID_SDK_HOME}";
+fi
+
+if [ -z "${ANDROID_NDK_HOME}" ];
+then echo "Please set ANDROID_NDK_HOME, exiting"; exit;
+else echo "ANDROID_NDK_HOME is ${ANDROID_NDK_HOME}";
+fi
 
 generate_local_properties() {
        : > local.properties
-       echo "sdk.dir=${SDK_DIR}" >> local.properties
-       echo "ndk.dir=${NDK_DIR}" >> local.properties
+       echo "sdk.dir=${ANDROID_SDK_HOME}" >> local.properties
+       echo "ndk.dir=${ANDROID_NDK_HOME}" >> local.properties
 }
 
 build() {