handles the case when getExternalFilesDir() returns NULL case in JNIHelper this avoid the hang when running on android-17
handles the case when getExternalFilesDir() returns NULL case in JNIHelper
this avoid the hang when running on android-17

ggfan/android-ndk,ggfan/android-ndk,ggfan/android-ndk,android/ndk-samples,ggfan/android-ndk,android/ndk-samples,android/ndk-samples,android/ndk-samples,android/ndk-samples,ggfan/android-ndk