fix crash in using s_default_realm_directory

react-native/android/app/build.gradle

@@ -118,6 +118,7 @@ task buildReactNdkLib(dependsOn: [prepareJSC], type: Exec) {
             '-C', file('src/main/jni').absolutePath,
             '-B',
             'NDK_LOG=1',
+            'NDK_DEBUG=1',
             '--jobs', Runtime.runtime.availableProcessors(),
             'V=1'
 }

react-native/android/app/src/main/java/com/reacttests/RealmReactAndroid.java

@@ -30,10 +30,6 @@ public class RealmReactAndroid extends ReactContextBaseJavaModule {
 
     @Override
     public void initialize() {
-        Exception exception = new Exception();
-        exception.fillInStackTrace();
-        exception.printStackTrace();
-
         Log.w("RealmReactAndroid", injectRealmJsContext(filesDirPath));
     }
 
@@ -42,21 +38,6 @@ public class RealmReactAndroid extends ReactContextBaseJavaModule {
         return "RealmReactAndroid";
     }
 
-	@Override
-    public Map<String, Object> getConstants() {
-        final Map<String, Object> constants = new HashMap<>();
-        constants.put(DURATION_SHORT_KEY, Toast.LENGTH_SHORT);
-        constants.put(DURATION_LONG_KEY, Toast.LENGTH_LONG);
-
-        Exception exception = new Exception();
-        exception.fillInStackTrace();
-        exception.printStackTrace();
-
-        Log.w("RealmReactAndroid", injectRealmJsContext(filesDirPath));
-
-        return constants;
-    }
-
     @ReactMethod
     public void resultOfJsContextInjection(Callback successCallback) {
         // Inject our JS Context

react-native/android/app/src/main/jni/Android.mk

@@ -47,7 +47,7 @@ LOCAL_C_INCLUDES += core/include
 CXX11_FLAGS := -std=c++14
 LOCAL_CFLAGS += -fexceptions $(CXX11_FLAGS) -frtti
 LOCAL_EXPORT_CPPFLAGS := $(CXX11_FLAGS)
-
+LOCAL_LDLIBS    := -llog
 
 LOCAL_STATIC_LIBRARIES := realm-android-$(TARGET_ARCH_ABI)
 LOCAL_SHARED_LIBRARIES := libjsc

src/android/com_reacttests_RealmReactAndroid.cpp

@@ -10,6 +10,7 @@
 #include "js_init.h"
 #include "platform.hpp"
 #include <unordered_map>
+#include <android/log.h>
 
 /*
  * Class:     com_reacttests_RealmReactAndroid
@@ -19,7 +20,7 @@
 JNIEXPORT jstring JNICALL Java_com_reacttests_RealmReactAndroid_injectRealmJsContext
   (JNIEnv *env, jclass, jstring fileDir) 
   {
-  	
+  	__android_log_print(ANDROID_LOG_ERROR, "JSRealm", "Java_com_reacttests_RealmReactAndroid_injectRealmJsContext");
   	void* handle = dlopen ("libreactnativejni.so", RTLD_LAZY);
   	if (!handle) {
         return env->NewStringUTF("Cannot open library");
@@ -29,7 +30,9 @@ JNIEXPORT jstring JNICALL Java_com_reacttests_RealmReactAndroid_injectRealmJsCon
     const char* strFileDir = env->GetStringUTFChars(fileDir , NULL);
     std::string absoluteAppPath(strFileDir); 
     env->ReleaseStringUTFChars(fileDir , strFileDir);
+
       realm::set_default_realm_file_directory(absoluteAppPath);
+	__android_log_print(ANDROID_LOG_ERROR, "JSRealm", "Absolute path %s", realm::default_realm_file_directory().c_str());
 
     // load the symbol
 	typedef std::unordered_map<JSContextRef, facebook::react::JSCExecutor*> (*get_jsc_context_t)();

src/android/platform.cpp

@@ -6,9 +6,10 @@
  #include "../js_init.h"
 #include <string>
 
+std::string s_default_realm_directory;
+
 namespace realm {
 
-    static std::string s_default_realm_directory;
 void set_default_realm_file_directory(std::string dir) {
     s_default_realm_directory = dir;
 }

src/js_realm.cpp

@@ -105,8 +105,10 @@ std::map<std::string, JSValueRef> &RJSPrototypes(Realm *realm) {
     return static_cast<RJSRealmDelegate *>(realm->m_binding_context.get())->m_prototypes;
 }
 
-static std::string s_defaultPath = realm::default_realm_file_directory() + "/default.realm";
+// static std::string s_defaultPath = realm::default_realm_file_directory() + "/default.realm";
+static std::string s_defaultPath = "";
 std::string RJSDefaultPath() {
+    s_defaultPath = realm::default_realm_file_directory() + "/default.realm";
     return s_defaultPath;
 }
 void RJSSetDefaultPath(std::string path) {

src/platform.hpp

@@ -8,8 +8,9 @@
 
 #include <string>
 
-namespace realm {
+extern std::string s_default_realm_directory;
 
+namespace realm {
 //
 // These methods are used internally and must be implemented
 // separately for eadh platform