Catch exceptions when creating constants for sd card directories

android.js

@@ -38,9 +38,25 @@ function addCompleteDownload(config) {
     return Promise.reject('RNFetchBlob.android.addCompleteDownload only supports Android.')
 }
 
+function getSDCardDir() {
+  if(Platform.OS === 'android')
+    return RNFetchBlob.getSDCardDir()
+  else
+    return Promise.reject('RNFetchBlob.android.getSDCardDir only supports Android.')
+}
+
+function getSDCardApplicationDir() {
+  if(Platform.OS === 'android')
+    return RNFetchBlob.getSDCardApplicationDir()
+  else
+    return Promise.reject('RNFetchBlob.android.getSDCardApplicationDir only supports Android.')
+}
+
 
 export default {
   actionViewIntent,
   getContentIntent,
-  addCompleteDownload
+  addCompleteDownload,
+  getSDCardDir,
+  getSDCardApplicationDir,
 }

android/src/main/java/com/RNFetchBlob/RNFetchBlob.java

@@ -92,7 +92,6 @@ public void run() {
                 RNFetchBlobFS.createFile(path, content, encode, callback);
             }
         });
-
     }
 
     @ReactMethod
@@ -136,7 +135,6 @@ public void run() {
                 RNFetchBlobFS.createFileASCII(path, dataArray, callback);
             }
         });
-
     }
 
     @ReactMethod
@@ -167,7 +165,6 @@ public void run() {
                 RNFetchBlobFS.cp(path, dest, callback);
             }
         });
-
     }
 
     @ReactMethod
@@ -228,7 +225,6 @@ public void run() {
                 RNFetchBlobFS.writeFile(path, encoding, data, append, promise);
             }
         });
-
     }
 
     @ReactMethod
@@ -263,7 +259,6 @@ public void run() {
                 new RNFetchBlobFS(ctx).scanFile(p, m, callback);
             }
         });
-
     }
 
     @ReactMethod
@@ -324,7 +319,7 @@ public void enableUploadProgressReport(String taskId, int interval, int count) {
     @ReactMethod
     public void fetchBlob(ReadableMap options, String taskId, String method, String url, ReadableMap headers, String body, final Callback callback) {
         new RNFetchBlobReq(options, taskId, method, url, headers, body, null, mClient, callback).run();
-}
+    }
 
     @ReactMethod
     public void fetchBlobForm(ReadableMap options, String taskId, String method, String url, ReadableMap headers, ReadableArray body, final Callback callback) {
@@ -370,4 +365,13 @@ public void addCompleteDownload (ReadableMap config, Promise promise) {
 
     }
 
+    @ReactMethod
+    public void getSDCardDir(Promise promise) {
+        RNFetchBlobFS.getSDCardDir(promise);
+    }
+
+    @ReactMethod
+    public void getSDCardApplicationDir(Promise promise) {
+        RNFetchBlobFS.getSDCardApplicationDir(this.getReactApplicationContext(), promise);
+    }
 }

android/src/main/java/com/RNFetchBlob/RNFetchBlobFS.java

@@ -213,12 +213,38 @@ static public Map<String, Object> getSystemfolders(ReactApplicationContext ctx)
         state = Environment.getExternalStorageState();
         if (state.equals(Environment.MEDIA_MOUNTED)) {
             res.put("SDCardDir", Environment.getExternalStorageDirectory().getAbsolutePath());
-            res.put("SDCardApplicationDir", ctx.getExternalFilesDir(null).getParentFile().getAbsolutePath());
+            try {
+                res.put("SDCardApplicationDir", ctx.getExternalFilesDir(null).getParentFile().getAbsolutePath());
+            } catch(Exception e) {
+                res.put("SDCardApplicationDir", "");
+            }
         }
         res.put("MainBundleDir", ctx.getApplicationInfo().dataDir);
         return res;
     }
 
+    static public void getSDCardDir(Promise promise) {
+        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
+            promise.resolve(Environment.getExternalStorageDirectory().getAbsolutePath());
+        } else {
+            promise.reject("RNFetchBlob.getSDCardDir", "External storage not mounted");
+        }
+
+    }
+
+    static public void getSDCardApplicationDir(ReactApplicationContext ctx, Promise promise) {
+        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
+            try {
+                final String path = ctx.getExternalFilesDir(null).getParentFile().getAbsolutePath();
+                promise.resolve(path);
+            } catch (Exception e) {
+                promise.reject("RNFetchBlob.getSDCardApplicationDir", e.getLocalizedMessage());
+            }
+        } else {
+            promise.reject("RNFetchBlob.getSDCardApplicationDir", "External storage not mounted");
+        }
+    }
+
     /**
      * Static method that returns a temp file path
      * @param ctx   React Native application context

fs.js

@@ -28,8 +28,17 @@ const dirs = {
     MovieDir : RNFetchBlob.MovieDir,
     DownloadDir : RNFetchBlob.DownloadDir,
     DCIMDir : RNFetchBlob.DCIMDir,
-    SDCardDir : RNFetchBlob.SDCardDir,
-    SDCardApplicationDir : RNFetchBlob.SDCardApplicationDir,
+    get SDCardDir() {
+      console.warn('SDCardDir as a constant is deprecated and will be removed in feature release. ' +
+                   'Use RNFetchBlob.android.getSDCardDir():Promise instead.');
+      return RNFetchBlob.SDCardDir;
+    },
+    get SDCardApplicationDir() {
+      console.warn('SDCardApplicationDir as a constant is deprecated and will be removed in feature release. ' +
+                   'Use RNFetchBlob.android.getSDCardApplicationDir():Promise instead. ' +
+                   'This variable can be empty on error in native code.');
+      return RNFetchBlob.SDCardApplicationDir;
+    },
     MainBundleDir : RNFetchBlob.MainBundleDir,
     LibraryDir : RNFetchBlob.LibraryDir
 }