Merge branch 'master' of https://github.com/ngrj/react-native-fs into ngrj-master

* 'master' of https://github.com/ngrj/react-native-fs:
  added a function called getAllExternalFilesDirs to get application-specific directories on all shared/external storage devices

FS.common.js

@@ -201,6 +201,10 @@ var RNFS = {
     return RNFSManager.getFSInfo();
   },
 
+  getAllExternalFilesDirs(): Promise<FSInfoResult> {
+    return RNFSManager.getAllExternalFilesDirs();
+  },
+
   unlink(filepath: string): Promise<void> {
     return RNFSManager.unlink(normalizeFilePath(filepath)).then(() => void 0);
   },

README.md

@@ -654,6 +654,10 @@ type FSInfoResult = {
 };
 ```
 
+### `getAllExternalFilesDirs(): Promise<ExternalFilesDirs>`
+
+Returns an array with the absolute paths to application-specific directories on all shared/external storage devices where the application can place persistent files it owns. 
+
 ### (iOS only) `pathForGroup(groupIdentifier: string): Promise<string>`
 
 `groupIdentifier` (`string`) Any value from the *com.apple.security.application-groups* entitlements list.

android/src/main/java/com/rnfs/RNFSManager.java

@@ -706,6 +706,16 @@ public class RNFSManager extends ReactContextBaseJavaModule {
     }
   }
 
+  @ReactMethod
+  public void getAllExternalFilesDirs(Promise promise){
+    File[] allExternalFilesDirs = this.getReactApplicationContext().getExternalFilesDirs(null);
+    WritableArray fs = Arguments.createArray();
+    for (File f : allExternalFilesDirs) {
+      fs.pushString(f.getAbsolutePath());
+    }
+    promise.resolve(fs);
+  }
+
   private void reject(Promise promise, String filepath, Exception ex) {
     if (ex instanceof FileNotFoundException) {
       rejectFileNotFound(promise, filepath);