Add missing Android implementation

Author: wkh237

android.js

@@ -21,18 +21,26 @@ function actionViewIntent(path:string, mime:string = 'text/plain') {
   if(Platform.OS === 'android')
     return RNFetchBlob.actionViewIntent(path, mime)
   else
-    return Promise.reject('RNFetchBlob.actionViewIntent only supports Android.')
+    return Promise.reject('RNFetchBlob.android.actionViewIntent only supports Android.')
 }
 
 function getContentIntent(mime:string) {
   if(Platform.OS === 'android')
     return RNFetchBlob.getContentIntent(mime)
   else
-    return Promise.reject('RNFetchBlob.getContentIntent only supports Android.')
+    return Promise.reject('RNFetchBlob.android.getContentIntent only supports Android.')
+}
+
+function addCompleteDownload(config) {
+  if(Platform.OS === 'android')
+    return RNFetchBlob.addCompleteDownload(config)
+  else
+    return Promise.reject('RNFetchBlob.android.addCompleteDownload only supports Android.')
 }
 
 
 export default {
   actionViewIntent,
-  getContentIntent
+  getContentIntent,
+  addCompleteDownload
 }

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

@@ -882,13 +882,21 @@ static boolean isAsset(String path) {
         return false;
     }
 
+    /**
+     * Normalize the path, remove URI scheme (xxx://) so that we can handle it.
+     * @param path URI string.
+     * @return Normalized string
+     */
     static String normalizePath(String path) {
         if(path == null)
             return null;
-        Uri uri = Uri.parse(path);
-        if(uri.getScheme() == null) {
+        if(!path.matches("\\w+\\:.*"))
             return path;
+        if(path.startsWith("file://")) {
+            return path.replace("file://", "");
         }
+
+        Uri uri = Uri.parse(path);
         if(path.startsWith(RNFetchBlobConst.FILE_PREFIX_BUNDLE_ASSET)) {
             return path;
         }