Add Android Download Manager status code handling and improve error message #297

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

 
             InputStream fs;
             if(path.startsWith(RNFetchBlobConst.FILE_PREFIX_BUNDLE_ASSET)) {
-                fs = RNFetchBlob.RCTContext.getAssets().open(path.replace(RNFetchBlobConst.FILE_PREFIX_BUNDLE_ASSET, ""));
+                fs = RNFetchBlob.RCTContext.getAssets()
+                        .open(path.replace(RNFetchBlobConst.FILE_PREFIX_BUNDLE_ASSET, ""));
             }
             else {
                 fs = new FileInputStream(new File(path));

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

                 DownloadManager dm = (DownloadManager) appCtx.getSystemService(Context.DOWNLOAD_SERVICE);
                 dm.query(query);
                 Cursor c = dm.query(query);
-                String error = null;
+
+
                 String filePath = null;
                 // the file exists in media content database
                 if (c.moveToFirst()) {
+                    // #297 handle failed request
+                    int statusCode = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));
+                    if(statusCode == DownloadManager.STATUS_FAILED) {
+                        this.callback.invoke("Download manager failed to download from  " + this.url + ". Statu Code = " + statusCode, null, null);
+                        return;
+                    }
                     String contentUri = c.getString(c.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
                     Uri uri = Uri.parse(contentUri);
                     Cursor cursor = appCtx.getContentResolver().query(uri, new String[]{android.provider.MediaStore.Images.ImageColumns.DATA}, null, null, null);
                             this.callback.invoke(null, RNFetchBlobConst.RNFB_RESPONSE_PATH, customDest);
 
                     } catch(Exception ex) {
-                        error = ex.getLocalizedMessage();
+                        ex.printStackTrace();
+                        this.callback.invoke(ex.getLocalizedMessage(), null);
                     }
                 }
                 else {