Merge pull request #607 from a-koka/master

getContentLengthLong requires API 24

Author: itinance

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

@@ -64,7 +64,7 @@ private void download(DownloadParams param, DownloadResult res) throws Exception
       connection.connect();
 
       int statusCode = connection.getResponseCode();
-      long lengthOfFile = connection.getContentLengthLong();
+      long lengthOfFile = getContentLength(connection);
 
       boolean isRedirect = (
         statusCode != HttpURLConnection.HTTP_OK &&
@@ -85,7 +85,7 @@ private void download(DownloadParams param, DownloadResult res) throws Exception
         connection.connect();
 
         statusCode = connection.getResponseCode();
-        lengthOfFile = connection.getContentLengthLong();
+        lengthOfFile = getContentLength(connection);
       }
       if(statusCode >= 200 && statusCode < 300) {
         Map<String, List<String>> headers = connection.getHeaderFields();
@@ -141,6 +141,13 @@ private void download(DownloadParams param, DownloadResult res) throws Exception
     }
   }
 
+  private long getContentLength(HttpURLConnection connection){
+    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.N) {
+      return connection.getContentLengthLong();
+    }
+    return connection.getContentLength();
+  }
+
   protected void stop() {
     mAbort.set(true);
   }