Avoid null dereference if directory is empty

Author: brarcher

app/src/main/java/videoeditor/bhuvnesh/com/ffmpegvideoeditor/activity/PreviewImageActivity.java

@@ -46,13 +46,14 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
             tvInstruction.setText("Images stored at path "+filePath);
             File[] listFile;
 
-                listFile = dir.listFiles();
+            listFile = dir.listFiles();
 
-
-
-            for(File e:listFile)
+            if(listFile != null)
             {
-                f.add(e.getAbsolutePath());
+                for(File e:listFile)
+                {
+                    f.add(e.getAbsolutePath());
+                }
             }
 
             PreviewImageAdapter rcAdapter = new PreviewImageAdapter( f);