问JSONObject类有问题，未给出错误

EN

File dir = new File(appInst.getStreamStoragePath()+"/"+content_path);
//Correct Path is formed and file object created
if(dir.exists() && dir.isDirectory())
{
    //Directory exists
    File[] files = dir.listFiles(); 

    //Was able to find the 2 files in this directory

    JSONObject output = new JSONObject();
    JSONArray directories = new JSONArray();
    JSONArray videos = new JSONArray();
    boolean access_allowed = true;

    //Nothing happens after these declarations, no errors
    //No thrown exceptions or console output

    for (int i = 0; i < files.length; i++) {
        //Build JSON objects+arrays with files
    }
}