android - 为什么我在 json 中有双括号

Question

为什么我有两个'[['？ 应该是一个括号吗？ '['

[[{"name":"50 shade of gray","path":"http://api.androidhive.info/json/movies/1.jpg","description":"long story","likes":"5","comments":" Very nice"},{"name":"Transformers","path":"http://api.androidhive.info/json/movies/2jpg","description":"Robots","likes":"7","comments":" beautiful"},{"name":"Avangeers","path":"http://api.androidhive.info/json/movies/3.jpg","description":"hulk and iron man","likes":"8","comments":" wow"}]]

这是我的php

$sql = "select name , path , description , likes , comments from image ";

$res = mysqli_query($con,$sql);

$result = array();

while($row = mysqli_fetch_array($res)){
array_push($result,
array('name'=>$row[0],
'path'=>$row[1],
'description'=>$row[2],
'likes'=>$row[3],
'comments'=>$row[4]
));
}


echo json_encode(array($result));
mysqli_close($con);

在这样的代码中获取它是否正确？

   JsonArrayRequest movieReq = new JsonArrayRequest(url,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d("r", response.toString());
                        hidePDialog();
                        System.out.print(response);

                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {

                                JSONObject obj = response.getJSONObject(i);
                                Movie movie = new Movie();
                                movie.setTitle(obj.getString("name"));
                                movie.setThumbnailUrl(obj.getString("path"));
                                movie.setRating(obj.getString("description"));
                              //  movie.setRating(((Number) obj.get("description"))
                                    //    .doubleValue());
                                movie.setYear(obj.getString("likes"));
                              //  movie.setYear(obj.getInt("likes"));

                                // Genre is json array
                                JSONArray genreArry = obj.getJSONArray("comments");
                                ArrayList<String> genre = new ArrayList<String>();
                                for (int j = 0; j < genreArry.length(); j++) {
                                    genre.add((String) genreArry.get(j));
                                }
                                movie.setGenre(genre);

                                // adding movie to movies array
                                movieList.add(movie);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }

                        // notifying list adapter about data changes
                        // so that it renders the list view with updated data
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        System.out.print(error);
                        VolleyLog.d(TAG, "Error: " + error.getMessage());
                        hidePDialog();

                    }
                });

Answer 1

$result 是一个数组。 您在该数组中推送关联数组(成为对象)，所以现在您有 [{...},{...}]

然后你做:

echo json_encode(array($result));

所以你得到一个数组，里面有一个数组，导致上面的结果带有额外的'[':[[{...},{...}]]