Json Array 数据未进入 ArrayList答案

【问题标题】：Json Array data not getting into the ArrayListJson Array 数据未进入 ArrayList
【发布时间】：2017-03-24 11:39:46
【问题描述】：

我使用 Volley 从 JSON Array 收到响应。我得到了我需要的字符串。我想将这些字符串放在 ArrayList 中，以便将数据放在 recyclerview 适配器中。但是，这并没有发生。

这是 Json 请求：

    mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    mRecyclerView.setAdapter(mRecyclerViewAdapter);

    RequestQueue queue = VolleySingleton.getInstance(this).getRequestQueue();
    String url ="http://www.drunkenwords.in/web.php";

    JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, url, null,
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    JSONArray jsonArray;
                    ArrayList<Model> resp = new ArrayList<>();
                    try {
                        jsonArray = response.getJSONArray("info");
                        String x= response.getString("status");
                        Toast.makeText(MainActivity.this,x,Toast.LENGTH_LONG).show();
                        for(int i=0; i<jsonArray.length(); i++){


                            resp.add(new Model(jsonArray.getString(i)));
                            Toast.makeText(MainActivity.this,resp.get(i).getTitle(),Toast.LENGTH_LONG).show();

                        }
                        mRecyclerViewAdapter.setItems(resp);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.d("y", "Error: " + error.getMessage());
        }
    });

    queue.add(req);

    mRecyclerViewAdapter.setItems(ar);

    mRecyclerViewAdapter.notifyDataSetChanged();

请帮忙！

【问题讨论】：

标签： java android json arraylist android-volley

【解决方案1】：

试试这个

try {
                JSONObject jsonObject = new JSONObject(response);
                JSONArray jsonArray = jsonObject.getJSONArray("info");
                for(int i = 0; i < jsonArray.length(); i++)
                {
                    JSONObject jobj = jsonArray.getJSONObject(i);
                    String x= jobj.getString("status");
                    Toast.makeText(MainActivity.this,x,Toast.LENGTH_LONG).show();
                    resp.add(new Model(jsonArray.getString(i)));
                    Toast.makeText(MainActivity.this,resp.get(i).getTitle(),Toast.LENGTH_LONG).show();

                }
            } catch (JSONException e) {
                Log.e("exception", "Error parsing data " + e.toString());                   
            }

希望对你有所帮助。

【讨论】：

【解决方案2】：

Try This

mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mRecyclerView.setAdapter(mRecyclerViewAdapter);

RequestQueue queue = VolleySingleton.getInstance(this).getRequestQueue();
String url ="http://www.drunkenwords.in/web.php";

JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, url, null,
        new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(JSONObject response) {
                JSONArray jsonArray;
                ArrayList<Model> resp = new ArrayList<>();
                try {
                    jsonArray = response.getJSONArray("info");
                    String x= response.getString("status");
                    Toast.makeText(MainActivity.this,x,Toast.LENGTH_LONG).show();
                    for(int i=0; i<jsonArray.length(); i++){


                        resp.add(new Model(jsonArray.getString(i)));
                        Toast.makeText(MainActivity.this,resp.get(i).getTitle(),Toast.LENGTH_LONG).show();

                    }
                    mRecyclerViewAdapter.setItems(resp);
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }, new Response.ErrorListener() {
    @Override
    public void onErrorResponse(VolleyError error) {
        Log.d("y", "Error: " + error.getMessage());
    }
});

queue.add(req);

mRecyclerViewAdapter.notifyDataSetChanged();

mRecyclerViewAdapter.setItems(ar);

【讨论】：

【解决方案3】：

mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
    mRecyclerView.setLayoutManager(new LinearLayoutManager(this));


    RequestQueue queue = VolleySingleton.getInstance(this).getRequestQueue();
    String url ="http://www.drunkenwords.in/web.php";

    JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, url, null,
            new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    JSONArray jsonArray;
                    ArrayList<Model> resp = new ArrayList<>();
                    try {
                        jsonArray = response.getJSONArray("info");
                        String x= response.getString("status");
                        Toast.makeText(MainActivity.this,x,Toast.LENGTH_LONG).show();
                        for(int i=0; i<jsonArray.length(); i++){


                            resp.add(new Model(jsonArray.getString(i)));
                            Toast.makeText(MainActivity.this,resp.get(i).getTitle(),Toast.LENGTH_LONG).show();

                        }

                        mRecyclerViewAdapter.setItems(resp);
                        mRecyclerView.setAdapter(mRecyclerViewAdapter);
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Log.d("y", "Error: " + error.getMessage());
        }
    });

    queue.add(req);

    mRecyclerViewAdapter.setItems(ar);

    mRecyclerViewAdapter.notifyDataSetChanged();

【讨论】：