android api json解析器_Android_Json_Nullpointerexception_Jsonparser

android api json解析器

android json

android api json解析器,android,json,nullpointerexception,jsonparser,Android,Json,Nullpointerexception,Jsonparser,嗨，我有一个应用程序显示了Twitch.tv的在线流光，数据来自我发送的请求，但我无法解析它们这是我的代码 public ArrayList<Twitch> ParseTwitch(JSONArray object, Context context){ ArrayList<Twitch> chanels = new ArrayList<>(); try { for (int i = 0;i<object.length();i++){

嗨，我有一个应用程序显示了Twitch.tv的在线流光，数据来自我发送的请求，但我无法解析它们这是我的代码

 public ArrayList<Twitch> ParseTwitch(JSONArray object, Context context){
ArrayList<Twitch> chanels = new ArrayList<>();
try {
    for (int i = 0;i<object.length();i++){
        JSONObject streamObjct = object.getJSONObject(i);
        JSONObject chanel = streamObjct.getJSONObject("channel");
        JSONObject url= streamObjct.getJSONObject("preview");
        final Twitch twitch = new Twitch();
        twitch.setName(chanel.getString(CHANEL_NAME));
        twitch.setStatus(chanel.getString(CHANEL_STATUS));
        twitch.setGame(streamObjct.getString(GAME));
        twitch.setLanguage(chanel.getString(BROADCASTER_LANGUAGE));
        twitch.setViewrs(streamObjct.getInt(VIEWRS));
        String imageUrl = url.getString("medium");
        ImageRequest request  =new ImageRequest(imageUrl, new Response.Listener<Bitmap>() {
            @Override
            public void onResponse(Bitmap response) {
                twitch.setLogo(response);
            }
        }, 0, 0, null, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });
        RequestQueue quew = Volley.newRequestQueue(context);
        quew.add(request);
        chanels.add(twitch);
    }
    return chanels;
}catch (JSONException e){
    e.printStackTrace();
}

return chanels;
}

我解决了这个问题，这是完整的代码

public class TwitchFragment extends Fragment {



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view=inflater.inflate(R.layout.twitch_main, container, false);
    String url="http://192.168.1.101/mySite/Flowers/flowers2.json";
    ListView mListView = (ListView) view.findViewById(R.id.twitch_last);
    prepareData(url,mListView);
    return view;
}
private void prepareData(String url, final ListView mListView) {

    JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            try {
                JSONArray stream = response.getJSONArray("streams");
                TwitchApiParser parser = new TwitchApiParser();
                ArrayList items= parser.ParseTwitch(stream,getActivity().getApplicationContext());
                TwitchAdapter adapter = new TwitchAdapter(getContext(),
                        R.layout.twitch,items);
                mListView.setAdapter(adapter);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getContext(), "Ridi Bro", Toast.LENGTH_SHORT).show();
        }
    });
    RequestQueue quew = Volley.newRequestQueue(getActivity().getApplicationContext());
    quew.add(request);
}

公共类TwitchFragment扩展片段{
@凌驾
CreateView上的公共视图（布局、充气机、视图组容器、捆绑包保存状态）{
视图=充气机。充气（R.layout.twitch_main，容器，错误）；
字符串url=”http://192.168.1.101/mySite/Flowers/flowers2.json";
ListView mListView=（ListView）view.findViewById（R.id.twitch_last）；
prepareData（url，mListView）；
返回视图；
}
私有void prepareData（字符串url，最终列表视图mListView）{
JsonObjectRequest=newJSONObjectRequest（request.Method.GET，url，null，new Response.Listener（））{
@凌驾
公共void onResponse（JSONObject响应）{
试一试{
JSONArray stream=response.getJSONArray（“streams”）；
TwitchApiParser=新TwitchApiParser（）；
ArrayList items=parser.ParseTwitch（流，getActivity（）.getApplicationContext（））；
TwitchAdapter adapter=新TwitchAdapter（getContext（），
R.布局、抽搐、项目）；
mListView.setAdapter（适配器）；
}捕获（JSONException e）{
e、 printStackTrace（）；
}
}
}，new Response.ErrorListener（）{
@凌驾
公共无效onErrorResponse（截击错误）{
Toast.makeText（getContext（），“Ridi Bro”，Toast.LENGTH_SHORT.show（）；
}
});
RequestQueue quew=Volley.newRequestQueue（getActivity（）.getApplicationContext（））；
补充（请求）；
}

和解析器

public class TwitchApiParser {
private final String CHANEL_NAME="display_name";
private final String GAME="game";
private final String CHANEL_STATUS = "status";
private final String BROADCASTER_LANGUAGE = "broadcaster_language";
private final String VIEWRS = "viewers";
public ArrayList<Twitch> ParseTwitch(JSONArray object, Context context){
ArrayList<Twitch> chanels = new ArrayList<>();
try {
    for (int i = 0;i<object.length();i++){
        JSONObject streamObjct = object.getJSONObject(i);
        JSONObject chanel = streamObjct.getJSONObject("channel");
        JSONObject url= streamObjct.getJSONObject("preview");
        final Twitch twitch = new Twitch();
        twitch.setName(chanel.getString(CHANEL_NAME));
        twitch.setStatus(chanel.getString(CHANEL_STATUS));
        twitch.setGame(streamObjct.getString(GAME));
        twitch.setLanguage(chanel.getString(BROADCASTER_LANGUAGE));
        twitch.setViewrs(streamObjct.getInt(VIEWRS));
        String imageUrl = url.getString("medium");
        ImageRequest request  =new ImageRequest(imageUrl, new Response.Listener<Bitmap>() {
            @Override
            public void onResponse(Bitmap response) {
                twitch.setLogo(response);
            }
        }, 0, 0, null, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });
        RequestQueue quew = Volley.newRequestQueue(context);
        quew.add(request);
        chanels.add(twitch);
    }
    return chanels;
}catch (JSONException e){
    e.printStackTrace();
}

return chanels;
}

公共类TwitchApiParser{
私有最终字符串CHANEL_NAME=“display_NAME”；
私人最终字符串游戏=“游戏”；
私人最终字符串CHANEL_STATUS=“STATUS”；
专用最终字符串广播者\ u语言=“广播者\ u语言”；
私有最终字符串viewers=“viewers”；
公共ArrayList ParseTwitch（JSONArray对象，上下文）{
ArrayList chanels=新ArrayList（）；
试一试{
for（int i=0；我“无法解析”没有充分描述问题…错误是什么？稍后再担心SQLite。你在哪里调用ParseTwitch
？请显示一个，好吗？我现在肯定会编辑我的帖子。你绝对肯定执行了return chanels；
吗？你是否遗漏了关于你的JSONException的任何其他异常消息？立即要解决这个问题，您确实应该将returnnull；
更改为returnchanels；，但由于JSON解析中出现异常，您似乎得到了一个空列表。
public class TwitchFragment extends Fragment {



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View view=inflater.inflate(R.layout.twitch_main, container, false);
    String url="http://192.168.1.101/mySite/Flowers/flowers2.json";
    ListView mListView = (ListView) view.findViewById(R.id.twitch_last);
    prepareData(url,mListView);
    return view;
}
private void prepareData(String url, final ListView mListView) {

    JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            try {
                JSONArray stream = response.getJSONArray("streams");
                TwitchApiParser parser = new TwitchApiParser();
                ArrayList items= parser.ParseTwitch(stream,getActivity().getApplicationContext());
                TwitchAdapter adapter = new TwitchAdapter(getContext(),
                        R.layout.twitch,items);
                mListView.setAdapter(adapter);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getContext(), "Ridi Bro", Toast.LENGTH_SHORT).show();
        }
    });
    RequestQueue quew = Volley.newRequestQueue(getActivity().getApplicationContext());
    quew.add(request);
}

public class TwitchApiParser {
private final String CHANEL_NAME="display_name";
private final String GAME="game";
private final String CHANEL_STATUS = "status";
private final String BROADCASTER_LANGUAGE = "broadcaster_language";
private final String VIEWRS = "viewers";
public ArrayList<Twitch> ParseTwitch(JSONArray object, Context context){
ArrayList<Twitch> chanels = new ArrayList<>();
try {
    for (int i = 0;i<object.length();i++){
        JSONObject streamObjct = object.getJSONObject(i);
        JSONObject chanel = streamObjct.getJSONObject("channel");
        JSONObject url= streamObjct.getJSONObject("preview");
        final Twitch twitch = new Twitch();
        twitch.setName(chanel.getString(CHANEL_NAME));
        twitch.setStatus(chanel.getString(CHANEL_STATUS));
        twitch.setGame(streamObjct.getString(GAME));
        twitch.setLanguage(chanel.getString(BROADCASTER_LANGUAGE));
        twitch.setViewrs(streamObjct.getInt(VIEWRS));
        String imageUrl = url.getString("medium");
        ImageRequest request  =new ImageRequest(imageUrl, new Response.Listener<Bitmap>() {
            @Override
            public void onResponse(Bitmap response) {
                twitch.setLogo(response);
            }
        }, 0, 0, null, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {

            }
        });
        RequestQueue quew = Volley.newRequestQueue(context);
        quew.add(request);
        chanels.add(twitch);
    }
    return chanels;
}catch (JSONException e){
    e.printStackTrace();
}

return chanels;
}