Выдаёт ошибку java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference at org.json?

Question

[Dmistass]

Делал приложение, которое берёт информацию с файла json, который находится на сайте. Всё проверил на двух эмуляторах перед тем как сделать релиз. В итоге на физических телефонах выдаёт ошибку:

java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.String.length()' on a null object reference
at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
at org.json.JSONTokener.nextValue(JSONTokener.java:94)
at org.json.JSONObject.<init>(JSONObject.java:159)
at org.json.JSONObject.<init>(JSONObject.java:176)
at com.kotikvorkotik.creeparealms.PlayerInfoActivity$GetURLData.onPostExecute(PlayerInfoActivity.java:111)
at com.kotikvorkotik.creeparealms.PlayerInfoActivity$GetURLData.onPostExecute(PlayerInfoActivity.java:56)
at android.os.AsyncTask.finish(AsyncTask.java:695)
at android.os.AsyncTask.access$600(AsyncTask.java:180)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6820)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:922)

Что делать?

Answer 1

[GavriKos]

Дебажить. Без кода тут вообще сказать нечего

Comments

[Dmistass]

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_player_info);

        textfield = findViewById(R.id.textfield);
        button = findViewById(R.id.button);
        info = findViewById(R.id.info);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(textfield.getText().toString().trim().equals(""))
                    Toast.makeText(PlayerInfoActivity.this, R.string.no_nick, Toast.LENGTH_LONG).show();
                else {

                    String url = "http://creeparealms.dmistas.beget.tech/app/players.json";

                    new GetURLData().execute(url);
                }
            }
        });
    }

    private class GetURLData extends AsyncTask<String, String, String> {

        protected void onPreExecute() {
            super.onPreExecute();
            info.setText("Обработка...");
        }

        @Override
        protected String doInBackground(String... strings) {
            HttpURLConnection connection = null;
            BufferedReader reader = null;

            try{
                URL url = new URL(strings[0]);
                connection = (HttpURLConnection) url.openConnection();
                connection.connect();

                InputStream stream = connection.getInputStream();
                reader = new BufferedReader(new InputStreamReader(stream));

                StringBuffer buffer = new StringBuffer();
                String line = "";

                while((line = reader.readLine()) != null)
                    buffer.append(line).append("\n");
                return buffer.toString();


            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (connection !=null)
                    connection.disconnect();

                if (reader !=null) {
                    try {
                        reader.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return null;
        }

        @SuppressLint("SetTextI18n")
        @Override
        protected  void onPostExecute(String result) {
            super.onPostExecute(result);

            String nick = textfield.getText().toString();

            try {
                JSONObject jsonObject = new JSONObject(result);
                JSONObject jsonInfo = (JSONObject) jsonObject.getJSONObject("players").getJSONObject("playerInfo").getJSONObject(nick);
                info.setText(nick + "\nВ вк: "
                        + jsonInfo.getString("VK") + "\nСервер: " + jsonInfo.getString("Server") + "\n" + jsonInfo.getString("Season") + "\nИграет? - " +
                        jsonInfo.getString("Play") + "\nРейтинг игрока: " + jsonInfo.getString("Rating") + "\nО игроке: " + jsonInfo.getString("About"));
            } catch (JSONException e) {
                e.printStackTrace();
            }



        }
    }

    public void openMain(View v) {
        Intent intent = new Intent(this, MainActivity.class);
        startActivity(intent);
    }
}