如何从openweathermap API的天气预报数组中获取描述字符串？

Question

我正在尝试使用天气预报openweathermap API从天气数组中获取“说明”和“主要”字符串。 与天气api不同，天气预报具有一个“列表”数组，并且在该数组中，还有一个名为“天气”的数组。 我似乎无法以单个字符串的形式获得该信息。 我希望能够在TextView中显示“云”和“残云”

public class MainActivity extends AppCompatActivity {

        EditText cityName;
        TextView weatherTxt;
        TextView nameText;




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        cityName = (EditText) findViewById(R.id.cityName);
        weatherTxt = (TextView) findViewById(R.id.weatherTxt);
        nameText = (TextView) findViewById(R.id.cityNameTxt);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });

        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    public void GetWeather(View view){

        Log.i ("city name", cityName.getText().toString());

        InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
        mgr.hideSoftInputFromWindow(cityName.getWindowToken(), 0);

        downloadTask task = new downloadTask();
        task.execute("http://api.openweathermap.org/data/2.5/forecast?q="
                +cityName.getText().toString()+
                "&appid=71aefce4499fe64969286582c7e80ea2");


    }



    public class downloadTask extends AsyncTask<String, Void, String>{

        @Override
        protected String doInBackground(String... urls) {

            String result = "";
            URL url;
            HttpURLConnection urlConnection = null;

            try {
                url = new URL(urls[0]);

                urlConnection =  (HttpURLConnection) url.openConnection();

                InputStream in = urlConnection.getInputStream();

                InputStreamReader reader = new InputStreamReader(in);

                int data = reader.read();

                while (data != -1){

                    char current = (char) data;

                    result += current;

                    data = reader.read();
                }

                return result;


            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return null;
        }

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


        try {

            String mainTxt = "";
            String descriptionTxt = "";
            String weather = "";
            String tempratureTxt = "";
            String main = "";

            JSONObject jsonObject = new JSONObject(result);

            JSONObject city = jsonObject.getJSONObject("city");
            String name = city.getString("name");
            Log.i("name", name);

            JSONArray list = jsonObject.getJSONArray("list");
            JSONObject listObject = list.getJSONObject(0);



            for (int i =0; i <= 6; i++){ //look through all the list until you reach 7 (i.e. 7 day forecast)

                JSONObject weatherInfo = listObject.getJSONArray("weather").getJSONObject(0);
                String weatherMain = weatherInfo.getString("main");
                String weatherDescription = weatherInfo.getString("description");

                JSONObject mainTemp = listObject.getJSONObject("main");
                String temp = mainTemp.getString("temp");


                Log.i ("main", weatherMain);
                Log.i ("description", weatherDescription);
                Log.i ("temp", temp);

                weather = weatherMain;
                main = weatherDescription;
                tempratureTxt = temp;

                if (weather != ""){

                    mainTxt += "Day " +i+ ":  " +weather + "\r\n";
                    descriptionTxt += main + "\r\n";
                    tempratureTxt += temp + "\r\n";

                    //Toast.makeText(getBaseContext(), message + " - "
                           // + message,Toast.LENGTH_SHORT).show();

                }


            }



            //move this inside the while loop if you want to display all week



            //This displays the weather information in the Activity TextView
            if (mainTxt != ""){

                weatherTxt.setText(mainTxt);
                descriptionText.setText(descriptionTxt);
                temperatureText.setText(tempratureTxt);
                nameText.setText("The Weather in " +name+ " is: ");



            }


        } catch (JSONException e) {


            e.printStackTrace();
        }


    }
    }
}

Answer 1

尝试直接使用getJsonArray获取“列表”值，然后可以访问所需的索引，然后访问所需的键：

JsonArray list = jsonObject.getJsonArray("list");
JsonObject listObject = list.getJsonObject(0);
JsonObject weather = listObject.getJsonArray("weather").getJsonObject(0);
String weatherMain = weather.getString("main");
String weatherDesc = weather.getString("description");

如果希望它们全部存在，您可以将最后三行放在for循环中以遍历所有数组。