Myujth

The textview is not displaying the value I need. I am trying to get a weather forecast shown inside of it. However, when I try to, the app does not display anything at all.

<TextView
 android:id="@+id/degree"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:text="Loading..."
 android:textSize="60sp"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintLeft_toLeftOf="parent"
 app:layout_constraintRight_toRightOf="parent"
 app:layout_constraintTop_toTopOf="parent" />

Down is my main activity java class

public class MainActivity extends AppCompatActivity 

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

 TextView tv = findViewById(R.id.degree);

 WeatherTask task = new WeatherTask(tv);
 task.execute("moscow");
 

Here is the main java class that gets a forecast for a selected city

public class WeatherTask extends AsyncTask<String, Void, String> 

private static final String API_KEY = "06c7d6512a914b3029937dd444283ff0";
private final TextView textView;


public WeatherTask(TextView tv)
 this.textView = tv;


@Override
protected String doInBackground(String... cities) 
 String weather = "";

 try 
 String urlString = String.format(
 "http://api.openweathermap.org/data/2.5/weather?q=%s,uz&units=%s&appid=%s",
 cities[0], "metric", API_KEY
 );

 URL url = new URL(urlString);
 HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();

 urlConnection.connect();

 InputStream stream = new BufferedInputStream(urlConnection.getInputStream());
 BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream));

 StringBuilder builder = new StringBuilder();
 String inputString;

 while ((inputString = bufferedReader.readLine()) != null) 
 builder.append(inputString);
 

 String response = builder.toString();

 JSONObject topLevel = new JSONObject(response);

 JSONObject main = topLevel.getJSONObject("main");
 weather = String.valueOf(main.getDouble("temp"));
 urlConnection.disconnect();

 catch (IOException 

@Override
protected void onPostExecute(String weather)

 this.textView.setText(weather);
 

Can somebody please explain why textview is not shown on main activity?

Thank you

http://api.openweathermap.org/data/2.5/weather?q=%s,uz&units=%s&appid=%s" 

should be:

http://api.openweathermap.org/data/2.5/weather?q=%s&units=%s&appid=%s"

if you use first request, there should response like:

 "cod": "404",
 "message": "city not found"

because it will concate 'cities[0]' and ',uz' as first parameter.

I tried your URL, and it's returning a JSON response with different structure - it says unknown city. Perhaps you want to remove ,uz from your query:

"http://api.openweathermap.org/data/2.5/weather?q=%s&units=%s&appid=%s"

You should also check your log, e.printStacktrace would have provided clear error message. Also I checked that uz is a country code for Uzbekistan, but I'm sure Moscow is in Russia, so maybe that's where it fails and explains why your TextView isn't getting anything.