How to Integrate OpenWeatherMap API in an Android App

If you search on Google Play Store, you’ll find most weather apps either full of ads or require too many permissions, or includes unwanted features that most of us never use.

So, instead, wouldn’t it be great to offer a simple yet best weather app of your own eliminating those unwanted features that are irrelevant?

Today, in this Android weather app tutorial, we’ll learn how to implement OpenWeatherMap API in any android app with a simple user interface to offer current weather conditions.

Let’s Get Started

hand icon Create a new project and give name, package name and choose a location for the demo.

ssweatherappdemo1

hand icon In the next tab, choose Mini support SDK.

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hand icon Lastly, select ‘Add No Activity’.

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hand icon Now, create XML file for displaying weather data.

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:layout_weight="1" >
    <TextView
      android:id="@+id/cityText"
      style="?android:attr/textAppearanceMedium"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:textColor="#990000"
      android:layout_alignParentLeft="true">
    </TextView>
    <TextView
      android:id="@+id/temp"
      style="@style/tempStyle"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_below="@id/cityText"
      android:textColor="#000000"
      android:textSize="130sp"
      android:layout_centerHorizontal="true">
    </TextView>
    <TextView
      android:id="@+id/unittemp"
      android:layout_width="wrap_content"
      style="?android:attr/textAppearanceMedium"
      android:layout_height="wrap_content"
      android:layout_below="@id/cityText"
      android:layout_toRightOf="@id/temp"
      android:layout_alignBaseline="@id/temp">
      </TextView>
    <TextView
      android:id="@+id/skydesc"
      android:layout_width="wrap_content"
      style="?android:attr/textAppearanceMedium"
      android:layout_height="wrap_content"
      android:layout_below="@id/temp"
      android:layout_alignStart="@id/temp"
      android:layout_toRightOf="@id/temp">
      </TextView>
    <!-- Image weather condition -->
    <ImageView 
        android:id="@+id/condIcon"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_alignTop="@id/temp"
        android:layout_toRightOf="@id/temp"
    />
    </RelativeLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="6"
    >
    <android.support.v4.view.PagerTitleStrip
        android:id="@+id/pager_title_strip"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top"
        android:background="#000000"
        android:paddingBottom="4dp"
        android:paddingTop="4dp"
        android:textColor="#fff"
    />
    </android.support.v4.view.ViewPager>
</LinearLayout>
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hand icon Here, Viewpager is used to display 3 days data from today.

hand icon Set number of Days to get the data and also set the City and Country.

private static String forecastDaysNum = "3";
String city = "Ahmedabad, IN"; 
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hand icon Get all the fields in MainActivity and call the AsyncTask to get the weather data.

cityText = (TextView) findViewById(R.id.cityText);
temp = (TextView) findViewById(R.id.temp);
unitTemp = (TextView) findViewById(R.id.unittemp);
unitTemp.setText("C");
condDescr = (TextView) findViewById(R.id.skydesc);
pager = (ViewPager) findViewById(R.id.pager);
imgView = (ImageView) findViewById(R.id.condIcon);

// AsyncTask to call URL to get Weather data.
JSONWeatherTask task = new JSONWeatherTask();
task.execute(new String[]{city, lang});

JSONForecastWeatherTask task1 = new JSONForecastWeatherTask();
task1.execute(new String[]{city, lang, forecastDaysNum});
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hand icon Create one Class in which Url will be called and we will get the data named “WeatherHttpClient”.

public class WeatherHttpClient {
    private static String BASE_URL = "http://api.openweathermap.org/data/2.5/weather?q=";
    private static String IMG_URL = "http://openweathermap.org/img/w/";
    private static String BASE_FORECAST_URL = "http://api.openweathermap.org/data/2.5/forecast/daily?mode=json&q=";
    
    public String getWeatherData(String location, String lang) {
        HttpURLConnection con = null;
        InputStream is = null;
    
        try {
        String url = BASE_URL + location;
        if (lang != null) {
            url = url + "&lang=" + lang+"&APPID="+"<YOUR API KEY>";
        }
        Log.d("Tag","URL "+url);
        con = (HttpURLConnection) ( new URL(url)).openConnection();
        con.setRequestMethod("GET");
        con.setDoInput(true);
        con.setDoOutput(true);
        con.connect();
    
        // Let's read the response
        StringBuffer buffer = null;
        try {
            buffer = new StringBuffer();
            is = con.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String line = null;
            while ( (line = br.readLine()) != null ) {
            buffer.append(line + "\r\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        is.close();
        con.disconnect();
    
        return buffer.toString();
        } catch(Throwable t) {
        t.printStackTrace();
        } finally {
        try { is.close(); } catch(Throwable t) {}
        try { con.disconnect(); } catch(Throwable t) {}
        }
        return null;
    }
    
    public String getForecastWeatherData(String location, String lang, String sForecastDayNum) {
        HttpURLConnection con = null;
        InputStreamReader is = null;
        int forecastDayNum = Integer.parseInt(sForecastDayNum);
    
        try {
        // Forecast
        String url = BASE_FORECAST_URL + location;
        if (lang != null) {
            url = url + "&lang=" + lang;
        }
    
        url = url + "&cnt=" + forecastDayNum+"&APPID=";
        con = (HttpURLConnection) ( new URL(url)).openConnection();
        con.setRequestMethod("GET");
        con.setDoInput(true);
        con.setDoOutput(true);
        con.connect();
        StringBuffer buffer1 = null;
        Log.d("Tag","connection "+con.toString());
        try {
            // Let's read the response
            buffer1 = new StringBuffer();
            is = new InputStreamReader(con.getInputStream());//con.getInputStream();
            BufferedReader br1 = new BufferedReader(is);
            String line1 = null;
            while ( (line1 = br1  
                buffer1.append(line1 + "\r\n");
            } catch (IOException e) {
                e.printStackTrace();
            }
            is.close();
            con.disconnect();
            
            System.out.println("Buffer [" + buffer1.toString() + "]");
            return buffer1.toString();
            } catch (Throwable t) {
                t.printStackTrace();
            } finally {
                try {
                    is.close();
                } catch (Throwable t) {}
                try {
                    con.disconnect();
                } catch (Throwable t) {}
            }
            return null;
            
            public byte[] getImage(String code) {
            HttpURLConnection con = null;
            InputStream is = null;
            try {
                con = (HttpURLConnection)(new URL(IMG_URL + code)).openConnection();
                con.setRequestMethod("GET");
                con.setDoInput(true);
                con.setDoOutput(true);
                con.connect();
            
                // Let's read the response
                is = con.getInputStream();
                byte[] buffer = new byte[1024];
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
            
                while (is.read(buffer) != -1) {
                    baos.write(buffer);
                }
            
                return baos.toByteArray();
            } catch (Throwable t) {
                t.printStackTrace();
            } finally {
                try {
                    is.close();
                } catch (Throwable t) {}
                try {
                    con.disconnect();
                } catch (Throwable t) {}
        }
return null;
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hand icon To get API Key you need to create an account in http://api.openweathermap.org and need to create one API key and that key will be used here to get details.

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hand icon The details will be returned in JSON format so we have created one JSON parser class.

public class JSONWeatherParser {
    public static Weather getWeather(String data) throws JSONException {
        Weather weather = new Weather();
        System.out.println("Data ["+data+"]");
        // We create out JSONObject from the dataJSONObject jObj = new JSONObject(data);

        // We start extracting the infoLocation loc = new Location();

        JSONObject coordObj = getObject("coord", jObj);
        loc.setLatitude(getFloat("lat", coordObj));
        loc.setLongitude(getFloat("lon", coordObj));

        JSONObject sysObj = getObject("sys", jObj);
        loc.setCountry(getString("country", sysObj));
        loc.setSunrise(getInt("sunrise", sysObj));
        loc.setSunset(getInt("sunset", sysObj));
        loc.setCity(getString("name", jObj));
        weather.location = loc;

        // We get weather info (This is an array)
        JSONArray jArr = jObj.getJSONArray("weather");

        // We use only the first value
        JSONObject JSONWeather = jArr.getJSONObject(0);
        weather.currentCondition.setWeatherId(getInt("id", JSONWeather));
        weather.currentCondition.setDescr(getString("description", JSONWeather));
        weather.currentCondition.setCondition(getString("main", JSONWeather));
        weather.currentCondition.setIcon(getString("icon", JSONWeather));

        JSONObject mainObj = getObject("main", jObj);
        weather.currentCondition.setHumidity(getInt("humidity", mainObj));
        weather.currentCondition.setPressure(getInt("pressure", mainObj));
        weather.temperature.setMaxTemp(getFloat("temp_max", mainObj));
        weather.temperature.setMinTemp(getFloat("temp_min", mainObj));
        weather.temperature.setTemp(getFloat("temp", mainObj));

        // Wind
        JSONObject wObj = getObject("wind", jObj);
        weather.wind.setSpeed(getFloat("speed", wObj));
        weather.wind.setDeg(getFloat("deg", wObj));

        // Clouds
        JSONObject cObj = getObject("clouds", jObj);
        weather.clouds.setPerc(getInt("all", cObj));

        // We download the icon to show


        return weather;
    }

    public static WeatherForecast getForecastWeather(String data) throws JSONException {
        WeatherForecast forecast = new WeatherForecast();

        // We create out JSONObject from the data
        JSONObject jObj = new JSONObject(data);
        JSONArray jArr = jObj.getJSONArray("list"); // Here we have the forecast for every day

        // We traverse all the array and parse the data
        for (int i=0; i < jArr.length(); i++) {
            JSONObject jDayForecast = jArr.getJSONObject(i);

            // Now we have the json object so we can extract the data
            DayForecast df = new DayForecast();

            // We retrieve the timestamp (dt)
            df.timestamp = jDayForecast.getLong("dt");

            // Temp is an object
            JSONObject jTempObj = jDayForecast.getJSONObject("temp");

            df.forecastTemp.day = (float) jTempObj.getDouble("day");
            df.forecastTemp.min = (float) jTempObj.getDouble("min");
            df.forecastTemp.max = (float) jTempObj.getDouble("max");
            df.forecastTemp.night = (float) jTempObj.getDouble("night");
            df.forecastTemp.eve = (float) jTempObj.getDouble("eve");
            df.forecastTemp.morning = (float) jTempObj.getDouble("morn");

            // Pressure & Humidity
            df.weather.currentCondition.setPressure((float) jDayForecast.getDouble("pressure"));
            df.weather.currentCondition.setHumidity((float) jDayForecast.getDouble("humidity"));

            // ...and now the weather
            JSONArray jWeatherArr = jDayForecast.getJSONArray("weather");
            JSONObject jWeatherObj = jWeatherArr.getJSONObject(0);
            df.weather.currentCondition.setWeatherId(getInt("id", jWeatherObj));
            df.weather.currentCondition.setDescr(getString("description", jWeatherObj));
            df.weather.currentCondition.setCondition(getString("main", jWeatherObj));
            df.weather.currentCondition.setIcon(getString("icon", jWeatherObj));

            // Wind
            wObj = jDayForecast.getJSONObject("wind");
            df.weather.wind.setSpeed((float) wObj.getDouble("speed"));
            df.weather.wind.setDeg((float) wObj.getDouble("deg"));

            // Clouds
            df.weather.clouds.setPerc(jDayForecast.getInt("clouds"));

            // We add this object to the list
            forecast.addForecast(df);
            }

            return forecast;
            }

            private static JSONObject getObject(String tagName, JSONObject jObj) throws JSONException {
            return jObj.getJSONObject(tagName);
            }

            private static String getString(String tagName, JSONObject jObj) throws JSONException {
            return jObj.getString(tagName);
            }

            private static float getFloat(String tagName, JSONObject jObj) throws JSONException {
            return (float) jObj.getDouble(tagName);
            }

            private static int getInt(String tagName, JSONObject jObj) throws JSONException {
            return jObj.getInt(tagName);
            }
}
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hand icon Final data will be set in below fields.

cityText.setText(weather.location.getCity() + "," + weather.location.getCountry());
temp.setText("" + Math.round((weather.temperature.getTemp() - 275.15)));
condDescr.setText(
    weather.currentCondition.getCondition() + "(" + weather.currentCondition.getDescr() + ")"
);
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That’s it!

weatherappdemo

Neat and simple, right?

Though, there are several options to include the weather feature. For instance, news or other relatives apps can integrate the weather feature using OpenWeatherMap API to as an additional feature.

But, in order to do so, you might need to consult with a top Android app development company or contact expert developers to make sure the feature is implemented correctly.

Moreover, implementing this feature will not only make your app informative but adding an extra feature can further enhance your android application.

Bhaval Patel

Written by

Bhaval Patel

Bhaval Patel is a Director (Operations) at Space-O Technologies. He has 20+ years of experience helping startups and enterprises with custom software solutions to drive maximum results. Under his leadership, Space-O has won the 8th GESIA annual award for being the best mobile app development company. So far, he has validated more than 300 app ideas and successfully delivered 100 custom solutions using the technologies, such as Swift, Kotlin, React Native, Flutter, PHP, RoR, IoT, AI, NFC, AR/VR, Blockchain, NFT, and more.