Calling web API and Receive return value in Android

Question

I\'ve googled for that topics and don\'t get any useful information.

I want to use Web API in my android projects, but don\'t know how to call them from android or j

Answer 1

public class JsonWebServiceCall {
// HttpURLConnection method to get JSON data from Webservice
public static String GetJsonString(String mUpdateUrl) {

    String result=null;
    try {

        URL url = new URL(mUpdateUrl);

        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        StringBuilder sb = new StringBuilder();

        con.setAllowUserInteraction(false);
        con.setInstanceFollowRedirects(true);
        // con.setRequestMethod("POST");
        con.connect();
         if (con.getResponseCode() == HttpURLConnection.HTTP_OK) {
        // BufferedReader bufferedReader = new BufferedReader(new
        // InputStreamReader(con.getInputStream()));
        try {
            InputStream in = new BufferedInputStream(con.getInputStream());

            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(in));

            String json;

            while ((json = bufferedReader.readLine()) != null) {
                System.out.println(mUpdateUrl + "kkkkkkkkk------" + json);
                sb.append(json + "\n");
            }
        } catch (Exception e) {

            e.printStackTrace();

        }
        Log.i("json", "===" + sb.toString().trim());
        result=sb.toString().trim();}
         else{
             result=null;
         }
 return result;
    } catch (Exception e) {
        return null;
    }

}

// HttpURLConnection method to get JSON data from Webservice
public static String PostJsonString(String mUpdateUrl, String webserviceurl) {

    // BufferedReader bufferedReader = null;
    try {

        String urlParameters = mUpdateUrl;
        URL url = new URL(webserviceurl);
        URLConnection conn = url.openConnection();
        StringBuilder sb = new StringBuilder();
        conn.setDoOutput(true);

        OutputStreamWriter writer = new OutputStreamWriter(
                conn.getOutputStream());

        writer.write(urlParameters);
        writer.flush();

        String line;
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                conn.getInputStream()));

        while ((line = reader.readLine()) != null) {
            System.out.println(line);
            sb.append(line + "\n");
        }
        writer.close();
        reader.close();
        return sb.toString().trim();
    } catch (Exception e) {
        return null;
    }

}

Asynchtask..........

public static class AsyncCriticalMessage extends AsyncTask {

    String result = null;
    CriticalMessageServiceSuccess criticalMessageServiceSuccess = null;

    public AsyncCriticalMessage(CriticalMessageServiceSuccess criticalMessageServiceSuccess) {
        this.criticalMessageServiceSuccess = criticalMessageServiceSuccess;
    }

    @Override
    protected Void doInBackground(Void... params) {
        result = JsonWebServiceCall.GetJsonString(Globals.FORCEUPDATE_MESSAGE_SERVICE_URL);
        return null;
    }

    @Override
    protected void onPostExecute(Void Result) {
        super.onPostExecute(Result);

        criticalMessageServiceSuccess.onSuccess(result);
    }
}
 AsyncCriticalMessage asyncCriticalMessage=new AsyncCriticalMessage(this);
    asyncCriticalMessage.execute();