java - Android : How to Pass the JSON object From AsncTask class to the Main Class -
    i have jsonobject  receiving api call within asynctask  class. want pass json object mainactivity  class show jsonobject  data in gui. found solutions throughout searches , came close solution. when access mainactivity  class says jsonobject  null. have dont wrong here? best way ?   following asynctask  class   import android.content.context; import android.os.asynctask; import android.util.log;  import org.apache.http.httpentity; import org.apache.http.httpresponse; import org.apache.http.client.httpclient; import org.apache.http.client.methods.httpget; import org.apache.http.impl.client.defaulthttpclient; import org.apache.http.util.entityutils; import org.json.jsonobject;  /**  * created nisal on 13-sep-17.  */  public class getstationsapicall extends asynctask<string, void, jsonobject> {      context ctx;     jsonobject responseobj;     string result;      public interface asyncresponse {         void processfinish(jsonobject output);     }      public asyncresponse deleg...