How to passing variable value between classes in Java (Android Studio)?

Question

This is my variable:

public class List extends Activity {

double lat;
double lon;

public class MyLocationListener implements LocationListener{
  @Override
  public void onLocationChanged(Location loc){
    lat = loc.getLatitude();
    lon = loc.getLongitude();
  }
.......
}

I want to get the lat and lon values here:

public class AmbilData extends AsyncTask<String, String, String> {
    .....

    protected String doInBackground(String... arg0) {
    // TODO Auto-generated method stub

    String url;

    url = "http://anjayanjay.esy.es?lat="+lat+"&lon="+lon; //here i need the variable value
 .......................
 }

I'm new in using android studio, this code has lat = 0, and lon = 0 when I ran it. Could someone tell me how to fix this?

dont know what's your problem and where you call your AsysncTask. — Kingfisher Phuoc
– Kingfisher Phuoc, Commented Sep 28, 2015 at 2:10

Hong Duan · Accepted Answer · 2015-09-28 01:38:43Z

You can pass it via constructor:

public class List extends Activity {

double lat;
double lon;

public class MyLocationListener implements LocationListener{
  @Override
  public void onLocationChanged(Location loc){
    lat = loc.getLatitude();
    lon = loc.getLongitude();
    new AmbilData(loc).execute();
  }
.......
}

public class AmbilData extends AsyncTask<String, String, String> {
    private Location mLoc;
    .....

    public AmbilData(Location loc) {
        mLoc = loc;
    }

    protected String doInBackground(String... arg0) {
    // TODO Auto-generated method stub

    String url;

    url = "http://anjayanjay.esy.es?lat="+mLoc.getLatitude()+"&lon="+mLoc.getLongitude(); //here i need the variable value
 .......................
 }

or through the Param of AsyncTask, this need change your AsyncTask's first generic type:

public class List extends Activity {

double lat;
double lon;

public class MyLocationListener implements LocationListener{
  @Override
  public void onLocationChanged(Location loc){
    lat = loc.getLatitude();
    lon = loc.getLongitude();
    new AmbilData().execute(loc);
  }
.......
}

public class AmbilData extends AsyncTask<Location, String, String> {
    .....

    protected String doInBackground(Location... arg0) {
    // TODO Auto-generated method stub

    String url;

    url = "http://anjayanjay.esy.es?lat="+arg0[0].getLatitude()+"&lon="+arg0[0].getLongitude(); //here i need the variable value
 .......................
 }

Hong Thai · Accepted Answer · 2015-09-28 01:39:40Z

0

As I see, you get data from an AsynTask. Override onPostExcute() in your AsyncTask. Data (String) in doInbackground() available here when done. For simple example:

 @Override
protected void onPostExecute(String string) {
    // Call back Data and Display the current string data in the UI
    activity.callBackDataFromAsyncTask(string);
}

Hope this help!

answered Sep 28, 2015 at 1:39

Hong Thai

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