Hello I have a project in android studio which saves the user's location (longitude and latitude), for this I have created a series of methods in a single Activity, now what I need is that when the user changes activity I follow saving the location, I created a thread in another activity to call the method where the location is saved in the other Activity but it shows me a null error. Here I leave the thread code:
public class Activity2 extends AppCompatActivity implements TabLayout.OnTabSelectedListener{
Activity1 x;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
x=new Activity1();
time time=new time();
ejecutar();
}
public void hilo(){
Thread t=new Thread();
try{
Thread.sleep(600000);
}catch (Exception e){
e.printStackTrace();
}
t.start();
}
public void ejecutar(){
x.GuardarUbicacion();//aqui manda el error
time time=new time();
time.execute();
}
public class time extends AsyncTask <Void, Integer,Boolean>{
@Override
protected Boolean doInBackground(Void... voids) {
hilo();
return true;
}
@Override
public void onPostExecute(Boolean aBoolean){
ejecutar();
Toast.makeText(Activity2.this, "La ubicacion se guarda cada 10min", Toast.LENGTH_SHORT).show();
}
}Error: Attempt to invoke virtual method 'android.os.Looper android.content.Context.getMainLooper ()' on a null object reference