multithreading - Calling " getContentResolver " in an Android Java class -

i have service s contains thread t. have java class c. call method of class c thread t. method supposed contain lines :

uri uri = uri.parse("content://sms"); cursor cursor1 =  getcontentresolver().query(uri, null, null ,null, null); 

the problem error " cannot resolve methode 'getcontentresolver()' ". know matter of context, don't know how solve it.

edit

without considering thread t, tried :

the class c :

public class sms {  private arraylist<string> smslist = new arraylist<>();  public sms(context context){              uri uri = uri.parse("content://sms");     cursor cursor1 =  context.getcontentresolver().query(uri, null, null ,null, null);      } } 

the service s :

public class myservice extends service{      sms sms = new sms(this); } 

but error :

java.lang.nullpointerexception @ com.example.maxime.servicesms2.sms.<init>(sms.java:18) 

line 18 being :

cursor cursor1 =  context.getcontentresolver().query(uri, null, null ,null, null); 

thank !

you can make service child of android.app.service

public class services extends service {...} 

then have getcontentresolver() method