What is static context variables

Question

public Locator(Context mContext){
    getLocation();
    this.mContext = mContext;
}

public void setLatitude ( String lat ){
    this.latitude = lat;
}

public String getLatitude ( ){
    return latitude;
}

public void setLongitude ( String lon ){
    this.longitude = lon;
}

public String getLongitude ( ){
    return longitude;
}

public void getLocation ( ){
    LocationManager lm = (LocationManager)mContext.getSystemService ( Context.LOCATION_SERVICE ); 
    Location location = lm.getLastKnownLocation ( LocationManager.GPS_PROVIDER );
    longitude = String.valueOf(location.getLongitude());
    latitude = String.valueOf(location.getLatitude());
}

public static String getURL(){
    return "api.openweathermap.org/data/2.5/weather?lat=" + latitude + "&lon=" + longitude + "APPID=" + APPID;
}

Both the latitude and longitude variables give me the static-context error and also in the calling function. I've tried making them static variables but no luck. Any ideas?

In another part of the code I have but no matter what I do I get a static-context error somewhere:

final String url = getApiUrlFromAreaId(areaId);

static String getApiUrlFromAreaId ( String areaId ){
    return URL + areaId;
}

No my programming is not up to par. Please bear with me

Need to see more code, how is this being called. First impression is that you are calling on something that is not ready yet. — thekevshow, Jan 20 '19 at 22:04
You are using latitude and longitude from static method getURL() - as such both of them need to be static, are they? — Worthless, Jan 20 '19 at 22:05
Possible duplicate of [What is the difference between a static method and a non-static method?](https://stackoverflow.com/questions/3903537/what-is-the-difference-between-a-static-method-and-a-non-static-method) — Progman, Jan 20 '19 at 22:09
Please add the declaration of your class starting with `public class Locator` and the declaration of the `latitude`, `longitude` and `mContex`, as well as the compilation error you're seeing. — Mig82, Jan 20 '19 at 22:15

Antoniossss · Answer 1 · 2019-01-21T07:34:23.017

1

You got

public static String getURL()

which means that this method can be called without using class instance. As a consequence, everything that is used in that method, must be static as well (if not passed as argument).

I can only assume that either latitude,longitude or appId are not static. Either make them static as well, or remove static qualifier from getUrl.

edited Jan 21 '19 at 07:34

answered Jan 20 '19 at 22:10

Antoniossss

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score 0 · Answer 2 · answered Jan 20 '19 at 22:29

Assuming that the declaration of the latitude and longitude variables looks like this:

public class Locator{
   private String latitude; //Notice this var is not static.
   private String longitude; //Notice this var is not static.
}

and that you aim to call this from another class like so:

Locator loc = new Locator(someContext);
String url = loc.getURL();

then you have to declare the getURL method as non-static, meaning it can be invoked on a variable, and that the latitude and longitude variables it uses internally to compose the URL are the ones of said instance. So declare it like this:

public String getURL(){
   return "api.openweathermap.org/data/2.5/weather?" +
      "lat=" + latitude + //This instance's latitude
      "&lon=" + longitude + //This instance's longitude
      "APPID=" + APPID;
}

Now, if on the other hand your intention is to call this like so:

Locator loc = new Locator(someContext);
String url = Locator.getURL(loc);

Then notice here that getURL is a static method of the class, and NOT a method of an instance of the class. If this is your aim, then declare getURL like so:

public static String getURL(Locator loc){
   return "api.openweathermap.org/data/2.5/weather?" +
      "lat=" + loc.getLatitude() + //The latitude of instance loc
      "&lon=" + loc.getLongitude() + //The longitude of instance loc
      "APPID=" + APPID;
}

What is static context variables

2 Answers2