无法从静态方法Android访问任何静态方法：ContextWrapper类型的getResources（）

Question

I have a static class containing overlay items that is called by my main class and then added to an overlay itself.

I can get this to work without image types but I would like to use them, however when I do I get the following error: Cannot make a static reference to the non-static method getResources() from the type ContextWrapper

I have tried quite a few things to overcome this, by following some guides I have tried to add:

     private static Context context;

    public void onCreate(){
        super.onCreate();
        Mine.context = getApplicationContext();
    }

    public static Context getAppContext() {
        return Mine.context;
    }

I have also ensured that I have the class in question as an application in the manifest.

The class is as follows:

    public static ArrayList<ExtendedOverlayItem> array = new ArrayList<ExtendedOverlayItem>();

public ArrayList<ExtendedOverlayItem> getMine() {
    return array;
}



public static  void addMe() {
    Drawable myDrawable = getResources().getDrawable(R.drawable.draw);  //This is the line that doesn't work
    ExtendedOverlayItem myMarker1 = new ExtendedOverlayItem(
            "sample", "sample", new GeoPoint(85.123456,
                    -14.123456), null);
    myMarker1.setMarker(myDrawable);

    myMarker1.setDescription("This is a test description");
    array.add(myMarker1);
}

 private static Context context;

    public void onCreate(){
        super.onCreate();
        Mine.context = getApplicationContext();
    }

    public static Context getAppContext() {
        return Mine.context;
    }

I have tried adding the following :

myMarker1.setMarker(Mine.getAppContext().getResources().getDrawable(R.drawable.example));

But I still get null pointer errors when calling from the main method, If I leave the images out, it is called correctly.

In the main method I call this class as follows:

Mine.addMe();
ItemizedOverlayWithBubble<ExtendedOverlayItem> thisThing = new   ItemizedOverlayWithBubble<ExtendedOverlayItem>(this, Mine.array, map);
map.getOverlays().add(thisThing);

Any advice greatly appreciated.

Answer 1

In Java static method can not access any non-static method or variable.

One of the basic rules of working with static methods is that you can't access a nonstatic method or field from a static method because the static method doesn't have an instance of the class to use to reference instance methods or fields.

for more information Document

here is good example how to access them

Answer 2

if you have context set before this line

Drawable myDrawable = getResources().getDrawable(R.drawable.draw);

then use

Drawable myDrawable = context.getResources().getDrawable(R.drawable.draw);

as add me is static method and can not get context for getResources()

EDIT:

getResources() is called on context. and in your code you are calling it from a static method but static method can not access nonstatic method of your applications context. so you made a static object for context and stored your context in it. but have you checked that the context you set is not null and set before calling above line?