How to make global Class

public class AppConfig {

Context context;

public AppConfig(Context mxt) {

    context = mxt;
}

public static String filepath = null;
public static String imageupload = null;

public static Bitmap abjustbitmap = null;
}

other activity to use

AppConfig config;
Context context;

in oncreate method

    context = getApplicationContext();
    config = new AppConfig(context);