public class ContextUtils {

    private static Context applicationContext = null;

    public static Context getApplicationContext() {

        if (null != applicationContext) {

            return applicationContext;

        }

        final Object activityThread = getActivityThread();

        if (null != activityThread) {

            try {

                final Method getApplication = activityThread.getClass().getDeclaredMethod("getApplication");

                getApplication.setAccessible(true);

                applicationContext = (Context) getApplication.invoke(activityThread);

            } catch (Exception e) {

                e.printStackTrace();

            }

        }

        return applicationContext;

    }

    private static Object getActivityThread() {

        try {

            final Class<?> clz = Class.forName("android.app.ActivityThread");

            final Method method = clz.getDeclaredMethod("currentActivityThread");

            method.setAccessible(true);

            final Object activityThread = method.invoke(null);

            return activityThread;

        } catch(Exception e) {

            e.printStackTrace();

        }

    }

}