如何无依赖地获取Application的Context

/** * Created by zhangls on 2016/7/6. */
public class ContextProvider {
    private static Context sContext = null;

    /** * Get application context. * * @return */
    public static Context getApplicationContext() {
        if (sContext != null) {
            return sContext;
        }
        try {
            //1.先获取到当前的ActivityThread对象
            Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");
            //2.获取ActivityTread的静态方法currentApplication
            Method currentActivityThreadMethod = activityThreadClass.getDeclaredMethod("currentApplication");
            //隐藏Api，设置可访问
            currentActivityThreadMethod.setAccessible(true);
            //3.调用ActivityTread.currentApplication()
            Application currentApplication = (Application) currentActivityThreadMethod.invoke(null);
            sContext = currentApplication.getApplicationContext();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        if (sContext == null) {
            throw new NullPointerException("Global application uninitialized");
        }
        return sContext;
    }

    private ContextProvider() {

    }
}