全局获取Context

public class MyApplication extends Application {    public static Context context;    @Override    public void onCreate() {        super.onCreate();        context = getApplicationContext();    }    public static Context getContext() {        return context;    }}

继承Application获得一个应用程序级别的Context,之后在任何的类中需要context调用MyApplication.getContext即可，需要在<application 标签下配置name 告诉程序启动初始化MyApplication