工厂模式初探

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以okGO框架来看;
Step1：把http请求框架的共性方法抽取到接口中（也就是上述说的get/post/put/delete这些方法）

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public interface IRequestManger {
    void get(String url,String Canchekey,Object o,IRequestCallback callback);
    void Instance(Application o);
}

Step2:用Volley来实现IRequestManager这个接口.

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public class OKGoManager implements IRequestManger {
    public static OKGoManager getInstance() {
        return SingleonHolder.INSTANCE;
    }
    public static class SingleonHolder {
        private static final OKGoManager INSTANCE = new OKGoManager();
    }
    @Override
    public void get(String url, String Canchekey, Object o, final IRequestCallback callback) {
        OkGo.get(url)
                .tag(o)
                .cacheKey(Canchekey)
                .cacheMode(CacheMode.DEFAULT)
                .execute(new StringCallback() {
                    @Override
                    public void onSuccess(String s, Call call, Response response) {
                        callback.onSuccess(s);
                    }
                    @Override
                    public void onError(Call call, Response response, Exception e) {
                        callback.onFailure(response.body().toString());
                    }
                });
    }
    @Override
    public void Instance(Application o) {
        OkGo.init(o);
}
}

Step3：创建一个类来返回IRequestManager请求接口的对象 //工厂类;

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public class IRequestFactory {
    public static IRequestManger getRequestManager(){
        return OKGoManager.getInstance();
    }
}

Step4:调用上述方法进行测试

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IRequestManager requestManager = RequestFactory.getRequestManager();

接口 a = new 实现该接口的类();

衍生 java的接口是不能被实例化的,然而常见的点击事件中
new OnClickListener(){
……………
}
是用匿名内部类来完成的;