网络请求框架(二):volley使用之自定义请求

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一.导入volley的依赖或jar包

二.仿照StringRequest写一个自定义的请求对象,这样可以把json解析成需要的javabean

1.定义一个类继承request

public class MyRequest<T> extends Request<T> {    private static final String TAG = "MyRequest";    //需要解析的json字符串的泛型    private Class<T> mClass;    //解析成功后的接口对象,用于数据的回调    private  Response.Listener<T> mSuccessListener;        public MyRequest(String url, Class<T> clazz, Response.ErrorListener listener,Response.Listener<T> successListener) {        super(url, listener);        //通过构造函数,传入需要的字段        this.mClass=clazz;        this.mSuccessListener=successListener;    }        @Override    protected Response<T> parseNetworkResponse(NetworkResponse response) {        Gson gson =new Gson();        //根据gson解析,把从网络获取的字节数据解析成javabean        T t = gson.fromJson(new String(response.data), mClass);        return Response.success(t, HttpHeaderParser.parseCacheHeaders(response));    }    //数据的回调    @Override    protected void deliverResponse(T t) {        mSuccessListener.onResponse(t);    }}

二.javaBean

<pre name="code" class="java">public class JavaBean {    private static final String TAG = "JavaBean";    public int retcode;    public List<DataBean> data;    public List<Integer> extend;    public static class DataBean {        public int id;        public String title;        public int type;         public List<ChildrenBean> children;        public static class ChildrenBean {            public int id;            public String title;            public int type;            public String url;        }    }}

三.请求数据代码

public class MainActivity extends AppCompatActivity implements Response.ErrorListener, Response.Listener<JavaBean> {    public static final String HOST = "http://192.168.56.1:8080/zhbj/categories.json";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    /*volley请求三部曲    一.创建请求对象(解析数据成功或失败通过接口回调)    二.创建请求队列    三,添加请求到队列,发起请求    *     * */    public void request(View view){        //创建请求对象        MyRequest<JavaBean> request=new MyRequest<>(HOST,JavaBean.class,this,this);        //创建请求队列        RequestQueue queue = Volley.newRequestQueue(this);       //添加请求        queue.add(request);    }    @Override    public void onErrorResponse(VolleyError volleyError) {    }    @Override    public void onResponse(JavaBean javaBean) {        List<JavaBean.DataBean> data = javaBean.data;        Toast.makeText(this,data.size()+"个数" , Toast.LENGTH_SHORT).show();    }}

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