android - 如何为 volley 库创建单独的类并从另一个 Activity 中调用 volley 的所有方法并获得响应？

Question

如何创建一个单独的类，在其中定义所有关于 volley在另一个 Activity 中，我们直接传递 URL、CONTEXT 和 Get Response...

Answer 1

首先在Activity中创建回调接口(interface)获取结果

public interface IResult {
    public void notifySuccess(String requestType,JSONObject response);
    public void notifyError(String requestType,VolleyError error);
}

使用 volley 函数创建一个单独的类，通过接口(interface)响应结果到 Activity

public class VolleyService {

    IResult mResultCallback = null;
    Context mContext;

    VolleyService(IResult resultCallback, Context context){
        mResultCallback = resultCallback;
        mContext = context;
    }


    public void postDataVolley(final String requestType, String url,JSONObject sendObj){
        try {
            RequestQueue queue = Volley.newRequestQueue(mContext);

            JsonObjectRequest jsonObj = new JsonObjectRequest(url,sendObj, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    if(mResultCallback != null)
                        mResultCallback.notifySuccess(requestType,response);
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    if(mResultCallback != null)
                        mResultCallback.notifyError(requestType,error);
                }
            });

            queue.add(jsonObj);

        }catch(Exception e){

        }
    }

    public void getDataVolley(final String requestType, String url){
        try {
            RequestQueue queue = Volley.newRequestQueue(mContext);

            JsonObjectRequest jsonObj = new JsonObjectRequest(Request.Method.GET, url, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject response) {
                    if(mResultCallback != null)
                        mResultCallback.notifySuccess(requestType, response);
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError error) {
                    if(mResultCallback != null)
                        mResultCallback.notifyError(requestType, error);
                }
            });

            queue.add(jsonObj);

        }catch(Exception e){

        }
    }
} 

然后将回调接口(interface)初始化为主Activity

    mResultCallback = new IResult() {
        @Override
        public void notifySuccess(String requestType,JSONObject response) {
            Log.d(TAG, "Volley requester " + requestType);
            Log.d(TAG, "Volley JSON post" + response);
        }

        @Override
        public void notifyError(String requestType,VolleyError error) {
            Log.d(TAG, "Volley requester " + requestType);
            Log.d(TAG, "Volley JSON post" + "That didn't work!");
        }
    };

现在创建 VolleyService 类的对象并传递给它上下文和回调接口(interface)

mVolleyService = new VolleyService(mResultCallback,this);

现在调用 Volley 方法进行发布或获取数据，同时传递 requestType，用于在将结果返回到主 Activity 时识别服务请求者

    mVolleyService.getDataVolley("GETCALL","http://192.168.1.150/datatest/get/data");
    JSONObject sendObj = null;

    try {
        sendObj = new JSONObject("{'Test':'Test'}");
    } catch (JSONException e) {
        e.printStackTrace();
    }
    mVolleyService.postDataVolley("POSTCALL", "http://192.168.1.150/datatest/post/data", sendObj);

最终的 MainActivity

public class MainActivity extends AppCompatActivity {
    private String TAG = "MainActivity";
    IResult mResultCallback = null;
    VolleyService mVolleyService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initVolleyCallback();
        mVolleyService = new VolleyService(mResultCallback,this);
        mVolleyService.getDataVolley("GETCALL","http://192.168.1.150/datatest/get/data");
        JSONObject sendObj = null;

        try {
            sendObj = new JSONObject("{'Test':'Test'}");
        } catch (JSONException e) {
            e.printStackTrace();
        }
        mVolleyService.postDataVolley("POSTCALL", "http://192.168.1.150/datatest/post/data", sendObj);
    }

    void initVolleyCallback(){
        mResultCallback = new IResult() {
            @Override
            public void notifySuccess(String requestType,JSONObject response) {
                Log.d(TAG, "Volley requester " + requestType);
                Log.d(TAG, "Volley JSON post" + response);
            }

            @Override
            public void notifyError(String requestType,VolleyError error) {
                Log.d(TAG, "Volley requester " + requestType);
                Log.d(TAG, "Volley JSON post" + "That didn't work!");
            }
        };
    }

}

在以下链接中找到整个项目

https://github.com/PatilRohit/VolleyCallback