Question

我需要从onPostExecute（异步任务（为了绘制图表，从var s（通信）到onCreatView）。这是我的代码：我尝试了许多解决方案，但我做不到。

String url;
    HashMap<String, String> params;
    int requestCode;
    PerformNetworkRequest3(String url, HashMap<String, String> params, int requestCode) {
        this.url = url;
        this.params = params;
        this.requestCode = requestCode;
    }
    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        try {
            JSONObject object = new JSONObject(s);
            if (!object.getBoolean("error")) {
                Toast.makeText(getContext(), object.getString("message"), Toast.LENGTH_SHORT).show();
                s = (object.getString("category"));  //need var s -> oncreateview
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }
    @Override
    protected String doInBackground(Void... voids) {
        RequestHandler requestHandler = new RequestHandler();

        if (requestCode == CODE_POST_REQUEST)
            return requestHandler.sendPostRequest(url, params);
        if (requestCode == CODE_GET_REQUEST)
            return requestHandler.sendGetRequest(url);

        return null;
    }

Answer 1

只需创建一个回调接口。最终解决方案是。

new PerformNetworkRequest3("", new HashMap<>(), 0, new PerformNetworkRequest3.OnResult() {
    @Override
    public void onSuccess(String s) {
        // check response here.
    }

    @Override
    public void onError() {

    }
});

并在下面替换为您的AsyncTask

import android.os.AsyncTask;
import android.widget.Toast;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.HashMap;

/**
 * Created by KHEMRAJ on 7/23/2018.
 */
public class PerformNetworkRequest3 extends AsyncTask<Void, Void, String> {
    String url;
    HashMap<String, String> params;
    int requestCode;
    private OnResult onResult;

    private interface OnResult{
        void onSuccess(String s); // you can change this String to any, like JsonObject            
        void onError();
    }

    PerformNetworkRequest3(String url, HashMap<String, String> params, int requestCode, OnResult onResult) {
        this.url = url;
        this.params = params;
        this.requestCode = requestCode;
        this.onResult = onResult;
    }

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        try {
            JSONObject object = new JSONObject(s);
            onResult.onSuccess(s);
            if (!object.getBoolean("error")) {
                Toast.makeText(getContext(), object.getString("message"), Toast.LENGTH_SHORT).show();
                s = (object.getString("category"));  //need var s -> oncreateview
            }
        } catch (JSONException e) {
            e.printStackTrace();
            onResult.onError();
        }
    }

    @Override
    protected String doInBackground(Void... voids) {
        RequestHandler requestHandler = new RequestHandler();
        if (requestCode == CODE_POST_REQUEST)
            return requestHandler.sendPostRequest(url, params);
        if (requestCode == CODE_GET_REQUEST)
            return requestHandler.sendGetRequest(url);

        return null;
    }
}

这只是一个实现。您可以根据需要更改回调方法。还要正确管理onError()和onSucess()。

Answer 2

尝试一下：-

<div class="field-group"  *ngFor="let mworkq of selectq">
        <div class="label-cust">{{mworkq.Question}}</div>
        <div class="field-cust">
          <select [(ngModel)]="selectedOption">
            <option value=''>Select</option>
            <option [hidden]="mworkq.option == null || mworkq.option.length == 0" *ngFor="let mworkq of mworkq.options" value="{{mworkq.option}}">{{mworkq.option}}</option>

           <!--  <option value="{{mworkq.option4}}">{{mworkq.option4}}</option> -->

          </select>
        </div>
      </div>
      <div class="field-group" *ngFor="let mworkq of textq">
        <div class="label-cust">
              {{mworkq.Question}}
              <ion-input [hidden]="mworkq.option == null || mworkq.option.length == 0"  *ngFor="let mworkq of mworkq.options" class="{{mworkq.option}}" type="number" placeholder="{{mworkq.option}}" ></ion-input>

        </div>
      </div>

在主要活动中，您应该实现接口AsyncResponse并重写其方法以获取值。

MainActivity.java

String url;
HashMap<String, String> params;
int requestCode;

public AsyncResponse delegate=null;

public interface AsyncResponse {
    void processFinish(String output);
}

 PerformNetworkRequest3(Context ctx, AsyncResponse asyncResponse) {
     context = ctx;
     delegate = asyncResponse;
}

PerformNetworkRequest3(String url, HashMap<String, String> params, int requestCode) {
    this.url = url;
    this.params = params;
    this.requestCode = requestCode;
}
@Override
protected void onPostExecute(String s) {
    super.onPostExecute(s);
    try {
        JSONObject object = new JSONObject(s);
        if (!object.getBoolean("error")) {
            Toast.makeText(getContext(), object.getString("message"), Toast.LENGTH_SHORT).show();
            s = (object.getString("category"));  //need var s -> oncreateview

        delegate.processFinish(s);

        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
}
@Override
protected String doInBackground(Void... voids) {
    RequestHandler requestHandler = new RequestHandler();

    if (requestCode == CODE_POST_REQUEST)
        return requestHandler.sendPostRequest(url, params);
    if (requestCode == CODE_GET_REQUEST)
        return requestHandler.sendGetRequest(url);

    return null;
}

从onPostExecute到OnCreateView获取JSON字符串

2 个答案: