java - 无法解析符号(变量)

Question

我是 Android 的新手，如果你能帮助我解决变量中的错误“无法解析符号......”，那就太好了:

- 值 1

- banner_id

- full_id

我的代码如下:

package com.example.sienstranslation.siensapp;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.gms.appdatasearch.GetRecentContextCall;

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

import java.util.HashMap;
import java.util.Map;

public class Main3Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);

        Intent intent=getIntent();
        double precio = intent.getExtras().getDouble("precio");
        String precio_rounded = String.format("%.2f", precio);
        TextView txtCambio = (TextView) findViewById(R.id.textView4);
        txtCambio.setText("Precio Total: "+ precio_rounded + " €");
    }

    void MakePostRequest() {
        String posting_url ="http://ipaddress/app.php";
        // its your url path ok
        StringRequest postRequest = new StringRequest(Request.Method.POST, posting_url ,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        try {
                            JSONObject jsonResponse = new JSONObject(response);
                            value1= jsonResponse.getString("precio_rounded");

                        } catch (JSONException e) {
                            e.printStackTrace();
                            banner_id = null;
                            full_id = null;
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        error.printStackTrace();
                        value1= null;
                    }
                }
        ) {
            // here is params will add to your url using post method
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<>();
                params.put("app", getString(R.string.app_name));
                //params.put("2ndParamName","valueoF2ndParam");
                return params;
            }
        };
        Volley.newRequestQueue(this).add(postRequest);
    }

非常感谢您的宝贵时间

Answer 1

首先，声明banner_id & full_id ;

public class Main3Activity extends AppCompatActivity {

public int banner_id,full_id;

然后清理重建您的项目。