Question

我正在尝试从外部数据库填充我的应用程序中的所有微调器。问题是我的应用程序粉碎了代码行：

cat_sp_add=(Spinner)findViewById(R.id.categories_add_new_product);

即时通讯使用正如你在代码中看到的方法runOnUiThread但仍然是它的结果。这是代码。有人可以告诉我，我做错了什么？

package com.example.zygy1;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;



public class Load_lists extends Activity implements Runnable {

final String TAG_SUCCESS = "success";
final String TAG_CITIES = "cities";
final String TAG_CATEGORIES = "categories";
final String TAG_NAME = "name";

final String url_load_lists = "http://zygy.co.il/lib/android_connect/load_lists.php";
boolean error=false;

JSONParser jParser = new JSONParser();
ArrayList<String> CategoriesList;
ArrayList<String> CitiesList;
JSONArray categories = null;
JSONArray cities = null;
ArrayAdapter<String> adapter;
static Spinner cities_sp_add;
static  Spinner cities_sp_signUp;
static  Spinner cat_sp_add;
static  Spinner cat_sp_search;


@Override
public void run() {   

runOnUiThread(new Runnable(){

     public void run(){
            ArrayList<Product> productList_final=new ArrayList<Product>();
            cat_sp_add=(Spinner)findViewById(R.id.categories_add_new_product);
             cat_sp_search=(Spinner)findViewById(R.id.categories_search);
                cities_sp_add=(Spinner) findViewById(R.id.cities_add_new_product);
                cities_sp_signUp=(Spinner) findViewById(R.id.cities_signUp);
            CategoriesList = new ArrayList<String>();
            CitiesList = new ArrayList<String>();
            // Building Parameters
       List<NameValuePair> params = new ArrayList<NameValuePair>();
                 params.add(new BasicNameValuePair(TAG_CITIES,"true"));
            params.add(new BasicNameValuePair(TAG_CATEGORIES,"true"));

            // getting JSON string from URL
            JSONObject json = jParser.makeHttpRequest(url_load_lists, "GET", params);

            // Check your log cat for JSON reponse
           Log.d("Add new product ", json.toString());
 // getting lists from database
            try {
                // Checking for SUCCESS TAG
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {
                    categories=json.getJSONArray(TAG_CATEGORIES);
                    for (int i = 0; i < categories.length(); i++) {
                        JSONObject c = categories.getJSONObject(i);
                        String cat_name = new String();
                        cat_name=c.getString(TAG_NAME);
                        CategoriesList.add(cat_name);
                    }
                    cities=json.getJSONArray(TAG_CITIES);
                    for (int i = 0; i < cities.length(); i++) {
                        JSONObject c = cities.getJSONObject(i);
                        String city_name = new String();
                        city_name=c.getString(TAG_NAME);
                        CitiesList.add(city_name);
                    }
                }
                 else {
                    // no match found
                   error=true;
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }
// set lists in all application
        if(!error){
            adapter = new ArrayAdapter<String>(getApplicationContext(),
            R.layout.spinner_text,CategoriesList);
            adapter.setDropDownViewResource(R.layout.spinner_text);
            cat_sp_add.setAdapter(adapter);
  //          cat_sp_search.setAdapter(adapter);

           adapter = new ArrayAdapter<String>(getApplicationContext(),
           R.layout.spinner_text,CitiesList);
           adapter.setDropDownViewResource(R.layout.spinner_text);
           cities_sp_add.setAdapter(adapter);
  //         cities_sp_signUp.setAdapter(adapter);

           }
            else {
                   Toast.makeText(getApplicationContext(), "error in uploading lists", Toast.LENGTH_LONG).show();
            }        
     }});
     }

}

激活线程的主类：

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Load_lists load=new Load_lists();
    Thread load_lists=new Thread(load);
    load_lists.start();
    setContentView(R.layout.activity_log_in);
    bt_log_in=(Button)findViewById(R.id.button_log_in);
    bt_sign_up=(Button)findViewById(R.id.button_sign_up);
    ....contine }

Answer 1

尝试从onCreate中的线程中解析变量。

确保将它们设为最终，然后您可以在线程中访问它。

原因是，启动Thread时未加载Layout。您可能还想在启动Thread之前尝试使用setContentView（）。

从螺纹中填充旋转器

1 个答案: