Android 从MySQL数据库操作ListView

Android 从MySQL数据库操作ListView,android,android-listview,Android,Android Listview,我正在跟踪并试图从MySQL数据库操作ListView,但我的应用程序崩溃了,LogCat说: 11-28 11:06:42.093: E/AndroidRuntime(874): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wintel.vasonapps/com.wintel.vasonapps.AllRBT}: java.lang.RuntimeException: Your content

我正在跟踪并试图从
MySQL
数据库操作
ListView
,但我的应用程序崩溃了,LogCat说:

11-28 11:06:42.093: E/AndroidRuntime(874): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.wintel.vasonapps/com.wintel.vasonapps.AllRBT}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
    <!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
    <TextView
        android:id="@+id/pid"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="gone" />

    <!-- Name Label -->
    <TextView
        android:id="@+id/name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingTop="6dip"
        android:paddingLeft="6dip"
        android:textSize="17dip"
        android:textStyle="bold" />

</LinearLayout>
虽然我有一个名为
list
的列表视图。布局如下:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ListView>

</LinearLayout>
    <!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
    <TextView
        android:id="@+id/pid"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="gone" />

    <!-- Name Label -->
    <TextView
        android:id="@+id/name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingTop="6dip"
        android:paddingLeft="6dip"
        android:textSize="17dip"
        android:textStyle="bold" />

</LinearLayout>
有人能说出我的应用程序崩溃的原因吗?如果需要更多的代码,请告诉我,我会用这些代码编辑这个问题。提前谢谢

    <!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
    <TextView
        android:id="@+id/pid"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="gone" />

    <!-- Name Label -->
    <TextView
        android:id="@+id/name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingTop="6dip"
        android:paddingLeft="6dip"
        android:textSize="17dip"
        android:textStyle="bold" />

</LinearLayout>
编辑:这是
AllRBT.java
,设置ID后,第57行出现错误

    <!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
    <TextView
        android:id="@+id/pid"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:visibility="gone" />

    <!-- Name Label -->
    <TextView
        android:id="@+id/name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingTop="6dip"
        android:paddingLeft="6dip"
        android:textSize="17dip"
        android:textStyle="bold" />

</LinearLayout>
package com.wintel.vasonapps;

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

import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

public class AllRBT extends ListActivity {

    // Progress Dialog
    private ProgressDialog pDialog;

    // Creating JSON Parser object
    JSONParser jParser = new JSONParser();

    ArrayList<HashMap<String, String>> productsList;

    // url to get all products list
    private static String url_all_products = "http://127.0.0.1/test/apps.php";

    // JSON Node names
    private static final String TAG_SUCCESS = "success";
    private static final String TAG_PRODUCTS = "products";
    private static final String TAG_PID = "pid";
    private static final String TAG_NAME = "name";

    // products JSONArray
    JSONArray products = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_all_rbt);

        // Hashmap for ListView
        productsList = new ArrayList<HashMap<String, String>>();

        // Loading products in Background Thread
        new LoadAllProducts().execute(); //Line 57, this line throws error

        // Get listview
        ListView lv = getListView();

        // on seleting single product
        // launching Edit Product Screen
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // getting values from selected ListItem
                String pid = ((TextView) view.findViewById(R.id.pid)).getText()
                        .toString();

                // Starting new intent
                //Intent in = new Intent(getApplicationContext(),
                  //      EditProductActivity.class);
                // sending pid to next activity
                //in.putExtra(TAG_PID, pid);

                // starting new activity and expecting some response back
                //startActivityForResult(in, 100);
            }
        });

    }

    // Response from Edit Product Activity
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // if result code 100
        if (resultCode == 100) {
            // if result code 100 is received
            // means user edited/deleted product
            // reload this screen again
            Intent intent = getIntent();
            finish();
            startActivity(intent);
        }

    }

    /**
     * Background Async Task to Load all product by making HTTP Request
     * */
    class LoadAllProducts extends AsyncTask<String, String, String> {

        /**
         * Before starting background thread Show Progress Dialog
         * */
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pDialog = new ProgressDialog(AllRBT.this);
            pDialog.setMessage("Loading ring back tones. Please wait...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(false);
            pDialog.show();
        }

        /**
         * getting All products from url
         * */
        protected String doInBackground(String... args) {
            // Building Parameters
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            // getting JSON string from URL
            JSONObject json = jParser.makeHttpRequest(url_all_products, "GET", params);

            // Check your log cat for JSON reponse
            Log.d("All Products: ", json.toString());

            try {
                // Checking for SUCCESS TAG
                int success = json.getInt(TAG_SUCCESS);

                if (success == 1) {
                    // products found
                    // Getting Array of Products
                    products = json.getJSONArray(TAG_PRODUCTS);

                    // looping through All Products
                    for (int i = 0; i < products.length(); i++) {
                        JSONObject c = products.getJSONObject(i);

                        // Storing each json item in variable
                        String id = c.getString(TAG_PID);
                        String name = c.getString(TAG_NAME);

                        // creating new HashMap
                        HashMap<String, String> map = new HashMap<String, String>();

                        // adding each child node to HashMap key => value
                        map.put(TAG_PID, id);
                        map.put(TAG_NAME, name);

                        // adding HashList to ArrayList
                        productsList.add(map);
                    }
                } else {
                    // no products found
                    // Launch Add New product Activity
                    //Intent i = new Intent(getApplicationContext(),
                      //      NewProductActivity.class);
                    // Closing all previous activities
                    //i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    //startActivity(i);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

            return null;
        }

        /**
         * After completing background task Dismiss the progress dialog
         * **/
        protected void onPostExecute(String file_url) {
            // dismiss the dialog after getting all products
            pDialog.dismiss();
            // updating UI from Background Thread
            runOnUiThread(new Runnable() {
                public void run() {
                    /**
                     * Updating parsed JSON data into ListView
                     * */
                    ListAdapter adapter = new SimpleAdapter(
                            AllRBT.this, productsList,
                            R.layout.list_item, new String[] { TAG_PID,
                                    TAG_NAME},
                            new int[] { R.id.pid, R.id.name });
                    // updating listview
                    setListAdapter(adapter);
                }
            });

        }

    }
}
package com.wintel.vasonaps;
导入java.util.ArrayList;
导入java.util.HashMap;
导入java.util.List;
导入org.apache.http.NameValuePair;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入android.app.ListActivity;
导入android.app.ProgressDialog;
导入android.content.Intent;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.AdapterView.OnItemClickListener;
导入android.widget.ListAdapter;
导入android.widget.ListView;
导入android.widget.simpledapter;
导入android.widget.TextView;
公共类AllRBT扩展ListActivity{
//进度对话框
私人对话;
//创建JSON解析器对象
JSONParser jParser=新的JSONParser();
ArrayList productsList;
//获取所有产品列表的url
私有静态字符串url\u所有产品=”http://127.0.0.1/test/apps.php";
//JSON节点名称
私有静态最终字符串标记_SUCCESS=“SUCCESS”;
私有静态最终字符串TAG_PRODUCTS=“PRODUCTS”;
私有静态最终字符串标记_PID=“PID”;
私有静态最终字符串标记_NAME=“NAME”;
//产品JSONArray
JSONArray产品=null;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u all\u rbt);
//ListView的Hashmap
productsList=新的ArrayList();
//在后台线程中加载产品
new LoadAllProducts().execute();//第57行,此行抛出错误
//获取列表视图
ListView lv=getListView();
//论单产品的选择
//启动编辑产品屏幕
lv.setOnItemClickListener(新的OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父级、视图、,
内部位置,长id){
//从选定的ListItem获取值
字符串pid=((TextView)view.findViewById(R.id.pid)).getText()
.toString();
//开始新的意图
//Intent in=新的Intent(getApplicationContext(),
//EditProductActivity.class);
//将pid发送到下一个活动
//in.putExtra(标签号PID,PID);
//开始新的活动并期望得到一些响应
//startActivityForResult(in,100);
}
});
}
//编辑产品活动的响应
@凌驾
受保护的void onActivityResult(int请求代码、int结果代码、意图数据){
super.onActivityResult(请求代码、结果代码、数据);
//如果结果代码为100
如果(结果代码==100){
//如果收到结果代码100
//指用户编辑/删除的产品
//重新加载此屏幕
Intent=getIntent();
完成();
星触觉(意向);
}
}
/**
*通过发出HTTP请求加载所有产品的后台异步任务
* */
类LoadAllProducts扩展了AsyncTask{
/**
*在启动后台线程显示进度对话框之前
* */
@凌驾
受保护的void onPreExecute(){
super.onPreExecute();
pDialog=新建进度对话框(AllRBT.this);
pDialog.setMessage(“正在加载铃声,请稍候…”);
pDialog.setUndeterminate(假);
pDialog.setCancelable(假);
pDialog.show();
}
/**
*从url获取所有产品
* */
受保护的字符串doInBackground(字符串…args){
//建筑参数
List params=new ArrayList();
//从URL获取JSON字符串
JSONObject json=jParser.makeHttpRequest(url_all_products,“GET”,params);
//检查日志cat中的JSON响应
Log.d(“所有产品:,json.toString());
试一试{
//检查成功标签
int success=json.getInt(TAG_success);
如果(成功==1){
//发现的产品
//获取一系列产品
products=json.getJSONArray(TAG_products);
//在所有产品中循环
对于(int i=0;ivalue
地图放置(标签PID,id);
地图放置(标签名称、名称);
//将哈希列表添加到ArrayList
productsList.add(地图);
}
}否则{
//没有发现任何产品
//启动添加新产品活动
//意图i=新意图(getApplicationContext(),
//NewProductActivity.class);
//关闭以前的所有活动
//i、 a