-2

当我运行我的模拟器时，它只是强制关闭这里是 logcat 显示......

07-16 03:12:30.536: D/AndroidRuntime(386): Shutting down VM
07-16 03:12:30.536: W/dalvikvm(386): threadid=1: thread exiting with uncaught exception             (group=0x4001d800)
07-16 03:12:30.556: E/AndroidRuntime(386): FATAL EXCEPTION: main
07-16 03:12:30.556: E/AndroidRuntime(386): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.database_demo/com.database_demo.Database_demo}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.ActivityThread.access$2300(ActivityThread.java:125)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.os.Handler.dispatchMessage(Handler.java:99)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.os.Looper.loop(Looper.java:123)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.ActivityThread.main(ActivityThread.java:4627)
07-16 03:12:30.556: E/AndroidRuntime(386):  at java.lang.reflect.Method.invokeNative(Native Method)
07-16 03:12:30.556: E/AndroidRuntime(386):  at java.lang.reflect.Method.invoke(Method.java:521)
07-16 03:12:30.556: E/AndroidRuntime(386):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-16 03:12:30.556: E/AndroidRuntime(386):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-16 03:12:30.556: E/AndroidRuntime(386):  at dalvik.system.NativeStart.main(Native Method)
07-16 03:12:30.556: E/AndroidRuntime(386): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.ListActivity.onContentChanged(ListActivity.java:245)
07-16 03:12:30.556: E/AndroidRuntime(386):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:201)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.Activity.setContentView(Activity.java:1647)
07-16 03:12:30.556: E/AndroidRuntime(386):  at com.database_demo.Database_demo.onCreate(Database_demo.java:40)
07-16 03:12:30.556: E/AndroidRuntime(386):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-16 03:12:30.556: E/AndroidRuntime(386):  at         android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
07-16 03:12:30.556: E/AndroidRuntime(386):  ... 11 more

我的java代码

package com.database_demo;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.net.ParseException;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class Database_demo extends ListActivity {
ListView list;
List<String> items = new ArrayList<String>();
String result = null;
InputStream is = null;;
StringBuilder sb = null;
ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.main);

    list = (ListView)findViewById(R.id.listView1);



    items.add("Employ");

    try{

    //http post
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://192.168.0.2/ListView/wa.php");
    List<NameValuePair> nameValue=new ArrayList<NameValuePair>();
    httppost.setEntity(new UrlEncodedFormEntity(nameValue));
    HttpResponse response = httpclient.execute(httppost);
    HttpEntity entity = response.getEntity();
    is = entity.getContent();
    }
    catch(Exception e){
        Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
   }

    //Convert response to string  
    try
    {
      BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF-8"));

      sb = new StringBuilder();

      String line = null;

      while ((line = reader.readLine()) != null) 
      {
         sb.append(line + "\n");
      }

      is.close();

      result = sb.toString();
    }
    catch(Exception e)
    {
        Toast.makeText(getBaseContext(),e.toString() ,Toast.LENGTH_LONG).show();
    }
    //END Convert response to string  
    String Cat;
    try{
            JSONArray jArray = new JSONArray(result);
            JSONObject json_data=null;
            for(int i=0;i<jArray.length();i++)
            {
               json_data = jArray.getJSONObject(i);
               Cat=json_data.getString("category");
               items.add("Category: " + Cat);
           }
        setupList();
        }
        catch(JSONException e1){
            Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
        } catch (ParseException e1) {
            Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
    }

}
private void setupList(){
    list.setAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, items));
}
}

你能帮我解决这个问题吗？

4

4 回答 4

1

原因：java.lang.RuntimeException：您的内容必须有一个 id 属性为 'android.R.id.list' 的 ListView

<ListView
 android:id="@android:id/list" // must be there is xml

http://developer.android.com/reference/android/app/ListActivity.html

ListActivity具有默认布局，由屏幕中央的单个全屏列表组成。setContentView()但是，如果您愿意，您可以通过使用in设置您自己的视图布局来自定义屏幕布局onCreate()。为此，您自己的视图必须包含一个ListViewid 为 " @android:id/list"的对象（如果它在代码中，则为列表）

于 2013-07-15T12:20:52.157 回答
0

更改此行：

list = (ListView)findViewById(R.id.listView1);

至

list = getListView();

//或者写

ListView list = (ListView)findViewById(android.R.id.list);

并在您的布局 XML中使用 listView id

android:id="@android:id/list"
于 2013-07-15T12:24:17.140 回答
0

您正在扩展 ListActivity。这意味着布局 main.xml 必须包含带有 android:id="@android:id/list" 的列表视图

于 2013-07-15T12:21:05.690 回答
0

您需要使用列表视图的xml

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

由于您使用的是 ListActivity，因此您的 xml 文件必须在提及 ID 时指定关键字 android。

如果你需要一个自定义的 ListView，而不是扩展一个 ListActivity，你必须简单地扩展一个 Activity，并且应该具有相同的 id 而没有关键字 android。

于 2013-07-15T12:23:26.630 回答