当我运行我的模拟器时，它只是强行关闭这里是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));
}
}
答案 0 :(得分：1)
引起：java.lang.RuntimeException：您的内容必须有 ListView的id属性为'android.R.id.list'
<ListView
android:id="@android:id/list" // must be there is xml
http://developer.android.com/reference/android/app/ListActivity.html
ListActivity的默认布局包含屏幕中央的单个全屏列表。但是，如果您愿意，可以通过在setContentView()中使用onCreate()设置自己的视图布局来自定义屏幕布局。要做到这一点，您自己的视图必须包含一个ListView对象，其ID为“@android:id/list”（如果它在代码中则列出）
答案 1 :(得分：0)
您正在扩展ListActivity。这意味着布局main.xml必须包含listview和android：id =＆＃34; @android：id / list＆＃34;
答案 2 :(得分：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"/>
由于您正在使用ListActivity，因此您的xml文件必须在提及ID时指定关键字android。
如果您需要自定义ListView，而不是扩展ListActivity，则必须简单地扩展一个Activity，并且应该具有相同的id而不包含关键字android。
答案 3 :(得分：0)
更改此行：
list = (ListView)findViewById(R.id.listView1);
到
list = getListView();
//或写
ListView list = (ListView)findViewById(android.R.id.list);
并在布局XML 中为listView id使用
android:id="@android:id/list"