强制关闭的ListView在Android的
,当我跑我的模拟器,它只是强制关闭这里是logcat的节目......强制关闭的ListView在Android的
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));
}
}
你能帮助我这个?
产生的原因:了java.lang.RuntimeException:您的内容必须有一个 的ListView其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
有一个默认布局,其中包含屏幕*的单个全屏列表。但是,如果您愿意,您可以通过onCreate()
中的setContentView()
设置您自己的视图布局来自定义屏幕布局。要做到这一点,自己的观点必须包含id为“@android:id/list
”(或列表,如果它在代码)
tanx它帮助了我,但是我没有看到数据,这里是logcat说'07-16 03:35:33.409:I/global(335) :BufferedReader构造函数中使用的默认缓冲区大小。如果需要8k字符的缓冲区,那么最好是明确的。# –
@Ørly似乎有很多错误。您在ui线程上执行网络相关的操作,因为它不可能贴在蜂窝上。你应该使用一个线程或asynctask – Raghunandan
我该如何使用它? –
你是在扩展ListActivity一个ListView
对象。这意味着,布局main.xml中必须包含与Android的ListView:ID = “@机器人:ID /列表”
tanx它帮了我,但我没有看到数据,这里是logcat说'07-16 03:35:33.409:I/global(335):在BufferedReader构造函数中使用的默认缓冲区大小。如果需要8k字符的缓冲区,最好是明确的。' –
您需要使用列表视图
<ListView android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
的XML由于您使用ListActivity你的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,那么不必扩展一个ListActivity,你只需要扩展一个Activity并且应该有没有关键字android的相同id。
tanx它帮了我,但我没有看到数据,这里是logcat说'07-16 03:35:33.409:I/global(335) :BufferedReader构造函数中使用的默认缓冲区大小。如果需要一个8k字符的缓冲区,最好是明确的。' –
改变这一行:
list = (ListView)findViewById(R.id.listView1);
到
list = getListView();
//或写
ListView list = (ListView)findViewById(android.R.id.list);
,并在您布局XML为ListView ID使用
android:id="@android:id/list"
tanx它帮助我,但是我没有看到数据,这里是logcat说 '07-16 03:35:33.409:I/global( 335):BufferedReader构造函数中使用的默认缓冲区大小。如果需要8k字符的缓冲区,那么最好是明确的。 ' –
里面'R.layout.main'你必须declara ID为一个ListView'@android:ID/list' – Blackbelt
坦它帮助我,但我没有看到DATAS但这里是logcat的说'07 -16 03:35:33.409:I/global(335):在BufferedReader构造函数中使用的默认缓冲区大小。如果需要一个8k字符的缓冲区,最好是明确的。 –