您好，我从事这个项目已经有一段时间了，目前非常卡住，我还是 Android 新手，并且一直在开发我的第一个应用程序，该应用程序从我使用 MediaWiki API 创建的 XML 文件中提取信息。每次我尝试在我的应用程序上选择“播放器”选项卡时，它都会强制关闭，我不知道为什么。这是我的玩家活动和 Wikiparser 活动的代码：
package com.lvlup.kikurself.scotttest;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.AdapterView.OnItemClickListener;
import java.io.IOException;
import org.xml.sax.SAXException;
//import com.lvlup.kikurself.scotttest.WikiParser.Cm;
public class scottPlayers extends ListActivity {
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
WikiParser p = new WikiParser();
ArrayList<String> titles = new ArrayList<String>();
try {
p.parseInto(new URL("http://scottlandminecraft.wikia.com/api.php?action=query&list=categorymembers&cmtitle=Category:Players&cmlimit=500&format=xml"), titles);
} catch (MalformedURLException e) {
} catch (IOException e) {
} catch (SAXException e) {}
//String[] values = new String[50];
//values = res;
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, titles);
setListAdapter(adapter);
final ListView playersList = getListView();
playersList.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long thisID)
{
Object o = (playersList.getItemAtPosition(position));
String playerName_temp = (o.toString());
Intent newIntent = new Intent(v.getContext(), playerDisp.class);
newIntent.putExtra("tempN", playerName_temp);
startActivity(newIntent);
}
});
//get your data back again with: String fName = getIntent().getExtras().getInt("fname");
}}
接下来是 WikiParser 函数的代码：
package com.lvlup.kikurself.scotttest;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import android.sax.*;
import android.text.TextUtils;
import android.util.Xml;
import android.util.Xml.Encoding;
public class WikiParser {
private static class CmListener implements StartElementListener {
final List<String> mTitles;
CmListener(List<String> titles) {
mTitles = titles;
}
@Override
public void start(Attributes attributes) {
String title = attributes.getValue("", "title");
if (!TextUtils.isEmpty(title)) {
mTitles.add(title);
}
}
}
public void parseInto(URL url, List<String> titles) throws IOException, SAXException {
HttpURLConnection con = (HttpURLConnection) url.openConnection();
try {
parseInto(new BufferedInputStream(con.getInputStream()), titles);
} finally {
con.disconnect();
}
}
public void parseInto(InputStream docStream, List<String> titles) throws IOException, SAXException {
RootElement api = new RootElement("api");
Element query = api.requireChild("query");
Element categoryMembers = query.requireChild("categorymembers");
Element cm = categoryMembers.requireChild("cm");
cm.setStartElementListener(new CmListener(titles));
Xml.parse(docStream, Encoding.UTF_8, api.getContentHandler());
}
}
就是这样......我在这里学习我的错误，所以任何人都可以告诉我我的代码以及我可以做些什么来改进，如果有人知道出了什么问题，提前谢谢你。
编辑：也包括 LogCat，谢谢。
08-06 04:33:58.837: D/dalvikvm(539): GC_FOR_ALLOC freed 62K, 3% free 9883K/10179K, paused 64ms
08-06 04:33:58.917: I/dalvikvm-heap(539): Grow heap (frag case) to 13.641MB for 4096016-byte allocation
08-06 04:33:59.037: D/dalvikvm(539): GC_CONCURRENT freed <1K, 3% free 13882K/14215K, paused 12ms+17ms
08-06 04:33:59.748: D/gralloc_goldfish(539): Emulator without GPU emulation detected.
08-06 04:34:05.977: D/AndroidRuntime(539): Shutting down VM
08-06 04:34:05.987: W/dalvikvm(539): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
08-06 04:34:06.067: E/AndroidRuntime(539): FATAL EXCEPTION: main
08-06 04:34:06.067: E/AndroidRuntime(539): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.lvlup.kikurself.scotttest/com.lvlup.kikurself.scotttest.scottPlayers}: android.os.NetworkOnMainThreadException
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.ActivityThread.access$600(ActivityThread.java:122)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.os.Handler.dispatchMessage(Handler.java:99)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.os.Looper.loop(Looper.java:137)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.ActivityThread.main(ActivityThread.java:4340)
08-06 04:34:06.067: E/AndroidRuntime(539): at java.lang.reflect.Method.invokeNative(Native Method)
08-06 04:34:06.067: E/AndroidRuntime(539): at java.lang.reflect.Method.invoke(Method.java:511)
08-06 04:34:06.067: E/AndroidRuntime(539): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-06 04:34:06.067: E/AndroidRuntime(539): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-06 04:34:06.067: E/AndroidRuntime(539): at dalvik.system.NativeStart.main(Native Method)
08-06 04:34:06.067: E/AndroidRuntime(539): Caused by: android.os.NetworkOnMainThreadException
08-06 04:34:06.067: E/AndroidRuntime(539): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084)
08-06 04:34:06.067: E/AndroidRuntime(539): at java.net.InetAddress.lookupHostByName(InetAddress.java:391)
08-06 04:34:06.067: E/AndroidRuntime(539): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242)
08-06 04:34:06.067: E/AndroidRuntime(539): at java.net.InetAddress.getAllByName(InetAddress.java:220)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:71)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpEngine.connect(HttpEngine.java:303)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
08-06 04:34:06.067: E/AndroidRuntime(539): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
08-06 04:34:06.067: E/AndroidRuntime(539): at com.lvlup.kikurself.scotttest.WikiParser.parseInto(WikiParser.java:35)
08-06 04:34:06.067: E/AndroidRuntime(539): at com.lvlup.kikurself.scotttest.scottPlayers.onCreate(scottPlayers.java:29)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.Activity.performCreate(Activity.java:4465)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-06 04:34:06.067: E/AndroidRuntime(539): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
08-06 04:34:06.067: E/AndroidRuntime(539): ... 11 more