我正在尝试将片段中的web服务方法调用到Android应用程序。但我得到致命异常Asynctask＃1，java.lang.RuntimeException: An error occured while executing doInBackground() error.
这是我的代码：
public class HomeFragment extends Fragment {
View v;
JSONArray android=null;
ListView list;
ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
TextView id;
TextView name;
TextView price;
ConnectionTask mConTask = null;
ProgressDialog progressDialog = null;
JsonCreator jsonCreator = new JsonCreator();
private static String url = "http://api.learn2crack.com/android/jsonos/";
private static final String TAG_OS = "android";
private static final String TAG_VER = "ver";
private static final String TAG_NAME = "name";
private static final String TAG_API = "api";
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
oslist = new ArrayList<HashMap<String, String>>();
new ConnectionTask().execute();
}
public HomeFragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState)
{
v = inflater.inflate(R.layout.fragment_home, container, false);
return v;
}
public class ConnectionTask extends AsyncTask<String, String, JSONObject>{
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
id = (TextView)v.findViewById(R.id.id);
name = (TextView)v.findViewById(R.id.name);
price = (TextView)v.findViewById(R.id.price);
progressDialog = ProgressDialog.show(getActivity(), "", "Yükleniyor... ",true ,true);
}
@Override
protected JSONObject doInBackground(String... params) {
JSONParser jParser = new JSONParser();
JSONObject json = jParser.getJSONFromUrl(url);
return json;
}
@Override
protected void onPostExecute( JSONObject json) {
if(json == null){
//İnternet kontrolü
if(!Constants.isInternetAvailable(getActivity())){
progressDialog.dismiss();
Toast toast = Toast.makeText(getActivity(), "Lütfen internet bağlantınızı kontrol ediniz.", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
//İnternet var ise veri boş
else{
progressDialog.dismiss();
Toast toast = Toast.makeText(getActivity(), "Hiçbir veri bulunmamaktadır.", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0, 0);
toast.show();
}
}
else{
try {
// Getting JSON Array from URL
android = json.getJSONArray(TAG_OS);
for(int i = 0; i < android.length(); i++){
JSONObject c = android.getJSONObject(i);
String ver = c.getString(TAG_VER);
String name = c.getString(TAG_NAME);
String api = c.getString(TAG_API);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_VER, ver);
map.put(TAG_NAME, name);
map.put(TAG_API, api);
oslist.add(map);
list=(ListView)v.findViewById(R.id.listView1);
ListAdapter adapter = new SimpleAdapter(getActivity(), oslist,
R.layout.list_v,
new String[] { TAG_VER,TAG_NAME, TAG_API }, new int[] {
R.id.id,R.id.name, R.id.price});
list.setAdapter(adapter);
}
}
catch (JSONException e) {
e.printStackTrace();
}
}
}
@Override
protected void onCancelled() {
mConTask = null;
progressDialog.dismiss();
}
}
}
logcat输出：
04-20 20:14:49.492: E/AndroidRuntime(2144): FATAL EXCEPTION: AsyncTask #1
04-20 20:14:49.492: E/AndroidRuntime(2144): Process: info.androidhive.slidingmenu, PID: 2144
04-20 20:14:49.492: E/AndroidRuntime(2144): java.lang.RuntimeException: An error occured while executing doInBackground()
04-20 20:14:49.492: E/AndroidRuntime(2144): at android.os.AsyncTask$3.done(AsyncTask.java:300)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
04-20 20:14:49.492: E/AndroidRuntime(2144): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.lang.Thread.run(Thread.java:841)
04-20 20:14:49.492: E/AndroidRuntime(2144): Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.net.InetAddress.lookupHostByName(InetAddress.java:418)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.net.InetAddress.getAllByName(InetAddress.java:214)
04-20 20:14:49.492: E/AndroidRuntime(2144): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
04-20 20:14:49.492: E/AndroidRuntime(2144): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
04-20 20:14:49.492: E/AndroidRuntime(2144): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
04-20 20:14:49.492: E/AndroidRuntime(2144): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
04-20 20:14:49.492: E/AndroidRuntime(2144): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
04-20 20:14:49.492: E/AndroidRuntime(2144): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
04-20 20:14:49.492: E/AndroidRuntime(2144): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
04-20 20:14:49.492: E/AndroidRuntime(2144): at info.androidhive.slidingmenu.jsonlib.JSONParser.getJSONFromUrl(JSONParser.java:38)
04-20 20:14:49.492: E/AndroidRuntime(2144): at info.androidhive.slidingmenu.HomeFragment$ConnectionTask.doInBackground(HomeFragment.java:84)
04-20 20:14:49.492: E/AndroidRuntime(2144): at info.androidhive.slidingmenu.HomeFragment$ConnectionTask.doInBackground(HomeFragment.java:1)
04-20 20:14:49.492: E/AndroidRuntime(2144): at android.os.AsyncTask$2.call(AsyncTask.java:288)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-20 20:14:49.492: E/AndroidRuntime(2144): ... 4 more
04-20 20:14:49.492: E/AndroidRuntime(2144): Caused by: libcore.io.GaiException: getaddrinfo failed: EAI_NODATA (No address associated with hostname)
04-20 20:14:49.492: E/AndroidRuntime(2144): at libcore.io.Posix.getaddrinfo(Native Method)
04-20 20:14:49.492: E/AndroidRuntime(2144): at libcore.io.ForwardingOs.getaddrinfo(ForwardingOs.java:61)
04-20 20:14:49.492: E/AndroidRuntime(2144): at java.net.InetAddress.lookupHostByName(InetAddress.java:405)
04-20 20:14:49.492: E/AndroidRuntime(2144): ... 18 more
04-20 20:14:49.492: E/AndroidRuntime(2144): Caused by: libcore.io.ErrnoException: getaddrinfo failed: EACCES (Permission denied)
04-20 20:14:49.492: E/AndroidRuntime(2144): ... 21 more
04-20 20:14:49.732: E/OpenGLRenderer(2144): Getting MAX_TEXTURE_SIZE from GradienCache
04-20 20:14:49.732: E/OpenGLRenderer(2144): MAX_TEXTURE_SIZE: 16384
04-20 20:14:49.744: E/OpenGLRenderer(2144): Getting MAX_TEXTURE_SIZE from Caches::initConstraints()
04-20 20:14:49.752: E/OpenGLRenderer(2144): MAX_TEXTURE_SIZE: 16384
04-20 20:14:51.684: E/WindowManager(2144): android.view.WindowLeaked: Activity info.androidhive.slidingmenu.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{52845490 V.E..... R......D 0,0-1026,288} that was originally added here
04-20 20:14:51.684: E/WindowManager(2144): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:348)
04-20 20:14:51.684: E/WindowManager(2144): at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:248)
04-20 20:14:51.684: E/WindowManager(2144): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.Dialog.show(Dialog.java:286)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.ProgressDialog.show(ProgressDialog.java:116)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.ProgressDialog.show(ProgressDialog.java:104)
04-20 20:14:51.684: E/WindowManager(2144): at info.androidhive.slidingmenu.HomeFragment$ConnectionTask.onPreExecute(HomeFragment.java:77)
04-20 20:14:51.684: E/WindowManager(2144): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587)
04-20 20:14:51.684: E/WindowManager(2144): at android.os.AsyncTask.execute(AsyncTask.java:535)
04-20 20:14:51.684: E/WindowManager(2144): at info.androidhive.slidingmenu.HomeFragment.onActivityCreated(HomeFragment.java:53)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.Fragment.performActivityCreated(Fragment.java:1708)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:908)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.BackStackRecord.run(BackStackRecord.java:684)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.Activity.performStart(Activity.java:5240)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2168)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.ActivityThread.access$800(ActivityThread.java:135)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
04-20 20:14:51.684: E/WindowManager(2144): at android.os.Handler.dispatchMessage(Handler.java:102)
04-20 20:14:51.684: E/WindowManager(2144): at android.os.Looper.loop(Looper.java:136)
04-20 20:14:51.684: E/WindowManager(2144): at android.app.ActivityThread.main(ActivityThread.java:5017)
04-20 20:14:51.684: E/WindowManager(2144): at java.lang.reflect.Method.invokeNative(Native Method)
04-20 20:14:51.684: E/WindowManager(2144): at java.lang.reflect.Method.invoke(Method.java:515)
04-20 20:14:51.684: E/WindowManager(2144): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
04-20 20:14:51.684: E/WindowManager(2144): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
04-20 20:14:51.684: E/WindowManager(2144): at dalvik.system.NativeStart.main(Native Method)
如何解决？感谢...
答案 0 :(得分：1)
Caused by: java.lang.SecurityException: Permission denied (missing INTERNET permission?)
在manifest.xml文件中添加以下行
<uses-permission android:name="android.permission.INTERNET"></uses-permission>