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我寫了一個android應用程序，它在特定情況下崩潰。然而，因爲我對android不是很有經驗，所以我不清楚我必須做什麼（儘管棧跟蹤看起來非常清晰）。我的應用程序只在描述的情況下崩潰：java.lang.IllegalStateException後臺線程更新列表視圖
所以這就是發生了什麼：我的應用程序正在運行，手機被喚醒。大約5分鐘後，通過觸摸設備不動作，手機進入睡眠狀態並關閉屏幕。當我現在嘗試再次喚醒手機時，手機會再次顯示我的應用程序屏幕。但是，在2秒左右之後，我收到了我的應用程序崩潰並需要系統停止的信息。
原因是，一個列表視圖適配器（所以我認爲）嘗試更新列表視圖，但不是從主要的UI線程內。這裏是堆棧跟蹤：
10-20 23:32:04.290: W/System.err(8276): java.net.UnknownHostException: www.example.de
10-20 23:32:04.330: W/System.err(8276): java.net.UnknownHostException: www.example.de
10-20 23:32:04.330: W/System.err(8276): at java.net.InetAddress.lookupHostByName(InetAddress.java:499)
10-20 23:32:04.330: W/System.err(8276): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:296)
10-20 23:32:04.330: W/System.err(8276): at java.net.InetAddress.getAllByName(InetAddress.java:258)
10-20 23:32:04.330: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
10-20 23:32:04.330: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
10-20 23:32:04.330: W/System.err(8276): at java.net.InetAddress.lookupHostByName(InetAddress.java:499)
10-20 23:32:04.330: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
10-20 23:32:04.330: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
10-20 23:32:04.330: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
10-20 23:32:04.330: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
10-20 23:32:04.340: W/System.err(8276): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:296)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.https.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:406)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.https.HttpsURLConnectionImpl$HttpsEngine.makeConnection(HttpsURLConnectionImpl.java:387)
10-20 23:32:04.350: W/System.err(8276): at java.net.InetAddress.getAllByName(InetAddress.java:258)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.retrieveResponse(HttpURLConnectionImpl.java:1021)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:512)
10-20 23:32:04.350: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:258)
10-20 23:32:04.350: W/System.err(8276): at de.example.logic.DataLoader.getJSONFromUrl(DataLoader.java:89)
10-20 23:32:04.350: W/System.err(8276): at de.example.logic.DataLoader.doInBackground(DataLoader.java:68)
10-20 23:32:04.350: W/System.err(8276): at de.example.logic.DataLoader.doInBackground(DataLoader.java:1)
10-20 23:32:04.350: W/System.err(8276): at android.os.AsyncTask$2.call(AsyncTask.java:185)
10-20 23:32:04.360: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
10-20 23:32:04.360: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
10-20 23:32:04.360: W/System.err(8276): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
10-20 23:32:04.360: W/System.err(8276): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
10-20 23:32:04.360: W/System.err(8276): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
10-20 23:32:04.360: W/System.err(8276): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:205)
10-20 23:32:04.360: W/System.err(8276): at de.example.logic.RemoteLogging.doInBackground(RemoteLogging.java:119)
10-20 23:32:04.360: W/System.err(8276): at de.example.logic.RemoteLogging.doInBackground(RemoteLogging.java:1)
10-20 23:32:04.360: W/System.err(8276): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
10-20 23:32:04.360: W/System.err(8276): at android.os.AsyncTask$2.call(AsyncTask.java:185)
10-20 23:32:04.360: W/System.err(8276): at java.lang.Thread.run(Thread.java:1019)
10-20 23:32:04.370: W/System.err(8276): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
10-20 23:32:04.370: W/System.err(8276): java.lang.NullPointerException
10-20 23:32:04.370: W/System.err(8276): at de.example.logic.JSONData.createObjectsFromJSON(JSONData.java:57)
10-20 23:32:04.370: W/System.err(8276): at de.example.logic.JSONData.updateViews(JSONData.java:34)
10-20 23:32:04.370: W/System.err(8276): at de.example.logic.DataLoader.onPostExecute(DataLoader.java:108)
10-20 23:32:04.370: W/System.err(8276): at de.example.logic.DataLoader.onPostExecute(DataLoader.java:1)
10-20 23:32:04.370: W/System.err(8276): at android.os.AsyncTask.finish(AsyncTask.java:417)
10-20 23:32:04.370: W/System.err(8276): at android.os.AsyncTask.access$300(AsyncTask.java:127)
10-20 23:32:04.370: W/System.err(8276): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
10-20 23:32:04.370: W/System.err(8276): at android.os.Handler.dispatchMessage(Handler.java:99)
10-20 23:32:04.370: W/System.err(8276): at android.os.Looper.loop(Looper.java:130)
10-20 23:32:04.370: W/System.err(8276): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-20 23:32:04.370: W/System.err(8276): at java.lang.reflect.Method.invokeNative(Native Method)
10-20 23:32:04.370: W/System.err(8276): at java.lang.reflect.Method.invoke(Method.java:507)
10-20 23:32:04.370: W/System.err(8276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
10-20 23:32:04.370: W/System.err(8276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
10-20 23:32:04.370: W/System.err(8276): at dalvik.system.NativeStart.main(Native Method)
10-20 23:32:04.370: W/System.err(8276): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
10-20 23:32:04.370: W/System.err(8276): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
10-20 23:32:04.370: W/System.err(8276): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
10-20 23:32:04.380: W/System.err(8276): at java.lang.Thread.run(Thread.java:1019)
10-20 23:32:06.350: W/dalvikvm(8276): threadid=1: thread exiting with uncaught exception (group=0x401e9560)
10-20 23:32:06.350: E/AndroidRuntime(8276): FATAL EXCEPTION: main
10-20 23:32:06.350: E/AndroidRuntime(8276): java.lang.IllegalStateException: The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131230724, class eu.erikw.PullToRefreshListView) with Adapter(class android.widget.HeaderViewListAdapter)]
10-20 23:32:06.350: E/AndroidRuntime(8276): at android.widget.ListView.layoutChildren(ListView.java:1510)
10-20 23:32:06.350: E/AndroidRuntime(8276): at android.widget.AbsListView$CheckForTap.run(AbsListView.java:2005)
10-20 23:32:06.350: E/AndroidRuntime(8276): at android.os.Handler.handleCallback(Handler.java:587)
10-20 23:32:06.350: E/AndroidRuntime(8276): at android.os.Handler.dispatchMessage(Handler.java:92)
10-20 23:32:06.350: E/AndroidRuntime(8276): at android.os.Looper.loop(Looper.java:130)
10-20 23:32:06.350: E/AndroidRuntime(8276): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-20 23:32:06.350: E/AndroidRuntime(8276): at java.lang.reflect.Method.invokeNative(Native Method)
10-20 23:32:06.350: E/AndroidRuntime(8276): at java.lang.reflect.Method.invoke(Method.java:507)
10-20 23:32:06.350: E/AndroidRuntime(8276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
10-20 23:32:06.350: E/AndroidRuntime(8276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
10-20 23:32:06.350: E/AndroidRuntime(8276): at dalvik.system.NativeStart.main(Native Method)
特別
java.lang.IllegalStateException：適配器的內容發生了變化，但ListView控件沒有收到通知。確保適配器的內容不會從後臺線程修改，而只能從UI線程修改。 [在ListView（2131230724，類eu.erikw.PullToRefreshListView）與適配器（類android.widget.HeaderViewListAdapter）]
儘管錯誤消息是相當詳細的，我仍然不知道我需要做什麼？誰能幫我？
編輯：eu.erikw.PullToRefreshListView的代碼是要長的張貼在這裏在stackoverflow。但你從這裏得到的代碼（這是一個sinlge文件）：https://github.com/erikwt/PullToRefresh-ListView/blob/master/libraryproject/src/eu/erikw/PullToRefreshListView.java
編輯2：我知道現在它崩潰的地方。看看下面的代碼
public class PullToRefreshListView extends ListView{
...other code...
// It crashes in this method
@Override
public boolean onTouchEvent(MotionEvent event){
Log.d("pull2refresh","onTouchEvent");
// it also crashes although I make this check
if(!( Looper.getMainLooper().equals(Looper.myLooper())))
return true;
if(lockScrollWhileRefreshing
&& (state == State.REFRESHING || getAnimation() != null && !getAnimation().hasEnded())){
return true;
... other code in this method...
return super.onTouchEvent(event); <-- it crashes exactly here at the end of the whole method
}
正如你可以看到，它崩潰，雖然我檢查，如果我在主要的UI線程。因爲這個類擴展了一個listview，所以它不能實現可運行的方法。所以，由於你的建議不適用，我還能做什麼？
當您修改適配器的內容而不調用'notifyDataSetChanged（）'時，會發生這種情況。 – GVillani82