崩溃：android.widget.ListView.layoutChildren中的java.lang.IllegalStateException

Question

我在无法复制的产品中崩溃了。跟踪没有说明崩溃的位置。进行一些搜索后，看起来它可能与notifyDataSetChanged（）有关。它发生在Android 6和7上。

我有2个使用listview的软件包：

BroadcastReceiver检查wifi AP的列表：在这种情况下，代码将收集所有AP，将它们添加到List中并调用notifyDataSetChanged：

 @Override
    public void onReceive(Context context, Intent intent) {
        if (wifiManager != null) {
            if (wifiManager.isWifiEnabled()) {
                List<ScanResult> listeScan = wifiManager.getScanResults();
                listeWifiItem.clear();
                for (ScanResult scanResult : listeScan) {
                    WifiItem item = new WifiItem();

                    item.setAdresseMac(scanResult.BSSID);
                    item.setAPName(scanResult.SSID);
                    item.setForceSignal(scanResult.level);

                    listeWifiItem.add(item);
                }

                wifiAdapter.notifyDataSetChanged();
            } else {
                Toast.makeText(context, "You must activate the WiFi", Toast.LENGTH_SHORT);
            }
        }
    }

还有一个异步任务，其中我在onPostExecute方法中调用notifyDataSetChanged：

@Override
protected void onPostExecute(Void result) {
    iPadaptater.notifyDataSetChanged();
    super.onPostExecute(result);
}

我使用notifyDataSetChanged的方式是否有问题？在异步任务中，如果用户转到其他功能，我认为这样做更安全

您是否认为崩溃与notifyDataSetChanged有关？

您是否从痕迹中看到另一个重要信息？

这是两种跟踪类型：

类型1：

  java.lang.IllegalStateException: 
      at android.widget.ListView.layoutChildren (ListView.java:1747)
      at android.widget.AbsListView$CheckForTap.run (AbsListView.java:4728)
      at android.os.Handler.handleCallback (Handler.java:751)
      at android.os.Handler.dispatchMessage (Handler.java:95)
      at android.os.Looper.loop (Looper.java:154)
      at android.app.ActivityThread.main (ActivityThread.java:6776)
      at java.lang.reflect.Method.invoke (Native Method)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:1520)
      at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1410)

类型2：

java.lang.IllegalStateException: 
  at android.widget.ListView.layoutChildren (ListView.java:1623)
  at android.widget.AbsListView.onTouchUp (AbsListView.java:4210)
  at android.widget.AbsListView.onTouchEvent (AbsListView.java:3969)
  at android.view.View.dispatchTouchEvent (View.java:9957)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2705)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2386)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at android.view.ViewGroup.dispatchTransformedTouchEvent (ViewGroup.java:2711)
  at android.view.ViewGroup.dispatchTouchEvent (ViewGroup.java:2400)
  at com.android.internal.policy.DecorView.superDispatchTouchEvent (DecorView.java:416)
  at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent (PhoneWindow.java:1837)
  at android.app.Activity.dispatchTouchEvent (Activity.java:3154)
  at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent (WindowCallbackWrapper.java:63)
  at com.android.internal.policy.DecorView.dispatchTouchEvent (DecorView.java:378)
  at android.view.View.dispatchPointerEvent (View.java:10177)
  at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent (ViewRootImpl.java:4634)
  at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess (ViewRootImpl.java:4502)
  at android.view.ViewRootImpl$InputStage.deliver (ViewRootImpl.java:3953)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext (ViewRootImpl.java:4006)
  at android.view.ViewRootImpl$InputStage.forward (ViewRootImpl.java:3972)
  at android.view.ViewRootImpl$InputStage.apply (ViewRootImpl.java:3980)
  at android.view.ViewRootImpl$InputStage.deliver (ViewRootImpl.java:3953)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext (ViewRootImpl.java:4006)
  at android.view.ViewRootImpl$InputStage.forward (ViewRootImpl.java:3972)
  at android.view.ViewRootImpl$AsyncInputStage.forward (ViewRootImpl.java:4101)
  at android.view.ViewRootImpl$InputStage.apply (ViewRootImpl.java:3980)
  at android.view.ViewRootImpl$AsyncInputStage.apply (ViewRootImpl.java:4158)
  at android.view.ViewRootImpl$InputStage.deliver (ViewRootImpl.java:3953)
  at android.view.ViewRootImpl$InputStage.onDeliverToNext (ViewRootImpl.java:4006)
  at android.view.ViewRootImpl$InputStage.forward (ViewRootImpl.java:3972)
  at android.view.ViewRootImpl$InputStage.apply (ViewRootImpl.java:3980)
  at android.view.ViewRootImpl$InputStage.deliver (ViewRootImpl.java:3953)
  at android.view.ViewRootImpl.deliverInputEvent (ViewRootImpl.java:6443)
  at android.view.ViewRootImpl.doProcessInputEvents (ViewRootImpl.java:6417)
  at android.view.ViewRootImpl.enqueueInputEvent (ViewRootImpl.java:6378)
  at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent (ViewRootImpl.java:6577)
  at android.view.InputEventReceiver.dispatchInputEvent (InputEventReceiver.java:185)
  at android.os.MessageQueue.nativePollOnce (Native Method)
  at android.os.MessageQueue.next (MessageQueue.java:323)
  at android.os.Looper.loop (Looper.java:136)
  at android.app.ActivityThread.main (ActivityThread.java:6311)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run (ZygoteInit.java:872)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:762)

Answer 1

查看 API 25 的源代码，唯一抛出非法状态异常的地方是LayoutChildren()of ListView。代码中的异常状态：

摘自ListView$LayoutChildren：

// Handle the empty set by removing all views that are visible
// and calling it a day
if (mItemCount == 0) {
    resetList();
    invokeOnItemScrollListener();
    return;
} else if (mItemCount != mAdapter.getCount()) {
    throw new 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. Make sure your adapter calls notifyDataSetChanged() "
            + "when its content changes. [in ListView(" + getId() + ", " + getClass()
            + ") with Adapter(" + mAdapter.getClass() + ")]");
}

这表明ListView由适配器维护的内部项目计数与由适配器维护的项目计数不匹配。看起来LayoutChildren可能是从 的CheckforTap内部类调用的AbsListView：

摘自AbsListView$CheckforTap：

if (!mDataChanged) {
    final float[] point = mTmpPoint;
    point[0] = x;
    point[1] = y;
    transformPointToViewLocal(point, child);
    child.drawableHotspotChanged(point[0], point[1]);
    child.setPressed(true);
    setPressed(true);
    layoutChildren();
    // ... and it continues...

这可能就是为什么其他人会问您是否要从非 UI 线程更改数据集。这似乎也表明您的调用方式存在潜在问题notifyDataSetChanged()。

假设您使用 UI 线程进行更改，并且不了解应用程序的内部工作原理，我只能建议您不要将调用与notifyDataSetChanged()您所做的更改分开。从您的回复中您似乎是这样做的。