我有一个适配器,它是一个嵌套类:的ListView IllegalStateException异常 - 基于适配器
protected abstract class MyAdapter extends BaseAdapter {
private Context context;
private Data[] data;
protected MyAdapter(Context context) {
this.context = context;
}
public void setData(Data[] data) {
this.data = data;
}
@Override
public int getCount() {
return data == null || data.length == 0 ? 0 : data.length * 2;
}
@Override
public Object getItem(int i) {
return data == null ? null : data[i/2];
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
...
}
///other methods not modifying data[]
}
我使用使用setData(数据[]数据)只在一个地方:
public void setNewData(Data[] data) {
if (!Arrays.deepEquals(myAdapter.data, data)) {
myAdapter.setData(data);
myAdapter.notifyDataSetChanged();
}
updateVisibility();
}
并获得了变量在一个地方:
protected void updateVisibility() {
Data[] localData = myAdapter.data;
if (localData != null && localData.length > 0) {
//do smth not related to localData[]
}
}
在谷歌玩我看到的用户收到此错误:
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(2131427598, class android.widget.ListView) with Adapter]
at android.widget.ListView.layoutChildren(ListView.java:1544)
at android.widget.AbsListView.onTouchEvent(AbsListView.java:4141)
at android.view.View.dispatchTouchEvent(View.java:7350)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2464)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2197)
但无法理解它来自哪里。
增加:
我认为这里的原因是:
在子类我重写getCount将()方法,并返回基于取向不同的数字。
@Override
public int getCount() {
int count = super.getCount();
if (isPortrait(context.getResources())) {
count++;
}
return count;
}
我认为我应该在这里更新listView的缓存项目数。 你觉得呢?我对吗?
当你更新你的适配器添加一行'notifydatasetchanged(适配器);'它的发生,因为你的适配器中的数据已被修改,但没有通知 –
你可以看到我设置数据后调用notifydatasetchanged() – TpoM6oH