我有一个适配器,它是一个嵌套类:
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[]
}
我只在一个地方使用setData(Data []数据):
public void setNewData(Data[] data) {
if (!Arrays.deepEquals(myAdapter.data, data)) {
myAdapter.setData(data);
myAdapter.notifyDataSetChanged();
}
updateVisibility();
}
在一个地方访问变量:
protected void updateVisibility() {
Data[] localData = myAdapter.data;
if (localData != null && localData.length > 0) {
//do smth not related to localData[]
}
}
在谷歌播放中,我看到用户收到此错误:
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)
但无法理解它来自何处。
增加:
我认为这就是原因:
在子类中,我重写了getCount()方法,并根据方向返回不同的数字。
@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的缓存项目计数。 你怎么看?我是对的吗?
答案 0 :(得分:2)
您确定在其他任何地方都不使用data
setNewData
数组吗?也许你重用这个数组并以某种方式更新它?当listView的项目内部listView的项目计数不等于适配器的getCount
时,抛出此异常。重新检查您的代码。
答案 1 :(得分:0)
你在哪里调用setNewData?
如果在初始化适配器后调用它,请调用
http://developer.android.com/reference/android/widget/BaseAdapter.html#notifyDataSetChanged()