新浪微博 AbsListView.obtainView调用关系

日前遇到Bug，出现

09-01 16:26:42.916 15952 15952 E AndroidRuntime: FATAL EXCEPTION: main
09-01 16:26:42.916 15952 15952 E AndroidRuntime: Process: com.sina.weibo, PID: 15952
09-01 16:26:42.916 15952 15952 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setDrawingCacheBackgroundColor(int)' on a null object reference
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.widget.AbsListView.obtainView(AbsListView.java:2360)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.widget.ListView.makeAndAddView(ListView.java:1882)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.widget.ListView.fillDown(ListView.java:704)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.widget.ListView.fillSpecific(ListView.java:1362)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.widget.ListView.layoutChildren(ListView.java:1669)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.widget.AbsListView.onLayout(AbsListView.java:2151)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.view.View.layout(View.java:15686)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.view.ViewGroup.layout(ViewGroup.java:5107)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at com.sina.weibo.view.PullDownView.onLayout(PullDownView.java:676)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.view.View.layout(View.java:15686)
09-01 16:26:42.916 15952 15952 E AndroidRuntime:
at android.view.ViewGroup.layout(ViewGroup.java:5107)

这里很明确，是

AbsListView中的obtainView函数报错；

这个函数里面有一句代码

final View child = mAdapter.getView(position, scrapView, this);

因为mAdapter的继承者过多，最后找到新浪微波是调用HeaderViewListAdapter.java中的

public View getView(int position, View convertView, ViewGroup parent) {
Log.d("stl","HVLA getView");
// Header (negative positions will throw an IndexOutOfBoundsException)
int numHeaders = getHeadersCount();
if (position < numHeaders) {
return mHeaderViewInfos.get(position).view;
}
// Adapter
final int adjPosition = position - numHeaders;
int adapterCount = 0;
if (mAdapter != null) {
adapterCount = mAdapter.getCount();
if (adjPosition < adapterCount) {
return mAdapter.getView(adjPosition, convertView, parent);
}
}
// Footer (off-limits positions will throw an IndexOutOfBoundsException)
return mFooterViewInfos.get(adjPosition - adapterCount).view;
}

最后

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