2
我有一個佈局，我試圖設置由三個不同的佈局合併爲一個。我有兩個RelativeLayouts作爲前兩個項目和一個列表適配器作爲第三個。使用MergeAdapter的原因是因爲我希望整個頁面滾動，但我希望整個佈局中的第二個總項目（第二個RelativeLayout）能夠保持頂部。所以我試圖用StickyListHeaders Library來完成它。StickyListHeaders和MergeAdapter
它似乎並沒有被廣泛使用，儘管它的想法很棒。無論如何，我必須在我的列表適配器中重寫兩個方法，在這種情況下，它是一個MergeAdapter。我不斷收到一個NullPointerException異常，但它並沒有告訴我在我的代碼中發生了什麼。因此，如果任何人有使用該庫的經驗，並且更具體地使用帶有MergeAdapter的庫，你能告訴我我做錯了什麼嗎？這是我的MergeAdapter的代碼。
private class ProfileMergeAdapter extends MergeAdapter implements StickyListHeadersAdapter{
@Override
public View getHeaderView(int position, View convertView, ViewGroup parent) {
LayoutInflater nameInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = (RelativeLayout) nameInflater.inflate(R.layout.name_line, null);
profilePhotoBottom = (ImageView) convertView.findViewById(R.id.profile_pic_bottom);
TextView userName = (TextView) convertView.findViewById(R.id.userName);
userName.setText(Utility.userName);
return convertView;
}
@Override
public long getHeaderId(int position) {
return 1;
}
}
而這裏的logcat的：
01-13 20:39:21.237: W/dalvikvm(4917): threadid=1: thread exiting with uncaught exception (group=0x40de5930)
01-13 20:39:21.245: E/AndroidRuntime(4917): FATAL EXCEPTION: main
01-13 20:39:21.245: E/AndroidRuntime(4917): java.lang.NullPointerException
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:523)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.View.measure(View.java:15513)
01-13 20:39:21.245: E/AndroidRuntime(4917): at com.emilsjolander.components.stickylistheaders.StickyListHeadersListView.measureHeader(StickyListHeadersListView.java:242)
01-13 20:39:21.245: E/AndroidRuntime(4917): at com.emilsjolander.components.stickylistheaders.StickyListHeadersListView.scrollChanged(StickyListHeadersListView.java:284)
01-13 20:39:21.245: E/AndroidRuntime(4917): at com.emilsjolander.components.stickylistheaders.StickyListHeadersListView.onScroll(StickyListHeadersListView.java:269)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.widget.AbsListView.invokeOnItemScrollListener(AbsListView.java:1340)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.widget.ListView.layoutChildren(ListView.java:1753)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.widget.AbsListView.onLayout(AbsListView.java:1994)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.View.layout(View.java:14003)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.ViewGroup.layout(ViewGroup.java:4375)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.View.layout(View.java:14003)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.ViewGroup.layout(ViewGroup.java:4375)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.View.layout(View.java:14003)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.ViewGroup.layout(ViewGroup.java:4375)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.View.layout(View.java:14003)
01-13 20:39:21.245: E/AndroidRuntime(4917): at android.view.ViewGroup.layout(ViewGroup.java:4375)
嗯，我首先刪除'MergeAdapter'，看看你是否可以使用普通適配器來運行其他庫。 – CommonsWare