主activity   報空指標異常

java.lang.RuntimeException: Unable to resume activity {com.click369.test/com.click369.test.jzactivity.TallyToolActivity}: java.lang.NullPointerException

問題原因是

setAdapter(asapter);為空     有一種情況是id重複

主activity  包含的fragment的listview為空導致

原被 包含的fragment的onCreateView程式碼

public class RuzhangFragment extends Fragment{
private ListView rulistView1 = null;//收入介面的listview
private List<RuZhang> ruzhanglist = null;// 記錄訊息集合

public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {

View ruzhangView=inflater.inflate(R.layout.ruzhanglist_layout, null, false);
return ruzhangView;

}

}

修改後    

public class RuzhangFragment extends Fragment{

private ListView rulistView1 = null;//收入介面的listview
private List<RuZhang> ruzhanglist = null;// 記錄訊息集合

public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View ruzhangView=inflater.inflate(R.layout.ruzhanglist_layout, null, false);
//進入之後顯示收入賬單 有內容顯示的Listview。
rulistView1=(ListView)ruzhangView.findViewById(R.id.rulistView1);
return ruzhangView;
}

}