android - NullPointerException error in my ListView -

I have a piece that I call ListView

One part of my code to be displayed

  Expenditure of the public square expands daily daily expansion {@ Override public void on crate (bundle saved instanestate) {super.onCreate (savedInstanceState ); LvExpenses = (ListView) getActivity (). FindViewById (android.R.id.list); Cursor expense list cursor; DBctrol DBC = New DB Control (Received Activity); Try {dbc.open (); ExpensesListCursor = dbc.list Expense (); String [] = new string [] {"description", "cost"}; List Adapter Adapter = New Acquisition (GetActivity), R.Lay Out.list_express, Exchange Listworker, New Ent [] (R.D.V.Description, R.D. tvCost}, 0); LvExpenses.setAdapter ();} Hold (SQLException e) {} dbc.close ();} @ Override Public View Creatives (LayoutInflator Influent, View Group Container, Bundle Saved InstantState) {Final View Rootview = Inflator.In Falette (R) Late expans_deli, container, false) ; Return route view;}} ** DbControl class **  
  Public class DbControl {Private SQLite database database; Private MySQLiteHelper dbHelper; Public DbControl ( Reference Reference) {dbHelper = new MySQLiteHelper ()}} Public Zero Open () throws SQLException {database = dbHelper.getWritableDatabase ();} Public Zero Closure () {dbHelper.close ();} Public cursor list expense () {Cursor cursor; cursor = database.query (MySQLiteHelper.TABLE_EXPENSES, new string [] {"id _id", "description, cost"}, "forDate = '" + + + "" ", blank, empty, empty, "Id ask"); If (cursor! = Null) {cursor.moveToFirst (); } Return cursor; }   
  expenses_daily.xml   
  & lt; LinearLayout xmlns: android = "http://schemas.android.com/ Apk / res / android" Android: Orientation = "Vertical" Android: layout_width = "match_parent" Android: layout_height = "match_parent" Android: id = "@ + ID / Lao Expense Daily "Android: Baseline Alliance =" False "& gt; & Lt; LinearLayout Android: layout_width = "fill_parent" Android: layout_height = "fill_parent" Android: Orientation = "horizontal" & gt; & Lt; ListView Android: id = "@ android: id / list" Android: layout_width = "fill_parent" android: layout_height = "wrap_content" & gt; & Lt; / ListView & gt; & Lt; / LinearLayout & gt; & Lt; / LinearLayout & gt;   
  list_expenses.xml   
  & lt; LinearLayout xmlns: android = "http://schemas.android.com/apk/Res/ android" android: orientation = "vertical" Android: layout_width = "match_parent" Android: layout_height = "match_parent" & gt; & Lt; LinearLayout Android: layout_width = "match_parent" android: layout_height = "wrap_content" android: orientation = "horizontal" Android: padding = "7dip" & gt; & Lt; TextView android: layout_width = "0dip" Android: layout_height = "wrap_content" android: layout_weight = "0.6" Android: id = "@ + id / tvDescription" /> & Lt; TextView android: layout_width = "0dip" Android: layout_height = "wrap_content" Android: layout_weight = "0.3" Android: id = "@ + id / tvCost" /> & Lt; / LinearLayout & gt; & Lt; / LinearLayout & gt;   
 But every time I load the piece, it will display this error  
  Fatal exception: main java.lang.NullPointerException com.code Imin.mymoneymanaged at Expense Daily Contatt (expans deli. Java: 60)   
 indicates the row  
  lvExpenses.setAdapter (class) in Class Expex daily  < / Pre>  
 
 
  lvExpenses = (list view) getActivity (). FindViewById (android.r.id.list);   
 You can not call  getActivity (). OnViewById  onCreate Change the logic to onActivityCreated because the view was not created yet