android - AppCompatSpinner is not a view that can be bounds by this SimpleCursorAdapter -

i'm totally new android development, , i'm trying populate spinner data database column. successful in populating cursor object data, i'm doing wrong.

i read similar problems in other topics here, nothing solved issue.

protected void oncreate(bundle savedinstancestate) {      super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_set_grade);      assetdatabasehelper dbhelper = new assetdatabasehelper(getbasecontext(), "mydb");     try {         dbhelper.importifnotexist();     } catch (ioexception e) {         e.printstacktrace();     }      db = dbhelper.getreadabledatabase();     cursor cursor = db.rawquery("select name _id items",null);             simplecursoradapter adapter = new simplecursoradapter(             this,             r.layout.activity_set_grade,             cursor,             fromcols,             toviews,             0);      spinner = (spinner) findviewbyid(r.id.items_spinner);     adapter.setdropdownviewresource(r.id.items_spinner);     spinner.setadapter(adapter); } 

my activity_set_grade contains spinner (in relativelayout if matters):

<spinner     android:id="@+id/items_spinner"     android:layout_width="fill_parent"     android:layout_height="wrap_content" /> 

i following error message in logcat

java.lang.illegalstateexception: android.support.v7.widget.appcompatspinner not  view can bounds simplecursoradapter 

thank in advance!

i believe you're importing android framework simplecursorspinner but, because you're using library stuff, must use simplecursorspinner library too.

that simple change on import from:

import android.widget.simplecursoradapter 

to

import android.support.v4.widget.simplecursoradapter