android - Click on ListView Item not working, I have three textviews and a button in my each ListView Item -

i writing app in trying to open activity , update item detail using tap on item in listview

problem:

whenever click on item in listview, not able start activity , want know how update item detail...

i have 3 textviews , button in each listview item

by using below code in cartactivity, not able open productinformationactivity

    listview mlstview1 = (listview) findviewbyid(r.id.listview1);     cartadapter mviewcartadpt = new cartadapter(cartactivity.this); mlstview1.setadapter(mviewcartadpt);     mlstview1.setonitemclicklistener(new onitemclicklistener() {         @override         public void onitemclick(adapterview<?> parent, view view, int position,                 long id) {              intent intent = new intent(cartactivity.this, com.productinformationactivity.class);             startactivity(intent);         }     }); 

cartadapter.java:

  public view getview(final int position, view convertview, viewgroup parent) {     // todo auto-generated method stub      hashmap<string, string> item = new hashmap<string, string>();     item = constants.mitem_detail.get(position);      // setting values in listview      title.settext(item.get(com.productinformationactivity.key_title));     qty.settext(item.get(com.productinformationactivity.key_qty));     cost.settext(item.get(com.productinformationactivity.key_cost));     total.settext(item.get(com.productinformationactivity.key_total));      return vi;  }    

have added ativity manifest file? need add activity in application tag:

<activity android:name="com.erachnida.restaurant.versionoct.menu.productinformationactivity" />