in oncreate in android activity what's wrong -


i need in appps searche product , and som referces of product in anather table create both of table , when execut application logcat says problem in oncreat can me understous , how fix j

ava.lang.runtimeexception: unable start activity componentinfo{tabet.ventas/tabet.ventas.lignevente}: java.lang.nullpointerexception 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.activitythread.access$600(activitythread.java:141) 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 05-19 15:20:46.934: e/androidruntime(799):  @ android.os.handler.dispatchmessage(handler.java:99) 05-19 15:20:46.934: e/androidruntime(799):  @ android.os.looper.loop(looper.java:137) 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.activitythread.main(activitythread.java:5039) 05-19 15:20:46.934: e/androidruntime(799):  @ java.lang.reflect.method.invokenative(native method) 05-19 15:20:46.934: e/androidruntime(799):  @ java.lang.reflect.method.invoke(method.java:511) 05-19 15:20:46.934: e/androidruntime(799):  @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 05-19 15:20:46.934: e/androidruntime(799):  @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 05-19 15:20:46.934: e/androidruntime(799):  @ dalvik.system.nativestart.main(native method) 05-19 15:20:46.934: e/androidruntime(799): caused by: java.lang.nullpointerexception 05-19 15:20:46.934: e/androidruntime(799):  @ tabet.ventas.lignevente.oncreate(lignevente.java:42) 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.activity.performcreate(activity.java:5104) 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1080) 05-19 15:20:46.934: e/androidruntime(799):  @ android.app.activitythread.performlaunchactivity(activitythread.java:2144) 05-19 15:20:46.934: e/androidruntime(799):  ... 11 more

and activity lignevente 

   public class lignevente extends activity {     sqlitedatabase dlv;     edittext inputnom;     edittext inputdate;     edittext txtrechercheproduit;     edittext nom_produit_vente;     edittext quantite_stock_vente;     edittext prix_ligne_vente;     edittext qte_voulue;     string recid="0";      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          setcontentview(r.layout.ligne_vente);           txtrechercheproduit =(edittext)findviewbyid(r.id.txtrechercheproduit);            nom_produit_vente=(edittext)findviewbyid(r.id.nom_produit_vente);          qte_voulue=(edittext)findviewbyid(r.id.qte_voulue);           prix_ligne_vente=(edittext)findviewbyid(r.id.prix_ligne_vente);            txtrechercheproduit.requestfocus();           nom_produit_vente.setenabled(false);          quantite_stock_vente.setenabled(false);          prix_ligne_vente.setenabled(false);        createdb();        qte_voulue=(edittext)findviewbyid(r.id.qte_voulue);       button btn_chercher=(button)findviewbyid(r.id.btn_chercher);       button btn_valid=(button)findviewbyid(r.id.valider_choix);       dlv=openorcreatedatabase("produitbase.db", sqlitedatabase.create_if_necessary, null);       btn_chercher.setonclicklistener(new onclicklistener() {             public void onclick(view arg0) {                 if (txtrechercheproduit.gettext().tostring().equals(""))                 {                 toast.maketext(lignevente.this, "entrer le produit rechercher.", toast.length_short).show();                 }                 else                 {                 searchrecord();                 }                 }                 });          btn_valid.setonclicklistener(new onclicklistener() {             public void onclick(view arg0) {                 if (qte_voulue.gettext().tostring().equals(""))                 {                 toast.maketext(lignevente.this, "entrer la qte vouloir acheté", toast.length_short).show();                 }                 else                 {                     insert();                 }                 }                 });         inputnom = (edittext) findviewbyid(r.id.nom);         inputdate = (edittext) findviewbyid(r.id.date);         button btnenvoifact = (button) findviewbyid(r.id.btnenvoyer);         btnenvoifact.setonclicklistener(new view.onclicklistener() {              public void onclick(view arg0) {                 //starting new intent                 intent verifierfacture = new intent(getapplicationcontext(), factureactivity.class);                  //envoyer nom du client et la date la facture                  verifierfacture.putextra("nom", inputnom.gettext().tostring());                 verifierfacture.putextra("date", inputdate.gettext().tostring());                  // ouvrire la fenétre facture ou nn ..!!???                 startactivity(verifierfacture);              }         });         button btnretour = (button) findviewbyid(r.id.btn_retour);       btnretour.setonclicklistener(new view.onclicklistener() {            @override           public void onclick(view view) {               // launching produit screen    //@_@       intent = new intent(getapplicationcontext(), venteboxclass.class);      //@_@     startactivity(i);              }       });       button btnvalider = (button) findviewbyid(r.id.valider_choix);       button btnrecherche = (button) findviewbyid(r.id.btn_chercher);      } 

package tabet.ventas;  import java.util.locale; import android.os.bundle; import android.app.activity; import android.content.intent; import android.database.cursor; import android.database.sqlite.sqlitedatabase; import android.view.menu; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.toast;  public class lignevente extends activity {     sqlitedatabase dlv;     edittext inputnom;     edittext inputdate;     edittext txtrechercheproduit;     edittext nom_produit_vente;     edittext quantite_stock_vente;     edittext prix_ligne_vente;     edittext prix_vente;     edittext qte_voulue;     string recid="0";      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);          setcontentview(r.layout.ligne_vente);           txtrechercheproduit =(edittext)findviewbyid(r.id.txtrechercheproduit);            nom_produit_vente=(edittext)findviewbyid(r.id.nom_produit_vente);          quantite_stock_vente=(edittext)findviewbyid(r.id.quantite_stock_vente);          prix_ligne_vente=(edittext)findviewbyid(r.id. prix_ligne_vente);            txtrechercheproduit.requestfocus();           nom_produit_vente.setenabled(false);          quantite_stock_vente.setenabled(false);          prix_ligne_vente.setenabled(false);        createdb();        qte_voulue=(edittext)findviewbyid(r.id.qte_voulue);       button btn_chercher=(button)findviewbyid(r.id.btn_chercher);       button btn_valid=(button)findviewbyid(r.id.valider_choix);       dlv=openorcreatedatabase("produitbase.db", sqlitedatabase.create_if_necessary, null);       btn_chercher.setonclicklistener(new onclicklistener() {             public void onclick(view arg0) {                 if (txtrechercheproduit.gettext().tostring().equals(""))                 {                 toast.maketext(lignevente.this, "entrer le produit rechercher.", toast.length_short).show();                 }                 else                 {                 searchrecord();                 }                 }                 });          btn_valid.setonclicklistener(new onclicklistener() {             public void onclick(view arg0) {                 if (qte_voulue.gettext().tostring().equals(""))                 {                 toast.maketext(lignevente.this, "entrer la qte vouloir acheté", toast.length_short).show();                 }                 else                 {                     insert();                 }                 }                 });         inputnom = (edittext) findviewbyid(r.id.nom);         inputdate = (edittext) findviewbyid(r.id.date);         button btnenvoifact = (button) findviewbyid(r.id.btnenvoyer);         btnenvoifact.setonclicklistener(new view.onclicklistener() {              public void onclick(view arg0) {                 //starting new intent                 intent verifierfacture = new intent(getapplicationcontext(), factureactivity.class);                  //envoyer nom du client et la date la facture                  verifierfacture.putextra("nom", inputnom.gettext().tostring());                 verifierfacture.putextra("date", inputdate.gettext().tostring());                  // ouvrire la fenétre facture ou nn ..!!???                 startactivity(verifierfacture);              }         });         button btnretour = (button) findviewbyid(r.id.btn_retour);       btnretour.setonclicklistener(new view.onclicklistener() {            @override           public void onclick(view view) {               // launching produit screen    //@_@       intent = new intent(getapplicationcontext(), venteboxclass.class);      //@_@     startactivity(i);              }       });       button btnvalider = (button) findviewbyid(r.id.valider_choix);       button btnrecherche = (button) findviewbyid(r.id.btn_chercher);      }

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