android - nullpointer exception while starting another activity -


when called activity using intent gives nullpointer exception.

intent

public void showevent(view view){         intent intent = new intent(this, getclicker.class);          date = (textview)findviewbyid(r.id.textview2);         string datevalue = date.gettext().tostring();         userselection=(textview)findviewbyid(r.id.textview1);         string userselectvalue = userselection.gettext().tostring();          intent.putextra(extra_message, datevalue);         intent.putextra(extra_message1, userselectvalue);          startactivity(intent);     }

getclicker.java

package example.events1;  import android.app.listactivity; import android.content.intent; import android.database.cursor; import android.os.bundle; import android.support.v4.widget.simplecursoradapter; import android.widget.listview;  public class getclicker  extends listactivity {      classdbopenhelper eventsdata1;     cursor cursor1;      listview listview ;       @override     public void oncreate(bundle savedinstancestate) {         intent intent = getintent();         string datevalue = intent.getstringextra(firstactivity.extra_message);         string userselectvalue = intent.getstringextra(firstactivity.extra_message1);         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_second);                                   cursor1 = eventsdata1.getcontact(datevalue,userselectvalue);          string[] fromcolumns = {classdbopenhelper.key_event};          int[] toviews = {r.id.event};          simplecursoradapter adapter = new simplecursoradapter(this,r.layout.events, cursor1, fromcolumns, toviews,0 );           listview = getlistview();           listview.setadapter(adapter);         }      public void ondestroy() {         eventsdata1.close();       } }

logcat

08-07 11:52:54.445: e/trace(2926): error opening trace file: no such file or directory (2) 08-07 11:52:58.564: e/androidruntime(2926): fatal exception: main 08-07 11:52:58.564: e/androidruntime(2926): java.lang.runtimeexception: unable start activity componentinfo{example.events1/example.events1.getclicker}: java.lang.nullpointerexception 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2180) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2230) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.activitythread.access$600(activitythread.java:141) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.activitythread$h.handlemessage(activitythread.java:1234) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.os.handler.dispatchmessage(handler.java:99) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.os.looper.loop(looper.java:137) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.activitythread.main(activitythread.java:5041) 08-07 11:52:58.564: e/androidruntime(2926):     @ java.lang.reflect.method.invokenative(native method) 08-07 11:52:58.564: e/androidruntime(2926):     @ java.lang.reflect.method.invoke(method.java:511) 08-07 11:52:58.564: e/androidruntime(2926):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 08-07 11:52:58.564: e/androidruntime(2926):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 08-07 11:52:58.564: e/androidruntime(2926):     @ dalvik.system.nativestart.main(native method) 08-07 11:52:58.564: e/androidruntime(2926): caused by: java.lang.nullpointerexception 08-07 11:52:58.564: e/androidruntime(2926):     @ example.events1.getclicker.oncreate(getclicker.java:28) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.activity.performcreate(activity.java:5104) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1080) 08-07 11:52:58.564: e/androidruntime(2926):     @ android.app.activitythread.performlaunchactivity(activitythread.java:2144) 08-07 11:52:58.564: e/androidruntime(2926):     ... 11 more

i don't see you're initializing eventsdata1 , you're using at:

cursor1 = eventsdata1.getcontact(datevalue,userselectvalue);

that can cause null pointer exception.


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