java - Android crash when starting activity? -

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i have new intent activity want open when double click registered, know double click working properly, every time try start new activity stops working ? (force quits)

code : 

 imview.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v) {                 long thistime = system.currenttimemillis();                   if (thistime - lasttouchtime < 250) {                      // double click                       //toast toast = toast.maketext(getapplicationcontext(), "double tap worked!", 10);                       //toast.show();                       lasttouchtime = -1;                       intent myintent = new intent(v.getcontext(), zoom.class);                       startactivityforresult(myintent, 0);                    } else {                       // slow                       lasttouchtime = thistime;                   }             }          });

you may not have put second activity in manifiest file

 <activity android:name="zoom"            android:label="@string/app_name"/>

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