java - Initialize paypal only once -

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i have designed paypal functionality in project this:

public class mypaypalactivity extends activity implements onclicklistener{      /** called when activity first created. */     @override  public void oncreate(bundle savedinstancestate) {          super.oncreate(savedinstancestate);          linearlayout mlinlay= new linearlayout(this);          setcontentview(r.layout.main);          paypal pp = paypal.initwithappid(this, "app-  80w284485p519543t",paypal.env_sandbox);           linearlayout layoutsimplepayment = new linearlayout(this);          layoutsimplepayment.setlayoutparams(new layoutparams(                  layoutparams.wrap_content, layoutparams.wrap_content));          layoutsimplepayment.setorientation(linearlayout.vertical);          checkoutbutton launchsimplepayment = pp.getcheckoutbutton(this,                  paypal.button_118x24, checkoutbutton.text_pay);          launchsimplepayment.setonclicklistener( this);          layoutsimplepayment.addview(launchsimplepayment);          mlinlay.addview(layoutsimplepayment);          setcontentview(mlinlay);      }

this work correctly once. when press paypal button second time application crashes. there error in catlog initialized paypal twice, use getinstance(); after initialization.

what should this?

hey solution question, have done myself. 

paypal pp = paypal.getinstance();         if (pp == null) {             try {                 pp = paypal.initwithappid(this, "", paypal.env_none);             } catch (illegalstateexception e) {                 throw new runtimeexception(e);             }             pp.setshippingenabled(false);         }

thank all...


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