java - Android: whenever a edittext field is left empty, program closes giving exception -

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program sudenly close when edittext left empty when ever pressed button move next activity. here code.

package cme.ws.com.ws.cme;  import android.app.activity; import android.content.context; import android.content.intent; import android.os.bundle; import android.support.v7.app.actionbaractivity; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.toast;  /** * created waqas aamer on 5/27/2015. */ public class areaactivity extends activity {  int plotarea, coveredarea; int brickprice, blockprice, cementprice, sandprice, crushprice, ironprice; int brickprice1, blockprice1, cementprice1, sandprice1, crushprice1, ironprice1; int plotarea1, coveredarea1;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_area);      {         final context context = getapplicationcontext();         final int duration = toast.length_short;          button movenextarea=(button) findviewbyid(r.id.buttonnextexteriorwall);         movenextarea.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                  intent intent = getintent();                 if (null != intent)                 {                     // test = intent.getstringextra("nameofvariable");                     brickprice1 = intent.getintextra("anything00", brickprice);                     blockprice1 = intent.getintextra("anything11", blockprice);                     sandprice1 = intent.getintextra("anything22", sandprice);                     ironprice1 = intent.getintextra("anything33", ironprice);                     cementprice1 = intent.getintextra("anything44", cementprice);                     crushprice1 = intent.getintextra("anything55", crushprice);                 }                 edittext areanumber1 = (edittext) findviewbyid(r.id.edittextplotarea);                 if(areanumber1 == null)                 {                     toast toast = toast.maketext(context, "please fill plot area field ", duration);                     toast.show();                 }                 else                 {                     plotarea1 = integer.parseint(areanumber1.gettext().tostring());                 }                  edittext areanumber2 = (edittext) findviewbyid(r.id.edittextcoveredarea);                 if(areanumber2 == null)                 {                     toast toast1 = toast.maketext(context, "please fill covered area field ", duration);                     toast1.show();                 }                 else                 {                     coveredarea1 = integer.parseint(areanumber2.gettext().tostring());                 }                   int sqrt = (int) math.sqrt(plotarea1);                 int oneside = sqrt;                  intent secondactivity = new intent (getapplicationcontext(), exteriorwallactivity.class);                 secondactivity.putextra("anything000", brickprice1);                 secondactivity.putextra("anything111", blockprice1);                 secondactivity.putextra("anything222", cementprice1);                 secondactivity.putextra("anything333", sandprice1);                 secondactivity.putextra("anything444", ironprice1);                 secondactivity.putextra("anything555", crushprice1);                 secondactivity.putextra("anything", oneside);                 secondactivity.putextra("anything1", coveredarea1);                 startactivity(secondactivity);             }          });         } }

}

i want whenver edittext box left empty .the variable in whcih storing value automatically stores 0. eroor log is

07-05 23:20:42.206  14348-14348/cme.ws.com.ws.cme e/androidruntime﹕ fatal exception: main     java.lang.numberformatexception: unable parse '' integer             @ java.lang.integer.parseint(integer.java:412)             @ java.lang.integer.parseint(integer.java:382)             @ cme.ws.com.ws.cme.areaactivity$1.onclick(areaactivity.java:52)             @ android.view.view.performclick(view.java:2408)             @ android.view.view$performclick.run(view.java:8816)             @ android.os.handler.handlecallback(handler.java:587)             @ android.os.handler.dispatchmessage(handler.java:92)             @ android.os.looper.loop(looper.java:123)             @ android.app.activitythread.main(activitythread.java:4627)             @ java.lang.reflect.method.invokenative(native method)             @ java.lang.reflect.method.invoke(method.java:521)             @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:868)             @ com.android.internal.os.zygoteinit.main(zygoteinit.java:626)             @ dalvik.system.nativestart.main(native method)

your edittext fields cannot equals null because in previous line of verification have initialized them. instead of using if (areanumber1 == null) , if (areanumber2 == null), check edittext this:

boolean isempty(edittext textfield) {     return textfield.gettext().tostring().trim().length() == 0; }

if function return false means edittext not empty , return true means edittext empty.


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