android - java.lang.runtimeexception unable to start activity componentinfo -


i having error in code

java.lang.runtimeexception unable start activity componentinfo

package estimatewall.example.com.estimatewall;  import android.support.v7.app.actionbaractivity; import android.os.bundle; import android.view.menu;  import android.view.menuitem; import android.view.view; import android.widget.button; import android.widget.edittext; import android.widget.textview;  public class mainactivity extends actionbaractivity {      edittext inputtxt;     edittext inputtxt1;     textview settext;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          inputtxt = (edittext) findviewbyid(r.id.edittext);          // store edittext in variable          int val = integer.parseint(inputtxt.gettext().tostring());          inputtxt1 = (edittext) findviewbyid(r.id.edittext2);          // store edittext in variable          int val1 = integer.parseint(inputtxt1.gettext().tostring());          float block1,block2;         final float sum;         block1=(val*12)/7;         block2=(val1*12)/10;         sum=block1*block2;          button button = (button) findviewbyid(r.id.button);         button.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                  // perform action on click                 try {                     textview textview = (textview) findviewbyid(r.id.textview3);                     textview.settext("" + sum);                 }catch (exception e)                 {                     e.printstacktrace();                 }               }         });          }       @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.menu_main, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {         // handle action bar item clicks here. action bar         // automatically handle clicks on home/up button, long         // specify parent activity in androidmanifest.xml.         int id = item.getitemid();          //noinspection simplifiableifstatement         if (id == r.id.action_settings) {             return true;         }          return super.onoptionsitemselected(item);     } }

probably getting numberformatexception because here:

int val = integer.parseint(inputtxt.gettext().tostring());

trying convert null int.

use inputtxt.gettext() inside onclick method of button on click listener values input user in edittext or set default values in xml both edittext's android:text="0"


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