android - I can't get data from edittext in fragment after I replace fragment -

i have 2 fragment edittext, data first edittext gets after call second fragment can't data edittext in second fragment. logcat said me data second edittext void.

this first fragment class

package com.example.n;  import android.annotation.targetapi; import android.app.fragment; import android.os.build; import android.os.bundle; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.edittext;   @targetapi(build.version_codes.honeycomb) public class fragmentadd extends fragment {     edittext et1;          @override         public view oncreateview(layoutinflater inflater, viewgroup container,                                  bundle savedinstancestate) {             view rootview = inflater.inflate(r.layout.frag_add, container, false);             et1 = (edittext) rootview.findviewbyid(r.id.edittext);             return rootview ;         }  } 

this second fragment class

    package com.example.n;  import android.annotation.targetapi; import android.app.fragment; import android.os.build; import android.os.bundle; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.edittext;   @targetapi(build.version_codes.honeycomb) public class fragmentadd2 extends fragment {     edittext et2;      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {         view rootview = inflater.inflate(r.layout.frag_add2, container, false);         et2 = (edittext) rootview.findviewbyid(r.id.edittext2);          return rootview ;     }      public string getedittext(){         /*fragmentadd2 fragmentadd3 = new fragmentadd2();         string data =  fragmentadd3.et2.gettext().tostring();*/         string data = et2.gettext().tostring();         return data;     }  } 

this part of main class

@targetapi(build.version_codes.honeycomb)     public void onclick(view view){     fragmentadd fragmentadd = new fragmentadd();      string data =  fragmentadd.et1.gettext().tostring(); }  @targetapi(build.version_codes.honeycomb)     public void onclick(view view){     fragmentadd2 fragmentadd2 = new fragmentadd2();      string data =  fragmentadd2.et2.gettext().tostring(); }  *logcat*   java.lang.illegalstateexception: not execute method of activity caused by: java.lang.reflect.invocationtargetexception         @ java.lang.reflect.method.invoke(native method)         @ java.lang.reflect.method.invoke(method.java:372) caused by: java.lang.nullpointerexception: attempt invoke virtual method 'android.text.editable android.widget.edittext.gettext()' on null object reference 

the correct way of accessing fragment method activity is

examplefragment fragment = (examplefragment) getfragmentmanager().findfragmentbyid(r.id.example_fragment); fragment.methodname();  

or

examplefragment fragment = (examplefragment) getfragmentmanager().findfragmentbytag("your tag"); fragment.methodname();  

"your tag" tag passed in parameter when added or replaced fragment.