java - How to create an interface to get info from a Fragment to an Android Activity? -

over past days i've desperately been trying build android app simple fragment (which use twice). want pass contents of fragments' edittext-boxes new activity. can't figure out how contents fragments. have far this:

i've got edit_text_fragment.xml:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical" >     <edittext          android:id="@+id/my_edit_text"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:hint="my hint" /> </linearlayout> 

and corresponding myedittextfragment.java:

public class myedittextfragment extends fragment {     @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         view view = inflater.inflate(r.layout.edit_text_fragment, container, false);         return view;     } } 

i use fragment twice in main.xml this:

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">     <fragment          android:id="@+id/detailfragment_placeholder"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         class="com.example.fragmenttester5.myedittextfragment" />     <fragment          android:id="@+id/detailfragment_placeholder2"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         class="com.example.fragmenttester5.myedittextfragment" />     <button          android:id="@+id/submit_button"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="submit of it" /> </linearlayout> 

and in mainactivity hooked button new activity:

public class mainactivity extends activity {     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          button submitbutton = (button) findviewbyid(r.id.submit_button);         submitbutton.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v){                 intent intent = new intent(mainactivity.this, otheractivity.class);                 intent.putextra("result1", "the_result_from_the_first_edittext");                 intent.putextra("result2", "the_result_from_the_second_edittext");                 startactivity(intent);             }         });     } } 

i think need define kind of interface in fragment, can't find how. read couple examples , tutorials (like this one), make no sense me @ all. don't understand code given , don't understand how adjust use case.

so question; can me contents of fragment within activity? examples very welcome since i'm banging head against wall here..

so you'd create interface talk activity if event happened in fragment. situations this, can make accessible method in fragment activity can call. so

public class myedittextfragment extends fragment {     private edittext medittext;      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         view view = inflater.inflate(r.layout.edit_text_fragment, container, false);         return view;     }      @override     public void onactivitycreated(bundle savedinstancestate) {         super.onactivitycreated(savedinstancestate);          medittext = (edittext) getview().findviewbyid(r.id.my_edit_text);     }      public editable gettext() {         return medittext.gettext();     } } 

then

public class mainactivity extends activity {     @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          final myedittextfragment fragment1 = (myedittextfragment)             getfragmentmanager().findfragmentbyid(r.id.detailfragment_placeholder);          final myedittextfragment fragment2 = (myedittextfragment)             getfragmentmanager().findfragmentbyid(r.id.detailfragment_placeholder2);          button submitbutton = (button) findviewbyid(r.id.submit_button);         submitbutton.setonclicklistener(new onclicklistener() {             @override             public void onclick(view v){                  string firstresult = fragment1.gettext().tostring();                 string secondresult = fragment2.gettext().tostring();                  intent intent = new intent(mainactivity.this, otheractivity.class);                 intent.putextra("result1", firstresult);                 intent.putextra("result2", secondresult);                 startactivity(intent);             }         });     } } 

this assumes assigned fragment tags in fragmenttransaction. sure check null fragments (omitted brevity)