android - How to initialize two layout Button in same activity? -


i used (include) using 2 layout in 1 activity. , visible 2nd layout clicking event. when initialize 2nd layout button, android studio don't id of 2nd layout button. how can solve problem. , how initialize 2nd layout button in activity.

main layout

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical" android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="#ebcf1f28"     >      <include         android:id="@+id/player"         android:layout="@layout/player"         android:visibility="gone"/>       <linearlayout         android:layout_width="wrap_content"         android:layout_height="wrap_content">          <textview             android:id="@+id/back"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_margintop="15dp"             android:layout_marginleft="145dp"             android:layout_marginbottom="10dp"             android:background="#ebcf1f28"             android:text="back"             android:textsize="25dp"             android:textcolor="#1d1d28"             />     </linearlayout>     <linearlayout        android:layout_width="match_parent"        android:layout_height="match_parent">         <textview            android:id="@+id/textcolor"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:textcolor = "#262323"            />         <listview            android:id="@+id/list_view"            android:layout_width="match_parent"            android:layout_height="match_parent"            >         </listview>    </linearlayout>       </linearlayout>

2nd layout

<?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"     android:background="#00ffff"      >       <linearlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:orientation="horizontal">          <seekbar             android:id="@+id/seekbar"             android:layout_margintop="50dp"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:background="#ffffff"             android:color:"#000000"/>        </linearlayout>      <linearlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:orientation="horizontal">           <button             android:id="@+id/backsong"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_margintop="25dp"             android:layout_marginleft="33dp"             android:text="|<"             android:textsize="30dp"             />          <button             android:id="@+id/playsong"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_margintop="25dp"             android:layout_marginleft="25dp"             android:text="| |"             android:textsize="30dp"             />           <button             android:id="@+id/nextsong"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_margintop="25dp"             android:layout_marginleft="25dp"             android:text=">|"             android:textsize="30dp"             />       </linearlayout>       </linearlayout>

my activity code:

package com.example.anupam.favouritesonglist;  import android.content.intent; import android.media.mediaplayer; import android.net.uri; import android.os.environment; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.text.layout; import android.view.view; import android.widget.adapterview; import android.widget.arrayadapter; import android.widget.button; import android.widget.listview; import android.widget.textview;  import java.io.file; import java.util.arraylist;  public class songlist extends appcompatactivity implements view.onclicklistener{      arraylist<file> songfile;      string[] songitem;      listview lv;      mediaplayer mp ;     view player ;      @override     protected void oncreate(bundle savedinstancestate)     {         super.oncreate(savedinstancestate);         setcontentview(r.layout.song_list);           init();           lv.setonclicklistener(new adapterview.onitemclicklistener()         {             onitemclick();         });      }       public void init()     {         lv  = (listview) findviewbyid(r.id.list_view);         player = (view)findviewbyid(r.id.player) ;         setsongfile();         textview = (textview) findviewbyid(r.id.back);         back.setonclicklistener(this);     }      private void setsongfile()     {         songfile = findsong(environment.getexternalstoragedirectory());          songitem = new string[songfile.size()];          (int = 0; < songfile.size(); i++)         {             songitem[i] = songfile.get(i).getname();         }         arrayadapter<string> songadb = new arrayadapter<>(getapplicationcontext(), android.r.layout.simple_list_item_1, songitem);         lv.setadapter(songadb);     }      public arraylist<file> findsong(file root)     {         arraylist<file> song = new arraylist<file>();         file[] musicfilem = root.listfiles();          (file singlefile : musicfilem) {             if (singlefile.isdirectory() && !singlefile.ishidden()) {                 song.addall(findsong(singlefile));             } else if (singlefile.getname().endswith(".mp3")) {                 song.add(singlefile);             }         }         return song;     }     @override     public void onclick(view v)     {         int id = v.getid();          switch (id)         {             case r.id.back:             {                 intent intent = new intent(getapplicationcontext(),mainactivity.class);                 startactivity(intent);                 finish();             }           }     }             @override         public void onitemclick(adapterview<?> parent, view view, int position, long id)         {              player.setvisibility(view.visible);             playerinit();             uri u = uri.parse(songfile.get(position).tostring());             mp = mediaplayer.create(getapplicationcontext(),u);             mp.start();          }      public void playerinit()     {         button backsong = (button)findviewbyid(r.id.backsong);         button backsong = (button)findviewbyid(r.id.playsong);         button backsong = (button)findviewbyid(r.id.nextsong);     }      }

please check last 2 function used 2nd layout initialization


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