android - Using a CheckBox which doesn't exist in current layout -


in application have class named chatactivity. showing listview. in oncreate have set layout like

    super.oncreate(savedinstancestate);     setcontentview(r.layout.conversation_window);

conversation_window.xml looks this

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:divider="@null" android:padding="16dp" android:fitssystemwindows="true">  <listview     android:layout_width="match_parent"     android:layout_height="match_parent"     android:divider="@null"     android:id="@+id/thread_listview"     android:layout_below="@+id/edittext"     android:layout_weight="1" />  <view     android:id="@+id/innerline"     android:layout_width="match_parent"     android:layout_height="1dp"     android:layout_margintop="5dp"     android:background="#9e9e9e"     android:layout_weight="0"     android:layout_marginbottom="12dp"/>  <textview     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:textsize="12sp"     android:textstyle="bold"     android:textcolor="#212121"     android:layout_marginbottom="8dp"     android:text="(1) 0/158"     android:id="@+id/character_count_textview"/>  <linearlayout     android:orientation="horizontal"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_margintop="10dp"     android:layout_weight="0"     android:layout_marginbottom="10dp">       <edittext         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:id="@+id/compose_edittext"         android:layout_weight="1"         android:layout_marginright="5dp"         android:hint="এখানে লিখুন..."         android:inputtype="textmultiline|textcapsentences"         android:scrollbars="vertical"         android:background="@drawable/apptheme_textfield_disabled_holo_light"         />      <imagebutton         android:layout_width="50dp"         android:layout_height="wrap_content"         android:id="@+id/send_imagebutton"         android:background="@mipmap/send_black"         /> </linearlayout>

for each row of listview there xml called list_item_chat_message.xml looks this

   <?xml version="1.0" encoding="utf-8"?>    <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content">  <checkbox     android:id="@+id/checkbox_conversation"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_marginleft="8dp"     android:layout_margintop="20dp"     android:visibility="gone" />  <linearlayout     android:id="@+id/content"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_alignparentright="true"     android:layout_margin="10dp"     android:orientation="vertical">      <linearlayout         android:id="@+id/contentwithbackground"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="right"         android:background="@drawable/in_message_bg"         android:orientation="vertical">          <textview             android:id="@+id/txtmessage"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:maxwidth="200dp"             android:textcolor="@android:color/black"             android:textsize="16sp" />      </linearlayout>      <textview         android:id="@+id/timeinfo"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:layout_gravity="right"         android:padding="3dp"         android:textcolor="@android:color/darker_gray" />  </linearlayout>

there checkbox in list_item_chat_message.xml want use in chatactivity class setoncheckedchangelistener.but when writing in chatactivity class

itemcheckbox = (checkbox) findviewbyid(r.id.checkbox_conversation);

it throws null object reference. how can declare checkbox in activity?


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