android - addView to layout with java -


i trying understand how add views programatically (with java) in android applications. created simple layout (below) practice struggle solve following error:

java.lang.illegalstateexception: not find method addingview() in parent or ancestor context android:onclick attribute defined on view class android.support.v7.widget.appcompatbutton id 'button'

screenshot app:

my xml:

 <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:orientation="vertical"     android:id="@+id/activity_main"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin"     tools:context="com.example.android.view_create_test_1.mainactivity">      <linearlayout         android:id="@+id/top"         android:orientation="horizontal"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_weight="4"         android:background="#555555">     </linearlayout>      <relativelayout         android:id="@+id/bottom"         android:orientation="horizontal"         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_weight="1"         android:background="#116677">          <button             android:text="add"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:id="@+id/button"             android:layout_centerinparent="true"             android:onclick="addingview"/>     </relativelayout>  </linearlayout>

my java:

public class mainactivity extends appcompatactivity {      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);     }      public void addingview (){         linearlayout top = (linearlayout) findviewbyid(r.id.top);         linearlayout newlayout = new linearlayout (this);         linearlayout.layoutparams params = new linearlayout.layoutparams(viewgroup.layoutparams.match_parent, viewgroup.layoutparams.wrap_content);         newlayout.setlayoutparams(new actionbar.layoutparams(actionbar.layoutparams.wrap_content, 50));         top.addview(newlayout,params);     }  }

please me out how solve error. thanks

your method should come this

public void addingview (view view){          linearlayout top = (linearlayout) findviewbyid(r.id.top);         linearlayout newlayout = new linearlayout (this);         linearlayout.layoutparams params = new linearlayout.layoutparams(viewgroup.layoutparams.match_parent, viewgroup.layoutparams.wrap_content);         newlayout.setlayoutparams(new actionbar.layoutparams(actionbar.layoutparams.wrap_content, 50));         top.addview(newlayout,params); }

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