android - Class from XML layout that can be instantiated in the main activity -

so have xml file

<?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:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical"     android:padding="10sp"     android:id="@+id/lengthlayout"     android:background="@color/gray2"      >     <linearlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         >          <edittext             android:id="@+id/inputlength"             android:layout_width="fill_parent"             android:layout_height="match_parent"             android:layout_weight="0.3"             android:hint="@string/temperaturehint"             android:inputtype="number"             android:textsize="30sp"             tools:ignore="nestedweights" />          <spinner             android:id="@+id/lengthunits"             android:layout_width="fill_parent"             android:layout_height="match_parent"             android:layout_weight="0.7" />     </linearlayout>    <view             android:layout_width="fill_parent"             android:layout_height="15dp"      />      <linearlayout         android:layout_width="match_parent"         android:layout_height="0dp"         android:layout_weight="1"         android:orientation="horizontal"         >         <listview              android:layout_width="match_parent"             android:layout_height="wrap_content"             android:verticalspacing="10sp"             android:horizontalspacing="10dp"             android:gravity="center"             android:id="@+id/results_length"             android:divider="@android:color/transparent"             android:dividerheight="5sp"                        >          </listview>          </linearlayout> </linearlayout> 

and want create class use resources xml file. when class instantiated in main activity add view app .

public class lengthfragment extends view implements onclicklistener, onitemselectedlistener{   context rcontext;  public lengthfragment(context context){     super(context);     rcontext = context;      inflate(context, r.layout.view_length, null); } 

and doing in main activity

lengthfragment lf = new lengthfragment(testapp.this); 

i have tried passing in inflator of main activity lengthfragment , inflating view using inflator doesnt work gives me blank view. thanks.

also works when in main activity linearlayout l1 = (linearlayout) getlayoutinflater().inflate(r.layout.view_length, null);

but want create view outside of main acttivity instantiaing class in main activity.