android - Custom onDraw() method not called -

<linearlayout android:id="@+id/svll" android:orientation="horizontal"     android:layout_width="fill_parent" android:layout_height="fill_parent">     <scrollview android:id="@+id/sv"         android:layout_width="wrap_content" android:layout_height="wrap_content"         xmlns:android="http://schemas.android.com/apk/res/android">         <!--             <textview android:layout_width="match_parent"             android:layout_height="wrap_content"             android:text="@string/scrollbar_2_text" />         -->         <com.mypackage.mydrawableview             android:layout_width="fill_parent" android:layout_height="wrap_content" />     </scrollview> </linearlayout> 

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public class mydrawableview extends view {      context thiscontext;      public mydrawableview(context context, attributeset attr) {         super(context);         thiscontext = context;     }      @override     protected void ondraw(canvas canvas) {         super.ondraw(canvas);          final paint paint = new paint();         paint.setcolor(color.blue);         paint.settextsize(12);         canvas.drawtext("blah blah", 0, 100, paint);     } } 

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public class myactivity extends activity {     // member variable declaration here     // called when activity first created.     @override     public void oncreate(bundle savedinstancestate) {         // code here super.oncreate(savedinstancestate);         setcontentview(r.layout.xmllayout);         linearlayout svll = (linearlayout) findviewbyid(r.id.svll);         svll.setlayoutparams(new linearlayout.layoutparams(300, 300));     }  }  

i putting breakpoint, breakpoint never hit inside ondraw() method, what's wrong ?

add setwillnotdraw(false) in mydrawableview constructor. original answer here.