android - Programatically setColor,font to Textviews -

i have created list view 3 items in each list view item using 2 seperate .'xml's. 1)list_view.xml

 <listview xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:id="@+id/listview">  </listview> 

2)list_item.xml

 <?xml version="1.0" encoding="utf-8"?> 

<textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textappearance="?android:attr/textappearancelarge"         android:text="text here"         android:id="@+id/textview"         android:layout_aligntop="@+id/textview"         android:layout_alignleft="@+id/textview"         android:layout_centervertical="true"/>  <textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textappearance="?android:attr/textappearancelarge"         android:text="-"         android:id="@+id/seperator"         android:layout_alignbottom="@+id/textview"         android:layout_centervertical="true"         android:layout_centerhorizontal="true"/>  <textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textappearance="?android:attr/textappearancelarge"         android:text="000"         android:id="@+id/price"         android:layout_alignparenttop="true"         android:layout_centervertical="true"         android:layout_alignparentright="true"/>  <textview         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:textappearance="?android:attr/textappearancelarge"         android:text="$"         android:id="@+id/prefix"         android:layout_alignparenttop="true"         android:layout_centervertical="true"         android:layout_toleftof="@+id/price"/> </relativelayout> 

now, have created list view items using 'simpleadapter'. want access items in list view (textview, seperator,...) , change color, size etc programatically.

here code of mainactivity.java

public class mainactivity extends activity {   public relativelayout relativelayout; public relativelayout.layoutparams lp; public simpleadapter mlist;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      setcontentview(r.layout.list_view);     listview list = (listview) findviewbyid(r.id.listview);      //background color     list.setbackgroundcolor(color.yellow);        textview itemtext = (textview)findviewbyid(r.id.textview);     itemtext.settypeface(typeface.sans_serif);       arraylist<hashmap<string, string>> mylist = new arraylist<hashmap<string, string>>();     hashmap<string, string> map = new hashmap<string, string>();      //dummy data     //add elements map     map.put("text", "click edit0");     map.put("seperator", "-");     map.put("price", "100");     // add map elements list     mylist.add(map);      //add elements map     map = new hashmap<string, string>();     map.put("text", "click edit1");     map.put("seperator", "-");     map.put("price", "102");     //add elements map     mylist.add(map);      map = new hashmap<string, string>();     map.put("text", "click edit2");     map.put("seperator", "-");     map.put("price", "104");     mylist.add(map);       //use adapter set list items     mlist = new simpleadapter(this, mylist, r.layout.list_item,             new string[] {"text", "seperator", "price"}, new int[] {r.id.textview, r.id.seperator, r.id.price});     list.setadapter(mlist);  }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; } 

}

all worked fine until tried access list view items , change them. code crashes , shows null pointer exception @

textview itemtext = (textview)findviewbyid(r.id.textview); itemtext.settypeface(typeface.sans_serif); 

i suspect might because did not setcontentview list_item.xml. there way access elements? if yes how?

for setting color follow bellow code

string text = "<font color=#8469af>by tapping checkout, agree our </font> <font color=#ffffff>terms.</font>";     tvterms.settext(html.fromhtml(text));