android - Button Control? -

so i'm pretty new @ whole development thing android , don't know slick of java. i'm tryin teach myself thought great resource. i've read devoloper.android resources , still dont understand here question. i'm making simple app change background color when button pressed. how make button that?

any outside resources/examples appreciated

here code far:

introactivity.java

 package com.flashcalc;  import android.app.activity; import android.os.bundle; import android.view.view.ontouchlistener; import android.widget.button;  public class introactivity extends activity {     /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);      } } 

main.xml

   <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:background="@color/all_white"> <textview       android:layout_width="fill_parent"      android:layout_height="wrap_content"      android:text="@string/hello"     android:textcolor="@color/all_black"      android:gravity="center_horizontal"/> <button android:text="@string/changecolor"  android:id="@+id/changecolor"   android:layout_width="wrap_content"   android:layout_height="wrap_content"  android:gravity="center_horizontal|center_horizontal|center"  android:layout_gravity="center_horizontal|center_horizontal|center">  </button> </linearlayout> 

strings.xml

<?xml version="1.0" encoding="utf-8"?> <resources>     <string name="hello">tjs flashlight</string>     <string name="app_name">flashcalc</string>     <string name="changecolor">i love buttons</string>     <color name="all_white">#ffffff</color>     <color name="all_black">#000000</color> </resources> 

you need view of linearlayout , set it's background color.

first need assign linearlayout id in xml. in button's onclicklistener, this.

linearlayout ll = (linearlayout) findviewbyid(r.id.layoutid); ll.setbackgroundcolor(); //i think it's called 

i forget goes in setbackgroundcolor function, you'll have up.

you should go through hello android tutorials before trying stuff on own this. haven't tried before coming help.