Simple application of view in Android---small ball that moves with your finger

public class Drawview extends view{public float currentx=40;    public float currenty=50;    Public Drawview (Context context) {super (context);        }//rewrite OnDraw, protected void OnDraw (canvas canvas) {Paint paint=new paint () through canvas painting;        Paint.setcolor (color.red);    Canvas.drawcircle (Currentx,currenty,25,paint); }

<?xml version= "1.0"  encoding= "Utf-8"? ><linearlayout  xmlns:android= "Http://schemas.android.com/apk/res/android"     android:layout_width= " Fill_parent "    android:layout_height=" Fill_parent "    android:o rientation= "vertical"     android:background= "#99FFCC"     android:id= "@ +id/root "></LINEARLAYOUT> 

public class mainactivity extends activity{     @Override      protected void oncreate (bundle savedinstancestate)  {         super.oncreate (savedinstancestate);         Setcontentview (r.layout.activity_main);         linearlayout root= (linearlayout)  findviewbyid (r.id.root);        final  Drawview drawview=new drawview (this);         windowmanager  wm = this.getwindowmanager ();         int width  = wm.getdefaultdisplay (). getwidth ();         int height  = wm.getdefaultdisplay (). GetHeight ();         toast.maketext (This, "Width is" +width+ "Height "+height,toast.length_long). Show ();         Drawview.setminimumheight (+);         drawview.setminimumheight (500);         drawview.setontouchlistener (New View.OnTouchListener () {              @Override              public boolean ontouch (View v, MotionEvent  event)  {                 drawview.currentx=event.getx ();                 drawview.currenty=event.gety ();                 drawview.invalidate ();                 return  true;            }         });             root.addview (Drawview);     }}

This article is from the "Java White Battlefield" blog, be sure to keep this source http://8023java.blog.51cto.com/10117207/1726924

Simple application of view in Android---small ball that moves with your finger