Android footstep---ball with finger movement

This study is mainly in the package in addition to automatically generated Mainactivity.java, and then create a new class, Drawview, mainactivity inside call Drawview.

In Drawview, it is primarily a rewrite of the OnDraw method,----The method is responsible for drawing a small ball at the specified location of the component.

Package Org.crazyit.helloworld;import Android.content.Context; Import Android.graphics.Canvas; Import Android.graphics.Color; Import Android.graphics.Paint; Import Android.view.View; public class Drawview extends view{public   float currentx=40;     public float currenty=50;          A constructor method must be overridden public     Drawview (context context) {         super (context);         TODO auto-generated constructor stub     }     //override OnDraw method canvas painting  @Override public     void OnDraw (canvas Canvas) {               super.ondraw (canvas);         Create brush         Paint paint=new paint ();         Paint.setcolor (color.red);         Draw a small round         canvas.drawcircle (CurrentX, currenty, +, paint);      }}

Quote Drawview in Mainactivity.

Package Org.crazyit.helloworld;import android.app.Activity; Import Android.os.Bundle; Import Android.util.log;import android.view.MotionEvent; Import Android.view.View; Import Android.widget.LinearLayout; public class Mainactivity extends Activity {public void onCreate (Bundle savedinstancestate) {super.oncreate (s         Avedinstancestate);         Setcontentview (R.layout.activity_main);         LinearLayout root= (linearlayout) Findviewbyid (r.id.root);         Create an object that you inherit from view final Drawview drawview=new Drawview (this);         Sets the maximum width and height of the custom component Drawview.setminimumwidth (300);             Drawview.setminimumheight (500); Bind Tounch Event Drawview.setontouchlistener for Drawview component (new View.ontouchlistener () {public Boolean OnT                Ouch (View V, motionevent event) {LOG.E ("OnTouch", "OnTouch");                 Drawview.currentx=event.getx ();                  Drawview.currenty=event.gety (); Notifies the Drawview component to redraw DRawview.invalidate ();             Returns true to indicate that the method has handled the event return true;         }         });     Root.addview (Drawview); }}

In the Main.xml:

<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:background= "#00FFCC"//define background color    android:id= "@+id/root" > </ Linearlayout>   

Final Result:

Android footstep---ball with finger movement