Android 簡單圖形繪制

Android 簡單繪制一個矩形：

1. package rw.Draw;  
2.   
3. import android.app.Activity;  
4. import android.content.Context;  
5. import android.graphics.Canvas;  
6. import android.graphics.Color;  
7. import android.graphics.Rect;  
8. import android.graphics.Shader;  
9. import android.graphics.drawable.ShapeDrawable;  
10. import android.graphics.drawable.shapes.RectShape;  
11. import android.os.Bundle;  
12. import android.util.AttributeSet;  
13. import android.view.View;  
14.   
15. public class Drwa02Activity extends Activity {  
16.     /** Called when the activity is first created. */  
17.     @Override  
18.     public void onCreate(Bundle savedInstanceState) {  
19.         super.onCreate(savedInstanceState);  
20.         Draw draw=new Draw(this);  
21.         setContentView(draw);  
22.     }  
23.     public class Draw extends View{  
24.      private ShapeDrawable shapeDrawable;//ShapeDrawable繼承來自Drawable類，可以隨便繪制二維圖形   
25.         public Draw(Context context) {  
26.             super(context);  
27.             // TODO Auto-generated constructor stub   
28.               
29.             shapeDrawable=new ShapeDrawable(new RectShape());  
30.             shapeDrawable.getPaint().setColor(Color.RED);  
31.             shapeDrawable.setBounds(20, 20, 400, 200); //shapeDrawable.setBounds(left, top, right, bottom);   
32.                   
33.         }  
34.         protected void onDraw(Canvas canvas){  
35.             shapeDrawable.draw(canvas);  
36.         }  
37.     }  
38. }