Android 简单图形绘制

绘制一个矩形

package rw.Draw;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.Shader;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.RectShape;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.View;

public class Drwa02Activity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Draw draw=new Draw(this);
        setContentView(draw);
    }
    public class Draw extends View{
     private ShapeDrawable shapeDrawable;//ShapeDrawable继承来自Drawable类，可以随便绘制二维图形
		public Draw(Context context) {
			super(context);
			// TODO Auto-generated constructor stub
			
			shapeDrawable=new ShapeDrawable(new RectShape());
			shapeDrawable.getPaint().setColor(Color.RED);
			shapeDrawable.setBounds(20, 20, 400, 200); //shapeDrawable.setBounds(left, top, right, bottom);
	        	
		}
    	protected void onDraw(Canvas canvas){
    		shapeDrawable.draw(canvas);
    	}
    }
}