Android 简单图形绘制

Android 简单绘制一个矩形：

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）;
}
}
}