Android图形绘制之——简单的几何图形

public class MyView extends View{
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
}

/**
* 重写绘制方法
*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawColor(Color.BLACK);//绘制黑色背景
Paint paint = new Paint();//创建画笔
paint.setColor(Color.RED);//设置画笔颜色为红色
canvas.drawRect(10, 10, 110, 110, paint);//绘制矩形
canvas.drawText("这是字符串", 10, 130, paint);//字符串，以字符串下面为基准
RectF rf1 = new RectF(10,130,110,230);//定义一个矩形
canvas.drawArc(rf1, 0, 45, true, paint);//画弧，顺时针
canvas.drawLine(150, 10, 250, 110, paint);//画线
RectF rf2 = new RectF(150,130,250,230);//定义一个矩形
canvas.drawOval(rf2,paint);//根据矩形画一个圆
}
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".ui.activity.MyViewActivity">

<testku.mygame.ui.myview.MyView
android:layout_width="match_parent"
android:layout_height="match_parent"/>

</LinearLayout>