Android绘图API自定义View（三）

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运行效果：

自定义View类：CustomViewDraw.java

public class CustomViewDraw extends View {
    private Paint paint;
    private float degrees=0;
    public CustomViewDraw(Context context) {
        super(context);
        initProperties();
    }

    public CustomViewDraw(Context context,AttributeSet attrs) {
        super(context, attrs);
        initProperties();
    }

    public CustomViewDraw(Context context,AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initProperties();
    }
    private void initProperties(){//初始化数据
        paint=new Paint();
        paint.setColor(Color.RED);
    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);

        canvas.save();//保存当前画布状态
        canvas.translate(400,400);//view的位置
        canvas.rotate(degrees,50,50);//视图旋转
        canvas.drawRect(0,0,100,100,paint);//绘制的图形
        degrees++;
        canvas.restore();//恢复画布状态
        invalidate();//视图重绘，结束视图
    }
}

View视图布局：

<?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"
    tools:context=".MainActivity">


    <com.example.custombutton.CustomViewDraw
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

参考博客：

https://www.jianshu.com/p/afa06f716ca6

https://www.jianshu.com/p/f69873371763