自定义View画圆（观察者模式）

来源：互联网发布：安卓手游辅助软件编辑：程序博客网时间：2024/05/20 21:44
***ToothView类***public class ToothView extends View {    //红色    public static final int COLOR_RED=Color.RED;    //画笔的宽度    public static final int PAINT_WIDTH=5;    //圆的半径    public static final int RADIO=40;    //圆位置的X坐标    public static final int X=100;    //圆位置的Y坐标    public static final int Y=100;    //定义一个对象    ClickCirle circleListener;    public ToothView(Context context) {        super(context);    }    public ToothView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public ToothView(Context context, AttributeSet attrs) {        super(context, attrs);    }    //测量高度    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    //绘制图形    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //调用绘制圆的方法        Circle(canvas);    }    //设置布局    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);    }    //绘制圆的方法    public void Circle(Canvas canvas){        //声明一个画笔        Paint paint=new Paint();        //设置画笔的样式、颜色        paint.setColor(COLOR_RED);        //设置空心圆        paint.setStyle(Paint.Style.STROKE);        //设置画笔的宽度        paint.setStrokeWidth(PAINT_WIDTH);        //设置锯齿true表示抗锯齿，false表示不抗锯齿        paint.setAntiAlias(true);        //绘制圆        canvas.drawCircle(X,Y,RADIO,paint);    }    //封装一个监听的方法    public void setCircleListener(ClickCirle circleListener) {        this.circleListener = circleListener;    }    //观察者模式    public  interface  ClickCirle{        //点击的方法        public void  click();    }    @Override    public boolean onTouchEvent(MotionEvent event) {        //获取当前的位置        float x=event.getX();        float y=event.getY();        //调用点击事件方法        ClickWhere(x,y);        return super.onTouchEvent(event);    }    //封装判断点击的方法    public  void  ClickWhere(float x,float y){        int distanx =(int) ((x-X)*(x-X));        int distany =(int) ((y-Y)*(y-Y));        //求和        int sum=distanx+distany;        if(sum<RADIO*RADIO){            //设置观察者            if(null!=circleListener){                circleListener.click();            }        }    }***主方法***public class MainActivity extends AppCompatActivity {     ToothView  tooth_main;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tooth_main = (ToothView)findViewById(R.id.tooth_main);        tooth_main.setCircleListener(new ToothView.ClickCirle() {            @Override            public void click() {                Toast.makeText(getApplicationContext(), "方法被点击", Toast.LENGTH_LONG).show();            }        });    }
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