Android自定义View实现自动转圈效果

2023-09-13 00:51:04 71

packagewidget; importandroid.content.Context; importandroid.content.res.TypedArray; importandroid.graphics.Canvas; importandroid.graphics.Color; importandroid.graphics.Paint; importandroid.graphics.RectF; importandroid.support.annotation.Nullable; importandroid.util.AttributeSet; importandroid.view.View; importcom.bwie.zdycircle.R; importjava.util.Timer; importjava.util.TimerTask; /** *CreatedbyAdministratoron2017/12/7. */ publicclassMyPbextendsView{ privatefloatradius,cx,cy; privatePaintpaint; privatefloatsweepAngle;//旋转角度 publicMyPb(Contextcontext){ super(context,null); } publicMyPb(Contextcontext,@NullableAttributeSetattrs){ super(context,attrs); //获取自定义的属性 TypedArraya=context.obtainStyledAttributes(attrs,R.styleable.MyPb); //获取颜色 intcolor=a.getColor(R.styleable.MyPb_circle_color,Color.BLACK);//获取不到给默认值 radius=a.getDimension(R.styleable.MyPb_circle_radius,20); cx=a.getDimension(R.styleable.MyPb_circle_x,100); cy=a.getDimension(R.styleable.MyPb_circle_y,100); //需要回收 a.recycle(); paint=newPaint(); paint.setAntiAlias(true);//抗锯齿 paint.setColor(color); paint.setStyle(Paint.Style.STROKE);//空心 Timertimer=newTimer(); timer.schedule(newTimerTask(){ @Override publicvoidrun(){ if(sweepAngle>360){ return; } sweepAngle+=1; postInvalidate(); } },1000,20);//每隔20毫秒执行一次 } @Override protectedvoidonDraw(Canvascanvas){ paint.setColor(Color.BLUE); paint.setStrokeWidth(10); canvas.drawCircle(cx,cy,radius,paint);//画圆 paint.setStrokeWidth(20);//粗细 //画运动的轨迹 paint.setColor(Color.RED); //上下左右与圆重合，左边为圆心的横坐标减去半径，上边为纵坐标减去半径,以此类推 RectFrectF=newRectF(cx-radius,cy-radius,cx+radius,cy+radius); //起始角度，旋转角度，第三个属性为是否填充，画笔 canvas.drawArc(rectF,-90,sweepAngle,false,paint); //绘制文字 intprogress=(int)(sweepAngle/360f*100); paint.setTextSize(50); paint.setStrokeWidth(0); paint.setColor(Color.BLACK); canvas.drawText(progress+"%",cx-20,cy,paint); } }

Android自定义View实现自动转圈效果

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