绘制圆环.docVIP

package com.example.view; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.AttributeSet; import android.view.View; public class CicleView extends View { private final Paint paint; private final Context context; private int banjing = 100; private int width = 30; private String color = #ff0000; public CicleView(Context context) { // TODO Auto-generated constructor stub this(context, null); } public CicleView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub this.context = context; this.paint = new Paint(); this.paint.setAntiAlias(true); //消除锯齿 this.paint.setStyle(Paint.Style.STROKE); //绘制空心圆 } @Override protected void onDraw(Canvas canvas) { // TODO Auto-generated method stub int center = getWidth()/2; int innerCircle = dip2px(context, banjing); //设置内圆半径 int ringWidth = dip2px(context, width); //设置圆环宽度 //绘制内圆 this.paint.setARGB(255, 212 ,225, 233); this.paint.setStrokeWidth(2); canvas.drawCircle(center,center, innerCircle, this.paint); //绘制圆环 this.paint.setColor(Color.parseColor(color)); this.paint.setStrokeWidth(ringWidth); canvas.drawCircle(center,center, innerCircle+1+ringWidth/2, this.paint); //绘制外圆 this.paint.setARGB(155, 167, 190, 206); this.paint.setStrokeWidth(2); canvas.drawCircle(center,center, innerCircle+ringWidth, this.paint); super.onDraw(canvas); } public void circleChange(int banjing,int width,String color){ this.banjing = banjing; this.color = color; this.width = width; postInvalidate();//重新绘制 } /** * 根据手机的分辨率从 dp 的单位 转成为 px(像素) */ public static int dip2px(Context context, float dpValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dpValue * scale + 0.5f); } }