自定义view实现圆环功能

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package com.bwie.chentong.day03_view;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;public class VirtualKeyView extends View{  private Paint mPaint;    Context mContext;    public VirtualKeyView(Context context) {        super(context);    }    public VirtualKeyView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public VirtualKeyView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint pa=new Paint();        Paint pa1=new Paint();        Paint pa2=new Paint();        float wi=canvas.getWidth()/2;        float he=canvas.getHeight()/2;        pa.setColor(Color.BLUE);//设置颜色为蓝色        pa.setARGB(255,199,33,56);        pa1.setColor(Color.BLUE);        pa2.setColor(Color.WHITE);        pa.setAntiAlias(true);//设置画笔为抗锯齿        pa1.setAntiAlias(true);        pa2.setAntiAlias(true);       // pa1.setStyle(Paint.Style.STROKE);*//*空心圆*//*      canvas.drawColor(Color.WHITE);        canvas.drawCircle(wi,he,90,pa1);        canvas.drawCircle(wi,he,70,pa2);        pa1.setColor(Color.WHITE);        /*canvas.drawCircle(wi-24,he-24,50,pa1);*/        pa1.setStrokeWidth(50);        canvas.drawLine(wi,he,wi-100,he-100,pa1);        canvas.drawCircle(wi,he,60,pa);        canvas.drawText("1508A",wi,he,pa);    }    @Override    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {        super.onLayout(changed, left, top, right, bottom);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        return super.onTouchEvent(event);    }}
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