android 网速刻度盘 自定义view一

第一次写博客，有点小激动，哈哈。

转载请标明出处 http://blog.csdn.net/u012840567/article/details/52860559

这个是网速显示刻度盘的一个功能，我找了很多资料都没有合适的，就只有自己写了，
找的资料基本都是只有半个圈的刻度盘，并且刻度颜色变化也很少，都是圆弧在变色，所以自己动手写了一个 刻度可以边颜色 刻度盘也不止半圈。

下一篇做的修改：http://blog.csdn.net/u012840567/article/details/52875214

如图在输入框里面输入整数，支持0-20480kb/s 也就是20M 部分截图

@Overrideprotected void onDraw(Canvas canvas) {    super.onDraw(canvas);    init();    int center = getWidth()/2; //获取圆心的x坐标    int radius = (int) (center - 60); //圆环的半径 为了显示刻度上的网速字体-60     RectF oval = new RectF(center - radius, center - radius, center            + radius, center + radius);//用于定义的圆弧的形状和大小的界限        drawFont(canvas,center,radius,oval);//画数字汉字        drawCircle(canvas,center,radius,oval);//画圆弧        drawLine(canvas,center,radius,oval);//画刻度线}

下面分别3个部分代码，包括自己之前的思路，注释掉了

private void drawFont(Canvas canvas, int center, int radius, RectF oval) {        int centerSize = 100;//中间字体的大小        centerPaint.setColor(Color.DKGRAY);        centerPaint.setStrokeWidth(0);        centerPaint.setTypeface(Typeface.DEFAULT_BOLD);        centerPaint.setTextSize(centerSize);    float textWidth = centerPaint.measureText(centerfont);   //测量字体宽度，我们需要根据字体的宽度设置在圆环中间    canvas.drawText(centerfont,center-textWidth/2,center+centerSize/2-10,centerPaint);    speedPaint.setColor(Color.DKGRAY);    speedPaint.setStrokeWidth(0);    speedPaint.setTypeface(Typeface.DEFAULT_BOLD);    speedPaint.setTextSize(40);    float speedTextWidth = speedPaint.measureText(speedFont);   //测量字体宽度，我们需要根据字体的宽度设置在圆环中间    canvas.drawText(speedFont,center-speedTextWidth/2,center + (int)(radius * Math.sin(degree) - speedTextWidth/4),speedPaint);    outSpeedPaint.setColor(Color.DKGRAY);    outSpeedPaint.setStrokeWidth(0);    outSpeedPaint.setTypeface(Typeface.DEFAULT_BOLD);    outSpeedPaint.setTextSize(20);    //String[] outSpeed = {"0M","1M","5M","10M","20M","50M","100M"};    String[] outSpeed = {"0","256k","512k","1M","5M","10M","20M"};    //这里计算的刻度上面的网速字体位置，一个一个调试的，不知道有没有什么快速算法    for (int i= 0 ; i < outSpeed.length ; i++){        float outSpeedTextWidth = outSpeedPaint.measureText(outSpeed[i]);        switch (i){            case 0:                canvas.drawText(outSpeed[0],center - (int)(radius * Math.sin(degree)) + outSpeedTextWidth/2,center + (int)(radius * Math.sin(degree)) ,outSpeedPaint);                break;            case 1:                canvas.drawText(outSpeed[1],0,center+outSpeedTextWidth/4,outSpeedPaint);                break;            case 2:                canvas.drawText(outSpeed[2],center - (int)(radius * Math.sin(degree)) - outSpeedTextWidth/4,center - (int)(radius * Math.sin(degree)) + outSpeedTextWidth/4,outSpeedPaint);                break;            case 3:                canvas.drawText(outSpeed[3],center-outSpeedTextWidth/2,outSpeedTextWidth,outSpeedPaint);                break;            case 4:                canvas.drawText(outSpeed[4],center + (int)(radius * Math.sin(degree)) - outSpeedTextWidth/2,center - (int)(radius * Math.sin(degree)) + outSpeedTextWidth/2,outSpeedPaint);                break;            case 5:                canvas.drawText(outSpeed[5],center+radius+outSpeedTextWidth/2,center+outSpeedTextWidth/4,outSpeedPaint);                break;            case 6:                canvas.drawText(outSpeed[6],center + (int)(radius * Math.sin(degree)) - outSpeedTextWidth,center + (int)(radius * Math.sin(degree)) ,outSpeedPaint);                break;        }    }}private void drawLine(Canvas canvas,int center,int radius,RectF oval) {    linePaint.setColor(Color.RED);    linePaint.setStyle(Paint.Style.STROKE);    linePaint.setStrokeWidth(10);    linePaint.setAntiAlias(true);    linePaint2.setColor(Color.DKGRAY);    linePaint2.setStyle(Paint.Style.STROKE);    linePaint2.setStrokeWidth(10);    linePaint2.setAntiAlias(true);    int linew = center;    int lineh = center;    //旋转的角度    float rAngle = 360f / 8;    int startx = 50;    int starty = lineh;    int stopx = 90;    int stopy = lineh;    canvas.drawLine(startx,starty,stopx,stopy,linePaint);    //通过旋转画布 绘制右面的刻度    for (int i = 0; i < 5; i++) {        canvas.rotate(rAngle, linew, lineh);        canvas.drawLine(startx,starty,stopx,stopy,linePaint);    }    //现在需要将将画布旋转回来    canvas.rotate(-rAngle * 5, linew, lineh);    for (int i = 0; i < 1; i++) {        canvas.rotate(-rAngle, linew, lineh);        canvas.drawLine(startx,starty,stopx,stopy,linePaint);    }    //现在需要将将画布旋转回来    canvas.rotate(rAngle * 1, linew, lineh);    //这里是从左边开始画的刻度，为了显示原因，我才这样写的，下面注释掉的部分是从上面开始画刻度的    //这里也是调出来的，我也想在左下角开始的，奈何算不出来位置，一直有偏差，所以选的左边，左下角那个可以到转来-45°    if (lineDegree == 0){    }else if (lineDegree>0 && lineDegree<45){        for (int i = 0; i < 1; i++) {            canvas.rotate(-rAngle, linew, lineh);            canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        }        //现在需要将将画布旋转回来        canvas.rotate(rAngle * 1, linew, lineh);    }else if (lineDegree==45){        canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        for (int i = 0; i < 1; i++) {            canvas.rotate(-rAngle, linew, lineh);            canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        }        //现在需要将将画布旋转回来        canvas.rotate(rAngle * 1, linew, lineh);    }else if (lineDegree>45 && lineDegree < 270){        canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        for (int i = 0; i < 1; i++) {            canvas.rotate(-rAngle, linew, lineh);            canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        }        //现在需要将将画布旋转回来        canvas.rotate(rAngle * 1, linew, lineh);        if (lineDegree == 90 || lineDegree == 135 || lineDegree == 180 || lineDegree == 225){            //通过旋转画布 绘制右面的刻度            for (int i = 0; i < lineDegree/rAngle-1; i++) {                canvas.rotate(rAngle, linew, lineh);                canvas.drawLine(startx,starty,stopx,stopy,linePaint2);            }            //现在需要将将画布旋转回来            canvas.rotate(-rAngle * lineDegree/rAngle-1, linew, lineh);        }else {            //通过旋转画布 绘制右面的刻度            for (int i = 0; i < lineDegree/rAngle-2; i++) {                canvas.rotate(rAngle, linew, lineh);                canvas.drawLine(startx,starty,stopx,stopy,linePaint2);            }            //现在需要将将画布旋转回来            canvas.rotate(-rAngle * lineDegree/rAngle-2, linew, lineh);        }    }else if(lineDegree == 270){        canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        for (int i = 0; i < 1; i++) {            canvas.rotate(-rAngle, linew, lineh);            canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        }        //现在需要将将画布旋转回来        canvas.rotate(rAngle * 1, linew, lineh);        //通过旋转画布 绘制右面的刻度        for (int i = 0; i < lineDegree/rAngle-1; i++) {            canvas.rotate(rAngle, linew, lineh);            canvas.drawLine(startx,starty,stopx,stopy,linePaint2);        }        //现在需要将将画布旋转回来        canvas.rotate(-rAngle * lineDegree/rAngle-1, linew, lineh);    }}private void drawCircle(Canvas canvas,int center,int radius,RectF oval) {    //默认外圈点为135-270 系统默认最上面为0° 逆时针旋转度数 就是135°  然后以当前为起点顺时针旋转270°    outPaint.setColor(Color.RED);    outPaint.setStyle(Paint.Style.STROKE);//设置空心    outPaint.setStrokeWidth(20);    outPaint.setAntiAlias(true);//消除锯齿    canvas.drawArc(oval,135,270,false,outPaint);    //覆盖的颜色，lineDegree 为计算出来的旋转量    innerPaint.setColor(Color.DKGRAY);    innerPaint.setStyle(Paint.Style.STROKE);//设置空心    innerPaint.setStrokeWidth(20);    innerPaint.setAntiAlias(true);//消除锯齿    canvas.drawArc(oval,135,lineDegree,false,innerPaint);}

下面附上参考链接和下载
参考链接:http://blog.csdn.net/xiaanming/article/details/10298163
http://blog.sina.com.cn/s/blog_4cd5d2bb0101g2la.html
http://blog.csdn.net/wingichoy/article/details/50468674

demo下载地址:http://download.csdn.net/detail/u012840567/9658138