custom circle view

AttendanceCircleView.java

package com.sandftechnologies.schoolmanagement.CustomView;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;

/**
 * Created by ASWIN on 7/15/2017.
 */

public class AttendanceCircleView extends View {
    private Paint backgroundPaint;
    private Paint whitePaint;
    private RectF bounds,boarderbounds;
    private float ViewHeight,ViewWidth;
    private float textsize;
    private Paint boarderPaint;
    private String nominator="",denominator="";
    private Paint stringPaint;
    private DisplayMetrics metrics;
    private float boarderPaintWidth;
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        bounds=new RectF();
        boarderbounds=new RectF();
        ViewHeight=getMeasuredHeight();
        ViewWidth=getMeasuredWidth();
        if(ViewWidth>ViewHeight){
            ViewWidth=ViewHeight;
        }else {
            ViewHeight=ViewWidth;
        }
        bounds.set(0,0,ViewWidth,ViewHeight);
        boarderbounds.set(boarderPaintWidth/2f,boarderPaintWidth/2f,ViewWidth-boarderPaintWidth/2f,ViewHeight-boarderPaintWidth/2f);
        textsize=ViewHeight/5;
    }

    public void setNominator(String s){
        this.nominator=s;
        invalidate();
    }
    public void setDenominator(String s){
        this.denominator=s;
        invalidate();
    }



    public AttendanceCircleView(Context context, AttributeSet attrs) {
        super(context, attrs);

        metrics = getResources().getDisplayMetrics();
        int densityDpi = (int)(metrics.density * 160f);
        Log.d("$#####", "AttendanceCircleView: "+densityDpi);
        boarderPaintWidth = 4*(densityDpi/160);

        backgroundPaint=new Paint();
        backgroundPaint.setAntiAlias(true);
        backgroundPaint.setStyle(Paint.Style.FILL);
        backgroundPaint.setColor(Color.parseColor("#3498db"));

        whitePaint=new Paint();
        whitePaint.setAntiAlias(true);
        whitePaint.setStyle(Paint.Style.FILL);
        whitePaint.setColor(Color.parseColor("#ffffff"));
        whitePaint.setStrokeWidth(boarderPaintWidth);

        stringPaint=new Paint();
        stringPaint.setAntiAlias(true);
        stringPaint.setStyle(Paint.Style.FILL);
        stringPaint.setColor(Color.parseColor("#ffffff"));
        stringPaint.setStrokeWidth(9);


        boarderPaint=new Paint();
        boarderPaint.setAntiAlias(true);
        boarderPaint.setStyle(Paint.Style.STROKE);
        boarderPaint.setColor(Color.parseColor("#ffffff"));
        boarderPaint.setStrokeWidth(boarderPaintWidth);

    }

    @Override
    protected void onDraw(Canvas canvas) {

        canvas.drawOval(bounds,backgroundPaint);
        canvas.drawLine(ViewWidth*15/100,ViewHeight/2f,ViewWidth-(ViewWidth*15/100),ViewHeight/2f,whitePaint);

        float textwidth=whitePaint.measureText (nominator)+stringPaint.measureText(" absent");
        float x=textwidth/2f;

        canvas.drawText(nominator,(ViewWidth/2f)-x,ViewHeight/2f-(ViewHeight*5/100),whitePaint);
        canvas.drawText(" absent",(((ViewWidth/2f)-x)+whitePaint.measureText (nominator)),ViewHeight/2f-(ViewHeight*5/100),stringPaint);


        float totalDenominatorLength=whitePaint.measureText (denominator)+stringPaint.measureText(" days");
        float p=totalDenominatorLength/2f;
        float[] dimensArray=getDenominatorBounds(whitePaint,denominator,stringPaint," days");
        canvas.drawText(denominator,((ViewWidth/2f)-p),(ViewHeight/2f+(ViewHeight*5/100)+dimensArray[1]),whitePaint);
        canvas.drawText(" days",(((ViewWidth/2f)-p)+whitePaint.measureText (denominator)),ViewHeight/2f+(ViewHeight*5/100)+dimensArray[3],stringPaint);

        canvas.drawOval(boarderbounds,boarderPaint);
        super.onDraw(canvas);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        ViewWidth=w;
        ViewHeight=h;

        if(ViewWidth>ViewHeight){
            ViewWidth=ViewHeight;
        }else {
            ViewHeight=ViewWidth;
        }

        float desiredWidth=ViewWidth-(ViewWidth*(15/100));
        setTextSizeForWidth(whitePaint,desiredWidth,"15",stringPaint);
        //15 is a dummy value for getting desired text size when scaling
    }

    private float[] getDenominatorBounds(Paint paint,String text, Paint paint2,String text2){
        float[] dimArray=new float[]{1,1,1,1};
        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);

        dimArray[0]=bounds.width();
        dimArray[1]=bounds.height();

        Rect bounds2=new Rect();
        paint2.getTextBounds(text2,0,text2.length(),bounds2);

        dimArray[2]=bounds2.width();
        dimArray[3]=bounds2.height();

        return  dimArray;
    }



    private static void setTextSizeForWidth(Paint paint, float desiredWidth,
                                            String text,Paint stringPaint) {
        // Pick a reasonably large value for the test. Larger values produce
        // more accurate results, but may cause problems with hardware
        // acceleration. But there are workarounds for that, too; refer to
        // http://stackoverflow.com/questions/6253528/font-size-too-large-to-fit-in-cache
        final float testTextSize = 1f;

        // Get the bounds of the text, using our testTextSize.
        paint.setTextSize(testTextSize);
        Rect bounds = new Rect();
        paint.getTextBounds(text, 0, text.length(), bounds);

        // Calculate the desired size as a proportion of our testTextSize.
        float desiredTextSize;
        if(bounds.width()<bounds.height()) {
            desiredTextSize = testTextSize * desiredWidth / bounds.width();

        }else {
            desiredTextSize = testTextSize * desiredWidth / bounds.width();
        }
        desiredTextSize = desiredTextSize / 1.5f;
        // Set the paint for that size.
        paint.setTextSize(desiredTextSize);
        paint.setTextScaleX(.75f);

        stringPaint.setTextSize(desiredTextSize/3.5f);
    }
}