MPChartExample/src/com/xxmassdeveloper/mpchartexample/fragments/PieChartFrag.java

package com.xxmassdeveloper.mpchartexample.fragments;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.text.SpannableString;
import android.text.style.ForegroundColorSpan;
import android.text.style.RelativeSizeSpan;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.github.mikephil.charting.charts.PieChart;
import com.github.mikephil.charting.components.Legend;
import com.github.mikephil.charting.components.Legend.LegendPosition;
import com.xxmassdeveloper.mpchartexample.R;


public class PieChartFrag extends SimpleFragment {

    public static Fragment newInstance() {
        return new PieChartFrag();
    }

    private PieChart mChart;
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.frag_simple_pie, container, false);
        
        mChart = (PieChart) v.findViewById(R.id.pieChart1);
        mChart.setDescription("");
        
        Typeface tf = Typeface.createFromAsset(getActivity().getAssets(), "OpenSans-Light.ttf");
        
        mChart.setCenterTextTypeface(tf);
        mChart.setCenterText(generateCenterText());
        mChart.setCenterTextSize(10f);
        mChart.setCenterTextTypeface(tf);
         
        // radius of the center hole in percent of maximum radius
        mChart.setHoleRadius(45f);
        mChart.setTransparentCircleRadius(50f);
        
        Legend l = mChart.getLegend();
        l.setPosition(LegendPosition.RIGHT_OF_CHART);
        
        mChart.setData(generatePieData());
        
        return v;
    }

    private SpannableString generateCenterText() {
        SpannableString s = new SpannableString("Revenues\nQuarters 2015");
        s.setSpan(new RelativeSizeSpan(2f), 0, 8, 0);
        s.setSpan(new ForegroundColorSpan(Color.GRAY), 8, s.length(), 0);
        return s;
    }
}