สร้างกราฟ Pie Chart บน Android ด้วย AChartEngine

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package com.devahoy.sample.achartengine;
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import android.support.v7.app.ActionBarActivity;
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import android.support.v7.app.ActionBar;
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import android.support.v4.app.Fragment;
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import android.os.Bundle;
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import android.view.LayoutInflater;
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import android.view.Menu;
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import android.view.MenuItem;
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import android.view.View;
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import android.view.ViewGroup;
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import android.os.Build;
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public class MainActivity extends ActionBarActivity {
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    @Override
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    protected void onCreate(Bundle savedInstanceState) {
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        super.onCreate(savedInstanceState);
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        setContentView(R.layout.activity_main);
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        if (savedInstanceState == null) {
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            getSupportFragmentManager().beginTransaction()
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                    .add(R.id.container, new PlaceholderFragment())
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                    .commit();
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        }
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    }
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    /**
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     * A placeholder fragment containing a simple view.
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     */
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    public static class PlaceholderFragment extends Fragment {
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        public PlaceholderFragment() {}
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        @Override
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        public View onCreateView(LayoutInflater inflater, ViewGroup container,
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                Bundle savedInstanceState) {
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            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
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            return rootView;
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        }
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    }
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}

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private void initData() {
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    String[] codename = {
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            "KitKat", "Jelly Bean", "Ice Cream Sandwich",
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            "Gingerbread", "Froyo"
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    };
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    double[] values = {13.6, 58.4, 12.3, 14.9, 0.8 };
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    String[] colors = {
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            "#ff4444", "#99cc00", "#aa66cc", "#33b5e5", "#ffbb33"
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    };
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}

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CategorySeries series = new CategorySeries("Android Platform Version");
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int length = codename.length;
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for (int i = 0; i < length; i++) {
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    series.add(codename[i], values[i]);
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}

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DefaultRenderer renderer = new DefaultRenderer();
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for (int i = 0; i < length; i++) {
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    SimpleSeriesRenderer seriesRenderer = new SimpleSeriesRenderer();
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    seriesRenderer.setColor(Color.parseColor(colors[i]));
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    renderer.addSeriesRenderer(seriesRenderer);
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}

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renderer.setChartTitleTextSize(60);
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renderer.setChartTitle("Android Platform Version");
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renderer.setLabelsTextSize(30);
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renderer.setLabelsColor(Color.GRAY);
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renderer.setLegendTextSize(30);

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drawChart(series, renderer);

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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    xmlns:tools="http://schemas.android.com/tools"
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    android:layout_width="match_parent"
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    android:layout_height="match_parent"
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    android:padding="12dp"
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    tools:context="com.devahoy.sample.achartengine.MainActivity$PlaceholderFragment" >
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    <RelativeLayout
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        android:id="@+id/graph_container"
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        android:layout_width="match_parent"
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        android:layout_height="match_parent" />
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</RelativeLayout>

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private View mView;
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container,
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        Bundle savedInstanceState) {
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    View rootView = inflater.inflate(R.layout.fragment_main, container, false);
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    mView = rootView;
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    initData();
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    return rootView;
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}

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private void drawChart(CategorySeries series,
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                               DefaultRenderer renderer) {
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    GraphicalView graphView =
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            ChartFactory.getLineChartView(getActivity(), series, renderer);
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    RelativeLayout container =
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            (RelativeLayout) mView.findViewById(R.id.graph_container);
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    container.addView(graphView);
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}