สร้างกราฟ Pie Chart บน Android ด้วย AChartEngine

package com.devahoy.sample.achartengine;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;

public class MainActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment())
                    .commit();
        }
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {}

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

}

private void initData() {
    String[] codename = {
            "KitKat", "Jelly Bean", "Ice Cream Sandwich",
            "Gingerbread", "Froyo"
    };

    double[] values = {13.6, 58.4, 12.3, 14.9, 0.8 };
    String[] colors = {
            "#ff4444", "#99cc00", "#aa66cc", "#33b5e5", "#ffbb33"
    };
}

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

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

    renderer.addSeriesRenderer(seriesRenderer);
}

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

drawChart(series, renderer);

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

    <RelativeLayout
        android:id="@+id/graph_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />


</RelativeLayout>

private View mView;

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

private void drawChart(CategorySeries series,
                               DefaultRenderer renderer) {
    GraphicalView graphView =
            ChartFactory.getLineChartView(getActivity(), series, renderer);

    RelativeLayout container =
            (RelativeLayout) mView.findViewById(R.id.graph_container);

    container.addView(graphView);
}