Generate 3D Pie Chart using Google Chart Tools

package com.Android3dPieChart;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class Android3dPieChartActivity extends Activity {
 
 final static String urlGoogleChart 
  = "http://chart.apis.google.com/chart";
 final static String urlp3Api 
  = "?cht=p3&chs=400x150&chl=A|B|C&chd=t:";
 
 EditText inputA, inputB, inputC;
 Button generate;
 ImageView pieChart;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        inputA = (EditText)findViewById(R.id.adata);
        inputB = (EditText)findViewById(R.id.bdata);
        inputC = (EditText)findViewById(R.id.cdata);
        generate = (Button)findViewById(R.id.generate);
        pieChart = (ImageView)findViewById(R.id.pie);
        generate.setOnClickListener(generateOnClickListener);
    }
    
    Button.OnClickListener generateOnClickListener
    = new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   // TODO Auto-generated method stub
   String A = inputA.getText().toString();
   String B = inputB.getText().toString();
   String C = inputC.getText().toString();
   String urlRqs3DPie = urlGoogleChart 
     + urlp3Api 
     + A + "," + B + "," + C;
   
   Bitmap bm3DPie = loadChart(urlRqs3DPie);
   if(bm3DPie == null){
    Toast.makeText(Android3dPieChartActivity.this,
      "Problem in loading 3D Pie Chart",
      Toast.LENGTH_LONG).show(); 
   }else{
    pieChart.setImageBitmap(bm3DPie); 
   }
  }};
  
 private Bitmap loadChart(String urlRqs){
  Bitmap bm = null;
  InputStream inputStream = null;
  
  try {
   inputStream = OpenHttpConnection(urlRqs);
   bm = BitmapFactory.decodeStream(inputStream);
   inputStream.close(); 
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace(); 
  }
  
  return bm; 
 }
     
 private InputStream OpenHttpConnection(String strURL) throws IOException{
  InputStream is = null;
  URL url = new URL(strURL);
  URLConnection urlConnection = url.openConnection();
       
  try{
   HttpURLConnection httpConn = (HttpURLConnection)urlConnection;
   httpConn.setRequestMethod("GET");
   httpConn.connect();
   
   if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
    is = httpConn.getInputStream();  
   } 
  }catch (Exception ex){
  }
  
  return is;  
 }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
<LinearLayout
 android:orientation="horizontal"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content">
<TextView  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="A "
    />
<EditText 
    android:id="@+id/adata"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:inputType="number" />
</LinearLayout>
<LinearLayout
 android:orientation="horizontal"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content">
<TextView  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="B "
    />
<EditText 
    android:id="@+id/bdata"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:inputType="number" />
</LinearLayout>
<LinearLayout
 android:orientation="horizontal"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content">
<TextView  
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="C "
    />
<EditText 
    android:id="@+id/cdata"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:inputType="number" />
</LinearLayout>
<Button 
    android:id="@+id/generate"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Generate 3D Pie Chart"
    />
<ImageView
    android:id="@+id/pie"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>