Android Stub uninstalling the existing client and launching another client

This Android Application uninstall prior version of client from the device. It checks for the newer version of client on the device and launch it. There is usage of onActivityResult method which shows how to wait till previous Intent is getting completed (returning its result).

import android.app.Activity;
import android.os.Bundle;
import android.net.Uri;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;

public class PreCachingIssueApp extends Activity
{
   private final static int    UNINSTALL_REQUEST_CODE = 0;

   private final static String m_sPackageToUninstall  = "com.test"; //old client to be uninstall

//client installed from market place
   private final static String m_sPackageToLaunch     = "com.google.android.CalculatorCheck";
   private final static String m_sClassToLaunch       = "com.google.android.CalculatorCheck.Calculator";

//wap url to be opened - just an example set google.com   
private final static String m_sWebUrl              = "http://google.com";

   public void onCreate(Bundle savedInstanceState)
   {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

      // Check for the previous Client and uninstall it
      try
      {
         // Check if the package exist or not
         PackageManager oPackageManager = getPackageManager();
         PackageInfo oPackageInfo = oPackageManager.getPackageInfo(m_sPackageToUninstall, PackageManager.GET_ACTIVITIES);
         if (oPackageInfo != null)
         {
            Uri oPackageUri = Uri.parse("package:" + m_sPackageToUninstall);
            Intent oIntent = new Intent(Intent.ACTION_DELETE, oPackageUri);
            // wait till the uninstall is not completed
           startActivityForResult(oIntent, UNINSTALL_REQUEST_CODE);
         }
         else
         {
            launchApp();
         }
      }
      catch (NameNotFoundException e)
      {
         launchApp();
      }
   }

   private void launchApp()
   {
      // Launch the new client from another vendor if it is installed on the device else launch the WAP Mobile TV url
      try
      {
         // Check if the package exist or not
         PackageManager oPackageManager = getPackageManager();
         PackageInfo oPackageInfo = oPackageManager.getPackageInfo(m_sPackageToLaunch, PackageManager.GET_ACTIVITIES);
         if (oPackageInfo != null)
         {
            Intent oNewClientIntent = new Intent(Intent.ACTION_MAIN);
            oNewClientIntent.setComponent(new ComponentName(m_sPackageToLaunch, m_sClassToLaunch));
            // launch the new client
            startActivity(oNewClientIntent);
         }
         else
         {
            Intent oIntent = new Intent(Intent.ACTION_VIEW);
            oIntent.setData(Uri.parse(m_sWebUrl));
            // launch the web url
            startActivity(oIntent);
         }
      }
      catch (NameNotFoundException e)
      {
         Intent oIntent = new Intent(Intent.ACTION_VIEW);
         oIntent.setData(Uri.parse(m_sWebUrl));
         startActivity(oIntent);
      }

     // make sure this stub application will kill itself once user will exit from the application launched by     
     // the stub 
     super.onDestroy();
      finish();
   }

   protected void onActivityResult(int nRequestCode, int nResultCode, Intent oIntent)
   {
      super.onActivityResult(nRequestCode, nResultCode, oIntent);

      if (nRequestCode == UNINSTALL_REQUEST_CODE)
      {
         launchApp();
      }
   }
}