Installing APK from application

This is a small code sniped about installing an APK from Asset folder in mobile .

Let me know if you face any issues and do comment for feedback.

package com.android.parentapplication;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.res.AssetManager;
import android.net.Uri;
import android.os.Bundle;


public class ParentActivity extends Activity {

// Package name of APK in asset file
private String mInitialApplication = "com.android.initialapplication";



@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_parent);
if (appInstalledOrNot(mInitialApplication)) {
} else {
installAPK();
}
}

/*
* Installs application from Asset folder
*/
public void installAPK() {

AssetManager assetManager = getAssets();

InputStream in = null;
OutputStream out = null;

try {
   in = assetManager.open("InitialApplication.apk");
   out = new FileOutputStream("/sdcard/InitialApplication.apk");

   byte[] buffer = new byte[1024];

   int read;
   while((read = in.read(buffer)) != -1) {

       out.write(buffer, 0, read);

   }

   in.close();
   in = null;

   out.flush();
   out.close();
   out = null;

   Intent intent = new Intent(Intent.ACTION_VIEW);

   intent.setDataAndType(Uri.fromFile(new File("/sdcard/InitialApplication.apk")),
       "application/vnd.android.package-archive");

   startActivity(intent);

} catch(Exception e) {
e.printStackTrace();
}
}


/*
* return
* appInstalled = true
* appUninstalled = false
*/
private boolean appInstalledOrNot(String uri) {
        PackageManager pm = getPackageManager();
        boolean app_installed;
        try {
            pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES);
         
            /*
             * code to derive VersionName and VersionCode
            */
           /* mVersionCode = pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES).versionCode;
            mVersionName = pm.getPackageInfo(uri, PackageManager.GET_ACTIVITIES).versionName;*/
         
         
            app_installed = true;
        }
        catch (PackageManager.NameNotFoundException e) {
            app_installed = false;
        }
        return app_installed;
    }

/*
* Verify version code
*/
public static boolean checkVersionCode(int mVersionCode, int toInstallVersionCode)
{
 return(mVersionCode > toInstallVersionCode);
}

}