btn_savewhbstock.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub

            if(isInternetPresent){
                updateData();
            }else{
                Myreceiver = new BroadcastReceiver() {

                    @Override
                    public void onReceive(Context context, Intent intent) {
                        // TODO Auto-generated method stub
                        final ConnectivityManager connMgr = (ConnectivityManager) context
                                .getSystemService(Context.CONNECTIVITY_SERVICE);

                        final android.net.NetworkInfo wifi = connMgr
                                .getNetworkInfo(ConnectivityManager.TYPE_WIFI);

                        final android.net.NetworkInfo mobile = connMgr
                                .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);


                        if(wifi.isConnectedOrConnecting() || mobile.isConnectedOrConnecting()){

                            alertNetworkAvailability();
                            writeToFile();
                            Toast.makeText(WhbStockDetails.this, "Data writing", Toast.LENGTH_LONG).show();

                            Log.e("Network is not available", "data writing to local database");
                            Toast.makeText(WhbStockDetails.this, "network is not working", Toast.LENGTH_LONG).show();
                        } else if (wifi.isConnected() || mobile.isConnected()) {
                            // Do something
                            readfrominternalstorage();
                            Log.d("Netowk Available ", "Flag No 1");
                            Toast.makeText(WhbStockDetails.this, "network is working", Toast.LENGTH_LONG).show();
                        }




                    }

                };

                IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
                registerReceiver(Myreceiver, filter);

            }

        }

    });
}


public void writeToFile(){

    traceFile = new File(((WhbStockDetails.this).getExternalFilesDir(null)), FILE_NAME);
    if(!traceFile.exists())
    {
        try{
            BufferedWriter writer = new BufferedWriter(new FileWriter(traceFile, true /*append*/));
            writer.append("A+ve: ");
            writer.write(apos);
            writer.newLine();
            writer.append("B+ve: ");
            writer.write(bpos);
            writer.newLine();
            writer.append("O+ve: ");
            writer.write(opos);
            writer.newLine();
            writer.append("AB+ve: ");
            writer.write(abpos);
            writer.newLine();
            writer.append("BMBY+ve: ");
            writer.write(bmbypos);
            writer.newLine();
            writer.append("A-ve: ");
            writer.write(aneg);
            writer.newLine();
            writer.append("B-ve: ");
            writer.write(bneg);
            writer.newLine();
            writer.append("O-ve: ");
            writer.write(oneg);
            writer.newLine();
            writer.append("AB-ve: ");
            writer.write(abneg);
            writer.newLine();
            writer.append("BMBY-ve: ");
            writer.write(bmbyneg);
            writer.newLine();
            writer.write("-end-");
            writer.newLine();
            writer.close();
        }catch(Exception e){
            Log.e("WhbStockDetails.writeToFile", "IOException"+e);
        }
    }


}