Multiple dialogs creation in Android

Multiple dialogs creation in Android is a common problem .Let's seek solution to it

Today we will discuss on how to avoid creation of multiple dialog from the same piece of code.

The key is to maintain a counter and if its 0 , that means no dialog is showing now then only show a dialog. And on every dismissal of the dialog we reduce that counter to maintain the count of the dialog shown . That means at one time it should be not more than one .
 
   //the counter to maintain the showing status of the dialog
   private static int dialog_count =0;
    private Dialog dialog=null;
   
    public void showAlertDialog(final Context context, Activity activity) {

        ListAdapter arrayAdapter;
        final ArrayList<Language> arraylist = new ArrayList<>();
        Integer[] imageId = {
                R.drawable.british_english_flag,
                R.drawable.swedish_flag_small,
                R.drawable.italian_flag
        };

        final String[] languages = context.getResources().getStringArray(R.array.language_list);
        for (int i = 0; i < languages.length; i++) {
            Language langObj = new Language(languages[i].substring(3, languages[i].length()), imageId[i]);
            arraylist.add(langObj);
        }
        arrayAdapter = new LanguageArrayAdpater(activity, arraylist);

        dialog = new Dialog(mContext);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

     
        View view = mActivity.getLayoutInflater().inflate(R.layout.dialog_layout, null);

        ListView lv = (ListView) view.findViewById(R.id.listView_language);
        TextView tv_header = (TextView) view.findViewById(R.id.dialog_header);
        tv_header.setTypeface(Utility.setTypeFace(Defines.font_OpenSansRegular));

        lv.setAdapter(arrayAdapter);

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String selectedVal = arraylist.get(position).getName();
                Log.d(TAG, "chosen " + selectedVal);
                dialog.dismiss();
//if an item is selected and the dialog was showing then reduce the dialog counter and perform the required action
                if(dialog_count>0)
                    dialog_count--;
                saveInPrefs(languages,context, position, selectedVal);
            }
        });

        dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
            @Override
            public void onDismiss(DialogInterface dialog) {
                System.out.println("dialog count dismissing :"+ dialog_count);
//if the dialog was cancelable then on dismissing it we reduce the count so that we have proper data in the counter
                if(dialog_count>0)
                    dialog_count--;
                System.out.println("dialog count dismissed :"+ dialog_count);
            }
        });
        dialog.setContentView(view);
//show the dialog only if we have no dialog showing currently.
        if(dialog_count==0) {
            dialog.show();
            dialog_count++;
        }