验证了警报对话框 [英] Validation for Alert dialog

问题描述

大家好，
林在一场比赛中工作，当玩家完成了水平而言，我要求球员在警告对话框上的EditText输入他的名字：

Hi Everyone, Im working in a game and when the player finished the level , Im asking the Player to enter his name on EditText in Alert Dialog :

AlertDialog.Builder builder = new Builder(this);
        LayoutInflater inflater = getLayoutInflater();

        // Inflate and set the layout for the dialog
        // Pass null as the parent view because its going in the dialog layout

        builder.setView(inflater.inflate(R.layout.dialog_name, null))
        // Add action buttons
               .setPositiveButton(R.string.alertName, new DialogInterface.OnClickListener() {
                   @Override
                   public void onClick(DialogInterface dialog, int id) {

                       playerText = (EditText) ((AlertDialog)dialog).findViewById(R.id.username);
                       if(playerText.getText() != null && playerText.getText().length() != 0)
                           Helper.currentPlayer.setName(playerText.getText().toString());
                       //calculate the score

                       // save in data base
                       PlayerDataSource playerDS = new PlayerDataSource(getApplicationContext());
                       playerDS.open();
                       Helper.currentPlayer = playerDS.createPlayer(Helper.currentPlayer.getName(), Helper.currentPlayer.getScore(),
                               Helper.currentPlayer.levels, Helper.currentPlayer.times, LanguageHelper.div);
                       playerDS.close();
                       saveStmc();
                       mainScene.setChildScene(choicesMenu, false, true, true);

                   }
               })
               .setTitle("Please Enter Your name")
               .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int id) {

                   }
               });
        alert = builder.create();

当玩家进入他的名字和preSS 确定（正按钮）我将在数据库中检查该名称的存在与否，如果名字存在：显示吐司和不排除再写名字警报。那怎么办？

When the Player enters his name and press OK (Positive button) I will check in database if the name exists or not, if the name is exist : show Toast and not dismiss the alert to write another name. How to do that?

推荐答案

我已经找到了解决方案，它是基于覆盖的OnClick（）为阳性按钮 AlertDialog 这里是解决方案：

I have found the solution, it is based on overriding the OnClick() for positive button of the AlertDialog and here is the solution:

        AlertDialog.Builder builder = new Builder(this);
        LayoutInflater inflater = getLayoutInflater();

        // Inflate and set the layout for the dialog
        // Pass null as the parent view because its going in the dialog layout

        builder.setView(inflater.inflate(R.layout.dialog_name, null))

               .setPositiveButton(R.string.alertName, new DialogInterface.OnClickListener() {
                   @Override
                   public void onClick(DialogInterface dialog, int id) {


                   }
               })
               .setTitle("Please Enter Your name");
        builder = builder.setCancelable(false);
        alert = builder.create();

        alert.setOnShowListener(new OnShowListener() {

                @Override
                public void onShow(DialogInterface dialog) {
                    alert = (AlertDialog)dialog;
                     Button b = alert.getButton(AlertDialog.BUTTON_POSITIVE);
                     b.setOnClickListener(new View.OnClickListener() {

                         @Override
                         public void onClick(View view) {
                               playerText = (EditText) ((AlertDialog)alert).findViewById(R.id.username);
                               if(playerText.getText() == null || playerText.getText().length() == 0)
                               {

                                   showToastMsg("Please enter valid name");
                               }
                               else
                               {

                                   if(nameIsExist())
                                   {
                                       showToastMsg("Name already exist!!");
                                   }
                                   else
                                   {
                                       //Do stuff because every this is OK
                                       alert.dismiss();
                                   }

                               }

                         }
                     });
                }
            });

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