Question

启动MainActivity后，我会立即显示一个对话框。它会提示用户输入2个参数，一个表号和一个封面号。然后他们确认并且这些参数用于创建Order对象。

然而我遇到的问题是，无论他们是否输入参数，当他们点击确认按钮时该框被解除。我希望该框保持显示并显示一条概述错误的Toast消息。

下面是我的代码，但是当点击按钮时，框会消失并显示toast。

非常感谢。

public Dialog createDialog(){

    AlertDialog.Builder builder = new AlertDialog.Builder(SectionsActivity.this);

    View v = getLayoutInflater().inflate(R.layout.order_dialog, null);
    builder.setView(v);

    tableNum = (EditText)v.findViewById(R.id.numberEntry);
    coverNum = (EditText)v.findViewById(R.id.coversEntry);

    builder.setMessage("Order Information");
    builder.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int id) {

            if(tableNum.getText().length() != 0 && coverNum.length() != 0){
            //Create order object in here
            table = Integer.parseInt(tableNum.getText().toString());
            covers = Integer.parseInt(coverNum.getText().toString());
            Order.getInstance().setTableNumber(table);
            Order.getInstance().setCoverNumber(covers);
            created = true;
            }else{
                Toast.makeText(getApplicationContext(), "Must enter a table and cover number", Toast.LENGTH_SHORT).show();
            }
        }
    });

    return builder.create();
}

编辑：

if(!Order.getInstance().getCreated()){
    Dialog d = createDialog();
    d.show();
    }

Answer 1

试试这个

 AlertDialog alertDialog = builder.create();

 builder.setOnShowListener(new DialogInterface.OnShowListener() {

                @Override
                public void onShow(DialogInterface dialog) {
                     Button b = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
                     b.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            String strComments = youredittext.getText().toString().trim();   // get your Textbox value here
                            if(strComments==null || strComments.length()==0)
                            {
                                Toast.makeText(context, "Please Enter General Comments", 1).show();
                            }
                            else
                            {
                                alertDialog.dismiss();
                                // do stuff if success

                            }
                        }
                    });

                }
            });

我们正在做的是，只是覆盖AlertDialog Positive按钮，以避免关闭按钮而不在字段中输入值

修改

public Dialog createDialog(){ AlertDialog.Builder builder = new AlertDialog.Builder(SectionsActivity.this); View v = getLayoutInflater().inflate(R.layout.order_dialog, null); builder.setView(v); tableNum = (EditText)v.findViewById(R.id.numberEntry); coverNum = (EditText)v.findViewById(R.id.coversEntry); builder.setMessage("Order Information"); builder.setPositiveButton("Confirm", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int id) { if(tableNum.getText().length() != 0 && coverNum.length() != 0){ //Create order object in here table = Integer.parseInt(tableNum.getText().toString()); covers = Integer.parseInt(coverNum.getText().toString()); Order.getInstance().setTableNumber(table); Order.getInstance().setCoverNumber(covers); created = true; }else{ Toast.makeText(getApplicationContext(), "Must enter a table and cover number", Toast.LENGTH_SHORT).show(); } } }); AlertDialog alertDialog = builder.create(); builder.setOnShowListener(new DialogInterface.OnShowListener() { @Override public void onShow(DialogInterface dialog) { Button b = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE); b.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String strComments = youredittext.getText().toString().trim(); // get your Textbox value here if(strComments==null || strComments.length()==0) { Toast.makeText(context, "Please Enter General Comments", 1).show(); } else { alertDialog.dismiss(); // do stuff if success } } }); } }); return alertDialog ; }

Answer 2

String tableNum="",coverNum="";
if(tableNum.gettext.toString() == "" && coverNum.gettext.toString() =="")
{
    Toast.makeText(context, "Please Enter General Comments", 1).show();
}
else 
{
    dialoge.show();
}

当参数不正确时，警报对话框将被关闭

2 个答案: