问题描述

我有一个执行一些验证的对话框(如下).你的问题是，显示 Toast 后对话框被关闭，而我没有调用关闭.我需要展示 toast 并保持对话框打开以更正错误.

I have a dialog which performs some validation (below). Thee problem is, the dialog is dismissed after the Toast is displayed, without me calling dismiss. I need to show the toast and keep the dialog open to correct the error.

final EditText txtName = new EditText(this);
AlertDialog.Builder dlgAdd = new AlertDialog.Builder(this)
    .setTitle(R.string.create_category)
    .setMessage(R.string.name)
    .setView(txtName)
    .setPositiveButton(R.string.ok, new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            String newCatName = txtName.getText().toString().trim(); // Converts the value of getText to a string.
            if (newCatName != null && newCatName .length() ==0)
            {  
                Toast.makeText(ManageCategories.this, R.string.err_name_required, 3500).show();

            } else {
                try {
                    boolean alreadyExists = mDatabaseAdapter.getCategoryIDs(newCatName).length > 0;// ids of cats with this name
                    if(alreadyExists) {
                        Toast.makeText(ManageCategories.this, R.string.categoryAlreadyExists, 3500).show();
                    } else {
                        mDatabaseAdapter.addCategory(newCatName);
                    }
                }catch(Exception ex){
                    Toast.makeText(ManageCategories.this, R.string.error+':'+ ex.getLocalizedMessage(), 3500).show();
            }
            }
        }
    }).setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
           public void onClick(DialogInterface dialog, int id) {
                dialog.cancel();
           }
});
dlgAdd.show();

推荐答案

我猜你并没有像这里的 Android 文档中提到的那样创建和显示对话框 http://developer.android.com/guide/topics/ui/dialogs.html 使用 OnCreateDialog 函数

My guess is that you are not creating and showing dialog as mentioned in the Android docs here http://developer.android.com/guide/topics/ui/dialogs.html using OnCreateDialog functions

请按照文档中的说明进行操作，如果仍然无法正常工作，请告知我们.

Please do as mentioned in the docs and let us know if it still does not work.

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