Android AlertDialog构造函数未定义

Question

我正在尝试显示一个警告对话框,如果单击检查帐户时缺少帐户信息.我在Eclipse中new AlertDialog.Builder(this)说错了the constructor AlertDialog.Builder(new View OnClickListener(){}) is undefined.如果我将它添加到活动的onCreate,代码工作正常.

checkButton.setOnClickListener(new OnClickListener() {
        public void onClick(View Arg0){
            String AccNum = null, Store = null;
            final SharedPreferences settings = getSharedPreferences(CHECK_PREFERENCES, MODE_PRIVATE);

            if (settings.contains("Account") == true){
                AccNum = (settings.getString("Account", "default"));
                Store = (settings.getString("Store", "default"));
            }
            if (AccNum.length() < 7) { 
                AlertDialog alert = new AlertDialog.Builder(this).create();
                alert.setTitle("Account Information missing!");
                alert.setMessage("Enter now? ");

                alert.setButton("Yes", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            startActivity(new Intent(CheckOrder.this, GoToSetup.class));
                        }
                });
                alert.setButton2("No", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            return;
                        }
                });
                alert.show();   

            }
        }
});

Answer 1

发生错误的原因this是OnClickListener您正在创建(在调用中checkButton.setOnClickListener(new OnClickListener(){),而不是父Activity.如果你的Activity类是ParentActivity,试试这个:

AlertDialog alert = new AlertDialog.Builder(ParentActivity.this).create();