使用自定义对话框匹配密码

Question

我想使用自定义对话框进行引脚验证.这是我的代码:

public void fetchUI()
{
    add=(Button)findViewById(R.id.pinButton);

    add.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub

            final AlertDialog.Builder alert = new AlertDialog.Builder(MainActivity.this);
            final EditText input = new EditText(MainActivity.this);
            input.setTransformationMethod(PasswordTransformationMethod.getInstance());
            alert.setView(input);
            alert.setTitle("Type Your PIN");
            alert.setIcon(R.drawable.ic_launcher);
            alert.setMessage("Please Type Your PIN  below to Authenticate");

            alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {

                }
            });

            alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    dialog.cancel();
                }
            });

           alert.show();
        }
    });
}

现在我想这样做:如果我用正确的PIN点击OK,那么对话框就会消失.否则,如果我点击OK,它就不会消失.我怎样才能做到这一点？任何帮助将不胜感激.

Answer 1

    final String CORRECT_PIN = "123123"; // Should come from somewhere else than a local variable
    alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int whichButton) {
            if (CORRECT_PIN.equals(input.getText().toString()) {
                dialog.dismiss();
            } else {
                input.setError(getString(R.string.error_incorrect_pin));
            }    
        }
    });

编辑:上面的代码提供了处理验证的正确方法.但是,为了防止在单击按钮后取消对话框,您需要在自定义对话框按钮中包含自己的按钮.

其他可能性:仅在引脚正确时启用"确定"按钮.您需要在EditText和onTextChange方法中添加文本更改侦听器,请执行以下操作:

input.addTextChangedListener(new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {               
        alert.getButton(AlertDialog.BUTTON_POSITIVE).setEnabled(CORRECT_PIN.equals(input.getText().toString());
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void afterTextChanged(Editable s) {
    }
});