Question

我正在尝试禁用警报对话框，如果TextView为空，我浏览了几个帖子，但不是它们是自定义警报对话框。怎么解决这个问题。提前致谢 以下是我的代码示例自定义提醒对话框代码

     protected void showInputDialog() {

    // get prompts.xml view
    LayoutInflater layoutInflater = LayoutInflater.from(Nav_Settings.this);
    View promptView = layoutInflater.inflate(R.layout.nav_settings_change_password, null);
    final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(Nav_Settings.this);
    alertDialogBuilder.setView(promptView);
    alertDialogBuilder.setIcon(R.drawable.icon_secret);

    alertDialogBuilder.setTitle("CHANGE PASSWORD");

    final EditText currentPassword = (EditText) promptView.findViewById(R.id.etCurrentPassword);
    final EditText newPassword = (EditText) promptView.findViewById(R.id.etNewPassword);
    final EditText confirmNewPassword = (EditText) promptView.findViewById(R.id.etConfirmNewPassword);

    // setup a dialog window
    alertDialogBuilder.setPositiveButton("Update Password", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {
            if (TextUtils.isEmpty(currentPassword.getText().toString().trim())) {
                currentPassword.setError("should not be empty");
            } else if (TextUtils.isEmpty(newPassword.getText().toString().trim())) {
                newPassword.setError("should not be empty");
            } else if (TextUtils.isEmpty(confirmNewPassword.getText().toString().trim())) {
                confirmNewPassword.setError("should not be empty");
            } else if (newPassword.getText().toString().trim() != confirmNewPassword.getText().toString().trim()) {
                confirmNewPassword.setError("new password not matching");
            } else if (currentPassword == newPassword) {
                newPassword.setError("new password should not be current password");
            } else {
                Toast.makeText(getApplicationContext(), currentPassword.getText().toString() + "\n" + newPassword.getText().toString() + "\n" + confirmNewPassword.getText().toString(), Toast.LENGTH_SHORT).show();

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

    // create an alert dialog
    AlertDialog alert = alertDialogBuilder.create();
    alert.show();
    alert.getButton(alert.BUTTON_NEGATIVE).setTextColor(getResources().getColor(R.color.colorPrimary));
    alert.getButton(alert.BUTTON_POSITIVE).setTextColor(getResources().getColor(R.color.colorPrimary));
    Typeface face = Typeface.createFromAsset(getAssets(),
            "fonts/RobotoCondensed-Bold.ttf");
    alert.getButton(alert.BUTTON_POSITIVE).setTypeface(face);
    alert.getButton(alert.BUTTON_NEGATIVE).setTypeface(face);
}

Answer 1

最初将其设为禁用：

Button button = alert.getButton(alert.BUTTON_NEGATIVE);
button.setEnabled(false);
alert.setCancelable(false);

在密码EditText上添加TextWhatcher：

currentPassword.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            if(TextUtils.isEmpty(currentPassword.getText().toString().trim())){
                button.setEnabled(false);
                alert.setCancelable(false);
            } else{
                button.setEnabled(true);
                alert.setCancelable(true);
            }
        }

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

基本上，每次用户更改EditText中的文本时，您都可以检查它是否为空＆amp;相应地启用/禁用“取消”按钮。

Answer 2

您可以在方法顶部放置一个布尔值，只有在清除所有验证后才能使其成为现实

protected void showInputDialog() {

// get prompts.xml view
LayoutInflater layoutInflater = LayoutInflater.from(Nav_Settings.this);
View promptView = layoutInflater.inflate(R.layout.nav_settings_change_password, null);
final boolean isCloseValid = false; // THIS BOOLEAN
final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(Nav_Settings.this);
alertDialogBuilder.setView(promptView);
alertDialogBuilder.setIcon(R.drawable.icon_secret);

alertDialogBuilder.setTitle("CHANGE PASSWORD");

final EditText currentPassword = (EditText) promptView.findViewById(R.id.etCurrentPassword);
final EditText newPassword = (EditText) promptView.findViewById(R.id.etNewPassword);
final EditText confirmNewPassword = (EditText) promptView.findViewById(R.id.etConfirmNewPassword);

// setup a dialog window
alertDialogBuilder.setPositiveButton("Update Password", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int id) {
        if (TextUtils.isEmpty(currentPassword.getText().toString().trim())) {
            currentPassword.setError("should not be empty");
isValidClose = false // VALIDATION FALSE
        } else if (TextUtils.isEmpty(newPassword.getText().toString().trim())) {
            newPassword.setError("should not be empty");
isValidClose = false // VALIDATION FALSE
        } else if (TextUtils.isEmpty(confirmNewPassword.getText().toString().trim())) {
            confirmNewPassword.setError("should not be empty");
isValidClose = false // VALIDATION FALSE
        } else if (newPassword.getText().toString().trim() != confirmNewPassword.getText().toString().trim()) {
            confirmNewPassword.setError("new password not matching");
isValidClose = false // VALIDATION FALSE
        } else if (currentPassword == newPassword) {
            newPassword.setError("new password should not be current password");
isValidClose = false // VALIDATION FALSE
        } else {
            Toast.makeText(getApplicationContext(), currentPassword.getText().toString() + "\n" + newPassword.getText().toString() + "\n" + confirmNewPassword.getText().toString(), Toast.LENGTH_SHORT).show();
isValidClose = true; // MAKE TRUE HERE 

        }
    }
}).setNegativeButton("Cancel",
        new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
             if(isValidClose){ // if validations is cleared
               dialog.cancel();
              }
            }
        });

// create an alert dialog
AlertDialog alert = alertDialogBuilder.create();
alert.show();
alert.getButton(alert.BUTTON_NEGATIVE).setTextColor(getResources().getColor(R.color.colorPrimary));
alert.getButton(alert.BUTTON_POSITIVE).setTextColor(getResources().getColor(R.color.colorPrimary));
Typeface face = Typeface.createFromAsset(getAssets(),
        "fonts/RobotoCondensed-Bold.ttf");
alert.getButton(alert.BUTTON_POSITIVE).setTypeface(face);
alert.getButton(alert.BUTTON_NEGATIVE).setTypeface(face);

}

如果Alert对话框中的editText为空，如何禁用警报对话框关闭

2 个答案: