在 Android Studio 中设置警报对话框的文本长度

Question

如何设置最多可以输入多少个字符。所以现在用户可以在警报对话框中输入很多，而它应该有最大值。它不像 XML。那样会更容易，有关此警报对话框的任何提示吗？

    private void RequestNewGroup()
{
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this, R.style.AlertDialog);
    builder.setTitle("Enter Group Name ");

    final EditText groupNameField = new EditText(MainActivity.this);
    groupNameField.setHint("");
    builder.setView(groupNameField);

    builder.setPositiveButton("Create", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i)
        {
            String groupName = groupNameField.getText().toString();

            if (TextUtils.isEmpty(groupName))
            {
                Toast.makeText(MainActivity.this, "Please write Group Name...", Toast.LENGTH_SHORT).show();
            }
            else
            {
                CreateNewGroup(groupName);
            }
        }
    });

    builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i)
        {
            dialogInterface.cancel();
        }
    });

    builder.show();
}

Answer 1

您需要将 InputFilter 添加到您的 EditText

final EditText groupNameField = new EditText(MainActivity.this);
groupNameField.setHint("");

// ### -> max length
groupNameField.setFilters(new InputFilter[]{ new InputFilter.LengthFilter(###) });