Android setError() 保持空白

Question

我有这几行代码来验证表单输入。然而，它不输出任何东西——只是一个空白框。请问我错过了什么？

 public void onClick(View view)
 {
    if( view.getId() == R.id.btnLogin )
    {
        TestClass.setUsername( txtUserName.getEditableText().toString() );
        TestClass.setPassword( txtPassword.getEditableText().toString() );

        if( TestClass.getUsername().toString().length() == 0 )
        {
            this.txtUserName.setError( "Incorrect input!" );
        }
        else if( TestClass.getPassword().toString().length() == 0 )
        {
         this.txtPassword.setError( "Incorrect input!" );
        }
        else
        {
               // do the login stuff here
        }
     } 
  }

Answer 1

试试这个，

int ecolor = Color.RED; // whatever color you want
String estring = "Input is incorrect";  // your error message
ForegroundColorSpan fgcspan = new ForegroundColorSpan(ecolor);
SpannableStringBuilder ssbuilder = new SpannableStringBuilder(estring);
ssbuilder.setSpan(fgcspan, 0, estring.length(), 0);
myedittext.setError(ssbuilder);

来源:Android EditText.setError() yields invisible error text