How can an error message be set for the Spinner in Android?

Spinner class will return a textview when you use getSelectedView(). So you can use setError() indirectly.

((TextView)spinner.getSelectedView()).setError("Error message");

Results should be like ...

Hope It will be helpful!

There are a few solutions in this thread Creating a setError() for the Spinner:

The EdmundYeung99's one works for me, either you are using your own adapter or not. Just put the following code in your validate function:

TextView errorText = (TextView)mySpinner.getSelectedView();
errorText.setError("");
errorText.setTextColor(Color.RED);//just to highlight that this is an error
errorText.setText("my actual error text");//changes the selected item text to this

But, make sure you have at least one value in the Spinner adapter when you are doing your verification. If not, like an empty adapter waiting to be populate, make your adapter get an empty String:

ArrayAdapter<String> adapter = new ArrayAdapter<>(context, android.R.layout.simple_spinner_item, new String[]{""});
mySpinner.setAdapter(adapter);

Here is a solution that uses a hidden TextView to get a pop-up message to appear, in addition to the error icon in the spinner. When in an error state, the Spinner looks like this:

When not in an error state, it looks like this.

The complete solution is documented here: https://stackoverflow.com/a/29956372/3063884