Set error if the user tries to type after limit is reached in Android edittext

I tried via TextWatcher's afterTextChanged. All I want is display a toast message or set error on EditText if the user tries to insert characters after the limit is reached. I think it is possible. But don't know how to achieve this.

Update

My EditText coding is

<EditText
        android:id="@+id/editText1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:maxLength="10"
        android:layout_marginTop="150dp"
        android:inputType="numberDecimal" >

Here if the user tries to enter more than 10 digit I want to display a toast or want to set error.

Update

 editText1.setOnKeyListener(new OnKeyListener() {

        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (editText1.getText().length() >= 10)
                Toast.makeText(getApplicationContext(), "hi",
                        Toast.LENGTH_SHORT).show();
            return false;
        }
    });

Solution 1:

On key listener doesn't work on Soft Input Keyboard.. From the Android reference at:

http://developer.android.com/reference/android/view/View.OnKeyListener.html

View.OnKeyListener

Class Overview Interface definition for a callback to be invoked when a hardware key event is dispatched to this view. The callback will be invoked before the key event is given to the view. This is only useful for hardware keyboards; a software input method has no obligation to trigger this listener.

So that means that TextWatcher is only your friend with editboxes and keyboard Inputs..