Question

How should I compare two characters of two CharSequences?

These are my two CharSequences:

CharSequence name1 = fname.getText();
CharSequence name2 = sname.getText();

If I try to compare like this:

if(name1[i] == name2[j])

..it gives me errors.

Answer 1

String name1 = editText1.getText().toString();
String name2 = editText2.getText().toString();

To compare particular chars in your String, you can use char charAt(int) method also from String type. Here is example use:

if(name1.charAt(2) == name2.charAt(0)){
   // Do your stuff
}

You have to remember that char charAt(int) is zero-based so 0 is first, 1 is second and so on.
And in this example you can see that I compared two chars just like I would compare integers – with simple ==.

Comparing whole Strings:

// This returns true if Strings are equal:
name1.contentEquals(name2);    

// This returns 0 if Strings are equal:
name1.compareTo(name2);

To make it case insensitive you can use method from String type toLowerCase() on both Strings.

name1.equalsIgnoreCase(name2);

or:

name1.toLowerCase().contentEquals(name2.toLowerCase());