The latter is more explicit and will allow you to call the outer class method if one exists in the inner class with the same name.
class OuterClass {
void foo() { System.out.println("Outer foo"); }
View.OnClickListener mListener1 = new View.OnClickListener() {
void foo() { System.out.println("Inner foo"); }
@Override public void onClick(View view) {
foo(); //Calls inner foo
OuterClass.this.foo(); //Calls outer foo
}
}
View.OnClickListener mListener2 = new View.OnClickListener() {
@Override public void onClick(View view) {
foo(); //Calls outer foo
OuterClass.this.foo(); //Calls outer foo
}
}
}