EditText can only enter amount in Android development

Last time I wrote a blog that edittext can only enter the amount, later found a bug, when not yet entered a number in the case of the decimal point of the program to collapse, I went to check the payment treasure, see how, I entered the decimal point, the program is normal, I re-enter the number, can be normal input, but not perfect, because " .562 "How much is the money, I would like to add is that when the number has not been entered in the case of the decimal point, the digit automatically fill 0. Because the code is more redundant I went to the Internet to check the data, summed up a better way to achieve the edittext to add listening.

public class Money {
public static void Setpricepoint (final edittext edittext) {

Edittext.addtextchangedlistener (New Textwatcher () {
@Override
public void ontextchanged (charsequence s, int start, int before,
int count) {
if (S.tostring (). Contains (".")) {
if (S.length ()-1-s.tostring (). IndexOf (".") > 2) {
s = s.tostring (). subsequence (0,
S.tostring (). IndexOf (".") + 3);
Edittext.settext (s);
Edittext.setselection (S.length ());
}
}
if (s.tostring (). Trim (). substring (0). Equals (".")) {
s = "0" + s;
Edittext.settext (s);
Edittext.setselection (2);
}
if (s.tostring (). StartsWith ("0") && s.tostring (). Trim (). Length () > 1) {
if (!s.tostring (). substring (1, 2). Equals (".") {
Edittext.settext (s.subsequence (0, 1));
Edittext.setselection (1);
Return
}
}
}
@Override
public void beforetextchanged (charsequence s, int start, int count, int after) {

}
@Override
public void aftertextchanged (Editable s) {
TODO auto-generated Method Stub
}
});
}
}

It's easy to use.

Tv_price = (edittext) Findviewbyid (R.id.tv_price);
Money.setpricepoint (Tv_price);