Android EditText One second variable amount input box

Recently done a project needs to use the recharge and the amount of cash, then you need to achieve in the input box with the amount of decimal point number, while ensuring that the decimal point after two digits, so the Internet to check some information, to achieve such a function.

First, we need to add a word in the EditText attribute in the layout: android:inputtype= "Numberdecimal", which means that only floating-point data can be entered when entering.

Customize a class that writes functions here.

The code is as follows

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Import Android.text.InputFilter; Import android.text.Spanned; Import Java.util.regex.Matcher; Import Java.util.regex.Pattern; /** * Joy on 2015/12/17. * * Amount Input format */ public class Editinputfilter implements Inputfilter { /** * Maximum number, we take the int type maximum value */ public static final int max_value = 2147483647; /** * Number of digits after the decimal point */ public static final int pontint_length = 2; Pattern p; Public Editinputfilter () { p = Pattern.compile ("[0-9]*"); In addition to the number of other } /** * Source New Input string * Start new input string start subscript, typically 0 * End of the new input string endpoint subscript, typically source length-1 * dest input before text box content * DStart original content starting coordinates, generally 0 * DEnd Original content endpoint coordinates, generally dest length-1 */ @Override Public charsequence filter (charsequence src, int start, int end, spanned dest, int dstart, int dend) { String OldText = dest.tostring (); System.out.println (OldText); Verify deletion and other keys if ("". Equals (Src.tostring ())) { return null; } Verifying a non-digit or decimal point Matcher m = p.matcher (SRC); if (Oldtext.contains (".")) { If you already have a decimal point, you can only enter a number if (!m.matches ()) { return null; } }else{ If you do not enter a decimal point, you can enter a decimal point and number if (!m.matches () &&!src.equals (".")) { return null; } } Verify the size of the input amount if (!src.tostring (). Equals ("")) { Double Dold = double.parsedouble (oldtext+src.tostring ()); if (Dold > Max_value) { Return Dest.subsequence (DStart, dend); }else if (Dold = = Max_value) { if (src.tostring (). Equals (".")) { Return Dest.subsequence (DStart, dend); } } } Verify that the decimal position accuracy is correct if (Oldtext.contains (".")) { int index = Oldtext.indexof ("."); int len = Dend–index; Decimal digits can only be 2 digits if (Len > Pontint_length) { Charsequence NewText = dest.subsequence (DStart, dend); return newtext; } } Return Dest.subsequence (DStart, DEnd) +src.tostring (); } } How to use our custom class, simply define the EditText control Edit_takeout_money in the corresponding activity, and then: Inputfilter[] Filters = {new Editinputfilter ()}; Edit_takeout_money.setfilters (filters); It's OK.