android:inputType="numberDecimal"或者setInputType(InputType.TYPE_NUMBER_FLAG_DECIMAL)

package com.xylpay.utils; import android.text.InputFilter; import android.text.Spanned; import android.text.TextUtils; import java.util.regex.Matcher; import java.util.regex.Pattern; /**  * Created by Jackie on 2016/1/30.  * 過濾用戶輸入只能為金額格式  */ public class CashierInputFilter implements InputFilter {   Pattern mPattern;   //輸入的最大金額   private static final int MAX_VALUE = Integer.MAX_VALUE;   //小數(shù)點后的位數(shù)   private static final int POINTER_LENGTH = 2;   private static final String POINTER = ".";   private static final String ZERO = "0";   public CashierInputFilter() {     mPattern = Pattern.compile("([0-9]|//.)*");   }   /**    * @param source  新輸入的字符串    * @param start   新輸入的字符串起始下標，一般為0    * @param end    新輸入的字符串終點下標，一般為source長度-1    * @param dest   輸入之前文本框內(nèi)容    * @param dstart  原內(nèi)容起始坐標，一般為0    * @param dend   原內(nèi)容終點坐標，一般為dest長度-1    * @return     輸入內(nèi)容    */   @Override   public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {     String sourceText = source.toString();     String destText = dest.toString();     //驗證刪除等按鍵     if (TextUtils.isEmpty(sourceText)) {       return "";     }     Matcher matcher = mPattern.matcher(source);     //已經(jīng)輸入小數(shù)點的情況下，只能輸入數(shù)字     if(destText.contains(POINTER)) {       if (!matcher.matches()) {         return "";       } else {         if (POINTER.equals(source)) { //只能輸入一個小數(shù)點           return "";         }       }       //驗證小數(shù)點精度，保證小數(shù)點后只能輸入兩位       int index = destText.indexOf(POINTER);       int length = dend - index;       if (length > POINTER_LENGTH) {         return dest.subSequence(dstart, dend);       }     } else {       //沒有輸入小數(shù)點的情況下，只能輸入小數(shù)點和數(shù)字，但首位不能輸入小數(shù)點和0       if (!matcher.matches()) {         return "";       } else {         if ((POINTER.equals(source) || ZERO.equals(source)) && TextUtils.isEmpty(destText)) {           return "";         }       }     }     //驗證輸入金額的大小     double sumText = Double.parseDouble(destText + sourceText);     if (sumText > MAX_VALUE) {       return dest.subSequence(dstart, dend);     }     return dest.subSequence(dstart, dend) + sourceText;   } }