android edittext 限制输入框小数位数

先看下XML布局文件

<EditText
            android:id="@+id/et"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_toLeftOf="@+id/tv_count"
            android:background="@null"
            android:hint="@string/free_txt"
            android:inputType="numberDecimal"
            android:maxLength="10"
            android:singleLine="true"
            android:textColor="@color/txt_black1"
            android:textColorHint="@color/txt_gray2"
            android:textSize="@dimen/textsize16" />

android:inputType="numberDecimal"

/** 输入框小数的位数*/
	private static final int DECIMAL_DIGITS = 1;                

/**
	 *  设置小数位数控制   
	 */
    InputFilter lengthfilter = new InputFilter() {   
        public CharSequence filter(CharSequence source, int start, int end,   
                Spanned dest, int dstart, int dend) {   
            // 删除等特殊字符，直接返回   
            if ("".equals(source.toString())) {   
                return null;   
            }   
            String dValue = dest.toString();   
            String[] splitArray = dValue.split("\\.");   
            if (splitArray.length > 1) {   
                String dotValue = splitArray[1];   
                int diff = dotValue.length() + 1 - DECIMAL_DIGITS;   
                if (diff > 0) {   
                    return source.subSequence(start, end - diff);   
                }   
            }   
            return null;   
        }   
    };   

mEt.addTextChangedListener(mTextWatcher);
mEt.setFilters(new InputFilter[] { lengthfilter });