EditText限制小数点前后位数

public class MyWatcher implements TextWatcher {
private int beforeDot;
private int afterDot;
/**
* 构造器
*
* @param beforeDot 小数点前位数   不限制输入-1
* @param afterDot  小数点后位数   不限制输入-1
*/
public MyWatcher(int beforeDot, int afterDot) {
this.beforeDot = beforeDot;
this.afterDot = afterDot;
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {

}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {

}

@Override
public void afterTextChanged(Editable s) {
judge(s);
}

private void judge(Editable editable) {
String temp = editable.toString();
int posDot = temp.indexOf(".");
//直接输入小数点的情况
if (posDot == 0) {
editable.insert(0, "0");
return;
}
//连续输入0
if (temp.equals("00")) {
editable.delete(1, 2);
return;
}
//输入"08" 等类似情况
if (temp.startsWith("0") && temp.length() > 1 && (posDot == -1 || posDot > 1)) {
editable.delete(0, 1);
return;
}

//不包含小数点 不限制小数点前位数
if (posDot < 0 && beforeDot == -1) {
//do nothing 仅仅为了理解逻辑而已
return;
} else if (posDot < 0 && beforeDot != -1) {
//不包含小数点 限制小数点前位数
if (temp.length() <= beforeDot) {
//do nothing 仅仅为了理解逻辑而已
} else {
editable.delete(beforeDot, beforeDot + 1);
}
return;
}

//如果包含小数点 限制小数点后位数
if (temp.length() - posDot - 1 > afterDot && afterDot != -1) {
editable.delete(posDot + afterDot + 1, posDot + afterDot + 2);//删除小数点后多余位数
}
}
}

<EditText
android:id="@+id/et_i_want"
android:layout_width="wrap_content"
android:layout_height="25dp"
android:hint="0.00"
android:inputType="numberDecimal"/>

etIWant.addTextChangedListener(new MyWatcher(-1, 2));//限制小数点后最多2位