使用EditText怎么限制小数点前后的位数

public class MyWatcher implements TextWatcher {  private int beforeDot;  private int afterDot;    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    }  }}