在做定制机时，对光敏值进行范围控制时，以及对区号输入时遇到对输入字数以及输入内容的显示。找了好多方法，终于找到了几种方法其中EditText的addTextChangedListener功不可没。例如对光敏值要在0到61之间。大于61时要在输入框中自动变为61.代码如下：
edt.addTextChangedListener(new TextWatcher() {
String nums = null;
@Override
public void afterTextChanged(Editable s) {
// TODO Auto-generated method stub
if (s != null && !s.equals("")) {
if (numSmall != -1 && numBig != -1) {//最大值和最小值自设
int a = 0;
try {
a = Integer.parseInt(s.toString());
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
a = 0;
}
if (a > 61)
edt.setText("61");
return;
} }
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
/*if (start == 4) {
nums = s.toString();
}*/
}
@Override
public void onTextChanged(CharSequence s, int start, int before,
int count) {
/*
* Toast.makeText(getBaseContext(), s + "****" + start + "***" +
* before, 3000).show();
*/
if (start > 1) {
if (numSmall != -1 && numBig != -1) {
int num = Integer.parseInt(s.toString());
if (num > 61) {
s = "61";
}
return;
} }
}
});
