在程序中 edittext 验证，应该只允许输入字符、数字、下划线和连字符。
edittext.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// TODO Auto-generated method stub
}
@Override
public void afterTextChanged(Editable s) {
// validation codes here
location_name=s.toString();
Toast.makeText(getApplicationContext(),location_name, Toast.LENGTH_SHORT).show();
if (location_name.matches(".*[^a-z^0-9].*"))
{
location_name = location_name.replaceAll("[^a-z^0-9]", "");
s.append(location_name);
s.clear();
Toast.makeText(getApplicationContext(),"Only lowercase letters and numbers are allowed!",Toast.LENGTH_SHORT).show();
}
}
});
location.add(location_name);
当我在edittext中输入信息时，程序被强行关闭了。什么地方出错呢？
不要使用 "manual"方法，下面这个方法很简单：
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
for (int i = start; i < end; i++) {
if ( !Character.isLetterOrDigit(source.charAt(i)) || !Character.toString(source.charAt(i)) .equals("_") || !Character.toString(source.charAt(i)) .equals("-")) {
return "";
}
}
return null;
}
};
edit.setFilters(new InputFilter[]{filter});
或者另一个方法：在 xml 中设置创建 EditText 允许的字符
<EditText
android:inputType="text"
android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-"
android:hint="Only letters, digits, _ and - allowed"
/>
你放错地也改错值了，给你个参考的
final EditText et = (EditText) this.findViewById(R.id.myEdit);
et.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
String location_name=s.toString();
if (location_name.matches("^[A-Za-z0-9 _-]+$")){
Toast.makeText(getApplicationContext(),"类型正确!",Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getApplicationContext(),"类型不符!",Toast.LENGTH_SHORT).show();
et.setText("AAA");//change here
}
}......
android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-" 中间不需要逗号的 写成这样就可以了的 android:digits="0123456789*qwertzuiopasdfghjklyxcvbnm_-"