在我的应用程序中,我必须验证edittext.它应该只允许字符,数字,下划线和连字符.
这是我的代码：
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 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);
在这里,当我输入edittext,应用程序是强制关闭.请给我建议.谢谢提前.
解决方法
而不是使用您的“手动”检查方法,在Android中有一些非常容易的东西：
InputFilter filter = new InputFilter() {
public CharSequence filter(CharSequence source,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});
或者另一种方法：在xml中设置允许的字符,您正在创建yor EditTExt：
<EditText android:inputType="text" android:digits="0,1,2,3,4,5,6,7,8,9,*,qwertzuiopasdfghjklyxcvbnm,_,-" android:hint="Only letters,digits,_ and - allowed" />
