我在 android 中有一个 EditText 供用户输入他们的年龄.它设置了一个 inputType=phone.我想知道是否有办法检查此 EditText 是否为空.
I have an EditText in android for users to input their AGE. It is set an inputType=phone. I would like to know if there is a way to check if this EditText is null.
我已经看过这个问题:检查EditText是否为空.但它没有解决 inputType=phone 的情况.
I've already looked at this question: Check if EditText is empty. but it does not address the case where inputType=phone.
这些,我已经检查过了,但不起作用:
These, I've checked already and do not work:
(EditText) findViewByID(R.id.age)).getText().toString() == null
(EditText) findViewByID(R.id.age)).getText().toString() == ""
(EditText) findViewByID(R.id.age)).getText().toString().matches("")
(EditText) findViewByID(R.id.age)).getText().toString().equals("")
(EditText) findViewByID(R.id.age)).getText().toString().equals(null)
(EditText) findViewByID(R.id.age)).getText().toString().trim().length() == 0
(EditText) findViewByID(R.id.age)).getText().toString().trim().equals("")
and isEmpty do not check for blank space.
感谢您的帮助.
可以使用 TextUtils 类进行检查
You can check using the TextUtils class like
TextUtils.isEmpty(ed_text);
或者你可以这样检查:
EditText ed = (EditText) findViewById(R.id.age);
String ed_text = ed.getText().toString().trim();
if(ed_text.isEmpty() || ed_text.length() == 0 || ed_text.equals("") || ed_text == null)
{
//EditText is empty
}
else
{
//EditText is not empty
}
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