Android：在 Number/Phone 上设置 inputType 时检查 EditText 是否为空

Android: Check if EditText is Empty when inputType is set on Number/Phone

提问by user3061111

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.

我在 android 中有一个 EditText 供用户输入他们的年龄。它被设置为 inputType=phone。我想知道是否有办法检查此 EditText 是否为 null。

I've already looked at this question: Check if EditText is empty.but it does not address the case where inputType=phone.

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。

These, I've checked already and do not work:

这些，我已经检查过并且不起作用：

(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.

Thank you for your help.

感谢您的帮助。

回答by Hariharan

You can check using the TextUtils class like

您可以使用 TextUtils 类进行检查，例如

TextUtils.isEmpty(ed_text);

or you can check like this:

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
}

回答by Jawad Zeb

First Method

第一种方法

Use TextUtil library

使用TextUtil 库

if(TextUtils.isEmpty(editText.getText().toString()) 
{
    Toast.makeText(this, "plz enter your name ", Toast.LENGTH_SHORT).show();
    return;
}

Second Method

第二种方法

private boolean isEmpty(EditText etText) 
{
        return etText.getText().toString().trim().length() == 0;
}

回答by J.Done

I use this method for same works:

我将这种方法用于相同的作品：

public boolean checkIsNull(EditText... editTexts){
for (EditText editText: editTexts){
  if(editText.getText().length() == 0){
    return true;
  }
}
return false;
}

回答by AZIM MOHAMAD

Simply do the following

只需执行以下操作

String s = (EditText) findViewByID(R.id.age)).getText().toString();
TextUtils.isEmpty(s);

回答by Samer Kasseb

EditText textAge;
textAge = (EditText)findViewByID(R.id.age);
if (TextUtils.isEmpty(textAge))
{
Toast.makeText(this, "Age Edit text is Empty", Toast.LENGTH_SHORT).show();
//or type here the code you want
}

回答by Sunil

I found that these tests fail if a user enters a space so I test for a missing hint for empty value

我发现如果用户输入空格，这些测试就会失败，所以我测试是否缺少空值提示

EditText username = (EditText) findViewById(R.id.editTextUserName);

EditText password = (EditText) findViewById(R.id.editTextPassword);

// these hint strings reflect the hints attached to the resources

if (username.getHint().equals("Enter your username") || password.getHint().equals("Enter Your Password")){
      // enter your code here 

} else {
      // alls well
}

回答by Bobby Sebastian

editText.length() usually works for me try this one

editText.length() 通常对我有用 试试这个

if((EditText) findViewByID(R.id.age)).length()==0){
   //do whatever when the field is null`
}

回答by Gibolt

Add Kotlin getter functions

添加 Kotlin getter 函数

val EditText.empty get() = text.isEmpty() // it == ""
// and/or
val EditText.blank get() = text.isBlank() // it.trim() == ""

With these, you can just use if (edittext.empty) ...or if (edittext.blank) ...

有了这些，您可以使用if (edittext.empty) ...或if (edittext.blank) ...

If you don't want to extend this functionality, the original Kotlin is:

如果你不想扩展这个功能，原来的 Kotlin 是：

edittext.text.isBlank()
// or
edittext.text.isEmpty()

回答by Kafi Junior

Try this. This is the only solution I got

尝试这个。这是我得到的唯一解决方案

String phone;   

 try{
phone=(EditText) findViewByID(R.id.age)).getText().toString();

}
catch(NumberFormatException e){

 Toast.makeText(MainActivity.this, "plz enterphone Number ", Toast.LENGTH_SHORT).show();
    return;

}