How can I tell if the data in EditText is empty in Android?

?? Today, I wrote a simple memory note applet, but found that when the added data cannot be empty, your code always does not work.

String titlestr = AddTitle. GetText(). toString();String contentstr = addcontent. GetText(). toString();if (titlestr = = NULL && CONTENTSTR = = null) {Toast. Maketext(This,"Cannot add an empty data", Toast. LENGTH_short). Show();} else if (titlestr = = null) {Toast. Maketext(This,"Please add title", Toast. LENGTH_short). Show();} else {Datautils. AddFile(Titlestr, CONTENTSTR, this);Toast. Maketext(This,"Add Success", Toast. LENGTH_short). Show();}

No Way ~

After improvement:

if (Titlestr = =""&& Contentstr = ="") {Toast. Maketext(This,"Cannot add an empty data", Toast. LENGTH_short). Show();} else if (titlestr = ="") {Toast. Maketext(This,"Please add title", Toast. LENGTH_short). Show();} else {Datautils. AddFile(Titlestr, CONTENTSTR, this);Toast. Maketext(This,"Add Success", Toast. LENGTH_short). Show();}

Still not.

On the Internet to collect some information, originally not only I encountered this problem AH ~ ~ ~ ~ ~ Solution Paste as follows:

Use of the Textutils.isempty () and Equals () methods in Android

?? For a UI interface, we often use the Textutils.isempty () method to determine whether a user is entering a user name or password, but sometimes it is possible to determine whether the edittext is empty, but sometimes it is very tangled, Do not know which of the two methods is better? Why? Please who knows the warrior detailed help answer, rookie ingredient thanks!

?? Carefully read the official Api:returns True if the string is null or 0-length. The meaning is to see if the parameter is empty or 0 length. Because you are returning a variable from EditText. If the variable itself is a null value, then the Equals method you drop it is going to give an error. But if you call Textutils.isempty (), pass the variable as a parameter. As long as this parameter is empty or "", it will return true. So, with the official give more rigorous. And. is also very convenient. Because you are alone to judge you are not going to write an if statement to judge. Returns a Boolean value, why does someone else pave the way?

Is there a difference between textutils.isempty (str) and Str.isempty ()? Which is better? Please write the reason

?? In the case of a return result, one difference is that when STR is empty (null) or an empty string (""), Textutils.isempty (str) returns TRUE, otherwise false is returned. Str.isempty () null pointer exception when empty (null).

?? In terms of efficiency, str.isempty () faster than Textutils.isempty (), because if you look at the official source code can be found Textutils.isempty () judged two steps, first judge = = NULL, and then judge. Length = = 0. And the former only judge. Length = = 0.

?? From a structural perspective, textutils.isempty (str) is a static method, and Str.isempty () is a method owned by an object of the String class.

Thanksgiving:
Common methods of Textutils class IsEmpty and equals
Http://www.eoeandroid.com/thread-323960-1-1.html

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How can I tell if the data in EditText is empty in Android?