5
I got the following:
data = new Json().execute(URL).get();
System.out.println(data);
if (!data.isEmpty()) { //erro neste data.isEmpty
I have a mistake:
has an error: Call requires API level 9 (Current min is 8): java.lang.String#isEmpty
7
The easiest way to know if a string is empty is checking if its size is zero, which is what Java does in the method isEmpty() in standard Java, so you can also do this:
if (data.length() != 0)
7
Assuming Voce is on android:
There is a difference between "Empty" string ( empty string) and "Blank string" (I don’t know a good translation, but it would be a string composed of space characters). Thus "".isEmpty() == true, but " ".isEmpty() == false. Using trim() you can turn a Blank string into an Empty string by entering an error.
3
Whereas date is a String you can do so:
if(!"".equals(data))
You’d have to do at least one data.trim(). If data for " " (have a space) your checking will not work.
@In fact this answer is more certain than that of Felipe (in fact error of Ascorbin in the OS), at least in part of it, after all if it gives a trim() is because the string had a space and was not empty.
Another reason for this to be more advised is that it will never give nullpointer.
0
It may be so:
if (str.equals("") { //commands here }
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Android Apis below 9 have this limitation even, they do not implement the
isEmpty(), I’m not sure why.– Piovezan
@Piovezan had not even thought it could be Android. Still it’s crazy, because it exists since the 6.
– Maniero