Android Studio - MinSdkVersion on Java Library

Question

I have a module in my Android Studio project, which is a Java Library, in there I wrote a function like this:

 private boolean titleIsNotEmpty(Event event){
        return event.getTitle().trim().isEmpty();
 }

But on isEmpty() I get the following message:

Call requires API level 9 (current min is 1) Java.lang.String#isEmpty

Also when I try to use Function or Optional classes I get the same error:

Call requires API level 24 (current min is 1)

How can I define that on a Java Library?, my gradle build.module is:

apply plugin: 'java'

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
}

sourceCompatibility = "1.8"
targetCompatibility = "1.8"

Thanks in advance

simply the definitions of these functions and API's were added to respected versions so set your complied/target version to 24 in your case to use these functionalities — Pavneet_Singh, Oct 02 '16 at 06:59
@PavneetSingh So those compatibility options do not refer to the Java Binary? — J. Pichardo, Oct 02 '16 at 07:29
it's trade off , you want some feature you lose some backward support , many features don't have backward compatibility with v4,v7 — Pavneet_Singh, Oct 02 '16 at 08:19

score 0 · Answer 1 · answered Oct 03 '16 at 14:59

0

maybe you can try this add to your java module

@SuppressLint("NewApi")
    @TargetApi(Build.VERSION_CODES.KITKAT)

answered Oct 03 '16 at 14:59

score -1 · Answer 2 · edited Oct 02 '16 at 07:11

-1

Your current min SDK is 1...

You must look in your build.gradle after this line:

minSdkVersion **

You must cange the ** to your required SDK. For example 24

minSdkVersion 24

edited Oct 02 '16 at 07:11

ThisaruG

answered Oct 02 '16 at 07:08

1

Thanks @Tim but again, that option works within the android section of the `build.gradle` file of an android module, in a Java Module I cannot add that, I've already tried it. – J. Pichardo Oct 02 '16 at 07:10
Ok, I know what you mean. – Oct 02 '16 at 07:12

score -1 · Accepted Answer · answered Oct 03 '16 at 00:10

-1

I've seen this behavior if you're using android studio and you only have a JAR module in the project.

Just ignore it.

answered Oct 03 '16 at 00:10

spy

So I keep working as it is and when built it is going to work fine? – J. Pichardo Oct 03 '16 at 00:11
1

just ignore it, it's some kind of bug in studio – spy Oct 03 '16 at 00:26
instead of down voting, at least explain what the issue is. – spy Nov 10 '17 at 03:10

3 Answers3