Android: Adding external library to project not working

问题

I am trying to add Jsoup library to my project, but I am getting an error in the program saying "Cannot resolve symbol 'Jsoup'". Below is what I have done, but not working.

1)From the Jsoup website, I downloaded the core library jsoup-1.10.2.jar
2)Dragged and dropped the .jar file under libs folder in my project
3)Under build.gradle in dependencies, I added the following line

compile files('libs/jsoup-1.10.2.jar')

4)In MainActivity.java file, I tried to add the following line

String url = "http://example.com";
try {
    Document document = Jsoup.connect(url).get();
    //more code here
}

Then, Jsoup turns red and says "Cannot resolve symbol 'Jsoup'". Can anyone tell me what I am doing wrong? I visited many websites and watched a few tutorial videos and I followed them. But I am getting this error.

回答1:

In the file build.gradle you should have the following:

dependencies {
    ...
    compile 'org.jsoup:jsoup:1.10.2'
    ...
}

You can see the instructions here, in Gradle section.

来源：https://stackoverflow.com/questions/42146916/android-adding-external-library-to-project-not-working