Develop Reference

Call to specific class from JAR file

I want to call a Class A from JAR-1. But I have same Class in JAR-2 hence my app is calling Class A from JAR-2.
All the packages are same in both the JARs. For Eg,
com.package.classes.A in JAR-1 and com.package.classes.A in JAR-2
I want my app to call A from JAR-1.
I am using IntelliJ.(If this information helps)

How to prefer package-local class over library class's inner class?

Given this code:
package my.pkg;
import com.google.common.util.concurrent.Service;
class Test implements Service {
public static void main(String... a) {
System.out.println(Listener.class);
}
// method implementations omitted for brevity
}
And given there's one Listener class in my.pkg, and one as an inner class in the Service class I'm importing.
I would expect the package local class to 'win' here, since I'm not referring to Service.Listener.class or explicitly importing the inner class. Apparently, IntelliJ expects the same thing, since if I explicitly add import my.pkg.Listener;, it is automatically removed as being redundant. However, when compiling and running this code (Gradle 2.14.1 and openjdk 1.8.0_91, if that matters), it's very clear the inner class is winning.
How do I get this code to use the class in my.pkg? Explicitly adding the import doesn't work, since my IDE removes it. I'd also prefer not to use full class names (my.pkg.Listener) everywhere in the class.

How to change external class?

I am trying to change the SwipeRefreshLayout class from the external appCompat library in my android project. However, when I change values or add a new method to this class I can't see those changes in my project.
I already refreshed and rebuild the project.
Does anyone know how I am able to see the changes I made?

You shouldn't edit support libraries directly in my opinion.
Just create your own class..?
import android.support.v4.widget.SwipeRefreshLayout;
public class MySwipeLayout extends SwipeRefreshLayout {
... // custom methods
#Override
... // SwipeRefreshLayout method to override
}

Why public classes are in the same file in android developers swipe view example?

I know that public classes have to be in a separate file. Otherwise, they can 't be public. I try to understand and implement swipe view with titles/tabs in an android app, so I downloaded this example, which is from The Android Open Source Project. The example works and runs like a charm, but I can 't understand why, and I also can 't understand why eclipse doesn 't show me any errors for this.
If the above method is allowed in some special cases, which are these cases?

The documentation gives the impression that all classes are top level, but they are not. Check the source code on the zip file and you will see DemoCollectionPagerAdapter and DemoObjectFragment are nested inside CollectionDemoActivity.
This is the layout of the classes.
public class CollectionDemoActivity extends FragmentActivity {
...
public static class DemoCollectionPagerAdapter extends FragmentStatePagerAdapter {
...
}
public static class DemoObjectFragment extends Fragment {
...
}
}

NoClassDefFoundError when trying to copy support app

I'm trying to set up a tabbed interface for my application. I opened up the Support13Demos project distributed with the ADT. I am able to compile and run it. In order to work from it, I created a new project with a com.example.android.supportv13.app package and copied the appropriate files into it.
Then I copied over the referenced layouts and strings. All of my compilation errors are gone, but the application starts and immediately crashes with the error: Could not find class 'com.example.android.supportv13.app.ActionBarTabsPager$TabsAdapter', referenced from method com.example.android.supportv13.app.ActionBarTabsPager.onCreate.
The class ActionBarTabsPager does include a class TabsAdapter.
public class ActionBarTabsPager extends Activity {
…
public static class TabsAdapter extends FragmentPagerAdapter
implements ActionBar.TabListener, ViewPager.OnPageChangeListener { … }
}
I have tried cleaning the project and it didn't help. Private Libraries are also enabled.

i cant speak english well ,hope i can help u.
first right-click on your project--BuildPath--ConfigureBuildPath.
and then choose Order And ExPort
maybe some jar you need but you have not choose.
here's two picture(before modified and after modified)
before:http://img.my.csdn.net/uploads/201212/04/1354602396_3168.jpg;
after:http://img.my.csdn.net/uploads/201212/04/1354602436_2486.jpg

I added the android-support-v13.jar to the exports and removed Android Private Libraries.