Question

So I’ve implemented a ViewPager in Java that, for brevity, looks like this:

public class ViewpagerActivity extends ViewPager {
private Context _context;
public ViewpagerActivity(Context context) {
    super(context);
    _context = context;
    ViewPager viewPager = (ViewPager) findViewById(R.id.viewPager);
    ARViewPagerAdapter adapter = new ARViewPagerAdapter(_context, LayoutInflater.from(_context));
    viewPager.setAdapter(adapter);
    addView(viewPager);
    // TODO Auto-generated constructor stub
}

In Monodroid I’m calling this (off the jar file) using the following:

        IntPtr _viewpagerview = Android.Runtime.JNIEnv.FindClass("net/salespad/viewpager/ViewpagerActivity");
        IntPtr _viewpagerconstructor = JNIEnv.GetMethodID(_viewpagerview, "<init>", "(Landroid/context/Context;)V");
        IntPtr _viewpager = JNIEnv.NewObject(_viewpagerview, _viewpagerconstructor);

My question is- what do I do with the final IntPtr? How do I cast that to a view?

Answer 1

You can instantiate a Java.Lang.Object from the IntPtr like this:

var javaObject = new Java.Lang.Object(_viewpager, JniHandleOwnership.TransferLocalRef);

There is also the JavaCast extension method that can help you cast that object to another class:

var viewPager = javaObject.JavaCast<ViewPager>();

However, the problem you’re going to run into here is that the ViewPager class isn’t accessible from C#, meaning that logic will need to stay in Java for now.