Question

I have an XML layout file in my main project, which contains this:

<com.quietlycoding.android.picker.NumberPicker
            android:id="@+id/belegposition_belegpositionpickerpause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

This package resides in another project which I have added to my build path. The package name is 100% correct. I also tested this with an import in a .java file which the compiler does recognize.

But when the XML file is inflated at runtime I get this error:

02-03 01:56:58.824: E/dalvikvm(4213): Could not find class 'com.quietlycoding.android.picker.NumberPicker', referenced from method de.innosoft.android.activity.BelegPositionen$ArrayAdapterBelegPosition.getView
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213): Didn't find class "com.quietlycoding.android.picker.NumberPicker" on path: /system/framework/android.test.runner.jar:/data/app/de.innosoft.android-1.apk
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213): java.lang.ClassNotFoundException: Didn't find class "com.quietlycoding.android.picker.NumberPicker" on path: /system/framework/android.test.runner.jar:/data/app/de.innosoft.android-1.apk
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.LayoutInflater.createView(LayoutInflater.java:552)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:687)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.LayoutInflater.rInflate(LayoutInflater.java:746)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.LayoutInflater.rInflate(LayoutInflater.java:749)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.LayoutInflater.inflate(LayoutInflater.java:489)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at de.innosoft.android.activity.BelegPositionen$ArrayAdapterBelegPosition.getView(BelegPositionen.java:107)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.AbsListView.obtainView(AbsListView.java:2159)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.ListView.measureHeightOfChildren(ListView.java:1246)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.ListView.onMeasure(ListView.java:1158)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.View.measure(View.java:15513)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.View.measure(View.java:15513)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.View.measure(View.java:15513)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.LinearLayout.measureVertical(LinearLayout.java:847)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.View.measure(View.java:15513)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4827)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2176)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.View.measure(View.java:15513)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1874)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.Choreographer.doCallbacks(Choreographer.java:562)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.Choreographer.doFrame(Choreographer.java:532)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.os.Handler.handleCallback(Handler.java:725)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.os.Handler.dispatchMessage(Handler.java:92)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.os.Looper.loop(Looper.java:137)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at android.app.ActivityThread.main(ActivityThread.java:5191)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at java.lang.reflect.Method.invokeNative(Native Method)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at java.lang.reflect.Method.invoke(Method.java:511)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
02-03 01:57:02.191: E/java.lang.ClassNotFoundException(4213):   at dalvik.system.NativeStart.main(Native Method)

Is it not possible to reference an external project package from an XML file? Or have I just forgotten to a specific attribute to the root XML element?

EDIT: i am using an external project because I do not want to pollute my main project folders with all this external stuff (drawables etc). Unfortunately the library does not come as a JAR.

Answer 1

Try to add the external project as library.
In the external project go to project properties and in section Android check the Is Library checkbox. Then go your project properties an in the section Android add the external project as Library.