NoClassDefFoundError with Mapsforge 0.4.0 and Eclipse

Question

I am trying to add a map view to my application using Mapsforge. I have done the following:

• Downloaded jar files and placed them in the libs/ fold

Answer 1

@Ninja pointed me in the right direction but I'll post the detailed steps here.

Short answer: You need version 19 or higher of the Android toolchain, as that version introduced the Java 7 support needed to build against the prebuilt Mapsforge 0.4.0 libraries.

How to update:

• Start ADT. Update all installed packages and additionally select at least one version of Android SDK Build-tools that is 19 or higher. (You can have multiple versions of the Android SDK Build-tools installed alongside each other.)
• Now open Eclipse and select Help > Check for Updates from the menu.
  • If you get an error message that no software sources are available, go to Help > Install new software. In the dialog, click Add and add a new repository named ADT Plugin, URL https://dl-ssl.google.com/android/eclipse/. Then retry.
• Restart Eclipse when prompted to do so.
• Setting the compiler compliance level turned out not to be necessary in my case (I left it at 1.6).

With these steps my Mapsforge project works – I can display a map and the NoClassDefFoundError is gone.

Answer 2

NoClassDefFound is really a hard Exception to solve,a workaround you can try.

workaroud: Java Build Path -> Oeder and Export -> make sur 3rd.jar above yourPath/src

I know android support java7, only when you use the version above 19.