How to load a Java class dynamically on android/dalvik?

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There’s an example of DexClassLoader in the Dalvik test suite. It accesses the classloader reflectively, but if you’re building against the Android SDK you can just do this:

String jarFile = "path/to/jarfile.jar";
DexClassLoader classLoader = new DexClassLoader(
    jarFile, "/tmp", null, getClass().getClassLoader());
Class<?> myClass = classLoader.loadClass("MyClass");

For this to work, the jar file should contain an entry named classes.dex. You can create such a jar with the dx tool that ships with your SDK.

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