Android: How to dynamically load classes from a JAR file?
I'm trying to dynamically load a class at runtime on the Android platform. The class is contained within a separate library JAR file, but packaged with the APK (as per the new library mechanism in the SDK). When using Class.forname method, I received a class not found exception. I've seen some discussion around the DexClassLoader method, but I can't find a good example of how it's used (and whether it's the best way to go about it - it seems a lot more complicated than the forname approach!).
I would be very grateful if someone could provide an example snippet of code of how to go about this.
Many thanks for your help.
Here's an example to dynamically load the DevicePolicyManager class.
Class myClass =
ClassLoader.getSystemClassLoader().loadClass("android.app.admin.DevicePolicyManager")
Object DPMInstance = myClass.newInstance();
Method myMethod = myClass.getMethod("setPasswordQuality",
new Class[] { ComponentName.class,
int.class });
myMethod.invoke(DPMInstance,
new Object[] { myComponentName,
PASSWORD_QUALITY_NUMERIC });
This is useful so you can choose to only load a class when the device is running a high enough SDK version.
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