Thanks for your advice. I created an apk using the same classes and
installed it using adb install to Emulator. Now I tried to use the
following code to access the methods in Class SystemProperties which
is part of newly installed apk. I still got "ClassNotFoundException":
public void test0method(){
DexClassLoader dLoader = new DexClassLoader("/data/app/
com.my.internal.apk",
"/data/local/tmp", null,
ClassLoader.getSystemClassLoader());
try {
Class cLoad = dLoader.loadClass
("com.my.internal.SystemProperties");
// above line throw ClassNotFoundException
Method mLoad = cLoad.getMethod("GetString",new Class[]{});
Object obj = cLoad.newInstance();
Object sysProp = cLoad.newInstance();
mLoad.invoke(obj);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I peeked into the apk file and saw classes.dex there. Is there a way I
can dump the content of a dex file and to see if the classes are
there?
Thanks,
Sherry
On May 28, 12:43 pm, fadden <[email protected]> wrote:
> On May 26, 4:00 pm, sherry <[email protected]> wrote:
>
> > I'm trying to dynamically load a jar file, then load the classes
> > inside the jar. The code is simple but I keep getting ClassNotFind
> > exception. The class is in the jar. How can I figure out what is
> > wrong?
>
> Two thoughts come to mind:
>
> (1) The Dalvik VM uses its own DEX format, not Java .class files. If
> you have a Jar full of classfiles, it's not going to work. The VM
> expects to find a single "classes.dex" in a jar file.
> (2) For loading classes from DEX files outside your app's APK you
> probably want to use DexClassLoader (introduced in 1.5).
> URLClassLoader is not really useful for loading classes.
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