启用另一个程序某些方法

DexFile df = new DexFile(new File("/data/app/my_downloaded_lib.apk")); 
ClassLoader cl = getClassLoader(); 
Class clazz = df.loadClass("com/my/lib/MyClass", cl); 

2.cl = new DexClassLoader("/full/path/com.example.apk", 
                        getFilesDir().getAbsolutePath(),// /data/data/foo/files 
                        null,  // native lib path, I haven't used this 
                        MyClass.class.getClassLoader()); 
// This doesn't make Class.forName() work, instead I do this: 
Class<?> foo = cl.loadClass("com.example.foo"); 
3.

PathClassLoader("/data/app/org.startsmall.myapp.apk",

                ClassLoader.getSystemClassLoader());

final String apkFiles =

            "/data/app/org.startsmall.myapp.apk:" + // myself

            // handlers defined by other developers

            "/data/app/" + handlerClassName.substring(0, lastDotPos) + ".apk";

  

        dalvik.system.PathClassLoader myClassLoader =

            new dalvik.system.PathClassLoader(

                apkFiles,

                ClassLoader.getSystemClassLoader());

  

         // ...

  

        try {

            Class<?> handler =

                Class.forName(handlerClassName, true, classLoader);

  

            // Call reflective APIs.

  

       } catch (ClassNotFoundException e) {

            // .....