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) {  
  
 
   
  
 
                // .....