我想使用 cglib 挂钩 context.startActivity，但出现异常

Question

private void cghookMInstrumentation() throws Exception {

    //get mInstrumentation
    Class<?> activityThreadClass = Class.forName("android.app.ActivityThread");
    Method currentActivityThread = activityThreadClass.getDeclaredMethod("currentActivityThread");
    currentActivityThread.setAccessible(true);
    Object sCurrentActivityThread = currentActivityThread.invoke(null);//ActivityThread instance

    Method getInstrumentation = activityThreadClass.getDeclaredMethod("getInstrumentation");
    getInstrumentation.setAccessible(true);
    Instrumentation instrumentation = (Instrumentation) getInstrumentation.invoke(sCurrentActivityThread);//Instrumentation

    Field mInstrumentationField = activityThreadClass.getDeclaredField("mInstrumentation");
    mInstrumentationField.setAccessible(true);

    Enhancer enHancer = new Enhancer();
    CglibProxy cglibProxy = new CglibProxy();
    enHancer.setSuperclass(instrumentation.getClass());
    enHancer.setCallback(cglibProxy);

    Instrumentation mInstrumentation = (Instrumentation) enHancer.create();

    //replace Instrumentation
    mInstrumentationField.set(instrumentation, mInstrumentation);
}

例外情况：

Caused by: java.lang.UnsupportedOperationException: can't load this type of class file
 at java.lang.ClassLoader.defineClass(ClassLoader.java:300)
 at java.lang.reflect.Method.invoke(Native Method) 
 at net.sf.cglib.core.ReflectUtils.defineClass(ReflectUtils.java:384) 
 at net.sf.cglib.core.AbstractClassGenerator.create(AbstractClassGenerator.java:219) 
 at net.sf.cglib.core.KeyFactory$Generator.create(KeyFactory.java:145) 
 at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:117) 
 at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:108) 
 at net.sf.cglib.core.KeyFactory.create(KeyFactory.java:104) 
 at net.sf.cglib.proxy.Enhancer.<clinit>(Enhancer.java:69) 
 at cn.chx.hooklib.CgLibHookClickListener.cghookMInstrumentation(CgLibHookClickListener.java:52) 
 at cn.chx.hooklib.CgLibHookClickListener.onClick(CgLibHookClickListener.java:28) 
 at android.view.View.performClick(View.java:5198) 
 at android.view.View$PerformClick.run(View.java:21147) 
 at android.os.Handler.handleCallback(Handler.java:739) 
 at android.os.Handler.dispatchMessage(Handler.java:95) 
 at android.os.Looper.loop(Looper.java:148) 
 at android.app.ActivityThread.main(ActivityThread.java:5417) 
 at java.lang.reflect.Method.invoke(Native Method) 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我要上钩context.startActivity

ActivityThread -> currentActivityThread() -> mInstrumentation

我写了一个 class extends Instrumentation 并设置成 mInstrumentationField，它工作正常，但我使用 cglib 我得到了这个异常；

如有任何帮助，我将不胜感激。

Answer 1

Cglib 不适用于 Android。你想做的事是不可能的。您可以尝试 Byte Buddy 作为替代方案，其中包括 Android 的 class 加载策略，这使得在 Android 上创建代理成为可能。

我想使用 cglib 挂钩 context.startActivity，但出现异常

I want to hook context.startActivity by using cglib, but got an exception

java

android

cglib