Question

我如何使用隐藏的课程？

我可以通过反射使用隐藏类，隐藏方法或隐藏字段。但在我的情况下，我必须扩展一个隐藏的类并覆盖非私有方法。

我有一个解决方案 Android: Extending a hidden class that is obtained through reflection ，它使用一个虚拟类来动态替换它。

我尝试了，但不幸的是我得到了java.lang.IllegalAccessError 我创建了一个虚拟模块和一个虚拟类android.app.ContextImpl$ServiceFetcher，然后在主模块中创建了一个类来扩展它。

另外，我通过provide 'xxxx'编译了虚拟模块当我加载类时，将抛出错误。有人可以帮帮我吗？

以下是代码：

虚拟课

package android.app;

import android.content.Context;
import java.util.ArrayList;

class ContextImpl {

    // The system service cache for the system services that are
    // cached per-ContextImpl.  Package-scoped to avoid accessor
    // methods.
    final ArrayList<Object> mServiceCache = new ArrayList<Object>();
    private static int sNextPerContextServiceCacheIndex = 0;

    /*package*/ static class ServiceFetcher {
        int mContextCacheIndex = -1;

        /**
         * Main entrypoint; only override if you don't need caching.
         */
        public Object getService(ContextImpl ctx) {
            ArrayList<Object> cache = ctx.mServiceCache;
            Object service;
            synchronized (cache) {
                if (cache.size() == 0) {
                    // Initialize the cache vector on first access.
                    // At this point sNextPerContextServiceCacheIndex
                    // is the number of potential services that are
                    // cached per-Context.
                    for (int i = 0; i < sNextPerContextServiceCacheIndex; i++) {
                        cache.add(null);
                    }
                } else {
                    service = cache.get(mContextCacheIndex);
                    if (service != null) {
                        return service;
                    }
                }
                service = createService(ctx);
                cache.set(mContextCacheIndex, service);
                return service;
            }
        }

        /**
         * Override this to create a new per-Context instance of the
         * service.  getService() will handle locking and caching.
         */
        public Object createService(ContextImpl ctx) {
            throw new RuntimeException("Not implemented");
        }
    }

    public Context getOuterContext() {
        return null;
    }
}

自定义类

package android.app;

public class V14to23ServiceFetcher extends ContextImpl.ServiceFetcher {
    @Override
    public Object createService(ContextImpl ctx) {
        // do something here
        return null;
    }
}

例外代码

Class.forName("android.app.V14to23ServiceFetcher");

完整堆栈跟踪

05-19 14:55:16.813 29993-29993/? W/ResourcesManager: Asset path '/system/framework/android-support-v13.jar' does not exist or contains no resources.
05-19 14:55:16.813 29993-29993/? I/libthemeutils: Theme： libthemeutil.so load success
05-19 14:55:16.813 29968-29968/? I/art: Rejecting re-init on previously-failed class java.lang.Class<android.app.V14to23ServiceFetcher>
05-19 14:55:16.813 29968-29968/? I/art: Rejecting re-init on previously-failed class java.lang.Class<android.app.V14to23ServiceFetcher>
05-19 14:55:16.813 29968-29968/? D/AndroidRuntime: Shutting down VM
    Process: a.b.c.com.appres, PID: 29968
                                                       java.lang.IllegalAccessError: android.app.V14to23ServiceFetcher
                                                           at dalvik.system.DexFile.defineClassNative(Native Method)
                                                           at dalvik.system.DexFile.defineClass(DexFile.java:226)
                                                           at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
                                                           at dalvik.system.DexPathList.findClass(DexPathList.java:321)
                                                           at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
                                                           at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
                                                           at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
                                                           at com.a.b.c.d.install(ResourcesPatch.java:227)
                                                           at com.a.b.c.e.installRes(PatchManager.java:53)
                                                           at a.b.c.com.appres.App.onCreate(App.java:29)
                                                           at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1012)
                                                           at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4598)
                                                           at android.app.ActivityThread.access$1500(ActivityThread.java:154)
                                                           at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1380)
                                                           at android.os.Handler.dispatchMessage(Handler.java:102)
                                                           at android.os.Looper.loop(Looper.java:135)
                                                           at android.app.ActivityThread.main(ActivityThread.java:5308)
                                                           at java.lang.reflect.Method.invoke(Native Method)
                                                           at java.lang.reflect.Method.invoke(Method.java:372)
                                                           at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:913)
                                                           at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:708)

如何扩展隐藏的android类

0 个答案: