BootClassLoader BOOTCLASSPATH(init.environ.rc)

本文深入解析了Android系统中关键的框架组件,包括core.jar、conscrypt.jar等,旨在为开发者提供全面的理解。

/system/framework/core.jar:
/system/framework/conscrypt.jar:
/system/framework/okhttp.jar:
/system/framework/core-junit.jar:
/system/framework/bouncycastle.jar:
/system/framework/ext.jar:
/system/framework/framework.jar:
/system/framework/framework2.jar:
/system/framework/telephony-common.jar:
/system/framework/voip-common.jar:
/system/framework/mms-common.jar:
/system/framework/android.policy.jar:
/system/framework/services.jar:
/system/framework/apache-xml.jar:
/system/framework/webviewchromium.jar

--------- beginning of main --------- beginning of system 2025-06-12 22:46:09.322 24133-24133 tware.hiltlearn com.software.hiltlearn E BBinder_init Processname <pre-initialized> 2025-06-12 22:46:09.322 24133-24133 tware.hiltlearn com.software.hiltlearn E BBinder_init hasGetProcessName <pre-initialized> 2025-06-12 22:46:09.604 24133-24133 UltraFrame...entFactory com.software.hiltlearn E Failed to create UltraFrameworkComponentFactoryImpl java.lang.ClassNotFoundException: android.os.ufw.UltraFrameworkComponentFactoryImpl at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:607) at java.lang.Class.forName(Class.java:512) at android.os.ufw.UltraFrameworkComponentFactory.getInstance(UltraFrameworkComponentFactory.java:78) at android.view.SurfaceControl.<init>(SurfaceControl.java:1358) at android.view.ViewRootImpl.<init>(ViewRootImpl.java:953) at android.view.ViewRootImpl.<init>(ViewRootImpl.java:1404) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:469) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:169) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:6088) at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:70) at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:60) at android.app.servertransaction.TransactionExecutor.executeLifecycleItem(TransactionExecutor.java:271) at android.app.servertransaction.TransactionExecutor.executeTransactionItems(TransactionExecutor.java:146) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:120) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:3088) at android.os.Handler.dispatchMessage(Handler.java:109) at android.os.Looper.loopOnce(Looper.java:250) at android.os.Looper.loop(Looper.java:340) at android.app.ActivityThread.main(ActivityThread.java:9875) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:621) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:957) Caused by: java.lang.ClassNotFoundException: android.os.ufw.UltraFrameworkComponentFactoryImpl at java.lang.Class.classForName(Native Method) at java.lang.BootClassLoader.findClass(ClassLoader.java:2693) at java.lang.BootClassLoader.loadClass(ClassLoader.java:2753) at java.lang.ClassLoader.loadClass(ClassLoader.java:573) at java.lang.Class.classForName(Native Method)  at java.lang.Class.forName(Class.java:607)  at java.lang.Class.forName(Class.java:512)  at android.os.ufw.UltraFrameworkComponentFactory.getInstance(UltraFrameworkComponentFactory.java:78)  at android.view.SurfaceControl.<init>(SurfaceControl.java:1358)  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:953)  at android.view.ViewRootImpl.<init>(ViewRootImpl.java:1404)  at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:469)  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:169)  at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:6088)  at android.app.servertransaction.ResumeActivityItem.execute(ResumeActivityItem.java:70)  at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:60)  at android.app.servertransaction.TransactionExecutor.executeLifecycleItem(TransactionExecutor.java:271)  at android.app.servertransaction.TransactionExecutor.executeTransactionItems(TransactionExecutor.java:146)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:120)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:3088)  at android.os.Handler.dispatchMessage(Handler.java:109)  at android.os.Looper.loopOnce(Looper.java:250)  at android.os.Looper.loop(Looper.java:340)  at android.app.ActivityThread.main(ActivityThread.java:9875)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:621)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:957)  Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available 2025-06-12 22:46:09.682 24133-24133 TAG com.software.hiltlearn E 初始化
06-13
<think>我们详细讨论`XposedHelpers.findAndHookMethod`的使用,这是Xposed框架中非常核心的一个方法,用于Hook指定类的方法。我们将涵盖以下内容:1.方法的基本用法2.参数解释3.使用示例(包括普通方法、构造方法、重载方法等)4.注意事项和常见错误首先,`XposedHelpers.findAndHookMethod`是Xposed框架提供的一个辅助方法,用于查找并Hook一个方法。它有多个重载版本,最常用的形式如下:```javaXC_MethodHook.UnhookfindAndHookMethod(StringclassName,ClassLoaderclassLoader,StringmethodName,Object...parameterTypesAndCallback)```参数说明:-`className`:要Hook的类的全名(包括包名)-`classLoader`:目标应用或系统的类加载器,通常从`loadPackageParam`中获取-`methodName`:要Hook的方法名-`parameterTypesAndCallback`:可变参数,前面是方法的参数类型(Class对象或字符串形式的类名),最后一个是`XC_MethodHook`实例注意:参数类型可以是Class对象(如`String.class`)或字符串(如`"java.lang.String"`)。如果方法有多个参数,则按顺序列出参数类型,最后一个参数必须是`XC_MethodHook`的实例。下面我们通过几个示例来展示其用法。###示例1:Hook一个无参数的方法假设我们要Hook`android.app.Activity`的`onCreate`方法(注意实际`onCreate`有参数,这里假设无参数版本用于示例,实际有参数):```java//假设在handleLoadPackage中publicvoidhandleLoadPackage(XC_LoadPackage.LoadPackageParamloadPackageParam)throwsThrowable{//确保是目标应用if(!loadPackageParam.packageName.equals("com.example.target"))return;//使用类加载器ClassLoadercl=loadPackageParam.classLoader;//HookActivity的onCreate方法(注意:实际onCreate有一个Bundle参数)XposedHelpers.findAndHookMethod("android.app.Activity",cl,"onCreate",newXC_MethodHook(){@OverrideprotectedvoidbeforeHookedMethod(MethodHookParamparam)throwsThrowable{//在目标方法执行前操作Activityactivity=(Activity)param.thisObject;Log.d("Xposed","ActivityonCreate:"+activity.getClass().getName());}@OverrideprotectedvoidafterHookedMethod(MethodHookParamparam)throwsThrowable{//在目标方法执行后操作}});}```###示例2:Hook带参数的方法现在我们来Hook实际的`onCreate`方法,它有一个`Bundle`参数:```javaXposedHelpers.findAndHookMethod("android.app.Activity",cl,"onCreate",Bundle.class,newXC_MethodHook(){@OverrideprotectedvoidbeforeHookedMethod(MethodHookParamparam)throwsThrowable{BundlesavedInstanceState=(Bundle)param.args[0];Activityactivity=(Activity)param.thisObject;Log.d("Xposed","ActivityonCreatewithsavedInstanceState:"+activity.getClass().getName());}});```或者使用字符串表示参数类型:```javaXposedHelpers.findAndHookMethod("android.app.Activity",cl,"onCreate","android.os.Bundle",newXC_MethodHook(){//...同上});```###示例3:Hook重载方法当存在重载方法时,需要指定参数类型来区分。例如,Hook`TextView`的`setText`方法,它有多个重载:```java//HooksetText(CharSequence)XposedHelpers.findAndHookMethod("android.widget.TextView",cl,"setText",CharSequence.class,newXC_MethodHook(){@OverrideprotectedvoidbeforeHookedMethod(MethodHookParamparam)throwsThrowable{CharSequencetext=(CharSequence)param.args[0];Log.d("Xposed","Settingtext:"+text);//可以修改参数param.args[0]="Hooked:"+text;}});//HooksetText(intresId)XposedHelpers.findAndHookMethod("android.widget.TextView",cl,"setText",int.class,newXC_MethodHook(){@OverrideprotectedvoidbeforeHookedMethod(MethodHookParamparam)throwsThrowable{intresId=(int)param.args[0];Log.d("Xposed","Settingtextfromresource:"+resId);}});```###示例4:Hook构造方法使用`findAndHookConstructor`来Hook构造方法,用法类似:```javaXposedHelpers.findAndHookConstructor("android.widget.TextView",cl,Context.class,newXC_MethodHook(){@OverrideprotectedvoidafterHookedMethod(MethodHookParamparam)throwsThrowable{TextViewtextView=(TextView)param.thisObject;Log.d("Xposed","TextViewcreatedwithcontext:"+textView.getContext());}});```###注意事项:1.**类加载器**:必须使用目标应用的类加载器,否则可能找不到类。在`handleLoadPackage`中,可以通过`loadPackageParam.classLoader`获取。2.**参数匹配**:参数类型必须完全匹配,包括基本类型和引用类型(如`int.class`和`Integer.class`不同)。3.**异常处理**:在`beforeHookedMethod`中抛出异常会阻止原方法执行,在`afterHookedMethod`中抛出异常会替代原方法的返回值(如果原方法有返回值)。4.**性能考虑**:避免在Hook方法中执行耗时操作,因为这会拖慢目标应用。5.**多个Hook**:同一个方法可以被多次Hook,执行顺序按照Hook的先后顺序(before按正序,after按逆序)。6.**移除Hook**:`findAndHookMethod`返回`XC_MethodHook.Unhook`对象,可以调用其`unhook`方法来移除Hook。###示例5:移除Hook```javaXC_MethodHook.Unhookunhook=XposedHelpers.findAndHookMethod(...);//在需要的时候移除Hookunhook.unhook();```###示例6:Hook系统服务的方法有时需要Hook系统服务中的方法,这时要注意类加载器。系统服务通常在系统进程中,可以使用`null`作为类加载器(表示系统类加载器)或者使用`XposedBridge.BOOTCLASSLOADER`。```java//例如HookActivityManagerService的某个方法Class<?>activityManagerServiceClass=XposedHelpers.findClass("com.android.server.am.ActivityManagerService",null);XposedHelpers.findAndHookMethod(activityManagerServiceClass,"startActivity",...);```###总结`XposedHelpers.findAndHookMethod`是Xposed模块开发中最常用的方法之一,它简化了查找和Hook方法的过程。使用时需要注意正确的类名、方法名和参数类型,以及使用合适的类加载器。§§相关问题§§:1.如何Hook一个类的静态方法?2.当Hook的方法有多个重载时,如何确保Hook到正确的版本?3.在Hook过程中,如何修改方法的参数或返回值?4.如果目标方法在Android不同版本中签名发生了变化,如何处理兼容性?</think>### XposedHelpers.findAndHookMethod 详解 `XposedHelpers.findAndHookMethod` 是 Xposed 框架中最核心的 Hook 方法之一,用于动态查找并 Hook 目标类的方法。以下是全面解析和最佳实践: #### 方法签名与参数说明 ```java public static XC_MethodHook.Unhook findAndHookMethod( String className, // 目标类的全限定名 ClassLoader classLoader, // 目标类加载器 String methodName, // 目标方法名 Object... parameterTypesAndCallback // 参数类型 + Hook回调 ) ``` 参数说明: 1. **className**:目标类的全限定名(如 `"android.app.Activity"`) 2. **classLoader**:目标应用类加载器(通常从 `lpparam.classLoader` 获取) 3. **methodName**:要 Hook 的方法名 4. **parameterTypesAndCallback**:可变参数,包含: - 方法参数类型(Class 对象或字符串) - 最后的参数必须是 `XC_MethodHook` 实例 #### 基本用法示例 ```java XposedHelpers.findAndHookMethod( "android.app.Activity", lpparam.classLoader, "onCreate", Bundle.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { // 在Activity.onCreate执行前的逻辑 Activity activity = (Activity) param.thisObject; Log.d("Xposed", "Activity created: " + activity.getClass().getName()); } @Override protected void afterHookedMethod(MethodHookParam param) { // 在Activity.onCreate执行后的逻辑 } } ); ``` #### 高级用法与技巧 ##### 1. Hook 重载方法 当方法有重载时,需要明确指定参数类型: ```java // Hook TextView.setText(CharSequence) XposedHelpers.findAndHookMethod( "android.widget.TextView", classLoader, "setText", CharSequence.class, new XC_MethodHook() { /* ... */ } ); // Hook TextView.setText(int) XposedHelpers.findAndHookMethod( "android.widget.TextView", classLoader, "setText", int.class, new XC_MethodHook() { /* ... */ } ); ``` ##### 2. Hook 静态方法 ```java XposedHelpers.findAndHookMethod( "android.os.SystemProperties", classLoader, "get", String.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { // 静态方法中param.thisObject为null String key = (String) param.args[0]; if ("ro.build.version".equals(key)) { param.setResult("Hooked Version"); // 修改返回值 } } } ); ``` ##### 3. Hook 构造方法 ```java XposedHelpers.findAndHookConstructor( "com.example.targetapp.SensitiveClass", classLoader, Context.class, new XC_MethodHook() { @Override protected void afterHookedMethod(MethodHookParam param) { // 获取新创建的实例 Object instance = param.thisObject; // 修改实例行为 XposedHelpers.setObjectField(instance, "secretField", "modified"); } } ); ``` ##### 4. 参数类型使用字符串表示 当无法直接获取 Class 对象时: ```java XposedHelpers.findAndHookMethod( "com.example.internal.InternalClass", classLoader, "internalMethod", "com.example.internal.ParamType", // 字符串形式参数类型 "android.os.Bundle", new XC_MethodHook() { /* ... */ } ); ``` ##### 5. 修改方法行为 ```java XposedHelpers.findAndHookMethod( "android.telephony.TelephonyManager", classLoader, "getDeviceId", new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { // 完全替换原始方法 param.setResult("000000000000000"); } } ); ``` #### 最佳实践与注意事项 ##### 1. 错误处理 ```java try { XposedHelpers.findAndHookMethod(/* ... */); } catch (Throwable t) { // 处理找不到类/方法的情况 XposedBridge.log("Hook failed: " + t); } ``` ##### 2. 性能优化 ```java // 预先查找类和方法 Class<?> targetClass = XposedHelpers.findClass("com.example.Target", classLoader); XposedBridge.hookAllMethods(targetClass, "targetMethod", new XC_MethodHook() { // 比findAndHookMethod更高效 }); ``` ##### 3. 条件化 Hook ```java public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) { if (lpparam.packageName.equals("com.target.app")) { hookSpecificMethods(lpparam.classLoader); } else if (lpparam.packageName.equals("android")) { hookSystemMethods(lpparam.classLoader); } } private void hookSpecificMethods(ClassLoader cl) { // 应用特定Hook } ``` ##### 4. 动态参数修改 ```java XposedHelpers.findAndHookMethod( "android.view.View", classLoader, "setOnClickListener", View.OnClickListener.class, new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { // 获取原始监听器 View.OnClickListener original = (View.OnClickListener) param.args[0]; // 创建代理监听器 param.args[0] = new View.OnClickListener() { @Override public void onClick(View v) { Log.d("Xposed", "Click intercepted!"); original.onClick(v); } }; } } ); ``` #### 高级模式:方法 Hook 管理器 ```java public class MethodHookManager { private static final Map<String, List<XC_MethodHook.Unhook>> activeHooks = new HashMap<>(); public static void hookMethodForPackage( String packageName, String className, String methodName, Object[] params, XC_MethodHook callback ) { try { XC_MethodHook.Unhook unhook = XposedHelpers.findAndHookMethod( className, getClassLoaderForPackage(packageName), methodName, params, callback ); activeHooks.computeIfAbsent(packageName, k -> new ArrayList<>()) .add(unhook); } catch (Throwable t) { // 错误处理 } } public static void unhookAllForPackage(String packageName) { List<XC_MethodHook.Unhook> hooks = activeHooks.get(packageName); if (hooks != null) { for (XC_MethodHook.Unhook unhook : hooks) { unhook.unhook(); } hooks.clear(); } } private static ClassLoader getClassLoaderForPackage(String packageName) { // 实现获取特定包类加载器的逻辑 } } // 使用示例 MethodHookManager.hookMethodForPackage( "com.example.app", "com.example.app.MainActivity", "onCreate", new Object[] { Bundle.class }, new XC_MethodHook() { /* ... */ } ); ``` #### 兼容性处理技巧 ##### 1. 多版本适配 ```java public void hookMultiVersion(ClassLoader classLoader) { String[] methodVariants = { "getDeviceId", "getDeviceIdForSlot" }; for (String method : methodVariants) { try { XposedHelpers.findAndHookMethod( "android.telephony.TelephonyManager", classLoader, method, new XC_MethodHook() { /* ... */ } ); break; // 成功一个即停止 } catch (NoSuchMethodError ignored) { // 尝试下一个变体 } } } ``` ##### 2. 参数类型适配 ```java Object[] paramTypes; if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { paramTypes = new Object[] { int.class, String.class }; } else { paramTypes = new Object[] { String.class }; } XposedHelpers.findAndHookMethod( "com.example.DeviceInfo", classLoader, "getIdentifier", paramTypes, new XC_MethodHook() { /* ... */ } ); ``` #### 调试与日志 ```java XC_MethodHook debugHook = new XC_MethodHook() { @Override protected void beforeHookedMethod(MethodHookParam param) { logMethodCall(param, "Enter"); } @Override protected void afterHookedMethod(MethodHookParam param) { logMethodCall(param, "Exit"); } private void logMethodCall(MethodHookParam param, String prefix) { StringBuilder sb = new StringBuilder(prefix) .append(": ") .append(param.method.getName()) .append("("); for (int i = 0; i < param.args.length; i++) { if (i > 0) sb.append(", "); sb.append(param.args[i] != null ? param.args[i].toString() : "null"); } sb.append(")"); XposedBridge.log(sb.toString()); } }; XposedHelpers.findAndHookMethod("com.example.DebugClass", classLoader, "targetMethod", debugHook); ``` ### 总结 `XposedHelpers.findAndHookMethod` 是 Xposed 模块开发的基石,关键点包括: 1. 灵活处理各种方法签名(重载、静态、构造方法) 2. 参数修改和返回值拦截能力 3. 结合错误处理和兼容性设计 4. 通过管理器模式实现高级控制 5. 调试和日志记录技术 正确使用此方法可以实现强大的运行时行为修改,同时保持代码的可维护性和稳定性。
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