Introduce

YukiHookAPI is an integrated Hook API Framework, which does not provide any Hook functions, and needs the support of Xposed related basic APIs.

Background

This is an efficient Hook API rebuilt based on the Xposed API using Kotlin, and creates rich function extensions for the development of Xposed Modules.

The name is taken from "ももくり" heroine Yuki Kurihara.

Formerly the Innocent Xposed API used in Development Learning Project, now renamed and open sourced.

Usage

YukiHookAPI is built entirely with Kotlin lambda syntax.

Abandoning the original less friendly XposedHelpers, you can use it to easily create Xposed Modules and easily implement custom Hook API.

Language Requirement

Please use Kotlin, the framework part of the code composition is also compatible with Java but the implementation of the basic Hook scene may not work at all.

All demo code in this document will be described using Kotlin, if you don't know how to use Kotlin then you may not be able to use YukiHookAPI.

Part of the Java Demo code can be found here, but not recommended.

Source of Inspiration

Previously, when we built an Xposed Module, we first needed to create an xposed_init file under assets.

Then, manually fill in your own entry class name into the file and use XposedHelpers to implement our Hook logic.

Since Kotlin is the main Android development language, this API is really not very elegant to use.

Is there any easy to use, light, elegant solution?

With this idea, YukiHookAPI was born.

Now, we only need to write a small amount of code, and all the time and expense are handed over to automation.

With Kotlin's elegant lambda writing and YukiHookAPI, you can make your Hook logic more beautiful and clear.

The following example

@InjectYukiHookWithXposed
object HookEntry : IYukiHookXposedInit {

    override fun onHook() = encase {
        loadZygote {
            ActivityClass.hook {
                injectMember {
                    method {
                        name = "onCreate"
                        param(BundleClass)
                    }
                    beforeHook {
                        // Your code here.
                    }
                    afterHook {
                        // Your code here.
                    }
                }
            }
            resources().hook {
                injectResource {
                    conditions {
                        name = "sym_def_app_icon"
                        mipmap()
                    }
                    replaceToModuleResource(R.mipmap.ic_launcher)
                }
            }
        }
        loadApp(name = "com.android.browser") {
            ActivityClass.hook {
                injectMember {
                    method {
                        name = "onCreate"
                        param(BundleClass)
                    }
                    beforeHook {
                        // Your code here.
                    }
                    afterHook {
                        // Your code here.
                    }
                }
            }
            resources().hook {
                injectResource {
                    conditions {
                        name = "ic_launcher"
                        mipmap()
                    }
                    replaceToModuleResource(R.mipmap.ic_launcher)
                }
            }
        }
    }
}

class HookEntry : IXposedHookZygoteInit, IXposedHookLoadPackage, IXposedHookInitPackageResources {

    private lateinit var moduleResources: XModuleResources

    override fun initZygote(sparam: IXposedHookZygoteInit.StartupParam) {
        moduleResources = XModuleResources.createInstance(sparam.modulePath, null)
        XResources.setSystemWideReplacement(
            "android", "mipmap", "sym_def_app_icon",
            moduleResources.fwd(R.mipmap.ic_launcher)
        )
        XposedHelpers.findAndHookMethod(
                Activity::class.java.name,
                null, "onCreate",
                Bundle::class.java,
                object : XC_MethodHook() {
                    override fun beforeHookedMethod(param: MethodHookParam?) {
                        // Your code here.
                    }

                    override fun afterHookedMethod(param: MethodHookParam?) {
                        // Your code here.
                    }
                })
    }

    override fun handleLoadPackage(lpparam: XC_LoadPackage.LoadPackageParam) {
        if (lpparam.packageName == "com.android.browser")
            XposedHelpers.findAndHookMethod(
                Activity::class.java.name,
                lpparam.classLoader, "onCreate",
                Bundle::class.java,
                object : XC_MethodHook() {
                    override fun beforeHookedMethod(param: MethodHookParam?) {
                        // Your code here.
                    }

                    override fun afterHookedMethod(param: MethodHookParam?) {
                        // Your code here.
                    }
                })
    }

    override fun handleInitPackageResources(resparam: XC_InitPackageResources.InitPackageResourcesParam) {
        if (resparam.packageName == "com.android.browser")
            resparam.res.setReplacement(
                "com.android.browser", "mipmap", "ic_launcher",
                moduleResources.fwd(R.mipmap.ic_launcher)
            )
    }
}

Yes, you read that right, just needing these codes can completely replace the Xposed API to achieve the same function.

Now, with the help of the efficient and powerful YukiHookAPI, you can implement a very simple Xposed Module.

Suppored Hook Framework

The following are the Hook Framework and Xposed framework supported by YukiHookAPI.

Hook Framework	ST	Description
LSPosed	✅	Stable use in multiple scenarios
LSPatch	⭕	WIP after this project is improved
EdXposed	❎	Maintenance has stopped, no longer recommended
Pine	⭕	Only available
SandHook	⭕	Only available
Whale	⭕	Need xposed-hook-based-on-whale
YAHFA	❗	Need to implement the Xposed API yourself
FastHook	❗	Need to implement the Xposed API yourself
Epic	❗	Need Dexposed by yourself
TaiChi	⭕	Only available for Xposed Module
Xposed	⭕	Recommended minimum system version is Android 7.0