Android-随机包名

本文代码主要来源 Magisk, 主要代码语言为 kotlin.

原理

修改 AndroidManifest.xml 的 package (包名) 和 android:label (应用名) 来修改 app 包名.

代码

private suspend fun patchAndHide(
        activity: Activity,
        label: String,
        onFailure: Runnable,
        path: String 
    ): Boolean {
//        val stub = File(activity.cacheDir, "stub.apk")
        val stub = File(path) //拿到自身app的apk文件

        // Generate a new random package name and signature
        val repack = File(activity.cacheDir, "patched.apk")

        val pkg = genPackageName() //随机生成包名

        if (!patch(activity, stub, FileOutputStream(repack), pkg, label)) //修改AndroidManifest.xml文件
            return false

        // Install
        val cmd = "pm install ${repack.absolutePath}"
        return if(Shell.su(cmd).exec().isSuccess){ //pm install安装新的apk
            UiThreadHandler.run { Toast.makeText(activity, "随机包名安装成功,应用名:${label}", Toast.LENGTH_LONG).show() }
            true
        }else{
            UiThreadHandler.run { Toast.makeText(activity, "随机包名安装失败", Toast.LENGTH_LONG).show() }
            false
        }
    }

fun patch(
        context: Context,
        apk: File, out: OutputStream,
        pkg: String, label: CharSequence
    ): Boolean {
        val info = context.packageManager.getPackageArchiveInfo(apk.path, 0) ?: return false
        val name = info.applicationInfo.nonLocalizedLabel.toString()
        try {
            JarMap.open(apk, true).use { jar ->
                val je = jar.getJarEntry(ANDROID_MANIFEST)
                val xml = AXML(jar.getRawData(je))//打开原apk的AndroidManifest.xml文件

                if (!xml.findAndPatch(APPLICATION_ID to pkg, name to label.toString())) //替换掉原包名和应用名.
                    return false

                // Write apk changes
                jar.getOutputStream(je).use { it.write(xml.bytes) }
                val keys = Keygen(context)
                SignApk.sign(keys.cert, keys.key, jar, out)//apk签名
                return true
            }
        } catch (e: Exception) {
            Timber.e(e)
            return false
        }
    }

核心代码就这么点，是不是很简单？

最后

Magisk 的代码里会默认替换所有匹配的包名，所以启动的 Activity 包名不要和 package 名一致。本项目 (kotlin) 源码见 Github:
https://github.com/PShocker/HideAPK

JAVA 版本可以参考小五的代码:
https://github.com/xw103/DeepApp/tree/master/hide

测试用例:
https://github.com/PShocker/HideAPK/releases/download/1.0/app-release.apk