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implement HideAbi module
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‎HideAbi/Readme.md‎

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# HideAbi
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Hide specific CPU ABIs from apps.
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This module hooks `android.os.Build.SUPPORTED_{,{64,32}_BIT_}ABIS` to filter out selected ABIs from being reported to applications.
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Useful for controlling which architecture apps use or convincing an app store to download the correct apk.

‎HideAbi/build.gradle.kts‎

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plugins {
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alias(libs.plugins.buildlogic.android.application)
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alias(libs.plugins.buildlogic.kotlin.android)
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}
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android {
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namespace = "de.binarynoise.HideAbi"
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defaultConfig {
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minSdk = 21
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targetSdk = 36
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buildConfigField("String", "SHARED_PREFERENCES_NAME", "\"hide_abi\"")
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}
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buildFeatures {
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buildConfig = true
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}
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}
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dependencies {
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implementation(projects.reflection)
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implementation(projects.logger)
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implementation(libs.hiddenapibypass)
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implementation(libs.androidx.fragment.ktx)
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implementation(libs.androidx.preference.ktx)
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}

‎HideAbi/src/debug/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest
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xmlns:android="http://schemas.android.com/apk/res/android">
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<application android:theme="@android:style/Theme.DeviceDefault.Settings">
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<activity
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android:name=".AbisActivity"
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android:exported="true"
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>
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<action android:name="android.intent.action.VIEW" />
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<category android:name="android.intent.category.LAUNCHER" />
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<category android:name="android.intent.category.DEFAULT" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎HideAbi/src/debug/java/de/binarynoise/HideAbi/AbisActivity.kt‎

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package de.binarynoise.HideAbi
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import android.os.Build
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import android.os.Bundle
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import android.widget.TextView
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import androidx.activity.ComponentActivity
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import de.binarynoise.HideAbi.BuildConfig.SHARED_PREFERENCES_NAME
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class AbisActivity : ComponentActivity(R.layout.abis_activity) {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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findViewById<TextView>(R.id.supported_abis).text = Build.SUPPORTED_ABIS.joinToString("\n")
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val sharedPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, MODE_WORLD_READABLE)
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findViewById<TextView>(R.id.preferences).text = sharedPreferences.all.entries.joinToString("\n") { (k, v) -> "$k -> $v" }
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}
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}

‎HideAbi/src/debug/res/layout/abis_activity.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<LinearLayout
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xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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android:layout_width="match_parent"
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android:layout_height="match_parent"
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android:orientation="vertical"
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android:padding="8dp"
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>
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<TextView
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:text="SUPPORTED_ABIS:"
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android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
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/>
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<TextView
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android:id="@+id/supported_abis"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:textAppearance="@android:style/TextAppearance.DeviceDefault"
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tools:text="arm64\narm"
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/>
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<TextView
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:text="Preferences:"
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android:textAppearance="@android:style/TextAppearance.DeviceDefault.Medium"
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/>
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<TextView
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android:id="@+id/preferences"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:textAppearance="@android:style/TextAppearance.DeviceDefault"
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tools:text="whatever"
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/>
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</LinearLayout>

‎HideAbi/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest
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xmlns:android="http://schemas.android.com/apk/res/android">
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<application
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android:icon="@mipmap/ic_launcher"
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android:label="HideAbi"
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android:theme="@android:style/Theme.DeviceDefault.Settings"
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>
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<meta-data
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android:name="xposedmodule"
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android:value="true"
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/>
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<meta-data
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android:name="xposeddescription"
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android:value="Hide ABIs from apps"
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/>
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<meta-data
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android:name="xposedminversion"
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android:value="93"
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/>
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<meta-data
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android:name="xposedscope"
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android:resource="@array/scope"
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/>
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<activity
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android:name=".SettingsActivity"
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android:exported="true"
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>
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="de.robv.android.xposed.category.MODULE_SETTINGS" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎HideAbi/src/main/assets/xposed_init‎

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de.binarynoise.HideAbi.Hook

‎HideAbi/src/main/java/de/binarynoise/HideAbi/AbiCategory.kt‎

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package de.binarynoise.HideAbi
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import android.os.Build
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enum class AbiCategory(val property: String, val getter: () -> Array<String>) {
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SUPPORTED_ABIS("ro.product.cpu.abilist", { Build.SUPPORTED_ABIS }),
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SUPPORTED_64_BIT_ABIS("ro.product.cpu.abilist64", { Build.SUPPORTED_64_BIT_ABIS }),
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SUPPORTED_32_BIT_ABIS("ro.product.cpu.abilist32", { Build.SUPPORTED_32_BIT_ABIS }),
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;
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fun getPreferenceKeyFor(abi: String): String {
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return "${this.property}_$abi"
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}
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companion object {
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fun fromProperty(property: String): AbiCategory? {
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return entries.find { it.property == property }
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}
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}
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}

‎HideAbi/src/main/java/de/binarynoise/HideAbi/Hook.kt‎

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package de.binarynoise.HideAbi
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import java.lang.reflect.Method
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import android.os.Build
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import de.binarynoise.reflection.cast
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import de.binarynoise.reflection.makeAccessible
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import de.robv.android.xposed.IXposedHookLoadPackage
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import de.robv.android.xposed.XSharedPreferences
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import de.robv.android.xposed.XposedBridge
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import de.robv.android.xposed.XposedHelpers
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import de.robv.android.xposed.callbacks.XC_LoadPackage
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import org.lsposed.hiddenapibypass.HiddenApiBypass
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import de.robv.android.xposed.XC_MethodHook as MethodHook
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class Hook : IXposedHookLoadPackage {
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override fun handleLoadPackage(lpparam: XC_LoadPackage.LoadPackageParam) {
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val BuildClass = XposedHelpers.findClass("android.os.Build", lpparam.classLoader)
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val getStringList: Method = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
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HiddenApiBypass.getDeclaredMethod(BuildClass, "getStringList", String::class.java, String::class.java)
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} else {
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BuildClass.getDeclaredMethod("getStringList", String::class.java, String::class.java)
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}
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getStringList.makeAccessible()
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val prefs = XSharedPreferences(BuildConfig.APPLICATION_ID, BuildConfig.SHARED_PREFERENCES_NAME)
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XposedBridge.hookMethod(
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getStringList,
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object : MethodHook() {
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override fun afterHookedMethod(param: MethodHookParam) {
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with(param) {
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val property = args.first().cast<String>()
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val abiCategory = AbiCategory.fromProperty(property) ?: return
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val result = param.result.cast<Array<String>>()
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val filtered = result.filterNot { abi ->
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prefs.getBoolean(abiCategory.getPreferenceKeyFor(abi), false)
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}
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param.result = filtered.toTypedArray()
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}
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}
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},
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)
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AbiCategory.entries.forEach { entry ->
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XposedHelpers.setStaticObjectField(Build::class.java, entry.name, getStringList(null, entry.property, ","))
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}
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}
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}

‎HideAbi/src/main/java/de/binarynoise/HideAbi/SettingsActivity.kt‎

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package de.binarynoise.HideAbi
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import kotlin.contracts.ExperimentalContracts
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import kotlin.contracts.InvocationKind
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import kotlin.contracts.contract
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import android.content.Context
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import android.os.Bundle
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import androidx.fragment.app.FragmentActivity
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import androidx.preference.CheckBoxPreference
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import androidx.preference.Preference
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import androidx.preference.PreferenceCategory
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import androidx.preference.PreferenceFragmentCompat
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import androidx.preference.PreferenceGroup
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import androidx.preference.children
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import de.binarynoise.HideAbi.BuildConfig.SHARED_PREFERENCES_NAME
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import de.binarynoise.reflection.cast
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class SettingsActivity : FragmentActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.settings_activity)
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if (savedInstanceState == null) {
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supportFragmentManager.beginTransaction().replace(R.id.settings, SettingsFragment()).commit()
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}
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actionBar?.setDisplayHomeAsUpEnabled(true)
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}
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override fun onNavigateUp(): Boolean {
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finishAndRemoveTask()
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return true
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}
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class SettingsFragment : PreferenceFragmentCompat() {
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override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
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preferenceManager.sharedPreferencesName = SHARED_PREFERENCES_NAME
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preferenceManager.sharedPreferencesMode = MODE_WORLD_READABLE
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val ctx = preferenceManager.context
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preferenceScreen = preferenceManager.createPreferenceScreen(ctx)
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preferenceScreen.apply {
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for (category in AbiCategory.entries) {
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addPreference(PreferenceCategory(ctx)) {
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title = category.name
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val abis = ctx.getHardwareABIs(category)
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for (abi in abis) {
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addPreference(CheckBoxPreference(ctx)) {
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key = category.getPreferenceKeyFor(abi)
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title = abi
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summaryOn = "This ABI will be hidden and not reported to apps"
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summaryOff = "This ABI will be reported to apps"
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}
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}
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}
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}
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setIconSpaceReservedRecursive(false)
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}
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}
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/**
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* Returns the hardware ABIs for the given property.
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* Combines the ABIs we currently see with the ones that are hooked from the preferences (and can't see).
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*/
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fun Context.getHardwareABIs(property: AbiCategory): Set<String> {
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val sharedPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, MODE_WORLD_READABLE)
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return (property.getter() + sharedPreferences.all //
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.filter { (k, v) -> k.startsWith(property.property) && (v?.cast<Boolean?>() == true) } //
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.keys //
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.map { it.substringAfter("_") } //
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.toTypedArray()) //
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.toSet()
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}
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@OptIn(ExperimentalContracts::class)
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inline fun <T : Preference> PreferenceGroup.addPreference(preference: T, setup: T.() -> Unit) {
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contract {
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callsInPlace(setup, InvocationKind.EXACTLY_ONCE)
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}
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val isPreferenceGroup = preference is PreferenceGroup
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if (isPreferenceGroup) {
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// PreferenceGroup needs to be added to the tree before other preferences can be added to it
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addPreference(preference)
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}
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preference.apply(setup)
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if (!isPreferenceGroup) {
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// normal preferences need the setup applied before being added to the tree
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addPreference(preference)
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}
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}
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private fun Preference.setIconSpaceReservedRecursive(iconSpaceReserved: Boolean = false) {
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this.isIconSpaceReserved = iconSpaceReserved
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if (this is PreferenceGroup) this.children.forEach { it.setIconSpaceReservedRecursive(iconSpaceReserved) }
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}
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}
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}

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