将Android应用的build.gradle文件转换为Android.mk文件技术问询

Alright, let's convert your Gradle build config into the equivalent Android.mk (plus Application.mk, since some split and ABI settings live there—they work hand-in-hand for native Android builds). Here's how to map each part of your original Gradle setup:

This file handles your app's base setup, resource filtering, and ProGuard rules. Replace placeholder values like YourAppName with your actual project details:

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

# Equivalent to `resConfigs "en","ja"` in Gradle
# List ONLY the language resource directories you want to keep
LOCAL_RESOURCE_DIR := \
    $(LOCAL_PATH)/res/values-en \
    $(LOCAL_PATH)/res/values-ja \
    # Add other language-specific resource dirs here (e.g., drawable-en, layout-ja)

# Basic app configuration (update these for your project)
LOCAL_PACKAGE_NAME := YourAppName
LOCAL_PACKAGE_MODULE := true
LOCAL_CERTIFICATE := platform  # Use your release keystore path for production builds

# Equivalent to `minifyEnabled true`, `useProguard true`, and proguard rules in Gradle
LOCAL_PROGUARD_ENABLED := full
LOCAL_PROGUARD_FLAG_FILES := proguard-rules.pro
# Optional: Explicitly include the default Android ProGuard file if needed
# LOCAL_PROGUARD_FLAG_FILES += $(SYSROOT)/usr/share/proguard/proguard-android.txt

include $(BUILD_PACKAGE)

Key Mapping Notes: #

• LOCAL_RESOURCE_DIR explicitly lists the language-specific resource directories you want to include, which mimics Gradle's resConfigs by excluding all other languages. Be sure to add any other language-specific resource folders (like drawable-en) if your app uses them.
• LOCAL_PROGUARD_ENABLED := full enables full ProGuard obfuscation, matching Gradle's minifyEnabled true and useProguard true. The LOCAL_PROGUARD_FLAG_FILES points to your custom rules file, just like proguard-rules.pro in Gradle.

Most split configurations live here, since they're global to the build rather than app-specific:

# Equivalent to ABI splits in Gradle: include x86, armeabi-v7a, mips; disable universal APK
APP_ABI := x86 armeabi-v7a mips
APP_UNIVERSAL_APK := false

# Equivalent to density splits: exclude ldpi, tvdpi, xxxhdpi
# Note: Android build system requires explicitly listing included densities, not excluded ones
APP_DENSITY := mdpi hdpi xhdpi xxhdpi

Key Mapping Notes: #

• APP_ABI lists exactly the ABIs you want to build for, and APP_UNIVERSAL_APK := false ensures no combined "universal" APK is generated—this matches your Gradle abi split config.
• For density splits, Gradle lets you exclude specific densities, but the native build system requires you to list the ones you want to include. We've excluded ldpi, tvdpi, xxxhdpi by only including mdpi, hdpi, xhdpi, xxhdpi.

Gradle's shrinkResources true automatically removes unused resources, but there's no direct equivalent in Android.mk. To replicate this, you'll need to use a separate tool like:

• Android SDK's aapt: Run aapt list --unused-resources to scan for unused resources, then delete them before building.
• Tencent ResGuard: A third-party tool that integrates with native builds to shrink and obfuscate resources.

This requires adding a pre-build script to your build workflow, as the native build system doesn't include built-in resource shrinking.

内容的提问来源于stack exchange，提问作者Ranjith KP