利用Android.bp來編譯so庫

在SimpleHook模塊中钾腺，我們使用了以下構建腳本來建議Android.bp

cc_library {
 
    name："libsecAI",
    host_supported: true,
    
    shared_libs:[
        "libnativehelper",
        "libart",
        "liblog",
    ],
    
    local_include_dirs:[
        "include",
    ],
    
    arch:{
        arm: {
            srcs: [
                "AIHook.cpp",
                "HookPage.cpp",
            ],
        },
        arm64:{
            srcs: [
                    "AIHook.cpp",
                    "HookPage.cpp",
                ],
        },  
    },
    
    cppflags：[
        "-DART_STACK_OVERFLOW_GAP_arm=8912",
        "-DART_STACK_OVERFLOW_GAP_arm64=8912",
        "-DART_STACK_OVERFLOW_GAP_mips=16384",
        "-DART_STACK_OVERFLOW_GAP_mips64=16384",
        "-DART_STACK_OVERFLOW_GAP_x86=16384",
        "-DART_STACK_OVERFLOW_GAP_x86_64=20480",
        "-DIMT_SIZE=43",
    ],
    cpp_std:"c++17",

}

可以看出，Android.bp文件的語法與json文件的形式很類似讥裤。這里cc_library是用來生成native庫的(so包)放棒，常用的屬性：

• name： 指定了生成的lib包的名字
• host_supported：當該模塊依賴的某個模塊中存在該屬性，則依賴它的模塊都需要配置該屬性
• local_include_dirs：項目內的頭文件目錄依賴己英，這里是相對路徑
• cppflag：編譯的flag選項间螟，示例中定義了一些工程依賴的宏的定義
• cpp_std: 指定了編譯器依賴的語言編譯標準
• arch: 用來指定需要的目標編譯平臺，諸如arm损肛， arm64厢破，x86等，在srcs中指定需要依賴的源碼文件（以相對文件的形式給出）
• srcs：常見的還可以直接在最外層用srcs屬性配置工程源碼文件
• include_dirs: 指定依賴的頭文件治拿，這里的頭文件可以為模塊外的頭文件摩泪，以相對整個Android工程路徑給出。
• export_include_dirs: 是否將頭文件導出忍啤；這使得依賴該模塊的模塊無需再引用依賴模塊的頭文件目錄加勤。

利用Android.bp來編譯Java庫

來看下framework模塊的bp文件

java_library {
    name: "framework",

    srcs: [
        // From build/make/core/pathmap.mk FRAMEWORK_BASE_SUBDIRS
        "core/java/**/*.java",
        "graphics/java/**/*.java",
        "location/java/**/*.java",
        "lowpan/java/**/*.java",
      .....

        ":framework-javastream-protos",

        "core/java/android/accessibilityservice/IAccessibilityServiceConnection.aidl",
        "core/java/android/accessibilityservice/IAccessibilityServiceClient.aidl",
       
        "media/java/android/media/session/ISessionControllerCallback.aidl",
       ......

        ":framework-statslog-gen",
    ],

    aidl: {
        export_include_dirs: [
            // From build/make/core/pathmap.mk FRAMEWORK_BASE_SUBDIRS
            "core/java",
            "graphics/java",
            "location/java",
            "lowpan/java",
            "media/java",
            "media/mca/effect/java",
            "media/mca/filterfw/java",
            "media/mca/filterpacks/java",
            "drm/java",
            "opengl/java",
            "sax/java",
            "telecomm/java",
            "telephony/java",
            "wifi/java",
            "keystore/java",
            "rs/java",
        ],

        include_dirs: [
            "system/update_engine/binder_bindings",     
            "system/bt/binder",
            "system/security/keystore/binder",
        ],
    },

    exclude_srcs: [
        // See comment on framework-atb-backward-compatibility module below
        "core/java/android/content/pm/AndroidTestBaseUpdater.java",
        // See comment on framework-oahl-backward-compatibility module below
        "core/java/android/content/pm/OrgApacheHttpLegacyUpdater.java",
    ],

    no_framework_libs: true,
    libs: [
        "conscrypt",
        "okhttp",
        "bouncycastle",
        "ext",
    ],

    static_libs: [
        "framework-protos",
        "android.hidl.base-V1.0-java",
        "android.hardware.cas-V1.0-java",     
    ],

    // Loaded with System.loadLibrary by android.view.textclassifier
    required: [
        "libtextclassifier",
        "libmedia2_jni",
    ],

    javac_shard_size: 150,

    dxflags: [
        "--core-library",
        "--multi-dex",
    ],
}

首先java_library說明了編譯的是java庫仙辟，另外還可能有java_library_static，file_group等屬性,這里面有好多屬性鳄梅，我們重點關注幾個選項叠国。

• name：指定了模塊名
• static_libs:指定了依賴的靜態(tài)庫（將被打入到jar中）
• libs: 共享庫
• srcs：指定模塊中含有的java代碼，這里也可以指定aidl文件戴尸。這里通過 "core/java/**/*.java",這種寫法來覆蓋某個路徑下的所有java文件
• aidl： 一般我們會在這里面指定aidl文件相對路徑