Android.bp与Android.mk

从AndroidO开始，Android开始使用Android.bp来管理代码的编译，Android通过soong和blueprint将Android.bp转换为ninja文件(保存在out/soong/build.ninja)，通过ckati将Android.mk转换为ninja文件(保存在out/buil-$(target).ninja)。然后将这两个ninja文件include到一个文件，最后使用ninja来编译。

在Android.bp中定义的模块在Android.mk中可以依赖，但是Android.bp中的模块不能依赖Android.mk中的模块。如果需要在Android.bp中依赖Android.mk中模块需要将依赖的Android.mk转换为Android.mk。简单的转换可以直接使用工具:out/soong/host/linux-x86/bin/androidmk。

例如需要将如下的Android.mk换换为Android.bp。

#
# Copyright (C) 2008 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE_TAGS := optional

# This is the target being built.
LOCAL_PACKAGE_NAME := UpgradeExample

# Only compile source java files in this apk.
LOCAL_SRC_FILES := $(call all-java-files-under, src)

# Link against the current Android SDK.
LOCAL_SDK_VERSION := current

LOCAL_PROGUARD_ENABLED := disabled

include $(BUILD_PACKAGE)

通过使用命令转换：androidmk Android.mk > Android.bp

// Copyright (C) 2008 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

android_app {

    // This is the target being built.
    name: "UpgradeExample",

    // Only compile source java files in this apk.
    srcs: ["src/**/*.java"],

    // Link against the current Android SDK.
    sdk_version: "current",

    optimize: {
        enabled: false,
    },

}