Android Studio 3.0.1不会构建NDK静态库

Posted 2021-04-21

我正在尝试在我的android Studio项目中构建并包含一个静态库。我的项目在没有静态库的情况下构建并运行良好。

我的顶级Android.mk包括2个显式的SQLite.mk和Hello.mk行。

我已经在所有这些.mk文件中指定了完整路径，仅仅是为了我自己的理智。

SQLite.mk如下：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

JNILIB_PATH := C:/androidprojects/SDLTest_SQLite/app/jniLibs 

SRC_SQLITE := C:/androidprojects/SDLTest_SQLite/app/jni/SQLite/sqlite3.c

LOCAL_CFLAGS += -Wno-write-strings

LOCAL_MODULE    := SQLite
LOCAL_SRC_FILES := $(SRC_SQLITE)

TARGET_OUT=$(JNILIB_PATH)/$(TARGET_ARCH_ABI)
#TARGET_OUT=../jniLibs/$(TARGET_ARCH_ABI)

include $(BUILD_STATIC_LIBRARY)

Android Studio / Gradle错误如下：

Android NDK: ERROR:C:androidprojectsSDLTest_SQLiteappjniAndroid.mk:SQLite: LOCAL_SRC_FILES points to a missing file    
Android NDK: Check that C:/androidprojects/SDLTest_SQLite/app/jniLibs/armeabi/libSQLite.a exists  or that its path is correct   
Build command failed.

我的根本问题是我无法在任何地方生成libSQLite.a文件。我的TARGET_OUT排队问题了吗？

有人可以帮我生成我的静态库文件吗？

Here is a link to my project

答案

你不应该在Android.mk中设置TARGET_OUT：这是打破微妙的ndk构建逻辑的可靠方法。你的两个mk文件互不矛盾：SQLite既不能预先构建，也不能从源代码构建。

我不知道为什么你的错误消息说缺少SQLite源，但是你使用了不健康的完整路径。

以下是三个完成工作的mk文件：

Android.门口

ROOT_PATH   := $(call my-dir)

include $(ROOT_PATH)/src/Hello.mk
include $(ROOT_PATH)/SQLite/SQLite.mk

SQLite.门口

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

SRC_SQLITE := sqlite3.c

LOCAL_CFLAGS += -Wno-write-strings

LOCAL_MODULE    := SQLite
LOCAL_SRC_FILES := $(SRC_SQLITE)

include $(BUILD_STATIC_LIBRARY)

hello.门口

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libSDL2
LOCAL_SRC_FILES := ../../jniLibs/SDL2-prebuilt/$(TARGET_ARCH_ABI)/libSDL2.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := main

SDL_PATH := $(LOCAL_PATH)/../../jniLibs/SDL2-prebuilt

LOCAL_C_INCLUDES := $(SDL_PATH)/include

# Add your application source files here...
LOCAL_SRC_FILES := 52_hello_mobile.cpp
LOCAL_STATIC_LIBRARIES := libSDL2 SQLite
LOCAL_LDLIBS := -lGLESv1_CM -lGLESv2 -llog

include $(BUILD_SHARED_LIBRARY)

后者可以稍微改善一下：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := libSDL2
LOCAL_SRC_FILES := ../../jniLibs/SDL2-prebuilt/$(TARGET_ARCH_ABI)/libSDL2.so
SDL_PATH := $(LOCAL_PATH)/../../jniLibs/SDL2-prebuilt
LOCAL_EXPORT_C_INCLUDES := $(SDL_PATH)/include

include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)

LOCAL_MODULE := main

# Add your application source files here...
LOCAL_SRC_FILES := 52_hello_mobile.cpp
LOCAL_STATIC_LIBRARIES := libSDL2 SQLite
LOCAL_LDLIBS := -lGLESv1_CM -lGLESv2 -llog

include $(BUILD_SHARED_LIBRARY)

还有一个狐狸你的设置：你不能用APP_PLATFORM=14构建64位版本。您应该使用至少21的compileSdkVersion，并且不要显式设置APP_PLATFORM。然后，gradle将根据minSdkVersion为32位目标（即APP_PLATFORM）自动设置android-14，并将其推送到android-21以获得64位目标。

在Application.mk中，qazxsw poi设置被默默忽略。