从Android原生活动加载第三方共享库 [英] Loading 3rd party shared libraries from an Android native activity

问题描述

我已经建立了Assimp库作为共享库。我已经把它包含在我的Andr​​oid NDK项目，它建立正常，但当我打开它，我得到以下错误： 无法加载本地库：我的母语，活动

（也许我要补充一点，我的活动正常工作时，不包括图书馆和我已经检查了apk文件和设备上，该库被添加到库文件夹，并安装在设备上的/数据/数据/我的应用程序内/ lib目录下。）

我已经做了很多的阅读，似乎解决了这个唯一的办法就是他们使用的System.loadLibrary发动我的祖国活动之前加载。我想我会preFER加载它们动态地使用dlopen采取这种办法之前。

我是正确的假设机器人不会自动加载的共享库，我的祖国的活动（即我的共享库）取决于？

我将建立它作为一个静态库，但它是在54MB它无法工作。

这是我的Andr​​oid.mk： 我试着加入-lassimp到LOCAL_LDLIBS。我不知道这是正确的，但它并没有任何区别。

  LOCAL_PATH：= $（叫我-DIR）

包括$（CLEAR_VARS）
LOCAL_MODULE：= assimp
LOCAL_SRC_FILES：= libassimp.so
包括$（preBUILT_SHARED_LIBRARY）

包括$（CLEAR_VARS）
LOCAL_MODULE：=天然活性
LOCAL_SRC_FILES：= main.cpp中
LOCAL_LDLIBS：= -llog -landroid -lEGL -lGLESv2
LOCAL_STATIC_LIBRARIES：= android_native_app_glue
LOCAL_SHARED_LIBRARIES：= assimp
LOCAL_CPPFLAGS + = -march =的ARMv7-A -mfloat-ABI = softfp
LOCAL_CFLAGS：= $（LOCAL_CPPFLAGS）
TARGET_ARCH_ABI：= armeabi-V7A
LOCAL_C_INCLUDES + = $（LOCAL_PATH）
包括$（BUILD_SHARED_LIBRARY）

$（呼叫进口模块，机器人/ native_app_glue）
 

解决方案

子类android.app.NativeActivity是解决这一问题的最简单的方法。

 包com.you;

公共类MyNativeActivity扩展android.app.NativeActivity {

    静态{
       的System.loadLibrary（assimp）;
    }
 }
 

然后改变你的的Andr​​oidManifest.xml 。替换 android.app.NativeActivity 与 MyNativeActivity 键，删除标记有code = 假。

作为一个侧面说明，Android的做加载一个共享库时，搜索依赖。但是，搜索范围仅限于 /系统/ lib目录。

I've built the Assimp library as a shared library. I've included it in my Android ndk project and it builds fine but when I load it I get the following error: Unable to load native library: My-Native-Activity.

(Perhaps I should add that my activity works fine when the library is not included and that I've checked the apk and on the device; the library is being added to the libs folder and installed on the device in /data/data/my-app/lib.)

I've done a lot of reading and it seems that the only way to solve this is to load them using System.loadLibrary before launching my native activity. I think I'd prefer load them dynamically using dlopen before taking that approach.

Am I correct in assuming that Android wont automatically load the shared libraries my native activity(i.e. my shared library) depends on?

I would build it as a static library but it was over 54Mb which wont work.

This is my Android.mk: I've tried adding -lassimp to LOCAL_LDLIBS. I'm not sure if that would be correct but it didn't make any difference.

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE                        := assimp
LOCAL_SRC_FILES                     := libassimp.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE                        := native-activity
LOCAL_SRC_FILES                     := main.cpp 
LOCAL_LDLIBS                        := -llog -landroid -lEGL -lGLESv2 
LOCAL_STATIC_LIBRARIES              := android_native_app_glue
LOCAL_SHARED_LIBRARIES              := assimp
LOCAL_CPPFLAGS                      += -march=armv7-a -mfloat-abi=softfp
LOCAL_CFLAGS                := $(LOCAL_CPPFLAGS)
TARGET_ARCH_ABI                     := armeabi-v7a
LOCAL_C_INCLUDES            += $(LOCAL_PATH)
include $(BUILD_SHARED_LIBRARY)

$(call import-module,android/native_app_glue)

解决方案

Subclassing android.app.NativeActivity is the simplest way to solve this problem.

package com.you;

public class MyNativeActivity extends android.app.NativeActivity {

    static {
       System.loadLibrary("assimp");
    }
 }

Then change your AndroidManifest.xml. Replace android.app.NativeActivity with MyNativeActivity and remove the tag hasCode="false".

As a side note, Android does search for dependencies when loading a shared library. But the scope of the search is limited to /system/lib.

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