如何减少需要openCv lib(仅用于图像处理)的Android应用的apk大小 [英] How to reduce the apk size of Android app which need openCv lib( only for Image processing)

问题描述

我正在使用最小的SDK 15构建一个Android应用，该SDK使用OpenCV库.问题是当我构建的apk大小大于60 MB时，这不是很好.

I'm building an Android app with min SDK 15, which uses OpenCV library.The problem is when I build apk size of it is more than 60 MB which is not very great.

我检查了应用程序文件，由于amr64，armeabi，mips，x86等所有体系结构中的libopencv_java3.so文件，我发现大小太大.

I checked the app file, I could see that the size is too big due to libopencv_java3.so file in all architectures like amr64, armeabi, mips, x86 etc.

我仅使用opneCv进行图像处理.该库还具有许多其他功能，例如视频处理，3d图像，对象检测等，而我的应用程序中不需要

I am using opneCv only for image processing.This library has a lot of other features like video processing, 3d image, object detection and much more, which I don't need in my app like

如果我删除所有这些文件并构建APK，则大小将减少50 MB，但是要使该应用程序正常运行，我需要安装OpenCVManager才能运行我的应用程序.

If I remove all those files and build APK, then size will be reduced 50 MB, but to make this app work I need to install OpenCVManager to run my app.

有什么方法可以减小我的apk大小?

Is there any way by which I can reduce my apk size?

或者仅从我感兴趣的OpenCV中提取功能并为这些功能创建.so是有可能的吗?

Or is it possible just to extract only the feature from OpenCV which I am interested in and create .so for those features?

推荐答案

对我来说， alijandro答案第二个答案是最佳解决方案，但我陷入了这一过程.所以，我通过apk split解决了这个问题.您需要上传与该平台相关的apk以及一个通用apk.这很理想，因为OpenCV在模块级别不提供添加的依赖关系.

For me, alijandro answer 2nd answer was the best solution but I got stuck in the process. So, I solved the issue by apk split. You need to upload apk's related to the platform and also a universal apk.It would be ideal , since OpenCV doesn't provide adding dependency at module level.

万一apk将在平台不匹配的情况下下载. 此处 是写得很好的博客，内容涉及apk发布多个apk.您需要维护相同的应用程序ID，密钥库，相同的应用程序版本但不同的代码版本

Universal apk will be downloaded in case platform does not match.Here is nicely written blog about apk publishing mutiple apk. You need to maintain same app id , Keystore, same app version but different code version

第1步.添加用于spk拆分的gradle代码.包括要为其创建单独的APK的体系结构.

Step 1.Add gradle code for spk split. Include the architecture for which you want to create separate apk.

android{
//......
splits {
    abi {
        enable true
        reset()
        include "armeabi","armeabi-v7a",'arm64-v8a',"mips","x86","x86_64",'arm64-v8a'
        universalApk true
    }
}
}

第2步.为不同平台的不同代码版本添加以下代码.

Step 2.Add below code for different Code version for different platform.

android{
//......
}
ext.versionCodes = ['armeabi': 3, 'armeabi-v7a': 4, 'arm64-v8a': 5, 
mips: 6, 'x86': 7, 'x86_64': 8]
import com.android.build.OutputFile
// For each APK output variant, override versionCode with a combination 
// of ABI APK value * 1000 + defaultConfig.versionCode
android.applicationVariants.all { variant ->
// assign different version code for each output
variant.outputs.each { output ->
    def abiFilter = output.getFilter(OutputFile.ABI)
    def abiMultiplier = 0
    if (abiFilter != null) {
        abiMultiplier = project.ext.versionCodes.get(abiFilter)
    }
    output.versionCodeOverride =
            abiMultiplier * 1000 + android.defaultConfig.versionCode
   }
  }

例如，如果初始版本代码为1，则生成的代码将为:

For Example, if the initial version code was 1, then generated codes will be:

 armeabi -> 3001
 armeabi-v7a -> 4001
 arm64-v8a -> 5001
 mips -> 6001
 x86 -> 7001
 x86_64 -> 8001

所有的Gradle代码都将像这样.

All together your Gradle code will look like this.

 android{
//......
splits {
abi {
    enable true
    reset()
    include "armeabi","armeabi-v7a",'arm64-
v8a',"mips","x86","x86_64",'arm64-v8a'
    universalApk true
 }
 }

 ext.versionCodes = ['armeabi': 3, 'armeabi-v7a': 4, 'arm64-v8a': 5, 
mips: 6, 'x86': 7, 'x86_64': 8]
import com.android.build.OutputFile
android.applicationVariants.all { variant ->
variant.outputs.each { output ->
def abiFilter = output.getFilter(OutputFile.ABI)
def abiMultiplier = 0
if (abiFilter != null) {
    abiMultiplier = project.ext.versionCodes.get(abiFilter)
}
output.versionCodeOverride =
        abiMultiplier * 1000 + android.defaultConfig.versionCode
}
}

现在，您需要将所有apk一次发布在playstore上.

Now you need to publish all the apk on playstore one by one.

注意:发布时请确保保留所有平台和通用apk.

Note: While publishing make sure you retain all the platform and universal apk.

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