缺少创建新AS项目并在安装时在我的设备上填充lib文件夹的步骤 [英] Missing step to create a new AS project and get a lib folder populated on my device upon installation

问题描述

目标

我希望安装APK时，可以从固定位置在设备上使用APK中存在的库.

根据我现有的项目，我打开了关于此问题的另一个问题 .这次，我从头开始了一个全新的项目，以减少未知数并使问题更易于解决.

我遵循的步骤

对于Android Studio 4.0.1，我可以执行以下操作:

• 开始一个新的Android Studio项目

• 选择本机C ++

• 设置项目名称以进行测试

• 选择Java作为语言

• 使用默认工具链

• 构建->制作项目

在项目视图下，我确认我的app-debug.apk有一个lib文件夹，其中包含几个子目录，每个子目录至少具有根据默认CMakeLists.txt规则为此项目构建的libnative-lib.so. /p>

我希望在安装APK时可以从设备访问此.so(我有一个更复杂的项目，在其中创建.so，以便可以从APK外部访问).

但是，当我运行时，从我的项目文件夹中:

c:\Users\xxx\AndroidStudioProjects\test>adb install app\build\outputs\apk\debug\app-debug.apk
Performing Streamed Install
Success

c:\Users\xxx\AndroidStudioProjects\test>adb shell ls /data/data/com.example.test
cache
code_cache

我尝试过的其他更改

以下任何进一步的更改都不允许我在/data/data/com.example.test

下查看其他文件

• 将android.bundle.enableUncompressedNativeLibs=false添加到gradle.properties

• 已添加

  android {
      ...
      sourceSets.main {
          jniLibs.srcDirs = ['libs']
          jni.srcDirs = []
      }
  

  到build.gradle对此没有任何更改.

• 将set(distribution_DIR ${CMAKE_SOURCE_DIR}/libs)添加到CMakeLists.txt

解决方案

本机库不是放置在/data/data/your.app中，而是放置在/data/app/your.aapp-<key-hash>==/lib/<ABI>中，例如在我的目标上:

hikey960:/ # cd /data/app/com.example.dlopen-6BSPeAN9VvjFlCxIzLHX9A\=\=/lib/arm64                                                                                     
hikey960:/data/app/com.example.dlopen-6BSPeAN9VvjFlCxIzLHX9A==/lib/arm64 # ls -als
total 1352
   4 drwxr-xr-x 2 system system    4096 2020-11-06 12:43 .
   4 drwxr-xr-x 3 system system    4096 2020-11-06 12:43 ..
1044 -rwxr-xr-x 1 system system 1067256 1981-01-01 01:01 libnative-lib.so
 300 -rwxr-xr-x 1 system system  305360 1981-01-01 01:01 libplugin.so

默认情况下，本机库也已存档且不可访问，要提取它们，需要在AndroidManifest.xml中设置android:extractNativeLibs="true"(例如，如下所示:another question about this issue based on my existing project. This time, I started a brand new project from scratch in order to reduce the unknowns and make my question simpler to resolve.

Steps I followed

With Android Studio 4.0.1, I do the following:

• Start a new Android Studio project

• Select Native C++

• Set project name to test

• Select Java as language

• Use default toolchain

• Build -> Make Project

Under the project view, I verify that my app-debug.apk has a lib folder containing a few subdirectories, each with at least the libnative-lib.so that was built for this project accordingly to the default CMakeLists.txt rules.

I would like this .so to be accessible from my device when I install my APK (I have a more complex project in which I create .so that I want accessible from outside the APK).

However, from my project folder, when I run:

c:\Users\xxx\AndroidStudioProjects\test>adb install app\build\outputs\apk\debug\app-debug.apk
Performing Streamed Install
Success

c:\Users\xxx\AndroidStudioProjects\test>adb shell ls /data/data/com.example.test
cache
code_cache

Other changes I tried

None of the following further changes allowed me to see additional files under /data/data/com.example.test

• Added android.bundle.enableUncompressedNativeLibs=false to gradle.properties

• Added

  android {
      ...
      sourceSets.main {
          jniLibs.srcDirs = ['libs']
          jni.srcDirs = []
      }
  

  to build.gradle do not change anything to this.

• Added set(distribution_DIR ${CMAKE_SOURCE_DIR}/libs) to CMakeLists.txt

解决方案

Native libraries are not placed in /data/data/your.app but in /data/app/your.aapp-<key-hash>==/lib/<ABI>, for example on my target:

hikey960:/ # cd /data/app/com.example.dlopen-6BSPeAN9VvjFlCxIzLHX9A\=\=/lib/arm64                                                                                     
hikey960:/data/app/com.example.dlopen-6BSPeAN9VvjFlCxIzLHX9A==/lib/arm64 # ls -als
total 1352
   4 drwxr-xr-x 2 system system    4096 2020-11-06 12:43 .
   4 drwxr-xr-x 3 system system    4096 2020-11-06 12:43 ..
1044 -rwxr-xr-x 1 system system 1067256 1981-01-01 01:01 libnative-lib.so
 300 -rwxr-xr-x 1 system system  305360 1981-01-01 01:01 libplugin.so

Also native libraries are archived by default and can not be accessible, for extracting them it is needed to set android:extractNativeLibs="true" in AndroidManifest.xml (for example like here: https://github.com/nkh-lab/ndk-dlopen/blob/master/dlopen/app/src/main/AndroidManifest.xml).

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