Android APK 在32bit 和64bit 的区别问题

Android APK 在32bit 和64bit 的区别问题

目前64bitandroid系统也慢慢的多了，看到也有apk声称支持64bitsystem，然后就往里面打包搞了个arm64-v8a 目录，放了个64bit的so，但是apk代码里面却不按规范去load so ，导致一系列 file not found 异常。

apk lib目录:

先看下apk中的lib打包的目录：

依次代表不同类型的cpu

PMS安装路径：//blog.csdn.net/sergeycao

pms install 流程比较繁杂，只关注so相关的scanPackageDirtyLI函数中：

private PackageParser.Package scanPackageDirtyLI(PackageParser.Package pkg, int parseFlags,
            int scanFlags, long currentTime, UserHandle user) throws PackageManagerException {
            ...
             //invoke installer to do the actual installation  //作为外部apk 创建data目录相关项
             //\frameworks\native\cmds\installd\commands.c  install()中创建
                int ret = **createDataDirsLI**(pkgName, pkg.applicationInfo.uid,
                                           pkg.applicationInfo.seinfo);
            ...
    if (isSystemApp(pkg) && !isUpdatedSystemApp(pkg)) {
        ...

           setBundledAppAbisAndRoots(pkg, pkgSetting);

            ...

           setNativeLibraryPaths(pkg);  

    }
    else
    {
    setNativeLibraryPaths(pkg);
    ...
        if (isAsec) {
                        copyRet = NativeLibraryHelper.findSupportedAbi(handle, abiList);
                    } else {
                        copyRet = NativeLibraryHelper.copyNativeBinariesForSupportedAbi(handle,
                                nativeLibraryRoot, abiList, useIsaSpecificSubdirs);
                    }
    setNativeLibraryPaths(pkg);
      if (DEBUG_INSTALL) Slog.i(TAG, "Linking native library dir for " + path);
            final int[] userIds = sUserManager.getUserIds();
            synchronized (mInstallLock) {
                // Create a native library symlink only if we have native libraries
                // and if the native libraries are 32 bit libraries. We do not provide
                // this symlink for 64 bit libraries.
                if (pkg.applicationInfo.primaryCpuAbi != null &&
                        **!VMRuntime.is64BitAbi(pkg.applicationInfo.primaryCpuAbi)**) {
                    final String nativeLibPath = pkg.applicationInfo.nativeLibraryDir;
                    for (int userId : userIds) {
if (mInstaller.linkNativeLibraryDirectory(pkg.packageName, nativeLibPath, userId) < 0)    {
                            throw new PackageManagerException(INSTALL_FAILED_INTERNAL_ERROR,
                                    "Failed linking native library dir (user=" + userId + ")");
                        }
                    }
                }
            }

    }
}

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