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又变了。。。
https://android.googlesource/platform/frameworks/base/+/refs/tags/android-platform-11.0.0_r7/services/core/java/com/android/server/pm/PackageManagerService.java#16016

/**
     * Given {@code targetDir}, returns {@code targetDir/~~[randomStrA]/[packageName]-[randomStrB].}
     * Makes sure that {@code targetDir/~~[randomStrA]} directory doesn't exist.
     * Notice that this method doesn't actually create any directory.
     *
     * @param targetDir Directory that is two-levels up from the result directory.
     * @param packageName Name of the package whose code files are to be installed under the result
     *                    directory.
     * @return File object for the directory that should hold the code files of {@code packageName}.
     */
    private File getNextCodePath(File targetDir, String packageName) {
        SecureRandom random = new SecureRandom();
        byte[] bytes = new byte[16];
        File firstLevelDir;
        do {
            random.nextBytes(bytes);
            String dirName = RANDOM_DIR_PREFIX
                    + Base64.encodeToString(bytes, Base64.URL_SAFE | Base64.NO_WRAP);
            firstLevelDir = new File(targetDir, dirName);
        } while (firstLevelDir.exists());
        random.nextBytes(bytes);
        String suffix = Base64.encodeToString(bytes, Base64.URL_SAFE | Base64.NO_WRAP);
        return new File(firstLevelDir, packageName + "-" + suffix);
    }

变为先在/data/app/目录下创建随机的目录，

/data/app/~~Hla4zz56jaUwsb44fhZDmg==/pkg-dpjGrfyX2aVwmhQt_Yg2Kw==/base.apk

前后都加了前缀，不确定为什么这么做，难道有什么绕过随机后缀的方式得到路径，不然为什么还非要再加个前缀，当然肯定是更安全了。

本文标签： 安装目录

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