修改系统文件权限 [英] Changing system file permission

问题描述

我真的什么都试过了：

• <一个href="https://nethack-android.google$c$c.com/svn-history/r430/trunk/slashem-0.0.7E7F3/sys/android/NetHackApp/src/com/slashemff/NetHackFileHelpers.java"相对=nofollow> NetHackFileHelpers
• <一个href="http://stackoverflow.com/questions/11408154/how-to-get-file-permission-mode-programmatically-in-java">How获取文件权限模式编程在Java中
• 更改文件权限
• <一个href="http://stackoverflow.com/questions/7129144/mount-r-w-system-in-android-application-to-edit-read-only-files">Mount在Android应用程序来编辑R / W系统只读文件

• NetHackFileHelpers
• How to get File Permission Mode programmatically in Java
• Change file permission in application
• Mount R/W system in android application to edit Read Only files

现在，假设我已经重新安装的根，因此 RW​​ 文件系统（Android版本2.3.7）的权限：

Now, suppose I've remounted as root, and therefore RW permission on file system (Android version 2.3.7):

Process process = Runtime.getRuntime().exec("su");
        DataOutputStream os = new DataOutputStream(process.getOutputStream());
        os.writeBytes("chmod -c 0777 /system/etc/customization/settings/com/android/browser/custom_settings.xml\n");
        os.writeBytes("exit\n");
        os.flush();
        process.waitFor();

或

Process process = Runtime.getRuntime().exec("su -c \"/system/etc/customization/settings/com/android/browser/custom_settings.xml\"");

或

Class<?> fileUtils = Class.forName("android.os.FileUtils");
            Method setPermissions =
                fileUtils.getMethod("setPermissions", String.class, int.class, int.class, int.class);
            int a = (Integer) setPermissions.invoke(null, "/system/etc/customization/settings/com/android/browser/custom_settings.xml", 0777, -1, -1);

的行为是一样的：没有任何反应。而如果我搭配chmod 亚行的shell工作正常。我怎样才能从我的code更改该文件的权限？

The behaviour is the same: nothing happens. Whereas if I chmod from adb shell works fine. How can I change the permissions of that file from within my code?

推荐答案

下面是我的解决办法：

        Process sh = Runtime.getRuntime().exec("su", null, new File("/system/bin/"));
        OutputStream os = sh.getOutputStream();

        os.write(("chmod 777 <filepath>").getBytes("ASCII"));
        os.flush();
        os.close();
        sh.waitFor();

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