Android调用Linux命令修改文件权限的两种实现方式

第一种：

public class FileMode {

    public static void changeFileModeByCmd(String file) {

        String[] command = {"chmod", "777", file};//777代表可读写可执行，666代表可读写不可执行

        ProcessBuilder builder = new ProcessBuilder(command);

        try {

            builder.start();

        } catch (IOException e) {

            e.printStackTrace();

        }

    }

第二种：

public static void changeFileModeBySys(String filename) {

        try {

            Process p = Runtime.getRuntime().exec("chmod 644 " + filename);

            int status = p.waitFor();

            if (status == 0) {

                //chmod succeed

            } else {

                //chmod failed

            }

        } catch (IOException | InterruptedException e) {

            e.printStackTrace();

        }

    }

}