Andriod判断手机是否root

Checks if the device is rooted.
判断手机是否被root

   /**
     * Checks if the device is rooted.
     *
     * @return <code>true</code> if the device is rooted, <code>false</code> otherwise.
     */
    public static boolean isRooted() {

        // get from build info
        String buildTags = android.os.Build.TAGS;
        if (buildTags != null && buildTags.contains("test-keys")) {
            return true;
        }

        // check if /system/app/Superuser.apk is present
        try {
            File file = new File("/system/app/Superuser.apk");
            if (file.exists()) {
                return true;
            }
        } catch (Exception e1) {
            // ignore
        }

        // try executing commands
        return canExecuteCommand("/system/xbin/which su")
                || canExecuteCommand("/system/bin/which su") || canExecuteCommand("which su")
                || canExecuteCommand("busybox which su");
    }

    // executes a command on the system
    private static boolean canExecuteCommand(String command) {
        Process process = null;
        try {
            process = Runtime.getRuntime().exec(command);
            BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String info = in.readLine();
            if (info != null) return true;
            return false;
        } catch (Exception e) {
            //do noting
        } finally {
            if (process != null) process.destroy();
        }
        return false;
    }