android su后执行命令

    /**
     * 执行Android命令
     *
     * @param cmd 命令
     */
    public static void execSuCmd(String cmd) {
        Process process = null;
        DataOutputStream os = null;
        DataInputStream is = null;
        try {
            process = Runtime.getRuntime().exec("su");
            os = new DataOutputStream(process.getOutputStream());
            os.writeBytes(cmd + "\n");
            os.writeBytes("exit\n");
            os.flush();
            int aa = process.waitFor();
            is = new DataInputStream(process.getInputStream());
            byte[] buffer = new byte[is.available()];
            is.read(buffer);
            String out = new String(buffer);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (is != null) {
                    is.close();
                }
                if (process != null) {
                    process.destroy();
                }

            } catch (Exception e) {
            }
        }
    }

比如：

util.execSuCmd("echo 0 > /sys/class/gpio/gpio44/value");