android 打开("/dev/input/event1", O_RDWR);权限被拒绝?

android open("/dev/input/event1", O_RDWR); with permission denied?

我想将触摸屏事件写入“/dev/input/event1”,但它运行 'open("/dev/input/event1", O_RDWR);' 需要 denied.My phone 权限 phone 已经 root,我用代码获取了 root :

String apkRoot="chmod 777 "+getPackageCodePath();
    RootCommand(apkRoot);

public static boolean RootCommand(String command)
{
    Process process = null;
    DataOutputStream os = null;
    try
    {
        process = Runtime.getRuntime().exec("su");
        os = new DataOutputStream(process.getOutputStream());
        os.writeBytes(command + "\n");
        os.writeBytes("exit\n");
        os.flush();
        process.waitFor();
    } catch (Exception e)
    {
        Log.d("*** DEBUG ***", "ROOT REE" + e.getMessage());
        return false;
    } finally
    {
        try
        {
            if (os != null)
            {
                os.close();
            }
            process.destroy();
        } catch (Exception e)
        {
        }
    }
    Log.d("*** DEBUG ***", "Root SUC ");
    return true;
}

显示我的应用确实获得了root权限,但我对'permission denied'感到困惑。

我添加代码

apkRoot="chmod 777 /dev/input/event1";
RootCommand(apkRoot);"

而且效果很好。