我尝试访问我的文件夹在SD卡并安装myapp.apk，我用这个code：

I try to access to my folder in sdcard and install myapp.apk, i use this code:

 Runtime.getRuntime().exec("cd sdcard/.yasmin");
 Runtime.getRuntime().exec("adb install tefli.apk");

但可惜的是，我有这个错误：

But unfortunatelly i have this error:

05-11 11:09:57.925: WARN/System.err(1399): java.io.IOException: 
Error running exec(). Commands: [cd, sdcard/.yasmin] Working Directory: null    Environment: null

请任何人有一个想法。 在此先感谢。

Anybody please have an idea. thanks in advance.

推荐答案

我不知道，这将解决您的问题，但AFAIK，每次调用 EXEC（）创建一个新的外壳。一个可能的解决方案是做到以下几点：

I am not sure that this will fix your problem, but AFAIK, each call to exec() creates a new shell. A possible solution is to do the following:

也注意到，您试图访问的SD卡作为你的根文件夹，并在硬codeD路径，考虑以下几点：

also note that you are trying to access the sdcard as you were in root folder and in a hardcoded path, consider the following:

Process p = Runtime.getRuntime().exec("cd /sdcard/.yasmin");

甚至更好：

Process p = Runtime.getRuntime().exec("cd " + Environment.getExternalStorageDirectory() + "/.yasmin");

希望能对大家有所帮助！

Hope it'll help!