Android 获取SD卡路径和判断SD卡是否存在

public String getSDPath(){
File sdDir = null;
boolean sdCardExist = Environment.getExternalStorageState()
.equals(android.os.Environment.MEDIA_MOUNTED); //判断sd卡是否存在
if (sdCardExist)
{
sdDir = Environment.getExternalStorageDirectory();//获取跟目录
}
return sdDir.toString();
}

if (android.os.Environment.getExternalStorageState().equals(
　　android.os.Environment.MEDIA_MOUNTED))
{
//TODO:
}