转自：http://sunzeduo.blog.51cto.com/2758509/1279335/
root过了手机，发现再次安装程序出现了 Installation failed due to invalid APK file
这样的错误，后来再看logcat 发现是
Unable to open zip '/data/local/tmp/QuanZi.apk': Permission denied
这样的原因，但是将data/local/tmp 的权限修改了发现还是不行，最后通过查找，发现使用软连接的方式，将/data/local/tmp 到 /mnt/sdcard/tmp 这个下面，发现就可以了，也就是以后我的这个手机程序的安装都首先要在sdcard下安装了
ln -s /mnt/sdcard/tmp /data/local/tmp 下面的查找的资料
I got exactly the same problem, and this solution fixed it, so i hope it does for you too.
The reason for "permission denied" is that apk files uploaded to /data/local/tmp had to low permissions, and the installer process obviously did not have permissions to read any such file.
I never found a solution, but have a workaround that satisfies me. I have simply moved/symlinked the tmp directory to the SD card. Since SD card is formatted as FAT, it does not have owners/permissions and all files created there are always readable by everyone. So open a terminal emulator on your phone. Get root ("su") and type in:
# cd /data/local
# mv tmp tmp-old # (or simply rm -rf tmp)
# mkdir /mnt/sdcard/tmp
# ln -s /mnt/sdcard/tmp ./tmp