Where are you installing the app? are you doing it on the emulator or
a real device? If it is a real device you can do that with out
creating an unsigned package directly through eclipse. Otherwise you
will need to sign it to install on the device as a proper app.

And the image you have included seem to have lot of Java errors. It is
not clear from the image what they are. You have to debug them or show
someone that is close by to you to take a look.

http://satyakomatineni.com/android/training
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http://androidbook.com
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On Sun, Aug 12, 2012 at 10:36 AM, EeLeng Tee <marcusel...@gmail.com> wrote:
> Hello..
> Im new to eclipse.
> I've tried to play with android sample project from SDK.
> I export any project to unsigned apk file and install it
> But comes out "App not installed" message.
> Everything looks fine but just cant be installed.
> Anyone help? Thanks
>
> Oh ya i also encountered this problem which is java problem shown.
>
> http://i50.tinypic.com/r7rdkz.png
>
> Hope you guys can help because its important for my final year project =)
>
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