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Why APK won't install on Android? First, make sure that your Android version supports the APK version you want to install. Also, remove the Play Store version of the app before installing an APK. Don't forget to check the storage space and permission to install apps from unknown sources.
Usually that happens because you have files left over from a previous version or download, or if the apk is incompatible with your phone, either the model or version of android and so the installation keeps failing.
Tap on the Security option. Scroll down until you see Unknown sources and check the box. Open your file browser and navigate to your download folder where the APK is. Tap the APK and follow the instructions to install the app.
Try changing the ADB connection timeout. I think it defaults that to 5000ms and I changed mine to 10000ms to get rid of that problem.
If you are in Eclipse, you can do this by going through
Window -> Preferences -> Android -> DDMS -> ADB Connection Timeout (ms)
What I usually do when I get this error is restarting the adb server by typing in the cmd:
adb kill-server
adb start-server
EDIT: With some never versions of the Platform Tools you can do this from the DDMS Perspective in the Devices Tab menu (near the Capture Button), click on Reset adb.
EDIT2: Also I found out that it is preferable to use the USB port in the back of your PC, since most of the front USB ports are low powered, and really seem to be slower when uploading apks on your devices.
I used to have this problem sometimes, the solution was to change the USB cable to a new one
don't use USB 3.0 ports for connection beetwen PC and Android phone!
USB 3.0 - Port with blue tongue
USB 2.0 - Port with black tongue
Reboot the phone.
Seriously! Completely power down and power up. That fixed it for me.
I have encountered the same problem and tried to change the ADB connection timeout. That did not work. I switched between my PC's USB ports (front -> back) and it fixed the problem!!!
I get this a lot. I'm on a Galaxy S too. I unplug the cable from the phone, plug it back in and try launching the app again from Eclipse, and it usually does the trick. Eclipse seems to lose the connection to the phone occasionally but this seems to kick it back to life.
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