App not installed when installing from apk

If you are encountering this issue, maybe you try these following methods:

1. Apk was built without keystore

This case will cause some strange behaviour, I tested with two devices:

On Asus zenfone 6 with android 6.0.1, it will show “App not installed”.

On Samsung galaxy tab E with android 4.4, it allows you install, but when you restart the device, the app will be removed (exactly app still in Application manager at Settings, but the size is 0.00B)

2. Storage was full

If your disk is available about 100Mb and your app has a size just 50Mb, maybe the system will not install the app success, I used to stuck in this case and spent few hours just to realize that my disk is not enough space. So please check your disk to make sure that available space is larger than the size app at least 3 times.

3. Google Play Protect is enabled

It’s not happening at all device (I don’t know exactly what thing cause this issue, maybe by device or Android OS version) but you can disable Google Play Protect to solve the issue.

4. An existing version app was installed from Google Play

If you publish your app to Google Play and the device was installed. Then you install another version from apk, the system doesn’t allow you do this thing (override just can be done if the previous was installed from apk too).

So remember to check existing app before installing the new from apk.

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