[android] unsigned APK can not be installed

I did not know that even with the "Allow Installation of non-Marked application", I still needed to sign the application.

I self-signed my application, following this link self-sign and release application, It only took 5 minutes, then I emailed the signed-APK file to myself and downloaded it to SD-card and then installed it without any problem.

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Application Installation Failed in Android Studio Difference between signature versions - V1 (Jar Signature) and V2 (Full APK Signature) while generating a signed APK in Android Studio? Session 'app': Error Installing APK Android Error Building Signed APK: keystore.jks not found for signing config 'externalOverride' Build and Install unsigned apk on device without the development server? The APK file does not exist on disk Android Studio: Application Installation Failed How to retrieve Key Alias and Key Password for signed APK in android studio(migrated from Eclipse) ADB Install Fails With INSTALL_FAILED_TEST_ONLY Upload failed You need to use a different version code for your APK because you already have one with version code 2

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