Application from Android Studio won't install from signed APK, does installs fine over ADB -

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i'm having problem installing application on phone, , other phones, it's apk. when load application android studio's run button on adb, installs fine no issues, when generate signed apk , sideload onto device (both debug , release), throws error saying "app not installed."

i've genuinely looked everywhere answer can't find anything, has else came across before?

here's video of issue https://www.youtube.com/watch?v=s1ebauldrqs

here's info app. uses zxing, therefore uses phones camera, , can see video i've proper permission declared in manifest, still though measure manifest follows:

<manifest package="com.android.tighearnan.frenchsscanner"           xmlns:android="http://schemas.android.com/apk/res/android">      <uses-permission android:name="android.permission.camera"/>     <uses-permission android:name="android.permission.write_external_storage" />      <uses-feature         android:name="android.hardware.camera2"         android:required="true"/>      <uses-feature         android:name="android.hardware.camera"         android:required="false" />      <uses-feature         android:name="android.hardware.camera.autofocus"         android:required="false" />       <application         android:allowbackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:theme="@style/apptheme">         <activity             android:name=".scanneractivity"             android:label="@string/app_name">             <intent-filter>                 <action android:name="android.intent.action.main"/>                  <category android:name="android.intent.category.launcher"/>             </intent-filter>         </activity>     </application> </manifest>

just in case might think it's on stating old camera in manifest, i've tried installing without , still doesn't work.

any greatly, appreciated.

i have faced same issue, , after confirming android device run apps outside of google play store, checking build versions, cheking api versions, generating 2 different keystores(you need 1 of course), , generating signed release apk version, apk not install on device.

my "fix" restart android device. (and make sure versions of app had on device during making of app uninstalled device)

i hope helps.


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