Android

Issues with sign in key...

When attempting to upload a APK package, I'm getting the following response

Only a month ago, running an app through the Android Studio emulator was running fine.  Now I'm warmly greeted by

Error
Installation did not succeed.
The application could not be installed: INSTALL_PARSE_FAILED_NO_CERTIFICATES

The complete error is 

Warning from Google Play Store when uploading an App

Uploading a new version of an Android app to Google Play and I'm seeing this error

Version code 1 has already been used. Try another version code.

There are three areas to observe:

Version Code: {whole integer}
Version Name: {String}
Version Name Suffix: {Integer}

Currently, my settings are:

Whilst uploading a new version of our Android app, I had the following error display

The Android App Bundle was not signed.

The short answer is in the build type release debuggable isn't set to false.

How to solve

In the build.gradle file (path: android > app)

If you have a situation where either you have forgotten a Keystore password or change of developers and the password wasn't sent across.... what to do?  However, your app lives on and needs to be updated!

What I'm seeing in Android Studio when attempting to run the emulator?

Android Studio error

Android Studio error

error: package android.support.v4.content does not exist

This is a problem with plugins using old Android support dependencies instead of the AndroidX equivalent.  As it's a dependency issue, to resolve add jetifier.  I know yet another package...

Android Studio build errors

Build failed error: cannot find symbol if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R)

or

cannot find symbol Build.VERSION.SDK_INT >= Build.VERSION_CODES.S &&

To resolve - upgrade the compileSdkVersion and targetSdkVersion to 31 in your grade file.  Note, this setting could be in one of the following files