Update. I was able to recover my bits with the help of Dave at https://walletrecoveryservices.com/. It cost me 20% but I recovered the forks BCH BSV and BTG which I didn't know about,  so that took out some of the sting.
In the end I did have the correct password/keys but it just didn't work with the old outdated Android wallet.
Much thanks to those who tried to help me out.

Here's something else.  In my Android bitcoin wallet (which is also the device where the (bitcoin-wallet-keys-date) have been stored and moved to one or two new phones over time I get this message with the keys. "password encrypted, external storage manually backed up on May 15". Does not say what year so can only assume this is a recent date. This android wallet is not password protected and the hard drive only has a phone entry password. So really stumped by this.
Edit: I have found that the reason these files have a date on them is because I opened them in Notepad and/or ++ so they are modified. But they are not encrypted so I don't know why Schildbach is saying they are encrypted. Can't try without a password because the restore button is greyed out.
Edit: I keep learning a little more.  In looks like the file(s) are indeed encrypted but I don't have a password.

Still no luck. To restore the Schildbach wallet is really simple.. Safety > Restore > pick a file and password. I have the b/u files (2). Back in 2014 I pretty much only used one password for everything but it doesn't work. Just thought I'd let you know. Still trying though. Bitcoin keeps going UP.

Just one other thing.. those 2 Multibit Schildbach backups I did in 2014 with the name of "bitcoin-wallet-keys-2014-02-03" 240 bytes. They are plain text files that contain about 350 characters. They must have expected owners to be able to use these files for recovery but there is not much reference to them on the web except other persons wondering the same thing. 

When I create a new wallet and import the key..  it generates a new address and of course there is nothing in it.

When I create a new wallet and import my good address (watching-only).. it won't let me import the key, only sweep and then there are no inputs.

I starting to wonder..  when I backed up my wallet back in 2014 onto a thumb drive where the key is, I'm now thinking it was an empty wallet - not knowing what I was doing.

I think my only recourse is to gain entry into the original device - Asus Android Tablet which is locked.

I really want to thank you for your steadfast support on this issue. I wish I had some btcs to send you.  Maybe later.

Still wondering about that key..  it just didn't come out of nowhere

"The 175 char key you keep talking about is likely not a "key" but (encrypted) text in a .key file right?" Yes that's right.

Electrum looks like it's ready to send except that it's a (watching-only) wallet. I don't have the option to import the key.. just "sweep" and that results in a no input message.  The lock icon on the bottom right is in the "locked" status.

HCP -  In Electrum the six entries in the Amount column are Black in colour. The balance in the lower left corner is 350. mBTC
Yes, in the Output boxes I do have several change addresses. At this point I have 2 keys. The original with about 50-51 characters. The exported one with about 175 char.

Also I have these other 2 options.
1 - I have a schildbach plain text backup from 2014. Does anyone know how to use this in Multibit classic or other wallet?
2 - I still have the device I used when I traded these btcs. It's an Asus Android Tablet. After it sitting around for 5 years I exhausted the pattern attempts to gain entry. My gmail/pass don't work, my device is no longer listed in my google device list, have tried calling Google but that's like trying to reach god himself. Of course wifi is disconnected and can't gain entry to turn it on.
All replies will be greatly appreciated.

HCP. "You used your "recovered" password to import key(s) from the old .key file? Is that correct?" Yes that is correct. The imported file had only 1 (one) key.
From the main address (starts with a 1) and under the History Tab in Electrum there are six imputs with green checkmarks in front of the date. When I click on one of these they reveal quite a lot of other information. Would the "change address be in there?
I noticed that the original key, that I exported in Multi, now has a long string of char's about 175. The new exported key has about 50 char starts with K.
I keep trying to learn more.

My address and and the six purchases associated with it are definitely there. It's just that I don't know how to mate the two. Address and key.

Never trust your memory!  I had my password in a safe place and for further protection I left out 3 digits. Thought I would remember because it was similar to one I used frequently. But not so..  tried for many months until I found the password associated with another program. Eureka!

Now I'm trying to mate the key with the address in Electrum but not much luck. Yes HCP, the address starts with a 1 (one) and the key with a K says Base 58.
When I try to sweep says no input even with p2pkh as a prefix. My address is in there as receiving and watch-only. Think I need to open a new wallet from old Multibit files but not working out. If I use dot wallet - says can' read. Not sure where to go from here.

Thanks so much for your help so far.

I have found a copy of my password I now need to export it out of Multibit and into a supported wallet. Will report when done. Thank you for the replies.

It's asking me for a wallet password in addition to the key password. I only have one password and can't unlock the key file. Do I need two passwords? I notice your foo wallet in your instructions doesn't have a password.

Yes yes.. I was able to open the file in notepad++ and the plain text starts with U2FsdGVkX. Encouraging. What do I do with it now?  Thanks thanks.

Thanks gents for the comments.. I'm still working on it. The multibit wallet that  I downloaded (v0.5.19) is not accepting my bitcoin password. Anu1908.. yes my bits are still at my address. The Android tablet did have a Multibit wallet..  thinking around 2014-15.
If I could just talk to google maybe I could recover my device password but my device is no longer visible in google accounts recovery. If I remember correctly I was able to trade bitcoin with that tablet just by scanning the the other party's QR code without entering any password.
Thanks again

Greetings Ladies, Gents

I purchased some bitcoin a few years ago using Multibit on a Android Tab. I no longer have access to that tablet. This is what I have.
A Bitcoin address verifiable on Blockchain Explorer.
A backup file that looks like this: bitcoin-wallet-keys-date-bytes but seems to have a null ext.
Also have a file called: date6othernumbers.key.

My question is, since Multibit is no longer supported, what wallet would give me the best chance of recovery.

Pretty much a newbie at this so any/all help would be greatly appreciated.

Thanks