Android Question Installation/Upgrade to 10.2 Errors

[swabygw]

SDK Manager
Error: Error: Could not find or load main class com.android.sdklib.tool.sdkmanager.SdkManagerCli
Caused by: java.lang.ClassNotFoundException: com.android.sdklib.tool.sdkmanager.SdkManagerCli

AVD Manager:
Error: Error: Could not find or load main class com.android.sdklib.tool.AvdManagerCli
Caused by: java.lang.ClassNotFoundException: com.android.sdklib.tool.AvdManagerCli

I think that this error has been mentioned before, but I think my installation steps were correct. Here's what I did to accomplish the upgrade from 10.0 to 10.2.

1) Keeping existing Java, so downloaded everything in #2 and #3 here (B4A – The simple way to develop native Android apps (b4x.com)) the Android command_line_tools, the resources_9_20, the new B4A Full Version. Existing Java installation look like this:


2) Deleted my existing Android folder. Recreated a new Android folder and extracted command_line_tools and resources_9_20 into it, and it looks exactly as suggested (see image below).



3) Installed B4A and double-checked Configure Paths. It looks like this:

I had seen that 29 is the recommended version, should I go ahead and change this to 29? To check if I could download 29, I went on to the next step.

4) I'm planning on using the emulator, so I opened the SDK Manager to see what was installed and go the error mentioned above.
Error: Error: Could not find or load main class com.android.sdklib.tool.sdkmanager.SdkManagerCli
Caused by: java.lang.ClassNotFoundException: com.android.sdklib.tool.sdkmanager.SdkManagerCli

5) Clicking on the AVD Manager button within the SDK Manager popup yields the following error, too:
Error: Error: Could not find or load main class com.android.sdklib.tool.AvdManagerCli
Caused by: java.lang.ClassNotFoundException: com.android.sdklib.tool.AvdManagerCli

 

[MikeSW17]

1) Did you follow these Installation Instructions exactly? There is no need to invent a 'new' way, and every chance of it going wrong if you do!
2) You MUST avoid using built-in Windows extract to unpack any/all ZIPs. Use 7-Zip. Windows extract has been proven to corrupt the folder structures.

From your 'Not Found' Errors, I strongly expect you have the ZIP extract problem.

 

[swabygw]

Doing the extraction with 7-Zip solved it. Thanks! (I read the "such as 7-Zip" in the instructions to mean it was just a suggested alternative)

 

[MikeSW17]

Doing the extraction with 7-Zip solved it. Thanks! (I read the "such as 7-Zip" in the instructions to mean it was just a suggested alternative)

Yes, It would be good if @Erel clarified those instructions.
After having very similar problems to yourself, I came across 'hints' that ZIP handling isn't correctly implemented in Windows. I didn't really believe it, so made two parallel extract folders with 7-Wip & windows, then compared them with Winmerge. I found windows extracted several files into spurious "_" folders as sub-folders of where they should be. Details Here: https://www.b4x.com/android/forum/attachments/zipextractdiff_commandline-tools-jpg.100632/

 

[Erel]

You MUST avoid using built-in Windows extract to unpack any/all ZIPs. Use 7-Zip. Windows extract has been proven to corrupt the folder structures.

I don't think that it is always true. Maybe it depends on the Windows version. I believe that with Windows 10 the built-in extraction works properly.

 

[Pendrush]

I believe that with Windows 10 the built-in extraction works properly.

Failed on my system (Win 10 x64 v20H2). Extraction is successful, but does not work as it should.

 

[MikeSW17]

Windows Extract Didn't work on my Windows 10 (Win 10 x64).

It's the one I did the WinDiff comparison of extracts in my post: https://www.b4x.com/android/forum/attachments/zipextractdiff_commandline-tools-jpg.100632/

I'm absolutely *not* trusting Windows Extract any more - 7-Zip every time. Besides, it's far faster on large archive extracts.

 

[agraham]

I'm absolutely *not* trusting Windows Extract any more

I should have taken note of which one but the webpage of a recent Microsoft download I did warned against using File Explorer to decompress it!

 

[Albert Kallal]

I also found this issue - had to use 7-zip - windows zip worked for the B4A install + setup.
However, but for the emulator - it did not work.
Re-extracting with 7-zip also fixed this for me.

I used Edge browser (but is now chrome based one) to download.

R
Albert

 

[MikeSW17]

Seems there's sufficient evidence to recommend the usage of 7-Zip in the B4A Installation Instructions?

 

[Erel]

Seems there's sufficient evidence to recommend the usage of 7-Zip in the B4A Installation Instructions?

It is recommended in the instructions.

 

[agraham]

It is recommended in the instructions.

Perhaps you should also recommend it for OpenJDK 11 in B4A and B4J.