Android Question unable to compile DJI library example

freedom2000 · Jan 10, 2021

Hi all,

I have got a DJI Spark, and of course I am trying to test the DJI library.
I have done most of the configuration stuff, created account, changed the package name, got the developper key...

But when trying to compile the example I have this error :

B4X:

B4A Version: 10.50
Parsing code.    (0.04s)
    Java Version: 8
Building folders structure.    (0.03s)
Running custom action.    (0.07s)
Compiling code.    (0.05s)
Compiling layouts code.    (0.00s)
Organizing libraries.    Error
Maven artifact not found: androidx.constraintlayout/constraintlayout

Of course I have tried to install it under the SDkManager (and it seems to be installed... but still failing to compile

I have searched on the forum and seen that some others got the same problem. But still stucked.
https://www.b4x.com/android/forum/t...und-when-compiling-djiexample.112200/#content

Any help would be highly apreciated !
Thanks

Erel · Jan 11, 2021

1. Make sure that the path under Tools - Configure Paths - android.jar is correct.
2. Edit C:\Android\android-sdk\extras\b4a_remote\installed-components.txt
Find the two lines with 'constraintlayout' and delete them.

Open B4A Sdk Manager. It should install constraintlayout v1.1.3. That is the correct version.

freedom2000 · Jan 20, 2021

Thanks @Erel for this help and sorry for my late reply...

I have checked android.jar. It points to this

and deleted the lines with constraintlayout.
Then tried to reinstall them. But it definitively tries to download this (version 2.0.4 instead of 1.1.3)
And it gives the same error when compiling...

I don't know where is my bug !
JP

MikeSW17 · Jan 20, 2021

Your SDK version 4333796 is wrong. The current version is 6609375 .

I suggest you follow the B4A install from step 2 here: https://www.b4x.com/b4a.html .
Re-install the Android SDK Command line tools and the required resources.
(Use 7-Zip to extract the Zip files, not Windows extract)

Probably also a good idea to delete the folders and contents you're replacing.

freedom2000 · Jan 21, 2021

Thank you !

I have thus deleted the full android directory and recreated following the BA4 install guide.
I had also to add a few more components "services" and now I skip the errors

But here is a new one...

B4X:

B4A Version: 10.50
Parsing code.    (0.03s)
    Java Version: 8
Building folders structure.    (0.02s)
Running custom action.    (0.05s)
Compiling code.    (0.47s)
Compiling layouts code.    (0.00s)
Organizing libraries.    (0.00s)
    (AndroidX SDK)
Generating R file.    (0.00s)
Compiling generated Java code.    Error
Cannot find: C:\Program Files\Anywhere Software\Basic4android\libraries\dji-sdk-provided-4.14-trial1.jar

As suggested here, I did add these lines :

B4X:

#MultiDex: true
#AdditionalJar: dji-sdk-provided-4.14-trial1, ReferenceOnly

I have tried (randomly !) to change this line by (the name of the downloaded .aar file)

B4X:

#MultiDex: true
#AdditionalJar: dji-sdk-4.14-trial1.aar, ReferenceOnly

It seems to go a little further but not yet successfull

B4X:

B4A Version: 10.50
Parsing code.    (0.03s)
    Java Version: 8
Building folders structure.    (0.02s)
Running custom action.    (0.04s)
Compiling code.    (0.48s)
Compiling layouts code.    (0.00s)
Organizing libraries.    (0.05s)
    (AndroidX SDK)
Generating R file.    (0.00s)
Compiling generated Java code.    Error
B4A line: 247
mission.Initialize(32.836084, 35.268652, 50, 300,
javac 1.8.0_51
src\fr\free\JulienGley\DjiSpark1\b4xmainpage.java:371: error: package dji.common.mission.hotpoint does not exist
_mission.Initialize(32.836084,35.268652,50,300,(float) (20),BA.getEnumFromString(dji.common.mission.hotpoint.HotpointHeading.class,"TOWARDS_HOT_POINT"));
                                                                                                            ^

Still need some help please !
Thanks

Erel · Jan 21, 2021

freedom2000 said:
I have tried (randomly !) to change this line by (the name of the downloaded .aar file)

You are correct, it was missing from dji_additional.zip. It will be online in 2 minutes.

freedom2000 · Jan 21, 2021

Fantastic it works now --> compilation done ?

Thank you for your help.
I have no excuse now not to dive into this great lib !

freedom2000 · Jan 22, 2021

Just to tell you that I successfully connected to my Spark drone
Spark <-> RC <-USB-> Android <-Wifi-> B4X IDE

The App launches fine and shows all sensors + camera (impressive !)
But the mission cannot start with the following error : Error uploading: The estimated time for the mission is too long

I did changed the lat lon in the main :
'change coordinates here and remove the ExitApplication
mission.Initialize(43.5167, 1.5, 50, 300, 20, "TOWARDS_HOT_POINT")

but still get the same error

However I am not sure that Spark is natively supporting WayPoints, they are hidden in DJI GO4 App
But with a patched version they appear and they do work very well (hidden feature to sell more expensive drones...).
I have to check if the waypoints are available in the API for Spark... Probably not seeing the DJI SDK doc...

javiman6969 · Feb 6, 2021

Hi!

I follow all the steps you indicate in the example.
But it gives me the following error:

Erel · Feb 7, 2021

Please start a new thread and post the error as text.

Android Question unable to compile DJI library example

freedom2000

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