Newbie question on Firebase setup

[melindamongar-commits]

I am trying to learn a little bit about app development and how this app works. I am with team 5013 and we have looked at your application for scouting. There was a few things we wanted to expand on potentially but I don't really recall what those things were but thought I would try getting things to run locally. I am a Database person really and this is somewhat new to me.

I got the application to build in Android Studio and deploy to the emulator. I did create my own Firebase project but I am getting an error around the Firebase database url. I figure that I am missing something on the deployment to firebase. Do you know what I might be missing? Maybe a script to create the DB structure in Firebase?

Thanks,
Melinda

[bherbst]

I'm excited to hear that you are interested in the app and are trying to build it yourself!

First - I'll say that the current code on the main branch is a bit outdated in terms of modern Android development. We are in the process of a bigger rewrite using a more modern set of tools on mainv4, but that isn't particularly close to ready for use yet.

As for your actual request - I suspect you are right that the app just isn't resiliient to issues with the database format. Without seeing the entire error that you saw it is a little hard to guess though.

I'll also say the only functionality that we use in Firebase's realtime database is a set of our (KnightKrawler's) metrics from various years, and we haven't updated that in a while because overall usage of those was very very low (most teams preferred to make their own metrics). So you wouldn't be losing much if you ripped out the Firebase data entirely. I'd keep Firebase for crash reporting though!

Here's an export of our database if you want to keep the functionality: frc-krawler-match_perf-export.json.zip. You should be able to import that into your Firebase instance and hopefully that will fix it 🤞

[melindamongar-commits]

That is awesome you are working to update the program to be more up to date. The other one we were looking at and used last year was Robot Scouter but it hasn't been updated in 4 years and when I tried to update to a more reset version of gradle and to use more recent libraries, I faced one deprecated and obsolete bit of code after another. Thought I would try another.

Here is the error I am getting from the log after trying to launch the application in the emulator.

I did download the firebase project (com.frc_scouting_5013.development) google_services.json.

Stacktrace
2022-11-06 17:32:38.880 10406-10406/com.frc_scouting_5013.development E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.frc_scouting_5013.development, PID: 10406
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.frc_scouting_5013.development/com.team2052.frckrawler.activities.SetupActivity}: com.google.firebase.database.DatabaseException: Failed to get FirebaseDatabase instance: Specify DatabaseURL within FirebaseApp or from your getInstance() call.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3676)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3813)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2308)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7898)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)
Caused by: com.google.firebase.database.DatabaseException: Failed to get FirebaseDatabase instance: Specify DatabaseURL within FirebaseApp or from your getInstance() call.
at com.google.firebase.database.FirebaseDatabase.getInstance(com.google.firebase:firebase-database@@16.0.4:114)
at com.google.firebase.database.FirebaseDatabase.getInstance(com.google.firebase:firebase-database@@16.0.4:71)
at com.team2052.frckrawler.firebase.FirebaseUtil.getFirebaseDatabase(FirebaseUtil.java:19)
at com.team2052.frckrawler.activities.SetupActivity.onCreate(SetupActivity.java:56)
at android.app.Activity.performCreate(Activity.java:8290)
at android.app.Activity.performCreate(Activity.java:8269)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1384)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3657)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3813)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2308)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:201)
at android.os.Looper.loop(Looper.java:288)
at android.app.ActivityThread.main(ActivityThread.java:7898)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

[bherbst]

Where did you put your google_services.json file? Have you made any other changes to the app?

[melindamongar-commits]

I updated the app/build.gradle properties file to set applicationId 'com.frc_scouting_5013'. I put my google-services.json in the app directory as well. I created a firebase project for com.frc_scouting_5013 and that had 2 applications com.frc_scouting_5013 and com.frc_scouting_5013.development.

There was a method in SetupActivity.requestEnableBluetooth() that I modified hoping to resolve a build error around Bluetooth permission check. "Call requires permission which may be rejected by user: code should explicitly check to see if permission is available (with checkPermission) or explicitly handle a potential SecurityException".

I used the IDE suggestion and was able to build and start deployment to a Pixel 6.

private void requestEnableBluetooth() { Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) { // TODO: Consider calling // ActivityCompat#requestPermissions // here to request the missing permissions, and then overriding // public void onRequestPermissionsResult(int requestCode, String[] permissions, // int[] grantResults) // to handle the case where the user grants the permission. See the documentation // for ActivityCompat#requestPermissions for more details. return; } startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); }

In launch of the app on the emulated Pixel 6, I got the error on firebase.

[bherbst]

Hmmmm, interesting. Definitely seems like Firebase isn't quite picking up the right configuration from your google-services.json.

Inside that JSON file there should be a client array, and each element in that array should include a client_info object. Is there a client_info object that looks like this?

"client_info": {
  "mobilesdk_app_id": "<snip>",
  "android_client_info": {
    "package_name": "com.frc_scouting_5013.development"
  }
}

[melindamongar-commits]

Yes, it is under FRC-Krawler/app/google-services.json There is nothing in the project. I can probably insert it as is.

{ "project_info": { "project_number": "70016028811", "project_id": "frc---scouting-5013", "storage_bucket": "frc---scouting-5013.appspot.com" }, "client": [ { "client_info": { "mobilesdk_app_id": "1:70016028811:android:06733ed7d4b3afac35048e", "android_client_info": { "package_name": "com.frc_scouting_5013" } }, "oauth_client": [ { "client_id": "70016028811-k4v2eqlmrsrn0e1748h6hkhig5t5o7mg.apps.googleusercontent.com", "client_type": 3 } ], "api_key": [ { "current_key": "AIzaSyA19Pe-lhq7gaBdbEdiAHvlGyomxDGypGQ" } ], "services": { "appinvite_service": { "other_platform_oauth_client": [ { "client_id": "70016028811-k4v2eqlmrsrn0e1748h6hkhig5t5o7mg.apps.googleusercontent.com", "client_type": 3 } ] } } }, { "client_info": { "mobilesdk_app_id": "1:70016028811:android:57c1cdbcdd87036935048e", "android_client_info": { "package_name": "com.frc_scouting_5013.development" } }, "oauth_client": [ { "client_id": "70016028811-k4v2eqlmrsrn0e1748h6hkhig5t5o7mg.apps.googleusercontent.com", "client_type": 3 } ], "api_key": [ { "current_key": "AIzaSyA19Pe-lhq7gaBdbEdiAHvlGyomxDGypGQ" } ], "services": { "appinvite_service": { "other_platform_oauth_client": [ { "client_id": "70016028811-k4v2eqlmrsrn0e1748h6hkhig5t5o7mg.apps.googleusercontent.com", "client_type": 3 } ] } } } ], "configuration_version": "1" }

[bherbst]

Ah interseting! I have a firebase_url in that first project_info object that you seem to be missing.

Maybe try this:

• In the Firebase console if go to to Build > Realtime Database
• Enable the realtime database
• Download a new copy of google-services.json