Android Tutorial Google Maps

Erel · Feb 24, 2016

Installation instructions:

- Register your app in Google developer console: https://console.developers.google.com
You need to enable Google Maps Android API.
Then click on Credentials -> Create Credentials -> API Key -> Android Key.
You should get a key that looks like: AIzaSyCmFHamGE0O0BvxxxxxxxxXbTCSrjFVg-Q

- Copy the attached library and put it in the additional libraries folder. Add a reference to the GoogleMaps library.

- Add this to the manifest editor (replace the value with your key):

B4X:

CreateResourceFromFile(Macro, FirebaseAnalytics.GooglePlayBase)

AddApplicationText(
<meta-data
  android:name="com.google.android.geo.API_KEY"
  android:value="xxxxxxxxxxxxxx"/>
)

AddApplicationText(
<uses-library
      android:name="org.apache.http.legacy"
      android:required="false" />
)

Don't add #AdditionalRes or #ExcludeClasses.

- Set minSdkVersion to 14 (Android 4).

- Add a MapFragment with the visual designer. It will appear under the CustomView menu. If you don't see it then make sure that the GoogleMaps library is selected.
You can change the properties from the designer.
Set the anchors to BOTH so the map will fill the activity:

Implement the Ready event to get a reference to the GoogleMap object.
Complete code:

B4X:

Sub Process_Globals
   Private rp As RuntimePermissions
End Sub

Sub Globals
   Private gmap As GoogleMap
   Private MapFragment1 As MapFragment
End Sub

Sub Activity_Create(FirstTime As Boolean)
   Activity.LoadLayout("1")
   Wait For MapFragment1_Ready
   gmap = MapFragment1.GetMap
   rp.CheckAndRequest(rp.PERMISSION_ACCESS_FINE_LOCATION)
   Wait For Activity_PermissionResult (Permission As String, Result As Boolean)
   If Result Then
       gmap.MyLocationEnabled = True
   Else
       Log("No permission!")
   End If
End Sub

Notes

Updates

- v2.50 - Required dependencies were added to the library.
My Location Enabled property was removed from the designer as it needs to be set after the permission is granted.
- v2.02 EXTERNAL_STORAGE permission removed. It is no longer required.
GetOpenSourceLicenseInfo returns an empty string.
Fixes an issue with the ready event being lost if the activity is paused before the map is ready.

Note that you will need to update the package name and api key in the attached example.

Erel · May 3, 2017

I got a different error than the one you got. You need to add MagFragment with the designer instead of initializing it in your code:

evbedp · May 3, 2017

i can't found MapFragment in designer, that's why i'm initializing in my code.

Erel said:
I got a different error than the one you got. You need to add MagFragment with the designer instead of initializing it in your code:

Erel · May 3, 2017

You are using an old version of GoogleMaps library.
The version should be 2.00 (+).
https://www.b4x.com/android/forum/threads/google-maps.63930/#content

evbedp · May 3, 2017

Erel said:
You are using an old version of GoogleMaps library.
The version should be 2.00 (+).
https://www.b4x.com/android/forum/threads/google-maps.63930/#content

Thank You Erel, it's work now.

ThePuiu · May 17, 2017

I followed all the steps in the tutorial (hope!), but when compiling, I get the error message:
B4A version: 6.31
Parsing code. (0.00s)
Compiling code. (0.06s)
Compiling layouts code. (0.00s)
Organizing libraries. Error
Maven artifact not found: com.google.android.gms/play-services-maps

I attached a small test project to show the error. Attached is also the SDK Manager configuration.
Pls, can anyone tell me what's wrong?

DonManfred · May 17, 2017

ThePuiu said:
I followed all the steps in the tutorial (hope!)

NO you did NOT.
Check the Tutorial again. You are missing the google Pla< Services Base Snippet.
Additionylly you are NOT handling the Map ready event where you get the reference to gmap.

ThePuiu · May 17, 2017

I tried to add this code to the manifest editor, but the result is the same:
Maven artifact not found: com.google.android.gms/play-services-maps

Pls help!

B4X:

'************ Firebase Base ************
CreateResourceFromFile("google-services", "google-services.json")
AddPermission(android.permission.ACCESS_NETWORK_STATE)
AddPermission(android.permission.INTERNET)
AddPermission(android.permission.WAKE_LOCK)
AddPermission(com.google.android.c2dm.permission.RECEIVE)
AddPermission(${applicationId}.permission.C2D_MESSAGE)
AddManifestText( <permission android:name="${applicationId}.permission.C2D_MESSAGE"
  android:protectionLevel="signature" />)
AddApplicationText(
<receiver
  android:name="com.google.android.gms.measurement.AppMeasurementReceiver"
  android:enabled="true">
  <intent-filter>
  <action android:name="com.google.android.gms.measurement.UPLOAD"/>
  </intent-filter>
  </receiver>

  <service
  android:name="com.google.android.gms.measurement.AppMeasurementService"
  android:enabled="true"
  android:exported="false"/>
   <provider
  android:authorities="${applicationId}.firebaseinitprovider"
  android:name="com.google.firebase.provider.FirebaseInitProvider"
  android:exported="false"
  android:initOrder="100" />
    <receiver
  android:name="com.google.android.gms.measurement.AppMeasurementReceiver"
  android:enabled="true">
  <intent-filter>
  <action android:name="com.google.android.gms.measurement.UPLOAD"/>
  </intent-filter>
  </receiver>

  <service
  android:name="com.google.android.gms.measurement.AppMeasurementService"
  android:enabled="true"
  android:exported="false"/>
   <receiver
  android:name="com.google.firebase.iid.FirebaseInstanceIdReceiver"
  android:exported="true"
  android:permission="com.google.android.c2dm.permission.SEND" >
  <intent-filter>
  <action android:name="com.google.android.c2dm.intent.RECEIVE" />
  <action android:name="com.google.android.c2dm.intent.REGISTRATION" />
  <category android:name="${applicationId}" />
  </intent-filter>
  </receiver>
    <receiver
  android:name="com.google.firebase.iid.FirebaseInstanceIdInternalReceiver"
  android:exported="false" />


  <service
  android:name="com.google.firebase.iid.FirebaseInstanceIdService"
  android:exported="true">
  <intent-filter android:priority="-500">
  <action android:name="com.google.firebase.INSTANCE_ID_EVENT" />
  </intent-filter>
  </service>
)
'************ Firebase Base (end) ************

DonManfred · May 17, 2017

AGAIN: Go again over the Tutorial and FOLLOW IT EXACTLY.
Start a new project and try again.

NOW you added MUCH MORE THAN NEEDED to the Manifest.

ThePuiu · May 17, 2017

I just want to put some markers on the map. I do not know for which of the above code lines is needed. Whether I put all the code from the "Always required when using Firebase:" section, or just left a part of it or deleted it from the manifest editor, the error message from the compilation was the same. If you think the problem comes from the manifest code, please make a copy / paste with the required piece of code. I think a functional example of the attached library was very good for us who are at the beginning of the road ...
I hope not bother you too much!

DonManfred · May 17, 2017

ThePuiu said:
I do not know for which of the above code lines is needed.

Reading and understanding the lines read does help

ThePuiu · May 17, 2017

Sorry, but I do not see any difference from the code posted. Instead, I discovered a possible problem: i don't have that path on my computer:
<android sdk>\extras\google\google_play_services\libproject\google-play-services_lib\res
There are only 2 subfolders in my google_play_services folder: docs and samples and there is no \ libproject \ google-play-services_lib \ res folder...
it is normal?
If I comment the line #AdditionalJar: com.google.android.gmslay-services-maps I'm not getting an error anymore, obviously the map does not work

DonManfred · May 17, 2017

ThePuiu said:
i don't have that path on my computer

You dont need this folder and even not the resource inside this folder. It is all in the maven repositories.

ThePuiu · May 20, 2017

The problem was generated by an incorrect path to the android.jar file! Now it's ok. I want to draw a line between the current position and a marker on the map. Line must move with the movement of the current position. How can this be done without leaving the previous lines on the map?
Thank you for your patience Manfred!

later edit:
Another problem for me is that I want the application to work in background with the tablet paused. When I get close to a marker to alert me. I have initialized the GPS in Starter but the application does not work in background. The GPS remains active (I think), but the sound signal is only received after the tablet comes out of the pause. Can I do what I want?

DonManfred · May 20, 2017

Image the situation. You get a new locationevent. Inside the event you get the actual position (before you change it) of the marker.
You now can draw a polyline from the old location to the new location. You then change the markers location to the new one to let the marker "move"...
But with creating a new polyline in each locationevent you can draw a line for the hole trip.

That`s all theory but it should work like this i guess. I never needed it.

BUT: You should create a NEW thread in the Questions forum for any new question you have.

shb777 · Jul 27, 2017

why can't you get it to work. and zip it up, so we can download it, and it will work right away?

Erel · Jul 27, 2017

Everything you need from B4A side is available in the first post.

You also need to follow the steps and get an API key from Google.

shb777 · Jul 27, 2017

i can't register or login with firebase

Erel · Jul 27, 2017

Please start a new thread in the questions forum.

javiers · Aug 1, 2017

Error...

*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
*** Service (firebasemessaging) Create ***
** Service (firebasemessaging) Start **
android.content.res.Resources$NotFoundException: Unable to find resource ID #0x2711
at android.content.res.Resources.getResourceName(Resources.java:2363)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:891)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1072)
at android.app.BackStackRecord.run(BackStackRecord.java:852)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:452)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:194)
at android.app.ActivityThread.main(ActivityThread.java:5637)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)

DonManfred · Aug 1, 2017

javiers said:
Error...

Please create a NEW Thread in the QUESTIONS forum posting the relevant code or better a project which shows the problem.

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