Simple Android Plugin not working! Any idea ?!

Hi everyone,

I am trying to make an android plugin for unity that simply displays a dialog box to enable gps.

Below is the Java code inside the gpsplugin.jar file:

Code (CSharp):

1.  
2. package com.ultimategames.gpslib;
3.  
4. import android.app.Activity;
5. import android.content.IntentSender;
6.  
7. import com.google.android.gms.appindexing.AppIndex;
8. import com.google.android.gms.common.api.GoogleApiClient;
9. import com.google.android.gms.common.api.PendingResult;
10. import com.google.android.gms.common.api.ResultCallback;
11. import com.google.android.gms.common.api.Status;
12. import com.google.android.gms.location.LocationRequest;
13. import com.google.android.gms.location.LocationServices;
14. import com.google.android.gms.location.LocationSettingsRequest;
15. import com.google.android.gms.location.LocationSettingsResult;
16. import com.google.android.gms.location.LocationSettingsStates;
17. import com.google.android.gms.location.LocationSettingsStatusCodes;
18. import com.unity3d.player.UnityPlayer;
19. import com.unity3d.player.UnityPlayerActivity;
20.  
21. import java.io.DataOutputStream;
22.  
23. public class GPSClass extends UnityPlayerActivity {
24.  
25.     GoogleApiClient googleApiClient;
26.     LocationRequest locationRequest;
27.  
28.     public void AskToEnableGPS(final Activity activity) {
29.  
30.         if (googleApiClient == null) {
31.             googleApiClient = new GoogleApiClient.Builder(activity.getApplicationContext()).addApi(LocationServices.API).build();
32.             googleApiClient.connect();
33.  
34.             locationRequest = LocationRequest.create();
35.             locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
36.             locationRequest.setInterval(30 * 1000);
37.             locationRequest.setFastestInterval(5 * 1000);
38.  
39.             LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(locationRequest);
40.  
41.             builder.setAlwaysShow(true);
42.  
43.             PendingResult<LocationSettingsResult> result =
44.                     LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
45.  
46.             result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
47.                 @Override
48.                 public void onResult(LocationSettingsResult result) {
49.                     final Status status = result.getStatus();
50.                     final LocationSettingsStates state = result.getLocationSettingsStates();
51.                     switch (status.getStatusCode()) {
52.                         case LocationSettingsStatusCodes.SUCCESS:
53.                             break;
54.                         case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
55.                             try {
56.                                 status.startResolutionForResult((Activity) activity.getApplicationContext(), 1000);
57.                             } catch (IntentSender.SendIntentException e) {
58.                             }
59.                             break;
60.                         case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
61.                             break;
62.                     }
63.                 }
64.             });
65.         }
66.     }
67. }
68.  

And here you have the code on Testing.cs script that I am using to access the plugin:

Code (CSharp):

1.  
2. using UnityEngine;
3.  
4. public class Testing : MonoBehaviour {
5.  
6.     #if UNITY_ANDROID
7.  
8.     AndroidJavaObject javaObject;
9.     AndroidJavaClass unityClass;
10.     AndroidJavaObject unityActivity;
11.  
12.     private void Start()
13.     {
14.         javaObject = new AndroidJavaObject("com.ultimategames.gpslib.GPSClass");
15.         unityClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
16.         unityActivity = unityClass.GetStatic<AndroidJavaObject>("currentActivity");
17.     }
18.  
19.     public void AskforGPS()
20.     {
21.         javaObject.Call("AskToEnableGPS", unityActivity);
22.     }
23.  
24. #endif
25. }
26.  

The code is working fine when I run it as an application in android studio to my device but when I use the plugin in Unity it doesn't work on my device. Also, I have searched on google and I haven't found a solution for this.

I would appreciate any help or idea guys.

Thank you,
Gerald

 

This is the error that I get from Logcat:

Code (CSharp):

1. 08-15 20:55:53.436 4847-4865/? E/Unity: AndroidJavaException: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/api/GoogleApiClient$Builder;
2.     java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/api/GoogleApiClient$Builder;
3.         at com.ultimategames.gpslib.GPSClass.AskToEnableGPS(GPSClass.java:82)
4.         at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
5.         at com.unity3d.player.UnityPlayer.c(Unknown Source)
6.         at com.unity3d.player.UnityPlayer$e$2.queueIdle(Unknown Source)
7.         at android.os.MessageQueue.next(MessageQueue.java:392)
8.         at android.os.Looper.loop(Looper.java:143)
9.         at com.unity3d.player.UnityPlayer$e.run(Unknown Source)
10.      Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.common.api.GoogleApiClient$Builder" on path: DexPathList[[zip file "/data/app/com.ultimategames.testing-1/base.apk"],nativeLibraryDirectories=[/data/app/com.ultimategames.testing-1/lib/arm, /data/app/com.ultimategames.testing-1/base.apk!/lib/armeabi-v7a, /vendor/lib, /system/l
11.  

 

I managed to solve this by myself.

 

Hi @G3R1. If you can post the solution that you found it would be great. I myself am trying to learn about plugins and stuff in Unity and I believe your solution would help me in future.
Thanks.

 

Sure.
The solution:
1- Make sure to copy your android plugin .jar file into Assets/Plugins/Android folder in Unity.
2- Download Google Play Game Services for Unity and then import all the dependencies in Unity using the unity package inside "current-build" folder that is inside the package you download from GitHub.
3- Go to menu Assets-> Play Services Resolver-> Android Resolver -> Force Resolve.
After you have clicked Force Resolve Unity will generate the necessary .aar and .jar files for Google Play Services.
At this moment you can copy the version number of the .aar files, for ex: "com-google-android-gms-play-services:11.6.2". You need to copy the number "11.6.2".
4- Then go back to your plugin on Android Studio and open build.gradle (module: yourpluginname) and change the version of Play Services as below:

Code (CSharp):

1.  
2. dependencies {
3.     implementation fileTree(include: ['*.jar'], dir: 'libs')
4.     implementation 'com.android.support:appcompat-v7:25.2.0'
5.     implementation 'com.android.support:support-v4:25.2.0'
6.     testImplementation 'junit:junit:4.12'
7.     androidTestImplementation 'com.android.support.test:runner:1.0.2'
8.     androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
9.     implementation files('/Applications/Unity/PlaybackEngines/AndroidPlayer/Variations/mono/Release/Classes/classes.jar')
10.     implementation 'com.google.android.gms:play-services:11.6.2'
11. }

5- After you have changed the version number of dependecies on your plugin you have to build the plugin module again and copy it to Assets/Plugins/Android and the error :

Code (CSharp):

1. Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.common.api.GoogleApiClient$Builder"

will not appear anymore and the plugin should work just fine.

If the error says that another class is missing, you just have to download the .jar file of that class and include it to Assets/Plugins/Android in Unity and build it again to see if the error is gone.

I don't have much time to give you a detailed solution but this should work 100%.

 

Also, you can download .jar classes from here https://mvnrepository.com.
Search the name of the class and then download the .jar or .aar file. If you download the .aar file you need to get the .jar class file inside the .aar package and then paste it into Assets/Plugins/Android.

Hope it helps!

 

Thanks a lot! It did help me.

 

@G3R1 Im using same coding as of yours ,i cannot see location dialog box,settingsapi has been deprecated in android but i have used latest as getsettingsapi.
i tried using this link
https://stackoverflow.com/questions/29801368/how-to-show-enable-location-dialog-like-google-maps

But im not getting Enabling Location Dialog Box ,can you help me to get enabling location dialog box.

 

Can you provide the code you are using to achieve this plugin ? I need to see your code and compare it and then see if there is any mistake.

 

@G3R1 please find the code below

package com.jazzigames.gpsenabledialog;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.content.IntentSender;
import android.widget.Toast;

//import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.Builder;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.ResolvableApiException;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationSettingsRequest;
import com.google.android.gms.location.LocationSettingsResult;
import com.google.android.gms.location.LocationSettingsStates;
import com.google.android.gms.location.LocationSettingsStatusCodes;
import com.google.android.gms.location.LocationSettingsResponse;
import com.google.android.gms.tasks.Task;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.unity3d.player.UnityPlayer;
import com.unity3d.player.UnityPlayerActivity;



public class MainActivity extends UnityPlayerActivity {

GoogleApiClient googleApiClient;
LocationRequest locationRequest;
int REQUEST_CHECK_SETTINGS = 100;

public void AskToEnableGPS(final Activity activity) {

if (googleApiClient == null) {
googleApiClient = new GoogleApiClient.Builder(activity.getApplicationContext()).addApi(LocationServices.API).build();
googleApiClient.connect();

locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(30 * 1000);
locationRequest.setFastestInterval(5 * 1000);

LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder().addLocationRequest(locationRequest);

builder.setAlwaysShow(true);


Task<LocationSettingsResponse> result = LocationServices.getSettingsClient(this).checkLocationSettings(builder.build());

// LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
// LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());

result.addOnCompleteListener(new OnCompleteListener<LocationSettingsResponse>() {
@override
public void onComplete(Task<LocationSettingsResponse> task) {
try {
LocationSettingsResponse response = task.getResult(ApiException.class);
// All location settings are satisfied. The client can initialize location
// requests here.

} catch (ApiException exception) {
switch (exception.getStatusCode()) {
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by showing the
// user a dialog.
try {
// Cast to a resolvable exception.
ResolvableApiException resolvable = (ResolvableApiException) exception;
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
resolvable.startResolutionForResult(
MainActivity.this,
101);
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
} catch (ClassCastException e) {
// Ignore, should be an impossible error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way to fix the
// settings so we won't show the dialog.
break;
}
}
}
});
}
}

@override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CHECK_SETTINGS) {

if (resultCode == RESULT_OK) {

Toast.makeText(getApplicationContext(), "GPS enabled", Toast.LENGTH_LONG).show();
} else {

Toast.makeText(getApplicationContext(), "GPS is not enabled", Toast.LENGTH_LONG).show();
}

}
}
}



Dependencies

apply plugin: 'com.android.library'


android {
compileSdkVersion 26
defaultConfig {

minSdkVersion 16
targetSdkVersion 26
versionCode 1
versionName "1.0"
multiDexEnabled true
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
productFlavors {
}
}

dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs' )//, exclude: ['classes.jar'])

implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support:support-annotations:28.0.0'
implementation 'com.android.support:multidex:1.0.3'

implementation 'com.android.support.constraint:constraint-layout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.android.gmslay-services-location:11.0.4'
compileOnly files('libs/classes.jar')
}

task deleteOldJar(type: Delete) {
delete 'release/GpsEnable.jar'
}

//task to export contents as jar
task exportJar(type: Copy) {
from('build/intermediates/packaged-classes/release/')
into('release/')
include('classes.jar')
///Rename the jar
rename('classes.jar', 'GpsEnable.jar')
}

exportJar.dependsOn(deleteOldJar, build)



Im getting following error in it after checking log
12-17 12:01:30.191 8735 8751 E Unity : AndroidJavaException: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/api/Api$zzf;
12-17 12:01:30.191 8735 8751 E Unity : java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/gms/common/api/Api$zzf;
12-17 12:01:30.191 8735 8751 E Unity : at com.google.android.gms.location.LocationServices.<clinit>(Unknown Source)
12-17 12:01:30.191 8735 8751 E Unity : at com.jazzigames.gpsenabledialog.MainActivity.AskToEnableGPS(MainActivity.java:44)
12-17 12:01:30.191 8735 8751 E Unity : at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
12-17 12:01:30.191 8735 8751 E Unity : at com.unity3d.player.UnityPlayer.c(Unknown Source)
12-17 12:01:30.191 8735 8751 E Unity : at com.unity3d.player.UnityPlayer$e$2.queueIdle(Unknown Source)
12-17 12:01:30.191 8735 8751 E Unity : at android.os.MessageQueue.next(MessageQueue.java:397)
12-17 12:01:30.191 8735 8751 E Unity : at android.os.Looper.loop(Looper.java:148)
12-17 12:01:30.191 8735 8751 E Unity : at com.unity3d.player.UnityPlayer$e.run(Unknown Source)
12-17 12:01:30.191 8735 8751 E Unity : Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.gms.common.api.Api$zzf" on path: DexPathList[[zip file "/data/app/com.jazzigames.gps-2/base.apk"],nativeLibraryDirectories=[/data/app/com.jazzigames.gps-2/lib/arm, /data/app/com.jazzigames.gps-2/base.apk!/lib/armeabi-v7a,

 

Unfortunately, I didn't find my project for this plugin but I found the .jar classes that I have been using for that project and the error you get is related to the missing of one of the .jar classes. I guess you haven't donwload all the necessary classes from https://mvnrepository.com.

Below I am attaching the .jar classes that you need to copy and paste into the "Plugins/Android" folder.
Copy only the .jar classes and make sure you save them because I may remove them from google drive in the future.

https://drive.google.com/drive/folders/1Gq6qvTRr0jPTrqI0dsMOD98fafDUrP2K?usp=sharing

I will try and remake this plugin in the next days.