Attempt to invoke virtual method 'io.agora.chat.adapter.EMAChatManager io.agora.chat.adapter.EMAChatClient.getChatManager()' on a null object reference

[VishalShahSamcom]

I am trying to create the same application in android but using kotlin. I tried the steps mentioned in the ReadMe file but the steps for activity adding and initiating the EaseCallKit is extremely difficult and confusing to implement those. Still somehow I tried to manage to initiate it.

Adding my "MainAcitivty.kt" File and please correct me if I am wrong, I have created another activity named as "CallSingleBaseActivity" which inherits "EaseCallSingleBaseActivity" as mentioned in the steps.

Just like this.

MainActivity.kt code

 `
  class MainActivity : AppCompatActivity() {
private val callKitListener: EaseCallKitListener = object : EaseCallKitListener {
    override fun onInviteUsers(
        callType: EaseCallType?, existMembers: Array<out String>?, ext: JSONObject?
    ) {
        Log.d("onInviteUsers", "${callType?.name}\n $existMembers \n $ext")
    }

    override fun onEndCallWithReason(
        callType: EaseCallType?,
        channelName: String?,
        reason: EaseCallEndReason?,
        callTime: Long
    ) {
        Log.d(
            "onEndCallWithReason",
            "${callType?.name}\n $channelName \n ${reason?.name} \n $callTime"
        )
    }

    override fun onReceivedCall(
        callType: EaseCallType?, fromUserId: String?, ext: JSONObject?
    ) {
        Log.d("onReceivedCall", "${callType?.name}\n $fromUserId \n $ext")
    }

    override fun onCallError(type: EaseCallError?, errorCode: Int, description: String?) {
        Log.d("onCallError", "${type?.name}\n $errorCode \n $description")
    }

    override fun onInViteCallMessageSent() {
        Log.d("onInViteCallMessageSent", "Invite Call Sent")
    }

    override fun onRemoteUserJoinChannel(
        channelName: String?,
        userName: String?,
        uid: Int,
        callback: EaseCallGetUserAccountCallback?
    ) {
        Log.d("onRemoteUserJoinChannel", "${channelName}\n $userName \n $uid \n $callback")
    }

}
private lateinit var callKit: EaseCallKit
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    enableEdgeToEdge()
    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)
    ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
        val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
        v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
        insets
    }
    val appId = "8041ae7edbde4f4ab8fedd1a45cd6f39"
    val appCertificate = "YOUR_APP_CERTIFICATE"
    val userId = "USER_ID"
    val expireTimeInSeconds = 3600L // 1 hour
    //        val userManager = ContextCompat.getSystemService(this, UserHandle::class.java) as UserHandle
    val employeeUserId = "66cf03577aa063120cc7fb3b"
    val employerUserId = "66cf05677aa063120cc803d7"
    callKit = EaseCallKit.getInstance()
    // Construct the CallKitConfig class.
    val callKitConfig = EaseCallKitConfig()
    // Set the call out time (ms).
    callKitConfig.callTimeOut = 30 * 1000
    // Set the Agora App ID.
    callKitConfig.agoraAppId = appId
    callKitConfig.isEnableRTCToken = true
    val ringFile: String = EaseCallFileUtils.getModelFilePath(this, "huahai.mp3")
    callKitConfig.ringFile = ringFile
    val userInfoMap: HashMap<String, EaseCallUserInfo> = HashMap()
    userInfoMap[employeeUserId] = EaseCallUserInfo("Employee", null)
    userInfoMap[employerUserId] = EaseCallUserInfo("Employer", null)
    callKitConfig.userInfoMap = userInfoMap

    callKit.init(this, callKitConfig)
    callKit.registerVideoCallClass(CallSingleBaseActivity::class.java)
    callKit.setCallKitListener(callKitListener)
    binding.btnJoin.setOnClickListener {
        callKit.startSingleCall(EaseCallType.CONFERENCE_VIDEO_CALL, employeeUserId, null)
    }
}

/*fun generateRtmToken(
    appId: String, appCertificate: String, userId: String, expireTimeInSeconds: Long
): String {
    val tokenBuilder = RtmTokenBuilder2()
    val currentTimestamp = (System.currentTimeMillis() / 1000).toInt()
    val expirationTimestamp = currentTimestamp + expireTimeInSeconds

    return tokenBuilder.buildToken(
        appId, appCertificate, userId, RtmTokenBuilder2.Role.Rtm_User, expirationTimestamp
    )
}*/
}

`

Here as soon as I run the application, it gets crashed and this error pops up.

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'io.agora.chat.adapter.EMAChatManager io.agora.chat.adapter.EMAChatClient.getChatManager()' on a null object reference
at io.agora.chat.ChatClient.chatManager(Unknown Source:15)
at io.agora.chat.callkit.EaseCallKit.removeMessageListener(EaseCallKit.java:875)
at io.agora.chat.callkit.EaseCallKit.init(EaseCallKit.java:146)
at com.vishal.agoracallkit.MainActivity.onCreate(MainActivity.kt:101)
at android.app.Activity.performCreate(Activity.java:8129)
at android.app.Activity.performCreate(Activity.java:8109)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1344)

Can anyone help me out with this?

Also, if possible can anyone add any library or solution on how to use this library for achieving 1 to 1 video calls and also sending and receive Incoming call Dialers and rest of that.

[xuchengpu]

the Chat SDK should be initialized before you call EaseCallKit.init() . It is already mentioned in the initialization steps of the readme file