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第一步获取权限

 Manifest.permission.READ_PHONE_STATEManifest.permission.ANSWER_PHONE_CALLSManifest.permission.READ_CALL_LOG   Manifest.permission.READ_CONTACTS

第二步 注册监听

private var telephonyManager: TelephonyManager? = nullprivate var mPhoneStateListener: PhoneStateListener? = nullprivate fun lisPhone(){telephonyManager = getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManagermPhoneStateListener =  object :PhoneStateListener() {override fun onCallStateChanged(state: Int, phoneNumber: String?) {super.onCallStateChanged(state, phoneNumber)when (state) {//挂断TelephonyManager.CALL_STATE_IDLE -> {Log.e("电话监听", "onCallStateChanged: 挂断${phoneNumber}")}//接听TelephonyManager.CALL_STATE_OFFHOOK -> {Log.i("电话监听", "onCallStateChanged: 接听${phoneNumber}")}//响铃TelephonyManager.CALL_STATE_RINGING -> {Log.i("电话监听", "onCallStateChanged: 响铃${phoneNumber}")}}}}telephonyManager!!.listen(mPhoneStateListener!!,PhoneStateListener.LISTEN_CALL_STATE)}

结尾 取消监听

    private fun cancelPhoneStateListener(){// 取消来电的电话状态监听服务if (telephonyManager != null && telephonyManager != null) {telephonyManager!!.listen(mPhoneStateListener, PhoneStateListener.LISTEN_NONE);}}