这是一个更简单的答案:

public String getMyPhoneNumber()
{
    return ((TelephonyManager) getSystemService(TELEPHONY_SERVICE))
            .getLine1Number();
}

首先在Intent中初始化你的符号

private val signInIntent = registerForActivityResult(ActivityResultContracts.StartIntentSenderForResult()) { result ->
        try {
            val phoneNumber = Identity.getSignInClient(requireContext()).getPhoneNumberFromIntent(result.data)
            // Note phone number will be in country code + phone number format           
        } catch (e: Exception) {
        }
    }

要打开谷歌播放意图，并显示与谷歌帐户相关联的电话号码，请使用此

val phoneNumberHintIntentRequest = GetPhoneNumberHintIntentRequest.builder()
            .build()
        Identity.getSignInClient(requireContext())
            .getPhoneNumberHintIntent(phoneNumberHintIntentRequest)
            .addOnSuccessListener { pendingIntent ->
                signInIntent.launch(IntentSenderRequest.Builder(pendingIntent).build())
            }.addOnFailureListener {
                it.printStackTrace()
            }

注意:

如果用户禁用电话号码共享，此操作将失败。如果是这样，用户必须从设置->谷歌->自动填充->电话号码共享 如果您正在使用播放服务不可用的模拟设备，这将不起作用

以下是我找到的解决方案的组合(这里是示例项目，如果你也想检查自动填充):

清单

    <uses-permission android:name="android.permission.READ_PHONE_STATE" />

build.gradle

    implementation "com.google.android.gms:play-services-auth:17.0.0"

MainActivity.kt

class MainActivity : AppCompatActivity() {
    private lateinit var googleApiClient: GoogleApiClient

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        tryGetCurrentUserPhoneNumber(this)
        googleApiClient = GoogleApiClient.Builder(this).addApi(Auth.CREDENTIALS_API).build()
        if (phoneNumber.isEmpty()) {
            val hintRequest = HintRequest.Builder().setPhoneNumberIdentifierSupported(true).build()
            val intent = Auth.CredentialsApi.getHintPickerIntent(googleApiClient, hintRequest)
            try {
                startIntentSenderForResult(intent.intentSender, REQUEST_PHONE_NUMBER, null, 0, 0, 0);
            } catch (e: IntentSender.SendIntentException) {
                Toast.makeText(this, "failed to show phone picker", Toast.LENGTH_SHORT).show()
            }
        } else
            onGotPhoneNumberToSendTo()

    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (requestCode == REQUEST_PHONE_NUMBER) {
            if (resultCode == Activity.RESULT_OK) {
                val cred: Credential? = data?.getParcelableExtra(Credential.EXTRA_KEY)
                phoneNumber = cred?.id ?: ""
                if (phoneNumber.isEmpty())
                    Toast.makeText(this, "failed to get phone number", Toast.LENGTH_SHORT).show()
                else
                    onGotPhoneNumberToSendTo()
            }
        }
    }

    private fun onGotPhoneNumberToSendTo() {
        Toast.makeText(this, "got number:$phoneNumber", Toast.LENGTH_SHORT).show()
    }


    companion object {
        private const val REQUEST_PHONE_NUMBER = 1
        private var phoneNumber = ""

        @SuppressLint("MissingPermission", "HardwareIds")
        private fun tryGetCurrentUserPhoneNumber(context: Context): String {
            if (phoneNumber.isNotEmpty())
                return phoneNumber
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                val subscriptionManager = context.getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE) as SubscriptionManager
                try {
                    subscriptionManager.activeSubscriptionInfoList?.forEach {
                        val number: String? = it.number
                        if (!number.isNullOrBlank()) {
                            phoneNumber = number
                            return number
                        }
                    }
                } catch (ignored: Exception) {
                }
            }
            try {
                val telephonyManager = context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
                val number = telephonyManager.line1Number ?: ""
                if (!number.isBlank()) {
                    phoneNumber = number
                    return number
                }
            } catch (e: Exception) {
            }
            return ""
        }
    }
}

private String getMyPhoneNumber(){
    TelephonyManager mTelephonyMgr;
    mTelephonyMgr = (TelephonyManager)
        getSystemService(Context.TELEPHONY_SERVICE); 
    return mTelephonyMgr.getLine1Number();
}

private String getMy10DigitPhoneNumber(){
    String s = getMyPhoneNumber();
    return s != null && s.length() > 2 ? s.substring(2) : null;
}

代码摘自http://www.androidsnippets.com/get-my-phone-number

while working on a security app which needed to get the phone number of who so ever my phone might get into their hands, I had to do this; 1. receive Boot completed and then try getting Line1_Number from telephonyManager which returns a string result. 2. compare the String result with my own phone number and if they don't match or string returns null then, 3. secretly send an SMS containing the string result plus a special sign to my office number. 4. if message sending fails, start a service and keep trying after each hour until sent SMS pending intent returns successful. With this steps I could get the number of the person using my lost phone. it doesn't matter if the person is charged.

首先，获取用户的手机号码是违反道德政策的，以前是可能的，但现在根据我的研究，没有可靠的解决方案，通过使用一些代码，有可能获得手机号码，但不能保证可能只在少数设备上工作。经过大量的研究，我发现只有三个解决方案，但他们不是在所有设备工作。

有以下原因，为什么我们没有得到。

1.Android设备和新的Sim卡没有存储手机号码，如果手机号码在设备和Sim卡中都不可用，那么如何获得号码，如果任何旧的Sim卡有手机号码，那么使用Telephony manager我们可以获得号码，否则它将返回“null”或“”或“??????”

<uses-permission android:name="android.permission.READ_PHONE_STATE"/>

 TelephonyManager tel= (TelephonyManager)this.getSystemService(Context.
            TELEPHONY_SERVICE);
    String PhoneNumber =  tel.getLine1Number();

注:-我已经在以下设备Moto x，三星Tab 4，三星S4, Nexus 5和红米2 prime上测试了这个解决方案，但它并不是每一个都有效 Time返回空字符串，所以结论是没有用的

此方法仅适用于红米2 '，但为此需要添加 读取清单中的联系人权限。

注意:-这也不是保证和有效的解决方案，我已经在许多设备上测试了这个解决方案，但它只在红米2撇中工作 哪个是双卡设备它给了我两个手机号码第一个是 正确，但第二个不属于我的第二个模拟，它属于 我的一些旧sim卡，我没有使用。

 String main_data[] = {"data1", "is_primary", "data3", "data2", "data1",
            "is_primary", "photo_uri", "mimetype"};
    Object object = getContentResolver().
            query(Uri.withAppendedPath(android.provider.ContactsContract.Profile.CONTENT_URI, "data"),
            main_data, "mimetype=?",
            new String[]{"vnd.android.cursor.item/phone_v2"},
            "is_primary DESC");
    String s1="";
    if (object != null) {
        do {
            if (!((Cursor) (object)).moveToNext())
                break;
            // This is the phoneNumber
             s1 =s1+"---"+ ((Cursor) (object)).getString(4);
        } while (true);
        ((Cursor) (object)).close();
    }

在我的研究中，我发现之前使用WhatsApp账户可以获得手机号码，但现在新的WhatsApp版本不存储用户的手机号码。

结论:Android没有任何可靠的解决方案 用户的手机号码。 建议:- 1。如果你想验证用户的手机号码，请问 用户提供他的号码，使用otp可以验证。 如果你想识别用户的设备，你可以很容易地获得设备IMEI号。