Auto phone number read in android sample example

Manifest.xml

<uses-permission android:name="android.permission.READ_PHONE_STATE" android:maxSdkVersion="29" />
<uses-permission android:name="android.permission.READ_PHONE_NUMBERS" />

Layout xml file:

<?xml version = "1.0" encoding = "utf-8"?>
<LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"
    xmlns:app = "http://schemas.android.com/apk/res-auto"
    xmlns:tools = "http://schemas.android.com/tools"
    android:layout_width = "match_parent"
    android:layout_height = "match_parent"
    android:orientation="vertical">

    <TextView
        android:id = "@+id/phoneNumber"
        android:layout_width = "wrap_content"
        android:layout_height = "wrap_content"
        android:text = "phone number"
        android:layout_marginTop="@dimen/padding_40dp"/>
</LinearLayout>

Fragment:

 package com.example.questionpaper.Screens.mytest;

import android.Manifest;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.core.app.ActivityCompat;
import androidx.fragment.app.Fragment;

import com.example.questionpaper.Activity.ContainerActivity;
import com.example.questionpaper.Common.Utility;
import com.example.questionpaper.R;

import static android.Manifest.permission.READ_PHONE_NUMBERS;
import static android.Manifest.permission.READ_PHONE_STATE;
import static android.Manifest.permission.READ_SMS;

public class NotificationsScreenFragment   extends Fragment {
    private ProgressDialog pDialog;
    private ContainerActivity activity;
    TextView phoneNumber;
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v=inflater.inflate(R.layout.notifications_screen_fragment,container,false);
        this.activity=(ContainerActivity) getActivity();
        pDialog= Utility.getProgressDialog(getActivity());
        initViews(v);
        return v;
    }

    private void initViews(View v) {
        phoneNumber= v.findViewById(R.id.phoneNumber);

        if (ActivityCompat.checkSelfPermission(getContext(), READ_SMS) == PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(getContext(), READ_PHONE_NUMBERS) ==
                        PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(),
                READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED) {
            TelephonyManager tMgr = (TelephonyManager)getContext().getSystemService(Context.TELEPHONY_SERVICE);
            String mPhoneNumber = tMgr.getLine1Number();
            phoneNumber.setText(mPhoneNumber);
            return;
        } else {
            requestPermission();
        }
    }
    private void requestPermission() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            requestPermissions(new String[]{READ_SMS, READ_PHONE_NUMBERS, READ_PHONE_STATE}, 100);
        }
    }
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case 100:
                TelephonyManager tMgr = (TelephonyManager)  getContext().getSystemService(Context.TELEPHONY_SERVICE);
                if (ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.READ_SMS) !=
                        PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(getContext(),
                        Manifest.permission.READ_PHONE_NUMBERS) != PackageManager.PERMISSION_GRANTED  &&
                        ActivityCompat.checkSelfPermission(getContext(), Manifest.permission.READ_PHONE_STATE) !=      PackageManager.PERMISSION_GRANTED) {
                    return;
                }
                String mPhoneNumber = tMgr.getLine1Number();
                phoneNumber.setText(mPhoneNumber);
                break;
        }
    }
}