Holen Sie sich die Telefonnummer in Android mit TelephonyManager

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1- Android Phone number

Die  android.telephony.TelephonyManager  -Klasse enthält Informationen zu Telefoniediensten wie ID, EMEI Number, SIM Serial Number, Phone Network Type usw. Außerdem enthält sie Informationen zum Telefonstatus.
In diesem Artikel werde ich Sie anleiten, TelephonyManager zu verwenden, um die Telefonnummerninformationen des Android -Geräts und einige andere allgemeine Informationen abzurufen. 
Es ist erforderlich, dass die Anwendung die Berechtigung zum Anzeigen von Telefonstatusinformationen erhält. Daher müssen Sie der Datei AndroidManifest.xml die folgenden Berechtigungen hinzufügen:
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
 
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.o7planning.getphonenumberexample">

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
Hinweis: Ab Android 6.0 (API Level 23) möchte eine Anwendung den Status des Telefons wissen, das sie benötigt, um die Benutzerberechtigung zu erhalten .
Hier ist die Interface von Beispielsanwendung:
main_activity.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button_getInfo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="Get Phone Infos"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText_infos" />

    <EditText
        android:id="@+id/editText_infos"
        android:layout_width="0dp"
        android:layout_height="150dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:ems="10"
        android:gravity="top|left"
        android:hint="Phone Number"
        android:inputType="textMultiLine"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package org.o7planning.getphonenumberexample;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private static final int MY_PERMISSION_REQUEST_CODE_PHONE_STATE = 1;

    private static final String LOG_TAG = "AndroidExample";

    private EditText editTextPhoneNumbers;

    private Button buttonGetPhones;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        this.editTextPhoneNumbers = (EditText) this.findViewById(R.id.editText_infos);

        this.buttonGetPhones = (Button) this.findViewById(R.id.button_getInfo);

        this.buttonGetPhones.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                askPermissionAndGetPhoneNumbers();
            }
        });
    }

    private void askPermissionAndGetPhoneNumbers() {

        // With Android Level >= 23, you have to ask the user
        // for permission to get Phone Number.
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) { // 23

            // Check if we have READ_PHONE_STATE permission
            int readPhoneStatePermission = ActivityCompat.checkSelfPermission(this,
                    Manifest.permission.READ_PHONE_STATE);

            if ( readPhoneStatePermission != PackageManager.PERMISSION_GRANTED) {
                // If don't have permission so prompt the user.
                this.requestPermissions(
                        new String[]{Manifest.permission.READ_PHONE_STATE},
                        MY_PERMISSION_REQUEST_CODE_PHONE_STATE
                );
                return;
            }
        }
        this.getPhoneNumbers();
    }

    // Need to ask user for permission: android.permission.READ_PHONE_STATE
    @SuppressLint("MissingPermission")
    private void getPhoneNumbers() {
        try {
            TelephonyManager manager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);

            String phoneNumber1 = manager.getLine1Number();

            this.editTextPhoneNumbers.setText(phoneNumber1);

            //
            Log.i( LOG_TAG,"Your Phone Number: " + phoneNumber1);
            Toast.makeText(this,"Your Phone Number: " + phoneNumber1,
                    Toast.LENGTH_LONG).show();

            // Other Informations:
            if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) { // API Level 26.
                String imei = manager.getImei();
                int phoneCount = manager.getPhoneCount();

                Log.i(LOG_TAG,"Phone Count: " + phoneCount);
                Log.i(LOG_TAG,"EMEI: " + imei);
            }
            if(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.P) { // API Level 28.
                SignalStrength signalStrength = manager.getSignalStrength();
                int level = signalStrength.getLevel();

                Log.i(LOG_TAG,"Signal Strength Level: " + level);
            }

        } catch (Exception ex) {
            Log.e( LOG_TAG,"Error: ", ex);
            Toast.makeText(this,"Error: " + ex.getMessage(),
                    Toast.LENGTH_LONG).show();
            ex.printStackTrace();
        }
    }


    // When you have the request results
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        //
        switch (requestCode) {
            case MY_PERMISSION_REQUEST_CODE_PHONE_STATE: {

                // Note: If request is cancelled, the result arrays are empty.
                // Permissions granted (SEND_SMS).
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                    Log.i( LOG_TAG,"Permission granted!");
                    Toast.makeText(this, "Permission granted!", Toast.LENGTH_LONG).show();

                    this.getPhoneNumbers();

                }
                // Cancelled or denied.
                else {
                    Log.i( LOG_TAG,"Permission denied!");
                    Toast.makeText(this, "Permission denied!", Toast.LENGTH_LONG).show();
                }
                break;
            }
        }
    }


    // When results returned
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == MY_PERMISSION_REQUEST_CODE_PHONE_STATE) {
            if (resultCode == RESULT_OK) {
                // Do something with data (Result returned).
                Toast.makeText(this, "Action OK", Toast.LENGTH_LONG).show();
            } else if (resultCode == RESULT_CANCELED) {
                Toast.makeText(this, "Action Cancelled", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "Action Failed", Toast.LENGTH_LONG).show();
            }
        }
    }
}

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