Trying to receive SMS on emulator, but onReceive() is apparently not invoked

Question

I am trying to receive SMS's on my app, and I am testing on Android Studio's emulator. It seems to me that I have written what I had to write in order to receive them:

• I made sure the app is the default SMS app (through copying the sample code in an Android Developer blog tutorial),
• I put an intent filter for SMS_DELIVER_ACTION in the manifest, with the permission for BROADCAST_SMS and the priority set to 999,
• I created a class named SmsReceiver inheriting BroadcastReceiver, and put a onCreate(Context, Intent) function in it.

However, the receiver named SMSReceiver doesn't appear to be invoked when I send a SMS through the Emulator's extended controls... I do know they work, as, when the app Messages is the default SMS app, the SMS shows up in the notifications.)

The way I see it is that the Toast that I put in the onReceive function doesn't show up. I also put two breakpoints in the onReceive function in Android Studio, but they don't appear to be reached.

(The emulated device is a Pixel XL with API 26 / Android O. I am on macOS 10.13 High Sierra.)

What am I doing wrong?

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="st.thetechnologi.smscopy">

    <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"
        android:minSdkVersion="19">

        <receiver android:name=".SmsReceiver"
            android:enabled="true"
            android:permission="android.permission.BROADCAST_SMS">
            <intent-filter android:priority="999">
                <action android:name="android.provider.Telephony.SMS_DELIVER" />
            </intent-filter>
         </receiver>

        <!-- BroadcastReceiver that listens for incoming MMS messages -->
        <receiver android:name=".MmsReceiver"
            android:permission="android.permission.BROADCAST_WAP_PUSH">
            <intent-filter>
                <action android:name="android.provider.Telephony.WAP_PUSH_DELIVER" />
                <data android:mimeType="application/vnd.wap.mms-message" />
            </intent-filter>
        </receiver>

        <!-- Activity that allows the user to send new SMS/MMS messages -->
        <activity android:name=".ComposeSmsActivity" >
            <intent-filter>
                <action android:name="android.intent.action.SEND" />
                <action android:name="android.intent.action.SENDTO" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="sms" />
                <data android:scheme="smsto" />
                <data android:scheme="mms" />
                <data android:scheme="mmsto" />
            </intent-filter>
        </activity>

        <!-- Service that delivers messages from the phone "quick response" -->
        <service android:name=".HeadlessSmsSendService"
            android:permission="android.permission.SEND_RESPOND_VIA_MESSAGE"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.intent.action.RESPOND_VIA_MESSAGE" />
                <category android:name="android.intent.category.DEFAULT" />
                <data android:scheme="sms" />
                <data android:scheme="smsto" />
                <data android:scheme="mms" />
                <data android:scheme="mmsto" />
            </intent-filter>
        </service>

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".DisplayMessageActivity"
            android:parentActivityName=".MainActivity" >
         </activity>
    </application>

</manifest>

SmsReceiver.java

package st.thetechnologi.smscopy;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

/**
 * Created by l on 10/22/17.
 */

public class SmsReceiver extends BroadcastReceiver {
    private static final String TAG = "SmsReceiver";
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, TAG, Toast.LENGTH_LONG).show();
    }
}

Thank you!

EDIT: OK, I needed to grant the SMS permission manually from Settings to my app. Thanks to Mike M. to put me on the right trail!