Android Studio Broadcast Programming - android-studio

Question

I am learning to develop apps for Android but I am stuck with this topic:
https://www.tutorialspoint.com/android/android_broadcast_receivers.htm
I have visited numerous sites with examples, downloaded source code and tried in two different computers with Android Studio and tried in a virtual and physical device, but I can't figure out where the problem is.
MANIFEST
<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>
<receiver android:name=".MyReceiver" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.AIRPLANE_MODE" />
<action android:name="android.intent.action.TIME_TICK" />
<action android:name="com.example.myapplication.TEST_BROADCAST" />
</intent-filter>
</receiver>
</application>
MyReceiver.java
public class MyReceiver extends BroadcastReceiver{
String logPrefix = "Android : ";
#Override
public void onReceive(Context context, Intent intent) {
Log.d(logPrefix, "Broadcast received");
Toast.makeText(context, "Intent Detected.", Toast.LENGTH_LONG).show();
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
String logPrefix = "Android : ";
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(logPrefix, "The onCreate() event");
}
public void broadcastIntent(View view){
Log.d(logPrefix, "Sending broadcast...");
Intent intent = new Intent("com.example.myapplication.TEST_BROADCAST");
sendBroadcast(intent);
}
}