离子通知应用程序图标问题

Question

我正在使用ionic 3.2构建一个ionic应用程序，我面临的主要问题是fcm通知图标。我正在使用fcm-node库从服务器发送通知。我试图从过去的问题中找出并应用所有问题，包括：

notification: {
    title: title,
    body: messagetosend,
    sound: "default",
    icon: 'icon',
    click_action: "FCM_PLUGIN_ACTIVITY"
}

，然后在res / drawable文件夹中添加icon.png。还尝试过使用具有透明背景的96 * 96大小，但是我只是将android默认图标作为通知图标。

这是config.xml文件中我的android平台配置：

<platform name="android">
   <allow-intent href="market:*" />
   <icon density="ldpi" src="resources/android/icon/drawable-ldpi-icon.png" />
   <icon density="mdpi" src="resources/android/icon/drawable-mdpi-icon.png" />
   <icon density="hdpi" src="resources/android/icon/drawable-hdpi-icon.png" />
   <icon density="xhdpi" src="resources/android/icon/drawable-xhdpi-icon.png" />
   <icon density="xxhdpi" src="resources/android/icon/drawable-xxhdpi-icon.png" />
   <icon density="xxxhdpi" src="resources/android/icon/drawable-xxxhdpi-icon.png" />
   <splash density="land-ldpi" src="resources/android/splash/drawable-land-ldpi-screen.png" />
   <splash density="land-mdpi" src="resources/android/splash/drawable-land-mdpi-screen.png" />
   <splash density="land-hdpi" src="resources/android/splash/drawable-land-hdpi-screen.png" />
   <splash density="land-xhdpi" src="resources/android/splash/drawable-land-xhdpi-screen.png" />
   <splash density="land-xxhdpi" src="resources/android/splash/drawable-land-xxhdpi-screen.png" />
   <splash density="land-xxxhdpi" src="resources/android/splash/drawable-land-xxxhdpi-screen.png" />
   <splash density="port-ldpi" src="resources/android/splash/drawable-port-ldpi-screen.png" />
   <splash density="port-mdpi" src="resources/android/splash/drawable-port-mdpi-screen.png" />
   <splash density="port-hdpi" src="resources/android/splash/drawable-port-hdpi-screen.png" />
   <splash density="port-xhdpi" src="resources/android/splash/drawable-port-xhdpi-screen.png" />
   <splash density="port-xxhdpi" src="resources/android/splash/drawable-port-xxhdpi-screen.png" />
   <splash density="port-xxxhdpi" src="resources/android/splash/drawable-port-xxxhdpi-screen.png" />
</platform>

这是我的应用程序图标：

以下是输出：