push noification icon with android 5+

For the icon shown in the notification bar when receiving a push notification on mobile phones, there was used the standard icon of the particular app by default.

Since Android 5 the icon has to be specified and send within the notfication‘s payload.

Therefore we need a png file with transparency, with a resolution of 192×192 pixels and a specific name.

For example „fcm_push_icon.png“

This icon needs to be stored into the ressources. To be more precise, into all folders containing the size specific app icons /res/mipmap-hdpi, /res/mipmap-ldpi and so on…

Now we need to modify the payload on server side and to specify the attributes „icon“ (name of the png) and „color“ for the background color in hex values.

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