Firebase 通知为灰色 flutter

Question

I'm using Firebase Cloud Messaging to send notifications to my Flutter app. It works fine but my app icon notification is grey on the Google Pixel XL. I can see the outline, but for some reason, it's still grey. I've read in different articles that it has to do with the Android SDK level, but the minSdkVersion in Flutter is already 16 (less than 21) so I don't understand why the color won't show on.

So is it possible to show my app icon for notifications with the color?

--Thanks in advance

Answer 1

Here you can read:

Customize default notification

Custom default icon

Setting a custom default icon allows you to specify what icon is used for notification messages if no icon is set in the notification payload. Also use the custom default icon to set the icon used by notification messages sent from the Firebase console. If no custom default icon is set and no icon is set in the notification payload, the application icon (rendered in white) is used.

Custom default Color

You can also define what color is used with your notification. Different android versions use this settings in different ways: Android < N use this as background color for the icon. Android >= N use this to color the icon and the app name.

Try putting that in your AndroidManifest.xml

<!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->
<meta-data
    android:name="com.google.firebase.messaging.default_notification_icon"
    android:resource="@drawable/ic_stat_ic_notification" />
<!-- Set color used with incoming notification messages. This is used when no color is set for the incoming notification message.  -->
<meta-data
    android:name="com.google.firebase.messaging.default_notification_color"
    android:resource="@color/colorAccent" />

You can find more info here .

You also need to have your colorAccent define. You can create a colors.xml file in your res folder like that:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorAccent">#E91E63</color>
</resources>

In this folder: /android/app/src/main/res/values

Also the icon must be in the drawable folder.

But remember that this icon must be white with a transparent background .

For some type of icons to be colored you need on some device sets meta-tags you already added in yuor AndroidManifest.xml and your icon must follow some specifications (must be white in a transparent background). You can try to generate one here . Give it a try. Remember to put it on drawable folder and update the manifest meta-tag icon name.

Read also this SO question that stengthens up what I've said here.

I've tried on the Pixel 2 emulator running API level 27:

Hope it helps.

Answer 2

I know this question is regarding Firebase notification but since on searching the same for local_notifiction grey icon error this post came ...so finally I was able to find the solution to that(in my case icons work fine in debug mode but on building apk icons become grey boxes)

Solution:- in Android/app/src/main/res create a new directory named raw and in that directory add a file named keep.xml and copy paste the following:-

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:tools="http://schemas.android.com/tools"
    tools:keep="@drawable/*" />

Answer 3

I did the following and it worked for me:

1. Create a transparent and white notification icon (you can use the following tool: AndroidAssetStudio )

Download the zip folder, unzip and you'll see it contains a res folder with different drawable folders. Copy and paste the contents of the res folder in "android\\app\\src\\main\\res" path

2. Then open the AndroidManifest.xml file and add the following lines to it:

ic_stat_calendar_today is the name of my notification icon. And each of the drawable folders that have been pasted contain a different size of icon with the same name.

3. If you want to change the color of the icon then check the above image. Add the metadata tag after the notification icon tag

4. Go to "android\\app\\src\\main\\res\\values" and add a colors.xml file

<color name="colorAccent">#00FF00</color>

I have shared this answer in the following Github chain as well- Solution .

Answer 4

Majority are making one single problem.

They are placing the meta tags

<meta-data
           android:name="com.google.firebase.messaging.default_notification_icon"
           android:resource="@drawable/ic_notification" />
       <meta-data
           android:name="com.google.firebase.messaging.default_notification_color"
           android:resource="@color/colorAccent" />

Inside the tags while they should be placing it above and inside the <application tag fe

    package="xxxx">
   <application
        android:label="xxxx"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher">
       <meta-data
           android:name="com.google.firebase.messaging.default_notification_icon"
           android:resource="@drawable/ic_notification" />
       <meta-data
           android:name="com.google.firebase.messaging.default_notification_color"
           android:resource="@color/colorAccent" />
        <activity
            android:name="xxxx"
            android:exported="true"
            android:launchMode="singleTask"
            android:theme="@style/LaunchTheme"
            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
            android:hardwareAccelerated="true"
            android:windowSoftInputMode="adjustResize">
            <!-- Specifies an Android theme to apply to this Activity as soon as
                 the Android process has started. This theme is visible to the user
                 while the Flutter UI initializes. After that, this theme continues
                 to determine the Window background behind the Flutter UI. -->
            <meta-data
              android:name="io.flutter.embedding.android.NormalTheme"
              android:resource="@style/NormalTheme"
              />
            <meta-data
                android:name="com.google.android.gms.wallet.api.enabled"
                android:value="true" />
            <!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
            <intent-filter android:autoVerify="true">
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="flutterstripe" android:host="safepay" />
                <data
                    android:scheme="https"
                    android:host="xxxxx" />
            </intent-filter>
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT"/>
            </intent-filter>
        </activity>
        <!-- Don't delete the meta-data below.
             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
        <meta-data
            android:name="flutterEmbedding"
            android:value="2" />
    </application>
```` </manifest>


Also its important to create separate file colors.xml and include color of your choice.
```` <?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="splash_color">#00ABC8</color>
 </resources>



Rebuild app (close and run again)

and it will work.

Answer 5

add this in android/app/build.gradle in section "buildTypes" if not show icon only in release:

shrinkResources false

buildTypes {
    release {
        shrinkResources false  //  <------------

    }
}

Answer 6

In my case, the issue was that I was placing the

<meta-data android:name="com.google.firebase.messaging.default_notification_icon" … />

tag under the main <activity/> tag in the AndroidManifest.xml

Apparently, it should be under the <application/> tag (higher in the hierarchy).

Answer 7

For anyone who is still having problems after adding the:

<meta-data android:name="com.google.firebase.messaging.default_notification_icon" … />

Please make sure you are adding it directly under <application/> tag, instead of an <activity/> tag, in the AndroidManifest.xml

Answer 8

Here is my finding.

1. Use AndroidAssetStudio to generate notification icon.

2. Try putting that in your AndroidManifest.xml

<!-- Set custom default icon. This is used when no icon is set for incoming notification messages. -->
<meta-data
    android:name="com.google.firebase.messaging.default_notification_icon"
    android:resource="@drawable/ic_stat_ic_notification" />
<!-- Set color used with incoming notification messages. This is used when no color is set for the incoming notification message.  -->
<meta-data
    android:name="com.google.firebase.messaging.default_notification_color"
    android:resource="@color/colorAccent" />

Note: Above changes should be below <application> not in <activity> .

3. Also check the minSdkVersion. When i use minSdkVersion 20 it was not working and when i set to minSdkVersion 21 it was work fine.