Create android notification icon

How to create Android Notification icons — Dev Simplified

Sep 5 · 3 min read

This article to gives the inside details of how Android notification icon behaves in React Native mobile applications and how to make sure your notification icon works perfectly.

At the end of this Article, you will be able to understand different scenarios/issues you may face and how to fix them and how to create your notification icon the way you want.

Let’s get started

We were recently working on implementing push notifications for our mobile application in React Native using React Native Push Notifications (link) and React Native Push notifications iOS.

We implement e d the push notifications, it started working smoothly in both Android and iOS, in all 3 scenarios (Notifications when app is running, app is in background or App is killed).

But one thing we noticed with Android was, the app icon that appears in Android Status bar and at the top left corner of the notification window was showing in Grey color.

How we tracked down the root cause?

We looked into the official material design Android documentation, searched different articles and found, the Android notification icon must be completely transparent with white icon/text etc.

So icon must be completely white with transparent background? But how come other applications are showing the coloured icons?

After checking the source code of React Native Push Notifications library, we found
1. Library first checks if there is any icon sent by FCM in notification payload, otherwise,
2. It looks for the icon named ic_notification in app/mimmap-* folders and
3. Finally, if it doesn’t find any of these, library uses ic_launcher icon to show the notification icon.

Is that the only trick here? For sure NO 🙂

Even though you add a transparent ic_notification icon, Android behaves different based on its states.

If Android app is running, it picks ic_notification icon, but if App is in background or not running, then it again picks ic_launcher icon.

So, how do we make sure our Android app shows the ic_notification icon, which is transparent all times?

Actual Solution to show the perfect notification icon

There are 2 ways, you can handle this.

1. Adding default notification icon from Android Manifest

While checking Firebase cloud messaging guide, we found that, we can add a default icon in the Android manifest that will be used for push notifications if server does not pass the notification icon.

So, we added the default Android notification icon as meta-data for Android in AndroidManifest.xml like this:

Adding Colors to notification icon:

Now we fixed issue of app icon not showing in Android notifications, but still our app was not showing the color in the app icon.

To add color to the Android notification icon, we found another meta-data property from Firebase Cloud Messaging guide:

2. Sending the notification icon from Remote Notification Payload:

If you are using Remote notifications, you can also send the notification icon through notification payload from server. This also allows mobile apps to show different notification icons based on type and category of notifications.

How to create notification icon:

When creating notification, if you want to use colors in the notification icon, please make sure to keep the view in WHITE color that you want to have the color and remaining in transparent color.

Hope this article helps you understand the nitty gritty of how to design the notification icon for Android applications.

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How to Create Android App Icons using Image Asset Studio

Creating an application interface that the user will like and will be unlikely to forget can be intimidating. But creating an attractive launcher icon for your app, that the user will first come across while looking at your app, anyway needs more brainstorming. For Android, you need to create these graphics that have to be compatible and supporting to all devices running Android, sizes varying from a smartphone to TV. The introduction of Android Image Asset Studio in Android Studio has made it easy. In this article, you will see how you can easily create your application icon in one go.

Image Asset Studio is a tool introduced in Android Studio 3. It can be used to generate app icons for all the screen densities in one go, using custom images, material design icons as well as text strings. Application icon in Android includes the following,

• Launcher Icon: represents your app and the first thing that user sees
• ActionBar Icon & Tab Icon: representing actions in the ActionBar and Tabs of the app
• Notification Icon: represents your app notification when a user is outside your app

Here is a list of icon/image sizes that you need to create for different screen densities, for each image that you use in your application. No matter if you are a good designer, creating each of these is tedious!

Image Asset Studio helps to create all these icons for all screen densities and stores them in respective density folders. It provides a preview of all the icons that will be created, in different shapes, with options to edit them. Let’s see how to create each one of them.

Run Image Asset Studio

1. In the Project Window, select the project hierarchy.
2. Right-click on the res folder and choose New -> Image Asset.

3. Create the icon for your app i.e.

• Launcher icon which may be Adaptive and Legacy Launcher Icon (if your app supports Android 8.0 or above) or just the Legacy Launcher Icon(for Android version less than or equal to 7.1)
• ActionBar Icons and Tab Icons
• notification icon as per your requirement.

4. You can select the following Asset Type. The icon appears on the right side, in the preview panel.

Custom Image

You can use custom images of PNG (recommended), JPG or GIF (avert) format and adjust it to create icons. Set the path of your custom image if you select this.

Clip Art

You can select the icons from the list of Google Material Design Icons provided in the dialog. Click on the clip art icon to get the dialog with icon set.

Text String

You can use the fonts installed on your computer to generate the icons out of the text strings. It will create these text-based icons in PNG format in respective drawable-density folders. Set the string and select the font to use it.

If you are comfortable learning from video, you can refer to this for Launcher Icons and App Bar Icons:

Creating Launcher Icon

Launcher Icons represent our app in the device home screen, on the app list screen, in the Google Play Store and everywhere else. Android 8.0 (Oreo) and above supports Adaptive Icons and can be displayed in different shapes across various platforms. Image Asset Studio provides the option to create these adaptive icons as well as the legacy icons for Android 8.0 below. It also creates web icons(512 x 512 px) that represents our app on the Google Play Store.

The Launcher Icons are stored in the res/mipmap-density folder.

Adaptive and legacy launcher icon

If your app doesn’t support android version 8.0 or above, create legacy icon only for your app.

After opening Image Asset Studio, follow the steps below to create the legacy icons for your android app.

1. For Icon Type field, select Launcher Icons (Adaptive & Legacy).
2. For Foreground Layer tab, select the Asset type to be an image, clip art or text.
3. Then for the Background Layer tab, select a Color or set the Image path for the Asset type to set the background.
4. Then the Legacy tab, check the default settings. You can choose whether you want to generate the legacy icon, round icon and the icon for the web(Google Play Store Icon).
5. Optionally

• Name: Change the name of the foreground and background layer. If the resource with the specified name exists, it will be indicated by an error message. The name can contain lowercase characters, digits and underscore only.
• Trim: Chose yes to adjust the margin between the foreground icon graphic and the background, else select no to keep the source asset as it is.
• Color: Set the color for the clip art or the text asset. Click the field, select the color, click chose and preview your icon.
• Resize: Use the slider to resize your icon. It is disabled for background layer where Color is the asset type.

7. Chose the resource directory for your image asset.

• main/res: For all source set including debug and release
• debug/res: For debugging only
• release/res: For only one version of build, overrides main source set
• custom source set: To define a new source set File -> Project structure -> app -> Build Types. Refer to Configure Build Variants for details
  Output Directories shows the list of folders in which the icons will be created in the Project view in Project Window.

Check the mipmap folders for the Launcher Icons.

Legacy launcher icon only

If your app supports android version 8.0 or above, create adaptive and legacy launcher icon for your app.

After opening Image Asset Studio, follow the steps below to create adaptive and legacy icons for your android app.

1. For Icon Type field, select Launcher Icons (Legacy Only).
2. Select the Asset type to be an image, clip art or text.
3. Optionally

• Name: Change the name of the icon if you don’t want to use the default name. If the resource with the specified name exists, an error message will indicate it. The name can contain lowercase characters, digits and underscore only.
• Trim: Chose yes to adjust the margin between the foreground icon graphic and the background, else select no to keep the source asset as it is.
• Padding: Adjust the source set padding for all four sides. You will have the review on the right side.
• Foreground: Set the color for the clip art or the text asset. Click the field, select the color, click chose and preview your icon.
• Background: Set the color for the background. Click the field, select the color, click chose and preview your icon.
• Scaling: Select crop or S hrink to fit to fit the icon size
• Shape: Select the shape to set a backdrop for the icon. For transparent, select none.
• Effect: Select dogear if you want the dogear effect for your icon, else select none.

5. Chose the resource directory for your image asset.

• main/res: For all source set including debug and release
• debug/res: For debugging only
• release/res: For only one version of the build, overrides main source set
• custom source set: To define a new source set File -> Project structure -> app -> Build Types. Refer to Configure Build Variants for details

Check the mipmap folders for the Launcher Icons.

Creating ActionBar Icons and Tab Icons

ActionBar icons are the ones present on the ActionBar that represents individual action. Whereas, the tab icons are used in the apps having multiple tabs. Using material icons for this category is recommended.

The ActionBar and Tab Icons are stored in the res/drawable-density folder.

You can also use Vector Asset Studio to have XML vectors for these categories of icons. It will reduce the size of your APK considerably.

After opening Image Asset Studio, follow the steps below to create action bar and tab icons for your android app.

1. For Icon Type field, select Action Bar and Tab Icons.
2. Select the Asset type to be an image, clip art or text.
3. Optionally

• Name: Change the name of the icon if you don’t want to use the default name. If the resource with the specified name exists, an error message will indicate it. The name can contain lowercase characters, digits and underscore only.
• Trim: Chose yes to adjust the margin between the foreground icon graphic and the background, else select no to keep the source asset as it is.
• Padding: Adjust the source set padding for all four sides. You will have the review on the right side.
• Theme: Select holo_light or holo_dark as per your app theme. Select custom to set a custom color for the icon.

5. Chose the resource directory for your image asset.

• main/res: For all source set including debug and release
• debug/res: For debugging only
• release/res: For only one version of build, overrides main source set
• custom source set: To define a new source set File -> Project structure -> app -> Build Types. Refer to Configure Build Variants for details

Check the drawable folders for the Icons created.

Creating Notification icons

To learn from the video:

The user sees the notification when he is outside your app. Notification icons come up with these notifications.

The Notification Icons are stored in the res/drawable-density folder. There are a few other folders created too.

• for Android 2.2 (API 8) or lower — icons stored in res/drawable-density
• for Android 2.3 to 2.3.7 (API 9 & 10) — icons stored in res/drawable-density-v9. Gray version of the icon is created
• Android 3 (API 11) or higher — icons stored in res/drawable-density-v11. A white version of the icon is created.

After opening Image Asset Studio, follow the steps below to create notification icons for your android app.

1. For Icon Type field, select Notification Icons.
2. Select the Asset type to be an image, clip art or text.
3. Optionally

• Name: Change the name of the icon if you don’t want to use the default name. If the resource with the specified name exists, an error message will indicate it. The name can contain lowercase characters, digits and underscore only.
• Trim: Chose yes to adjust the margin between the foreground icon graphic and the background, else select no to keep the source asset as it is.
• Padding: Adjust the source set padding for all four side. You will have the review on the right side.

5. Chose the resource directory for your image asset.

• main/res: For all source set including debug and release
• debug/res: For debugging only
• release/res: For only one version of build, overrides main source set
• custom source set: To define a new source set File -> Project structure -> app -> Build Types. Refer to Configure Build Variants for details

Check the drawable folders for the Icons created.

How to Delete an App Icon from a project

To delete the app icon,

1. Select Android View in Project Window
2. Expand the mipmap and drawable folder for the launcher and other icons respectively.
3. Select the sub-folder that matched the name of your icon. It contains the icons of all densities that you created.
4. Right-click on the sub-folder and hit delete.
   Dialog for Safe Delete appears.
5. If you want, select options to find the places where the icon is used and hit OK.
   If you chose to search for usage and the icon has any use in the project, you can view it and then confirm delete. You should delete or replace this reference to successfully compile the project. Android Studio then deletes the file from the project and the drive.
6. Chose Build -> Clean Project.

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