Here's how to create image resources for Android API 26 using CapacitorJS:

1. Make sure you have already installed the `@capacitor/ionic-native` package in your project.

2. Next, make sure that you are running a compatible version of Cordova (`>=6.0`) and Ionic (4.x or higher).

3. Now, add this line at the beginning of ` capacitor.config.js`:

import { AppIcon} from '@capacitor/ionic-native';

4. To generate the icon and splash resources for Android using CapacitorJS you just need to run:

```bash

npx cap add android --path ./src/res

```

5. Finally, make sure that in your `android/app/src/main/ic_launcher.xml` file there are these lines inside of the `` tag:

```xml

```

6. That's it! Now you can run again with:

```bash

npx cap build android --release

```

In this way, all necessary icons and splashscreens will be generated for your Android application automatically.

If not, do the following steps manually:

1.- Create a new folder called `src/res` inside of your project's root directory.

2.- Inside that new folder create another one called `android`.

3.- Inside the previous android folder create these folders:

- drawable

- hdpi

- logo.png

- mdpi

- logo.png

- xxhdpi

- logo.png

xhdpi:

- icon.png

4. Finally, inside the `src/res/android/drawable` folder create these three files:

- android_launcher_foreground.xml (it's just a copy from your project root directory)

- androidlauncher_background.png

Generate app icon android studio