Map of -webkit-min-device-pixel-ratio/-webkit-max-device-pixel-ratio values to Android/iOS screen density levels. Useful for mobile hybrid (Ionic, ReactNative, NativeScript and so on) frameworks based on web development assets dimensioning.

webkit-device-pixel-ratio_to_android-density.scss

/* Example of a CSS class to use to show the asset */

/** Ionic example
<ion-grid align="center">
  <ion-row justify-content-center>
        <ion-col col-8 align-self-baseline>
          <div class="camera-icon"></div>
        </ion-col>
  </ion-row>
</ion-grid>
**/

.camera-icon {
  background-repeat: no-repeat !important;
  background-size: contain !important;
  width: <width>px !important;
  height: <height>px !important;
  display: inline-block !important;
}

/* Android ldpi */
@media screen and (-webkit-max-device-pixel-ratio: 0.9) {
  .camera-icon {
    background: url("../assets/camera-icon/camera-icon-ldpi.png");
  }
  
}

/* Android mdpi */
@media screen and (-webkit-min-device-pixel-ratio: 1) and (-webkit-max-device-pixel-ratio: 1) {
  .camera-icon {
    background: url('../assets/camera-icon/camera-icon-mdpi.png');
  }
}

/* Android hdpi */
@media screen and (-webkit-min-device-pixel-ratio: 1.1) and (-webkit-max-device-pixel-ratio: 1.5) {
  .camera-icon {
    background: url('../assets/camera-icon/camera-icon-hdpi.png');
  }
}

/* Android xhdpi | iPhones 4, 4S, 5, 5C, 5S, 6, 7, 8 */
@media screen and (-webkit-min-device-pixel-ratio: 1.6) and (-webkit-max-device-pixel-ratio: 2) {
  .camera-icon {
    background: url('../assets/camera-icon/camera-icon-xhdpi.png');
  }
}

/* Android xxhdpi | iPhones 6 Plus, 7 Plus, 8 Plus, X */
@media screen and (-webkit-min-device-pixel-ratio: 2.1) and (-webkit-max-device-pixel-ratio: 3) {
  .camera-icon {
    background: url('../assets/camera-icon/camera-icon-xxhdpi.png');
  }
}

/* Android xxxhdpi */
@media screen and (-webkit-min-device-pixel-ratio: 3.1) and (-webkit-max-device-pixel-ratio: 4) {
  .camera-icon {
    background: url('../assets/camera-icon/camera-icon-xxxhdpi.png');
  }
}

Credits to this stackoverflow answer: https://stackoverflow.com/a/51646690/5797426