GCM Push Notification Large Icon size

Question

Hi Iam implementing Push Notifications in Android using GCM. I am trying to set an image for the notification instead of the default app icon. I am able to achieve this usin

Answer 1

I was having the same problem. This is how I solve it:

First you need to know the max sizes of the notification icon depending of the device resolution. Searching, I found this:

• ldpi: 48x48 px *0.75
• mdpi: 64x64 px *1.00
• hdpi: 96x96 px *1.50
• xhdpi: 128x128 px *2.00
• xxhdpi: 192x192 px *3.00

There are 2 approach:

• One is having a set of images in those dimension in the server, and get them depending of your device resolution.
• The other one is having the larger image in the server and resize it in the app depending of your device resolution.

I will explain to you the second one that I implement.

First for get the Image from an URL I use this:

public Bitmap getBitmapFromURL(String strURL) {
    try {
        URL url = new URL(strURL);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setDoInput(true);
        connection.connect();
        InputStream input = connection.getInputStream();
        Bitmap myBitmap = BitmapFactory.decodeStream(input);
        return myBitmap;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    }
}

Then I need to know the factor for the new image size. I know that in the server I have the xxhdpi image with a factor of *3.00, I use that for get the global factor:

public static float getImageFactor(Resources r){
      DisplayMetrics metrics = r.getDisplayMetrics();
      float multiplier=metrics.density/3f;
      return multiplier;
  }

Now I have to resize the image size and set the new bitmap in the notification icon:

Bitmap bmURL=getBitmapFromURL(largeIcon);
float multiplier= getImageFactor(getResources());
bmURL=Bitmap.createScaledBitmap(bmURL, (int)(bmURL.getWidth()*multiplier), (int)(bmURL.getHeight()*multiplier), false);
if(bmURL!=null){
    mBuilder.setLargeIcon(bmURL);
}           

This work for me. I hope you can use it.