This you can do in OS version 4.6 and above.
Solution is :
EncodedImage mImage = EncodedImage.getEncodedImageResource("applicationI ndicatipor.png");
ApplicationIcon mIcon = new ApplicationIcon(mImage);
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance();
ApplicationIndicator indicator = reg.register(mIcon, false, true);
indicator.setValue(55);
//To change Icon
ApplicationIndicatorRegistry reg = ApplicationIndicatorRegistry.getInstance();
ApplicationIndicator appIndicator = reg.getApplicationIndicator();
appIndicator.setIcon(newIcon);
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