Check if custom font can display character

Question

I have a custom font which is displaying the box character. The font I am using does not support all languages apparently. I want to check if the String I am about to displa

Answer 1

@nibarius answer works well, though with a different character: "\u2936".

However, that solution is heavy in memory, cpu and time. I needed a solution for a very small number of characters so I implemented a "quick and dirty" solution by checking only the bounds. It works about 50x times faster, so it is more suitable for my case:

public boolean isCharGlyphAvailable(char... c) {
      Rect missingCharBounds = new Rect();
      char missingCharacter = '\u2936';
      paint.getTextBounds(c, 0, 1, missingCharBounds); // takes array as argument, but I need only one char.
      Rect testCharsBounds = new Rect();
      paint.getTextBounds(c, 0, 1, testCharsBounds);
      return !testCharsBounds.equals(missingCharBounds);
}

I should warn that this method is less accurate than @nibarius, and there are some false negatives and false positives, but if you just need to test a few characters in order to be able to fallback to other characters - this solution is great.