How Can I Check If My Device Is Capable To Render Emoji Images Correctly?

I'm using Emoji unicode in a View. On most devices the images appear ok, but on one of my low-end device(android 2.3) they are rendered as little squares. Can I check whether the

Solution 1:

This is a late answer but I recently ran into a similar problem. I needed to filter through a List<String> and filter out emojis that couldn't be rendered on the device (i.e., if the device was old and didn't support rendering them).

What I ended up doing was using Paint to measure the text width.

PaintmPaint=newPaint();
privatebooleanemojiRenderable(String emoji) {
    floatwidth= mPaint.measureText(emoji);
    if (width > 7) returntrue;
    returnfalse;
}

The width > 7 part is particularly hacky, I would expect the value to be 0.0 for non-renderable emoji, but across a few devices, I found that the value actually ranged around 3.0 to 6.0 for non-renderable, and 12.0 to 15.0 for renderable. Your results may vary so you might want to test that. I believe the font size also has an effect on the output of measureText() so keep that in mind.

Overall I am not sure if this is a great solution but it's the best that I've come up with so far.

Solution 2:

please check the source code from Googles Mozc project. The EmojiRenderableChecker class seems to work pretty well! https://github.com/google/mozc/blob/master/src/android/src/com/google/android/inputmethod/japanese/emoji/EmojiRenderableChecker.java

it's like a compat version for Paint.hasGlypgh (added in Marshmallow). https://developer.android.com/reference/android/graphics/Paint.html#hasGlyph(java.lang.String)

Solution 3:

https://android.googlesource.com/platform/packages/inputmethods/LatinIME/+/master/java/src/com/android/inputmethod/keyboard/emoji/EmojiCategory.java#441

Inspired from the two methods found in the above file.

publicstaticbooleancanShowEmoji(String emoji) {
    Paintpaint=newPaint();
    floattofuWidth= paint.measureText("\uFFFE");
    floatstandardWidth= paint.measureText("\uD83D\uDC27");

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        return paint.hasGlyph(emoji);
    } else {
        floatemojiWidth= paint.measureText(emoji);
        return emojiWidth > tofuWidth && emojiWidth < standardWidth * 1.25;
        // This assumes that a valid glyph for the cheese wedge must be greater than the width// of the noncharacter.
    }
}