BitmapUtil.java 文件源码

private static Bitmap getEmoji(
        Context context, String emoji, @DimenRes int sizeResId, @DimenRes int insetResId) {
    if (context == null || TextUtils.isEmpty(emoji)) {
        return null;
    }
    int size = context.getResources().getDimensionPixelSize(sizeResId);
    int inset = context.getResources().getDimensionPixelSize(insetResId);
    Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    paint.setStyle(Paint.Style.FILL);
    paint.setTextAlign(Paint.Align.LEFT);
    paint.setTextSize(size);
    float baseline = -paint.ascent();
    int width = (int) (paint.measureText(emoji) + 0.5f);
    int height = (int) (baseline + paint.descent() + 0.5f);
    Bitmap bitmap = Bitmap.createBitmap(width + inset * 2, height + inset * 2, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    canvas.drawText(emoji, inset, baseline + inset, paint);
    return bitmap;
}