字符串中带有emoji表情处理

Posted 2020-08-08 梦见一只

1：先删除字符然后解析当前字符再显示

edit.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
    }

    @Override
    public void afterTextChanged(Editable s) {
        send.setEnabled(!s.toString().isEmpty());
        int start = edit.getSelectionStart();
        int end = edit.getSelectionEnd();
        edit.removeTextChangedListener(this);
        CharSequence cs = EmojiManager.parse(s.toString(), edit.getTextSize());
        Toast.makeText(login.this,cs.toString(),Toast.LENGTH_SHORT).show();
        edit.setText(cs, TextView.BufferType.SPANNABLE);
        edit.setSelection(start, end);
        edit.addTextChangedListener(this);
    }
});
2：解析方法  判断每个字符的是否为表情然后做处理

public static CharSequence parse(String text, float textSize) {
    if (text == null) {
        return "";
    }
    //将字符串转换为数组
    final char[] chars = text.toCharArray();
    final SpannableStringBuilder ssb = new SpannableStringBuilder(text);

    int codePoint;
    boolean isSurrogatePair;
    for (int i = 0; i < chars.length; i++) {
        if (Character.isHighSurrogate(chars[i])) {
            continue;
        } else if (Character.isLowSurrogate(chars[i])) {
            if (i > 0 && Character.isSurrogatePair(chars[i - 1], chars[i])) {
                codePoint = Character.toCodePoint(chars[i - 1], chars[i]);
                isSurrogatePair = true;
            } else {
                continue;
            }
        } else {
            codePoint = (int) chars[i];
            isSurrogatePair = false;
        }

        if (emojiCodeList.contains(codePoint)) {
            Bitmap bitmap = BitmapFactory.decodeResource(gContext.getResources(), getResourceByCode(codePoint));
            BitmapDrawable bmpDrawable = new BitmapDrawable(gContext.getResources(), bitmap);
            bmpDrawable.setBounds(0, 0, (int) textSize, (int) textSize);
            CenterImageSpan imageSpan = new CenterImageSpan(bmpDrawable);
            ssb.setSpan(imageSpan, isSurrogatePair ? i - 1 : i, i + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        }
    }
    return ssb;
}

private static class CenterImageSpan extends ImageSpan {

    public CenterImageSpan(Drawable draw) {
        super(draw);
    }

    @Override
    public void draw(Canvas canvas, CharSequence text, int start, int end, float x,
                     int top, int y, int bottom, Paint paint) {
        Drawable b = getDrawable();
        Paint.FontMetricsInt fm = paint.getFontMetricsInt();
        int transY = ((bottom - top) - getDrawable().getBounds().bottom) / 2 + top;
        canvas.save();
        canvas.translate(x, transY);
        b.draw(canvas);
        canvas.restore();
    }
}