按钮的多种字体大小不起作用 [英] Multiple font size for button not working

问题描述

当我尝试在回收站视图中为按钮文本设置多种字体大小时，它无法正常工作.

When I tried to set multiple font sizes for button text inside a recycler view it is not working as expected.

我想做的是获取文本的第一个字母，使其稍大一点，添加换行符，然后输入实际文本，然后在按钮中设置整个文本.这是我尝试过的代码，但无法正常工作(大小未更改).

What I was trying to do is get the first letter of the text and make it a little bigger, add line break and then the actual text and set the whole text in the button.Here is the code I've tried, but is not working as expected (the size is not changing).

public void onBindViewHolder(final PopularCityViewHolder holder, int position) {
    if (shouldShowLoadingView()) return;
    PopularCity x = mItems.get(position);
    stringBuilder = new StringBuilder();
    stringBuilder.append(x.districtName.charAt(0));
    stringBuilder.append("\n\n");
    stringBuilder.append(x.districtName);

    SpannableString spannableString = new SpannableString(stringBuilder.toString());
    spannableString.setSpan(new RelativeSizeSpan(2.0f), 0,1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

    holder.mBtn.getLayoutParams().width = prefWidthAndHeight;
    holder.mBtn.getLayoutParams().height = prefWidthAndHeight;
    String[] colors = colorCodes.get(position).split(",");
    int bg = Color.rgb(Integer.parseInt(colors[0]), Integer.parseInt(colors[1]), Integer.parseInt(colors[2]));
    holder.mBtn.setBackgroundColor(bg);
    holder.mBtn.setText(spannableString);
}

此代码有什么问题?

推荐答案

尝试这个我的朋友

TextView tv= (TextView) findViewById(R.id.tv2);
    String title="Nilesh";

    final SpannableString spannableString = new SpannableString(title);
    int position = 0;
    for (int i = 0, ei = title.length(); i < ei; i++) {
        char c = title.charAt(i);
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9')) {
            position = i;
            break;
        }
    }
    spannableString.setSpan(new RelativeSizeSpan(2.0f), position, position + 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

    tv.setText(spannableString, TextView.BufferType.SPANNABLE);

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