android - 通过参数将 Spannable 应用于 string.xml 中的字符串

Question

我在 string.xml

中定义了以下字符串

<string name="photo_heading"><xliff:g name="name">%s</xliff:g> shared a <xliff:g name="permission">%s</xliff:g><xliff:g name="photo">%s</xliff:g> with you.</string>

String接受3个字符串参数:name, permission, photo

我有两种设置不同样式的方法。

public Spannable getStyledItalic(String text) {
        Spannable sb = new SpannableString(text);
        sb.setSpan(new StyleSpan(Typeface.ITALIC), 0, text.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        return sb;
    }

和

public Spannable getStyledName(String name) {
        Spannable sb = new SpannableString(name);
        sb.setSpan(new AbsoluteSizeSpan(LPConstants.FONT_SIZE_NAME), 0, name.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        sb.setSpan(new StyleSpan(Typeface.BOLD), 0, name.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        sb.setSpan(new ForegroundColorSpan(mContext.getResources().getColor(R.color.app_primary)), 0, name.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

        return sb;
    }

现在我将这些样式应用于不同的参数并返回字符串，但这不起作用。这是我正在做的:

public String getHeading(Printrequest printRequest) {
        String name = printRequest.sentbyname;
        String permission;
        String photo;
        if (printRequest.mediaobject.permission != null && !printRequest.mediaobject.permission.equalsIgnoreCase("public")) {
            permission =  printRequest.mediaobject.permission;
        } else {
            permission = "";
        }
        if (printRequest.mediaobject.hyperphoto != null) {
            photo = " " + getStyledItalic(mContext.getString(R.string.hyperphoto));
        } else {
            photo = " " + mContext.getString(R.string.photo);
        }

        String heading = mContext.getString(R.string.photo_heading, getStyledName(name), getStyledItalic(permission), photo);

        return heading;
    }

我知道我们可以将 Spannable 与 TextUtils.concat(...) 连接起来，但我的情况不同。

解决方案

请检查以下解决方案。 @Krislarson 解决方案也是另一种方法。

Answer 1

下面是如何使用 SpannableStringBuilder 来做到这一点。请注意，返回类型已更改为 CharSequence 以适应构建的 Spannable 字符串。您可以将返回值直接传递给 TextView.setText()。

    public CharSequence getHeading(Printrequest printRequest) {
        String name = printRequest.sentbyname;
        String permission;
        if (printRequest.mediaobject.permission != null && !printRequest.mediaobject.permission.equalsIgnoreCase("public")) {
            permission =  printRequest.mediaobject.permission;
        } else {
            permission = "";
        }

        String photoHeading = mContext.getString(R.string.photo_heading);
        SpannableStringBuilder builder = new SpannableStringBuilder(photoHeading);

        int pos = builder.toString().indexOf("%s");
        builder.replace(pos, pos+2, getStyledName(name));
        pos = builder.toString().indexOf("%s");
        builder.replace(pos, pos+2, getStyledItalic(permission));
        pos = builder.toString().indexOf("%s");
        if (printRequest.mediaobject.hyperphoto != null) {
            builder.replace(pos, pos+2, getStyledItalic(mContext.getString(R.string.hyperphoto)));
            builder.insert(pos, " ");
        } else {
            builder.replace(pos, pos+2, mContext.getString(R.string.photo));
            builder.insert(pos, " ");
        }

        return builder;
    }