Kotlin Spannable

实例

private val spannables = listOf("增大字号", "加粗字体", "前景红色", "背景绿色", "下划线", "表情图片", "Anko自定义")
private val text = "为人民服务"
private val key = "人民"
private var beginPos = text.indexOf(key)
private var endPos = beginPos + key.length

 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_spannable)

        tv_spannable.text = text
        tv_spinner.text = spannables[0]
        tv_spinner.setOnClickListener {
            selector("请选择可变字符串样式", spannables) { view,i ->
                tv_spinner.text = spannables[i]
                val spanText = SpannableString(text)
                //对这段文本运用指定的风格样式
                spanText.setSpan(when (i) {
                    0 -> RelativeSizeSpan(1.5f) //文字大小增大到1.5倍大
                    1 -> StyleSpan(Typeface.BOLD) //文字字体使用粗体
                    2 -> ForegroundColorSpan(Color.RED) //文字颜色使用红色
                    3 -> BackgroundColorSpan(Color.GREEN) //背景色使用绿色
                    4 -> UnderlineSpan() //文字下方增加下划线
                    else -> ImageSpan(this@SpannableActivity, R.drawable.people) //把文字替换为图片
                }, beginPos, endPos, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)

                tv_spannable.text = spanText
            }
        }
    }