解決問題

使用鏈式結(jié)構(gòu)組成SpannableStringBuilder。使得結(jié)構(gòu)上更加清晰，使用時更加方便。

使用對比

效果圖：

Screenshot_20180711-105250.jpg

代碼對比：

//鏈式結(jié)構(gòu)
    private fun initContentTop() {
        RichText.Builder(this)
                        .backColor(1, 4, Color.RED)
                        .foreColor(5, 9, Color.BLUE)
                        .fontSize(10, 15, 20)
                        .image(2, 3, resources.getDrawable(R.mipmap.ic_launcher))
                        .addTextSpanOperation(TextSpanOperation(3, 4, AbsoluteSizeSpan(20)))
                        .click(6, 16, View.OnClickListener {
                            Toast.makeText(this@TextViewActivity, TEXT, Toast.LENGTH_LONG).show()
                        })
                        .underline(15, 20)
                        .strikethrough(21, 23)
                        .text(TEXT)
                        .build(tvContentTop)
    }

    //常規(guī)寫法
    private fun initContentBottom() {
        var backColor = BackgroundColorSpan(Color.RED)
        var foreColor = ForegroundColorSpan(Color.BLUE)
        var fontSize = AbsoluteSizeSpan(20)
        var d = resources.getDrawable(R.mipmap.ic_launcher)
        d.setBounds(0, 0, d.intrinsicWidth, d.intrinsicHeight)
        var image = ImageSpan(d)
        var fontSize2 = AbsoluteSizeSpan(20)
        var spanBuilder = SpannableStringBuilder(TEXT)
        var clickSpan = object : ClickableSpan() {
            override fun onClick(widget: View?) {
                Toast.makeText(this@TextViewActivity, TEXT, Toast.LENGTH_LONG).show()
            }

            override fun updateDrawState(ds: TextPaint?) {
                //去掉一些樣式，都由自己來定義
            }
        }
        var underlineSpan = UnderlineSpan()
        var strikethroughSpan = StrikethroughSpan()
        spanBuilder.setSpan(backColor, 1, 4, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        spanBuilder.setSpan(foreColor, 5, 9, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        spanBuilder.setSpan(fontSize, 10, 15, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        spanBuilder.setSpan(image, 2, 3, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        spanBuilder.setSpan(fontSize2, 3, 4, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        spanBuilder.setSpan(clickSpan, 6, 16, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        spanBuilder.setSpan(underlineSpan, 15, 20, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        spanBuilder.setSpan(strikethroughSpan, 21, 23, SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
        tvContentBottom.movementMethod = MyLinkMovementMethod.getInstance()
        tvContentBottom.text = spanBuilder
    }

相對來說還是上面的鏈式結(jié)構(gòu)的代碼會比較明了。

如何使用

Add it in your root build.gradle at the end of repositories:

allprojects {
        repositories {
            ...
            maven { url 'https://jitpack.io' }
        }
    }

Step 2. Add the dependency

    dependencies {
            implementation 'com.github.javalong:RichText:1.1.0'
    }

Step 3. Multiple text span operation

      //設置文本
      fun text(text: String): Builder {
            this.text = text
            return this
        }

        //設置圖片icon
        fun image(startIndex: Int, endIndex: Int, d: Drawable): Builder {
            d.setBounds(0, 0, d.intrinsicWidth, d.intrinsicHeight)
            var span = ImageSpan(d)
            operationList.add(TextSpanOperation(startIndex, endIndex, span))
            return this
        }
     //設置字體大小
        fun fontSize(startIndex: Int, endIndex: Int, size: Int): Builder {
            var span = AbsoluteSizeSpan(size)
            operationList.add(TextSpanOperation(startIndex, endIndex, span))
            return this
        }

        //設置字體顏色
        fun foreColor(startIndex: Int, endIndex: Int, color: Int): Builder {
            var span = ForegroundColorSpan(color)
            operationList.add(TextSpanOperation(startIndex, endIndex, span))
            return this
        }

        //設置背景顏色
        fun backColor(startIndex: Int, endIndex: Int, color: Int): Builder {
            var span = BackgroundColorSpan(color)
            operationList.add(TextSpanOperation(startIndex, endIndex, span))
            return this
        }
        
        //設置點擊事件
        fun click(startIndex: Int, endIndex: Int, listener: View.OnClickListener): Builder {
            var span = object : ClickableSpan() {
                override fun onClick(widget: View?) {
                    listener.onClick(widget)
                }

                override fun updateDrawState(ds: TextPaint?) {
                    //去掉一些樣式，都由自己來定義

                }
            }
            operationList.add(TextSpanOperation(startIndex, endIndex, span))
            return this
        }
        
        //添加下劃線
        fun underline(startIndex: Int, endIndex: Int): Builder {
            var span = UnderlineSpan()
            operationList.add(TextSpanOperation(startIndex, endIndex, span))
            return this
        }
        
        //添加中劃線
        fun strikethrough(startIndex: Int, endIndex: Int): Builder {
            var span = StrikethroughSpan()
            operationList.add(TextSpanOperation(startIndex, endIndex, span))
            return this
        }

Step 4. Use in code

 RichText.Builder(this)
                 .backColor(1, 4, Color.RED)
                 .foreColor(5, 9, Color.BLUE)
                 .fontSize(10, 15, 20)
                 .image(2, 3, resources.getDrawable(R.mipmap.ic_launcher))
                 .addTextSpanOperation(TextSpanOperation(3, 4, AbsoluteSizeSpan(20)))
                 .click(6, 16, View.OnClickListener {
                     Toast.makeText(this@TextViewActivity, TEXT, Toast.LENGTH_LONG).show()
                 })
                 .underline(15, 20)
                 .strikethrough(21, 23)
                 .text(TEXT)
                 .build(tvContentTop)

重點可以關注下addTextSpanOperation方法，因為TextSpan有很多，這里就把常見的幾個抽取出來。

Step 5. Adapt EditText
EditText也是TextView，所以這里也適用。

RichText.Builder(this)
                .backColor(1, 4, Color.RED,SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
                .foreColor(5, 9, Color.BLUE,SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
                .fontSize(10, 15, 20,SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE)
                .image(2, 3, resources.getDrawable(R.mipmap.ic_launcher))
                .addTextSpanOperation(TextSpanOperation(3, 4, AbsoluteSizeSpan(20)))
                .text(TEXT)
                .build(etContentTop)

操作符方法中最后一個參數(shù)是SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE。在EditText會用的比較多。可參考鏈接。
https://blog.csdn.net/lanxingfeifei/article/details/50523555