HtmlSpanner 使用小結 — 安卓解析html

如何利用 HtmlSpanner解析 HTML格式 的字符串：

1. GitHub 下載HtmlSpanner項目 https://github.com/NightWhistler/HtmlSpanner

2. 最好是直接放在java目錄下在，這樣不需要改引用的包路徑

3.  引入需要的依賴包

    implementation 'net.sourceforge.htmlcleaner:htmlcleaner:2.21'
    implementation 'com.osbcp:cssparser:1.7'

  4. 使用方法：

 // 頁面上用於展示 html格式的文本布局
 TextView textView = findViewById(R.id.htmlSpanner);
 // 直接 new一個 HtmlSpanner對象
 HtmlSpanner htmlSpanner = new HtmlSpanner(); // 格式化
 // 解析 html得到 spannable對象
 Spannable spannable1 = htmlSpanner.fromHtml("<span style='color:red'>html格式的文字1</span>");
 // 显示到 TextView上
 textView.setText(spannable1);

 5. 在使用中遇到的問題——當富文本中顏色格式是rgb格式，解析失敗

 解決思路：

　　1. 首先我們解析的是style=’color:rgb(0，255，255)’ 這種格式，於是看源碼覺得 CSSCompiler 這個類很有問題

　　2. 找與顏色相關的於是就找到了 parseCSSColor( String colorString ) 這個方法，看起來就是轉換顏色用的

　　3. 源碼的寫法如下：(是沒有對於rgb格式的算法，所以不能解析就很合理啦)

 　　4. 想法修改：( 遇到 0rgb格式就先處理成我們的 hex格式，這樣不就完美了嘛 )

　　5. 工具類代碼如下：

package com.xxx.xxx.xxx;

public class ColorUtil {

     /**
     * rgb 格式的顏色轉 hex格式顏色
     * @param rgb
     * @return
     */
    public static String rgb2hex(String rgb) {
        int r = 0;
        int g = 0;
        int b = 0;
        int left = rgb.indexOf("(");
        int right = rgb.indexOf(")");
        if (left > -1 && right > -1 && right > left) {
            String substring = rgb.substring(left + 1, right);
            String[] split = substring.split(",");
            if (split.length == 3){
                r = Integer.valueOf(split[0].trim());
                g = Integer.valueOf(split[1].trim());
                b = Integer.valueOf(split[2].trim());
            }
        }
        String rFString, rSString, gFString, gSString,
                bFString, bSString, result;
        int red, green, blue;
        int rred, rgreen, rblue;
        red = r / 16;
        rred = r % 16;
        if (red == 10) rFString = "A";
        else if (red == 11) rFString = "B";
        else if (red == 12) rFString = "C";
        else if (red == 13) rFString = "D";
        else if (red == 14) rFString = "E";
        else if (red == 15) rFString = "F";
        else rFString = String.valueOf(red);

        if (rred == 10) rSString = "A";
        else if (rred == 11) rSString = "B";
        else if (rred == 12) rSString = "C";
        else if (rred == 13) rSString = "D";
        else if (rred == 14) rSString = "E";
        else if (rred == 15) rSString = "F";
        else rSString = String.valueOf(rred);

        rFString = rFString + rSString;

        green = g / 16;
        rgreen = g % 16;

        if (green == 10) gFString = "A";
        else if (green == 11) gFString = "B";
        else if (green == 12) gFString = "C";
        else if (green == 13) gFString = "D";
        else if (green == 14) gFString = "E";
        else if (green == 15) gFString = "F";
        else gFString = String.valueOf(green);

        if (rgreen == 10) gSString = "A";
        else if (rgreen == 11) gSString = "B";
        else if (rgreen == 12) gSString = "C";
        else if (rgreen == 13) gSString = "D";
        else if (rgreen == 14) gSString = "E";
        else if (rgreen == 15) gSString = "F";
        else gSString = String.valueOf(rgreen);

        gFString = gFString + gSString;

        blue = b / 16;
        rblue = b % 16;

        if (blue == 10) bFString = "A";
        else if (blue == 11) bFString = "B";
        else if (blue == 12) bFString = "C";
        else if (blue == 13) bFString = "D";
        else if (blue == 14) bFString = "E";
        else if (blue == 15) bFString = "F";
        else bFString = String.valueOf(blue);

        if (rblue == 10) bSString = "A";
        else if (rblue == 11) bSString = "B";
        else if (rblue == 12) bSString = "C";
        else if (rblue == 13) bSString = "D";
        else if (rblue == 14) bSString = "E";
        else if (rblue == 15) bSString = "F";
        else bSString = String.valueOf(rblue);
        bFString = bFString + bSString;
        result = "#" + rFString + gFString + bFString;
        return result;
    }
}

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