在Android中添加格式正确的项目符号 [英] Add Bullets with proper formatting in Android

问题描述

我想以Android文本显示项目符号.我已经成功添加了它们. 我通过互联网搜索，发现可以添加项目符号.但是，如果文本超过一行，则它不会像html list那样遵循适当的间距.

I wanted to show bullets in android text. I have added them successfully. I search over internet and found that you can add bullets. but if text goes more than one line it does not follow proper spacing like html list does.

请参见下面的屏幕截图.

See Screenshot below.

我已经使用以下代码添加了项目符号.

I have used following code to add bullets.

String longDescription = "Enhanced bass performance.\n" +
                "Lightweight headband enhances comfort and adds durability\n" +
                "Easy to adjust headband ensures optimum fit and comfort\n" +
                "2 metre-long cable";

        String arr[] = longDescription.split("\n");
        StringBuilder desc = new StringBuilder();
        for (String s : arr){
            desc.append("<li>"+s+"</li>");
        }
        String newDesc = "<ul>"+desc+"</ul>";

        tvProdDesc.setText(Html.fromHtml(newDesc, null, new UlTagHandler()));

这是我的

UlTagHandler.java

UlTagHandler.java

public class UlTagHandler implements Html.TagHandler {

    public void handleTag(boolean opening, String tag, Editable output,
                          XMLReader xmlReader) {
        if(tag.equals("ul") && !opening) output.append("\n");
        if(tag.equals("li") && opening) output.append("\n•\t");
    }
}

但是我希望文本应该像文字处理程序那样正确设置格式.

But I want text should be properly formatted like word processor does.

我想要这种类型的输出

我们可以做与上图类似的任何事情吗?

Can we do anything simillar to above image?

推荐答案

您对这个示例满意吗?

public class MainActivity extends AppCompatActivity {

    private TextView tvProdDesc;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvProdDesc = (TextView) findViewById(R.id.text1);

        String longDescription = "Enhanced bass performance.\n" +
                "Lightweight headband enhances comfort and adds durability\n" +
                "Easy to adjust headband ensures optimum fit and comfort\n" +
                "2 metre-long cable";

        String arr[] = longDescription.split("\n");

        int bulletGap = (int) dp(10);

        SpannableStringBuilder ssb = new SpannableStringBuilder();
        for (int i = 0; i < arr.length; i++) {
            String line = arr[i];
            SpannableString ss = new SpannableString(line);
            ss.setSpan(new BulletSpan(bulletGap), 0, line.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
            ssb.append(ss);

            //avoid last "\n"
            if(i+1<arr.length)
                ssb.append("\n");

        }

        tvProdDesc.setText(ssb);
    }

    private float dp(int dp) {
        return getResources().getDisplayMetrics().density * dp;
    }
}

结果:

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