Question

我想在TextView中显示一个有序列表，例如：
1）项目1 2）第2项

使用以下布局：

<TextView
    android:text="<ol><li>item 1\n</li><li>item 2\n</li></ol>
    />

我明白了：

第1项
第2项

如何将项目符号更改为数字？

感谢。

Answer 1

我认为你必须在代码中这样做。我不得不将LeadingMarginSpan子类化以使其工作。我就是这样做的。

private class NumberIndentSpan implements LeadingMarginSpan {

    private final int gapWidth;
    private final int leadWidth;
    private final int index;

    public NumberIndentSpan(int leadGap, int gapWidth, int index) {
        this.leadWidth = leadGap;
        this.gapWidth = gapWidth;
        this.index = index;
    }

    public int getLeadingMargin(boolean first) {
        return leadWidth + gapWidth;
    }

    public void drawLeadingMargin(Canvas c, Paint p, int x, int dir, int top, int baseline, int bottom, CharSequence text, int start, int end, boolean first, Layout l) {
        if (first) {
            Paint.Style orgStyle = p.getStyle();
            p.setStyle(Paint.Style.FILL);
            float width = p.measureText("4.");
            c.drawText(index + ".", (leadWidth + x - width / 2) * dir, bottom - p.descent(), p);
            p.setStyle(orgStyle);
        }
    }
}

抓住你的观点，并像这样使用它：

SpannableStringBuilder ssb = new SpannableStringBuilder();
for(String text : list) {
    int contentStart = content.length();
    content.append(text);
    content.setSpan(new NumberIndentSpan(15, 15, number), contentStart, content.length(), 0);
}

TextView view = findViewById(R.id.....);
view.setText(ssb);

希望这可以帮助其他人寻找： - ）

Answer 2

您可以改用这种方式：

&#8226; foo<br/>
&#8226; bar<br/>
&#8226; baz<br/>

Answer 3

这是我使用的解决方案。您可以将其复制并粘贴到活动中以查看其工作原理，但您应该使用变量生成所有属性。您可以使用填充参数来根据需要缩进。如果你想要子弹列表，你可以使用项目符号而不是数字。

<LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <TextView
                android:id="@+id/bullet1"
                android:textStyle="bold"
                android:layout_width="30dp"
                android:gravity="right"
                android:layout_height="wrap_content"
                android:paddingRight="5dp"
                android:text="1"
                android:textSize="20dp" />

            <TextView
                android:id="@+id/bullet1Text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingBottom="10dp"
                android:text="First bullet. First bullet. First bullet. First bullet. First bullet. First bullet. First bullet. First bullet. "
                android:textSize="15dp" />
        </LinearLayout>



        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal" >

            <TextView
                android:id="@+id/bullet2"
                android:textStyle="bold"
                android:layout_width="30dp"
                android:gravity="right"
                android:layout_height="wrap_content"
                android:paddingRight="5dp"
                android:text="2"
                android:textSize="20dp" />

            <TextView
                android:id="@+id/bullet2Text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:paddingBottom="10dp"
                android:text="Second bullet. Second bullet. Second bullet. Second bullet. Second bullet. Second bullet. Second bullet. "
                android:textSize="15dp" />
        </LinearLayout>

Answer 4

转到res / values / strings.xml然后粘贴到代码

下面

<string name="list">
  <li>1) Item 1</li>\n
  <li>2) Item 2</li>\n
  <li>3) Item 3</li>\n
<string>

然后转到包含TextView的布局文件，并替换为以下代码

<TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@string/list" />

Answer 5

此类处理TextView和EditText中的编号，并根据文本的大小缩放数字：

import android.graphics.Canvas
import android.graphics.Paint
import android.text.Layout
import android.text.Spanned
import android.text.style.AbsoluteSizeSpan
import android.text.style.LeadingMarginSpan

/**
 * Paragraph numbering.
 *
 *
 * Android seems to add the leading margin for an empty paragraph to the previous paragraph
 * (]0, 4][4, 4] --> the leading margin of the second span is added to the ]0, 4] paragraph
 * regardless of the Spanned.flags) --> therefore we ignore the leading margin for the last,
 * empty paragraph unless it's the only one
 */
class NumberSpan(nr: Int, gapWidth: Int, isEmpty: Boolean, isFirst: Boolean, isLast: Boolean)
    : LeadingMarginSpan {

    private val mNr: Int = nr
    private val mGapWidth: Int = gapWidth
    private val mIgnoreSpan: Boolean = isEmpty && isLast && !isFirst

    private var mWidth: Float = 0.toFloat()

    val value: Boolean?
        get() = java.lang.Boolean.TRUE

    override fun getLeadingMargin(first: Boolean): Int {
        return if (mIgnoreSpan) 0 else Math.max(Math.round(mWidth + 2), mGapWidth)
    }

    override fun drawLeadingMargin(c: Canvas, p: Paint, x: Int, dir: Int, top: Int, baseline: Int, bottom: Int,
                                   text: CharSequence, start: Int, end: Int, first: Boolean, l: Layout) {

        val spanned = text as Spanned
        if (!mIgnoreSpan && spanned.getSpanStart(this) == start) {
            // set paint
            val oldStyle = p.style
            val oldTextSize = p.textSize
            p.style = Paint.Style.FILL
            val textSize = determineTextSize(spanned, start, end, oldTextSize)
            p.textSize = textSize
            mWidth = p.measureText(mNr.toString() + ".")

            // draw the number
            c.drawText(mNr.toString() + ".", x.toFloat(), baseline.toFloat(), p)

            // restore paint
            p.style = oldStyle
            p.textSize = oldTextSize
        }
    }

    private fun determineTextSize(spanned: Spanned, start: Int, end: Int, defaultTextSize: Float): Float {
        // If the text size is different from default use that to determine the indicator size
        // That is determined by finding the first visible character within the list item span
        // and checking its size
        val position = firstVisibleCharIndex(spanned, start, end)
        if (position >= 0) {
            val absoluteSizeSpans = spanned.getSpans(position, position, AbsoluteSizeSpan::class.java)
            if (absoluteSizeSpans.isNotEmpty()) {
                val absoluteSizeSpan = absoluteSizeSpans[absoluteSizeSpans.size - 1]
                return absoluteSizeSpan.size.toFloat()
            }
        }

        // If there are no spans or no visible characters yet use the default calculation
        return defaultTextSize
    }

    private fun firstVisibleCharIndex(spanned: Spanned, start: Int, end: Int): Int {
        var newStart = start
        while (newStart < end) {
            if (isVisibleChar(spanned[newStart])) {
                return newStart
            }
            newStart++
        }

        return -1
    }

    private fun isVisibleChar(c: Char): Boolean {
        return when (c) {
            '\u200B', '\uFFEF' -> false
            else -> true
        }
    }

}

代码来自这个库https://github.com/1gravity/Android-RTEditor（从Java翻译成Kotlin）。我是那个图书馆的作者。

Answer 6

我在回答之后回答了answer by @jk2K 并修改了他的代码。因为我需要对每个要点都有缩进，

String[] textArray = {
    "dfsdljjlfsdsdfjsdjldssdfidfsjdljasdfjfds\n",
    "sdfjdfjlkfdjdfkfjiwejojodljfldsjodsjfsdjdlf\n",
    "djsdfjsdffjdflljfjsadfdjfldfjl"
};

SpannableStringBuilder content = new SpannableStringBuilder();
int number = 1;
for (String t1 : textArray) {
    int contentStart = content.length();

    content.append(t1);

    int contentEnd = content.length();
    content.setSpan(
            new BulletSpan(10),
            contentStart,
            contentEnd,
            Spannable.SPAN_INCLUSIVE_EXCLUSIVE
    );

    number++;
}

我使用了BulletSpan class from android library，并用new LeadingMarginSpan.Standard(0, 66)替换了new BulletSpan(10)，这创建了一个带有宽度的BulletSpan。如BulletSpan class documentation

中所述

BulletSpan(int gapWidth)

Creates a BulletSpan based on a gap width

因此您不再需要附加answer by @jk2K中提到的项目符号，

 String leadingString = number + ". ";
 content.append(leadingString);

Android TextView中的有序列表

6 个答案: