我是Android新手，我看过其他人提出的类似问题，但没有明确的答案，因为我认为我的问题有点不同。
我在程序中使用 TextView，其中可以有链接、文本、数字等。以下是我正在使用的 TextView。
<TextView
android:id="@+id/viewText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="5dp"
android:autoLink="web"
android:linksClickable="false"
android:ellipsize="end"
android:maxLines="7" />
虽然这适用于普通文本，但只要 TextView 中存在链接，椭圆形就不起作用。我使用“autoLink”是为了向用户显示它是链接，但已将
android:linksClickablefalse谢谢你。
我也面临着类似的问题。尝试过使用
android:autoLink="web"
android:ellipsize="end"
android:linksClickable="true"
android:maxLines="6"
对于我的 TextView，一旦将某些链接粘贴到其中，它就无法省略。 对我有用的完美解决方案是这里的解决方案：https://gist.github.com/shayusefi/5b4709f8b2024dea735f
粘贴在这里，以防将来发生任何事情
/*
* Copyright (C) 2011 Micah Hainline
* Copyright (C) 2012 Triposo
* Copyright (C) 2013 Paul Imhoff
* Copyright (C) 2014 Shahin Yousefi
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.support.annotation.NonNull;
import android.text.Layout;
import android.text.Layout.Alignment;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.StaticLayout;
import android.text.TextUtils;
import android.text.TextUtils.TruncateAt;
import android.util.AttributeSet;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
/**
* A {@link android.widget.TextView} that ellipsizes more intelligently.
* This class supports ellipsizing multiline text through setting {@code android:ellipsize}
* and {@code android:maxLines}.
*/
public class EllipsizingTextView extends TextView {
private static final CharSequence ELLIPSIS = "\u2026";
private static final Pattern DEFAULT_END_PUNCTUATION
= Pattern.compile("[\\.!?,;:\u2026]*$", Pattern.DOTALL);
private final List<EllipsizeListener> mEllipsizeListeners = new ArrayList<>();
private EllipsizeStrategy mEllipsizeStrategy;
private boolean isEllipsized;
private boolean isStale;
private boolean programmaticChange;
private CharSequence mFullText;
private int mMaxLines;
private float mLineSpacingMult = 1.0f;
private float mLineAddVertPad = 0.0f;
/**
* The end punctuation which will be removed when appending {@link #ELLIPSIS}.
*/
private Pattern mEndPunctPattern;
public EllipsizingTextView(Context context) {
this(context, null);
}
public EllipsizingTextView(Context context, AttributeSet attrs) {
this(context, attrs, android.R.attr.textViewStyle);
}
public EllipsizingTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
final TypedArray a = context.obtainStyledAttributes(attrs,
new int[]{ android.R.attr.maxLines }, defStyle, 0);
setMaxLines(a.getInt(0, Integer.MAX_VALUE));
a.recycle();
setEndPunctuationPattern(DEFAULT_END_PUNCTUATION);
}
public void setEndPunctuationPattern(Pattern pattern) {
mEndPunctPattern = pattern;
}
public void addEllipsizeListener(@NonNull EllipsizeListener listener) {
mEllipsizeListeners.add(listener);
}
public void removeEllipsizeListener(EllipsizeListener listener) {
mEllipsizeListeners.remove(listener);
}
public boolean isEllipsized() {
return isEllipsized;
}
/**
* @return The maximum number of lines displayed in this {@link android.widget.TextView}.
*/
@SuppressLint("Override")
public int getMaxLines() {
return mMaxLines;
}
@Override
public void setMaxLines(int maxLines) {
super.setMaxLines(maxLines);
mMaxLines = maxLines;
isStale = true;
}
/**
* Determines if the last fully visible line is being ellipsized.
*
* @return {@code true} if the last fully visible line is being ellipsized;
* otherwise, returns {@code false}.
*/
public boolean ellipsizingLastFullyVisibleLine() {
return mMaxLines == Integer.MAX_VALUE;
}
@Override
public void setLineSpacing(float add, float mult) {
mLineAddVertPad = add;
mLineSpacingMult = mult;
super.setLineSpacing(add, mult);
}
@Override
public void setText(CharSequence text, BufferType type) {
if (!programmaticChange) {
mFullText = text;
isStale = true;
}
super.setText(text, type);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (ellipsizingLastFullyVisibleLine()) isStale = true;
}
@Override
public void setPadding(int left, int top, int right, int bottom) {
super.setPadding(left, top, right, bottom);
if (ellipsizingLastFullyVisibleLine()) isStale = true;
}
@Override
protected void onDraw(@NonNull Canvas canvas) {
if (isStale) resetText();
super.onDraw(canvas);
}
/**
* Sets the ellipsized text if appropriate.
*/
private void resetText() {
int maxLines = getMaxLines();
CharSequence workingText = mFullText;
boolean ellipsized = false;
if (maxLines != -1) {
if (mEllipsizeStrategy == null) setEllipsize(null);
workingText = mEllipsizeStrategy.processText(mFullText);
ellipsized = !mEllipsizeStrategy.isInLayout(mFullText);
}
if (!workingText.equals(getText())) {
programmaticChange = true;
try {
setText(workingText);
} finally {
programmaticChange = false;
}
}
isStale = false;
if (ellipsized != isEllipsized) {
isEllipsized = ellipsized;
for (EllipsizeListener listener : mEllipsizeListeners) {
listener.ellipsizeStateChanged(ellipsized);
}
}
}
/**
* Causes words in the text that are longer than the view is wide to be ellipsized
* instead of broken in the middle. Use {@code null} to turn off ellipsizing.
*
* @param where part of text to ellipsize
*/
@Override
public void setEllipsize(TruncateAt where) {
if (where == null) {
mEllipsizeStrategy = new EllipsizeNoneStrategy();
return;
}
switch (where) {
case END:
mEllipsizeStrategy = new EllipsizeEndStrategy();
break;
case START:
mEllipsizeStrategy = new EllipsizeStartStrategy();
break;
case MIDDLE:
mEllipsizeStrategy = new EllipsizeMiddleStrategy();
break;
case MARQUEE:
super.setEllipsize(where);
isStale = false;
default:
mEllipsizeStrategy = new EllipsizeNoneStrategy();
break;
}
}
/**
* A listener that notifies when the ellipsize state has changed.
*/
public interface EllipsizeListener {
void ellipsizeStateChanged(boolean ellipsized);
}
/**
* A base class for an ellipsize strategy.
*/
private abstract class EllipsizeStrategy {
/**
* Returns ellipsized text if the text does not fit inside of the layout;
* otherwise, returns the full text.
*
* @param text text to process
* @return Ellipsized text if the text does not fit inside of the layout;
* otherwise, returns the full text.
*/
public CharSequence processText(CharSequence text) {
return !isInLayout(text) ? createEllipsizedText(text) : text;
}
/**
* Determines if the text fits inside of the layout.
*
* @param text text to fit
* @return {@code true} if the text fits inside of the layout;
* otherwise, returns {@code false}.
*/
public boolean isInLayout(CharSequence text) {
Layout layout = createWorkingLayout(text);
return layout.getLineCount() <= getLinesCount();
}
/**
* Creates a working layout with the given text.
*
* @param workingText text to create layout with
* @return {@link android.text.Layout} with the given text.
*/
protected Layout createWorkingLayout(CharSequence workingText) {
return new StaticLayout(workingText, getPaint(),
getMeasuredWidth() - getPaddingLeft() - getPaddingRight(),
Alignment.ALIGN_NORMAL, mLineSpacingMult,
mLineAddVertPad, false /* includepad */);
}
/**
* Get how many lines of text we are allowed to display.
*/
protected int getLinesCount() {
if (ellipsizingLastFullyVisibleLine()) {
int fullyVisibleLinesCount = getFullyVisibleLinesCount();
return fullyVisibleLinesCount == -1 ? 1 : fullyVisibleLinesCount;
} else {
return mMaxLines;
}
}
/**
* Get how many lines of text we can display so their full height is visible.
*/
protected int getFullyVisibleLinesCount() {
Layout layout = createWorkingLayout("");
int height = getHeight() - getCompoundPaddingTop() - getCompoundPaddingBottom();
int lineHeight = layout.getLineBottom(0);
return height / lineHeight;
}
/**
* Creates ellipsized text from the given text.
*
* @param fullText text to ellipsize
* @return Ellipsized text
*/
protected abstract CharSequence createEllipsizedText(CharSequence fullText);
}
/**
* An {@link EllipsizingTextView.EllipsizeStrategy} that
* does not ellipsize text.
*/
private class EllipsizeNoneStrategy extends EllipsizeStrategy {
@Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
return fullText;
}
}
/**
* An {@link EllipsizingTextView.EllipsizeStrategy} that
* ellipsizes text at the end.
*/
private class EllipsizeEndStrategy extends EllipsizeStrategy {
@Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
Layout layout = createWorkingLayout(fullText);
int cutOffIndex = layout.getLineEnd(mMaxLines - 1);
int textLength = fullText.length();
int cutOffLength = textLength - cutOffIndex;
if (cutOffLength < ELLIPSIS.length()) cutOffLength = ELLIPSIS.length();
String workingText = TextUtils.substring(fullText, 0, textLength - cutOffLength).trim();
String strippedText = stripEndPunctuation(workingText);
while (!isInLayout(strippedText + ELLIPSIS)) {
int lastSpace = workingText.lastIndexOf(' ');
if (lastSpace == -1) break;
workingText = workingText.substring(0, lastSpace).trim();
strippedText = stripEndPunctuation(workingText);
}
workingText = strippedText + ELLIPSIS;
SpannableStringBuilder dest = new SpannableStringBuilder(workingText);
if (fullText instanceof Spanned) {
TextUtils.copySpansFrom((Spanned) fullText, 0, workingText.length(), null, dest, 0);
}
return dest;
}
/**
* Strips the end punctuation from a given text according to {@link #mEndPunctPattern}.
*
* @param workingText text to strip end punctuation from
* @return Text without end punctuation.
*/
public String stripEndPunctuation(CharSequence workingText) {
return mEndPunctPattern.matcher(workingText).replaceFirst("");
}
}
/**
* An {@link EllipsizingTextView.EllipsizeStrategy} that
* ellipsizes text at the start.
*/
private class EllipsizeStartStrategy extends EllipsizeStrategy {
@Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
Layout layout = createWorkingLayout(fullText);
int cutOffIndex = layout.getLineEnd(mMaxLines - 1);
int textLength = fullText.length();
int cutOffLength = textLength - cutOffIndex;
if (cutOffLength < ELLIPSIS.length()) cutOffLength = ELLIPSIS.length();
String workingText = TextUtils.substring(fullText, cutOffLength, textLength).trim();
while (!isInLayout(ELLIPSIS + workingText)) {
int firstSpace = workingText.indexOf(' ');
if (firstSpace == -1) break;
workingText = workingText.substring(firstSpace, workingText.length()).trim();
}
workingText = ELLIPSIS + workingText;
SpannableStringBuilder dest = new SpannableStringBuilder(workingText);
if (fullText instanceof Spanned) {
TextUtils.copySpansFrom((Spanned) fullText, textLength - workingText.length(),
textLength, null, dest, 0);
}
return dest;
}
}
/**
* An {@link EllipsizingTextView.EllipsizeStrategy} that
* ellipsizes text in the middle.
*/
private class EllipsizeMiddleStrategy extends EllipsizeStrategy {
@Override
protected CharSequence createEllipsizedText(CharSequence fullText) {
Layout layout = createWorkingLayout(fullText);
int cutOffIndex = layout.getLineEnd(mMaxLines - 1);
int textLength = fullText.length();
int cutOffLength = textLength - cutOffIndex;
if (cutOffLength < ELLIPSIS.length()) cutOffLength = ELLIPSIS.length();
cutOffLength += cutOffIndex % 2; // Make it even.
String firstPart = TextUtils.substring(
fullText, 0, textLength / 2 - cutOffLength / 2).trim();
String secondPart = TextUtils.substring(
fullText, textLength / 2 + cutOffLength / 2, textLength).trim();
while (!isInLayout(firstPart + ELLIPSIS + secondPart)) {
int lastSpaceFirstPart = firstPart.lastIndexOf(' ');
int firstSpaceSecondPart = secondPart.indexOf(' ');
if (lastSpaceFirstPart == -1 || firstSpaceSecondPart == -1) break;
firstPart = firstPart.substring(0, lastSpaceFirstPart).trim();
secondPart = secondPart.substring(firstSpaceSecondPart, secondPart.length()).trim();
}
SpannableStringBuilder firstDest = new SpannableStringBuilder(firstPart);
SpannableStringBuilder secondDest = new SpannableStringBuilder(secondPart);
if (fullText instanceof Spanned) {
TextUtils.copySpansFrom((Spanned) fullText, 0, firstPart.length(),
null, firstDest, 0);
TextUtils.copySpansFrom((Spanned) fullText, textLength - secondPart.length(),
textLength, null, secondDest, 0);
}
return TextUtils.concat(firstDest, ELLIPSIS, secondDest);
}
}
}
可选的事情（可能会防止生产中出现某些 ArrayIndexOutOfBoundsException）是将 isInLayout 方法替换为
public boolean isInLayout(CharSequence text) {
return mMaxLines == Integer.MAX_VALUE || createWorkingLayout(text).getLineCount() <= getLinesCount();
}
还值得一提的是，你不能一直依赖
tv.isEllipsizedtv.layoutisEllipsized //reason for if = we will enter infinite loop when inactive content is not visible
if (description.isEmpty()) {
resolveEllipsized()
} else {
//reason for runnable = there is no show more button, because tv.layout might be null
inactiveContentTV.post(showMoreBehaviorResolver)
}
你
showMoreBehaviorResolver showMoreBehaviorResolver = Runnable {
if (tv.layout == null) { // wait while layout become available
Log.d(TAG, "post to runnable for show more/less button based on layout nullability")
tv.post(showMoreBehaviorResolver)
return@Runnable
}
//decide what to do with show more/show less/ and ... at the end
resolveEllipsized()
}
和
resolveEllipsized() private fun resolveEllipsized() {
with(contentSizeToggleTV) {
if (tv.isEllipsized) {
this.isVisible = true
this.setSingleOnClickListener {
onDescriptionExpandToggled?.invoke(true)
}
tv.setSingleOnClickListener {
onDescriptionExpandToggled?.invoke(true)
}
} else {
this.isVisible = false
this.setOnClickListener(null)
tv.setOnClickListener(null)
}
}
}