android ellipsize多行textview
我需要省略一个多行文本视图。 我的组件足够大，可以显示至less4行的椭圆，但只显示2行。 我试图改变组件的最小和最大行数，但它什么也不改变。
这是解决问题的办法。 它是TextView的一个子类，实际上适用于椭圆化。 在早先的答案中列出的android-textview-multiline-ellipse代码在某些情况下被发现是bug，而且在GPL下，这对于我们大多数人来说并不真实。 如果您愿意，可以自由地使用此代码，而不需要署名，也可以使用Apache许可证。 请注意，有一个监听器在文本变成椭圆化时通知您，我发现自己非常有用。
import java.util.ArrayList; import java.util.List; import android.content.Context; import android.graphics.Canvas; import android.text.Layout; import android.text.Layout.Alignment; import android.text.StaticLayout; import android.text.TextUtils.TruncateAt; import android.util.AttributeSet; import android.widget.TextView; public class EllipsizingTextView extends TextView { private static final String ELLIPSIS = "..."; public interface EllipsizeListener { void ellipsizeStateChanged(boolean ellipsized); } private final List<EllipsizeListener> ellipsizeListeners = new ArrayList<EllipsizeListener>(); private boolean isEllipsized; private boolean isStale; private boolean programmaticChange; private String fullText; private int maxLines = -1; private float lineSpacingMultiplier = 1.0f; private float lineAdditionalVerticalPadding = 0.0f; public EllipsizingTextView(Context context) { super(context); } public EllipsizingTextView(Context context, AttributeSet attrs) { super(context, attrs); } public EllipsizingTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } public void addEllipsizeListener(EllipsizeListener listener) { if (listener == null) { throw new NullPointerException(); } ellipsizeListeners.add(listener); } public void removeEllipsizeListener(EllipsizeListener listener) { ellipsizeListeners.remove(listener); } public boolean isEllipsized() { return isEllipsized; } @Override public void setMaxLines(int maxLines) { super.setMaxLines(maxLines); this.maxLines = maxLines; isStale = true; } public int getMaxLines() { return maxLines; } @Override public void setLineSpacing(float add, float mult) { this.lineAdditionalVerticalPadding = add; this.lineSpacingMultiplier = mult; super.setLineSpacing(add, mult); } @Override protected void onTextChanged(CharSequence text, int start, int before, int after) { super.onTextChanged(text, start, before, after); if (!programmaticChange) { fullText = text.toString(); isStale = true; } } @Override protected void onDraw(Canvas canvas) { if (isStale) { super.setEllipsize(null); resetText(); } super.onDraw(canvas); } private void resetText() { int maxLines = getMaxLines(); String workingText = fullText; boolean ellipsized = false; if (maxLines != -1) { Layout layout = createWorkingLayout(workingText); if (layout.getLineCount() > maxLines) { workingText = fullText.substring(0, layout.getLineEnd(maxLines - 1)).trim(); while (createWorkingLayout(workingText + ELLIPSIS).getLineCount() > maxLines) { int lastSpace = workingText.lastIndexOf(' '); if (lastSpace == -1) { break; } workingText = workingText.substring(0, lastSpace); } workingText = workingText + ELLIPSIS; ellipsized = true; } } if (!workingText.equals(getText())) { programmaticChange = true; try { setText(workingText); } finally { programmaticChange = false; } } isStale = false; if (ellipsized != isEllipsized) { isEllipsized = ellipsized; for (EllipsizeListener listener : ellipsizeListeners) { listener.ellipsizeStateChanged(ellipsized); } } } private Layout createWorkingLayout(String workingText) { return new StaticLayout(workingText, getPaint(), getWidth() - getPaddingLeft() - getPaddingRight(), Alignment.ALIGN_NORMAL, lineSpacingMultiplier, lineAdditionalVerticalPadding, false); } @Override public void setEllipsize(TruncateAt where) { // Ellipsize settings are not respected } } 在我的应用程序中，我有类似的问题：2行string，最后，如果string太长，最后添加“…”。 我用这个代码在XML文件中的文本视图标记：
android:maxLines="2" android:ellipsize="end" android:singleLine="false"
我也遇到了这个问题。 还有一个相当老的问题还没有答案： Bug 2254
试试这个，它适用于我，我有4条线，它将“…”添加到最后/第四行的末尾。 它与士气的答案相同，但我有singeLine =“假”在那里。
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:maxLines="4" android:ellipsize="marquee" android:singleLine="false" android:text="Hi make this a very long string that wraps at least 4 lines, seriously make it really really long so it gets cut off at the fourth line not joke. Just do it!" />
得到这个问题，最后，我build立了一个简短的解决scheme。 你只需要手工省略你想要的行，你的maxLine属性将会削减你的文本。
这个例子最多可以剪切你的文本3行
final TextView title = (TextView)findViewById(R.id.text); title.setText("A really long text"); ViewTreeObserver vto = title.getViewTreeObserver(); vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { ViewTreeObserver obs = title.getViewTreeObserver(); obs.removeGlobalOnLayoutListener(this); if(title.getLineCount() > 3){ Log.d("","Line["+title.getLineCount()+"]"+title.getText()); int lineEndIndex = title.getLayout().getLineEnd(2); String text = title.getText().subSequence(0, lineEndIndex-3)+"..."; title.setText(text); Log.d("","NewText:"+text); } } });
我将Micah Hainline，AlexBăluţ和Paul Imhoff的解决scheme结合在一起，创build了一个椭圆化多行TextView ，它也支持Spanned文本。
你只需要设置android:ellipsize和android:maxLines 。
/* * 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; 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; 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); 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; } @SuppressLint("Override") public int getMaxLines() { return mMaxLines; } @Override public void setMaxLines(int maxLines) { super.setMaxLines(maxLines); mMaxLines = maxLines; isStale = true; } 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); } 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); } } } @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; } } public interface EllipsizeListener { void ellipsizeStateChanged(boolean ellipsized); } private abstract class EllipsizeStrategy { public CharSequence processText(CharSequence text) { return !isInLayout(text) ? createEllipsizedText(text) : text; } public boolean isInLayout(CharSequence text) { Layout layout = createWorkingLayout(text); return layout.getLineCount() <= getLinesCount(); } protected Layout createWorkingLayout(CharSequence workingText) { return new StaticLayout(workingText, getPaint(), getMeasuredWidth() - getPaddingLeft() - getPaddingRight(), Alignment.ALIGN_NORMAL, mLineSpacingMult, mLineAddVertPad, false /* includepad */); } protected int getLinesCount() { if (ellipsizingLastFullyVisibleLine()) { int fullyVisibleLinesCount = getFullyVisibleLinesCount(); return fullyVisibleLinesCount == -1 ? 1 : fullyVisibleLinesCount; } else { return mMaxLines; } } protected int getFullyVisibleLinesCount() { Layout layout = createWorkingLayout(""); int height = getHeight() - getCompoundPaddingTop() - getCompoundPaddingBottom(); int lineHeight = layout.getLineBottom(0); return height / lineHeight; } protected abstract CharSequence createEllipsizedText(CharSequence fullText); } private class EllipsizeNoneStrategy extends EllipsizeStrategy { @Override protected CharSequence createEllipsizedText(CharSequence fullText) { return fullText; } } 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; } public String stripEndPunctuation(CharSequence workingText) { return mEndPunctPattern.matcher(workingText).replaceFirst(""); } } 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; } } 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); } } }
完整的源代码： EllipsizingTextView.java
基于Micah Hainline和alebs评论的解决scheme，我使用了以下方法来处理myTextView.setText(Html.fromHtml("<b>Testheader</b> - Testcontent"));文本，以便例如myTextView.setText(Html.fromHtml("<b>Testheader</b> - Testcontent")); 作品！ 请注意，这只适用于现在的Spanned 。 它也许可以被修改来处理String和Spanned任何一种方式。
public class EllipsizingTextView extends TextView { private static final Spanned ELLIPSIS = new SpannedString("…"); public interface EllipsizeListener { void ellipsizeStateChanged(boolean ellipsized); } private final List<EllipsizeListener> ellipsizeListeners = new ArrayList<EllipsizeListener>(); private boolean isEllipsized; private boolean isStale; private boolean programmaticChange; private Spanned fullText; private int maxLines; private float lineSpacingMultiplier = 1.0f; private float lineAdditionalVerticalPadding = 0.0f; public EllipsizingTextView(Context context) { this(context, null); } public EllipsizingTextView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public EllipsizingTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); super.setEllipsize(null); TypedArray a = context.obtainStyledAttributes(attrs, new int[] { android.R.attr.maxLines }); setMaxLines(a.getInt(0, Integer.MAX_VALUE)); } public void addEllipsizeListener(EllipsizeListener listener) { if (listener == null) { throw new NullPointerException(); } ellipsizeListeners.add(listener); } public void removeEllipsizeListener(EllipsizeListener listener) { ellipsizeListeners.remove(listener); } public boolean isEllipsized() { return isEllipsized; } @Override public void setMaxLines(int maxLines) { super.setMaxLines(maxLines); this.maxLines = maxLines; isStale = true; } public int getMaxLines() { return maxLines; } public boolean ellipsizingLastFullyVisibleLine() { return maxLines == Integer.MAX_VALUE; } @Override public void setLineSpacing(float add, float mult) { this.lineAdditionalVerticalPadding = add; this.lineSpacingMultiplier = mult; super.setLineSpacing(add, mult); } @Override public void setText(CharSequence text, BufferType type) { if (!programmaticChange && text instanceof Spanned) { fullText = (Spanned) 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; } } 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(Canvas canvas) { if (isStale) { resetText(); } super.onDraw(canvas); } private void resetText() { Spanned workingText = fullText; boolean ellipsized = false; Layout layout = createWorkingLayout(workingText); int linesCount = getLinesCount(); if (layout.getLineCount() > linesCount) { // We have more lines of text than we are allowed to display. workingText = (Spanned) fullText.subSequence(0, layout.getLineEnd(linesCount - 1)); while (createWorkingLayout((Spanned) TextUtils.concat(workingText, ELLIPSIS)).getLineCount() > linesCount) { int lastSpace = workingText.toString().lastIndexOf(' '); if (lastSpace == -1) { break; } workingText = (Spanned) workingText.subSequence(0, lastSpace); } workingText = (Spanned) TextUtils.concat(workingText, ELLIPSIS); ellipsized = true; } if (!workingText.equals(getText())) { programmaticChange = true; try { setText(workingText); } finally { programmaticChange = false; } } isStale = false; if (ellipsized != isEllipsized) { isEllipsized = ellipsized; for (EllipsizeListener listener : ellipsizeListeners) { listener.ellipsizeStateChanged(ellipsized); } } } /** * Get how many lines of text we are allowed to display. */ private int getLinesCount() { if (ellipsizingLastFullyVisibleLine()) { int fullyVisibleLinesCount = getFullyVisibleLinesCount(); if (fullyVisibleLinesCount == -1) { return 1; } else { return fullyVisibleLinesCount; } } else { return maxLines; } } /** * Get how many lines of text we can display so their full height is visible. */ private int getFullyVisibleLinesCount() { Layout layout = createWorkingLayout(new SpannedString("")); int height = getHeight() - getPaddingTop() - getPaddingBottom(); int lineHeight = layout.getLineBottom(0); return height / lineHeight; } private Layout createWorkingLayout(Spanned workingText) { return new StaticLayout(workingText, getPaint(), getWidth() - getPaddingLeft() - getPaddingRight(), Alignment.ALIGN_NORMAL, lineSpacingMultiplier, lineAdditionalVerticalPadding, false /* includepad */); } @Override public void setEllipsize(TruncateAt where) { // Ellipsize settings are not respected } }
对于那些有兴趣的人，这里是一个C＃Xamarin.Android端口弥可的可爱的解决scheme：
public delegate void EllipsizeEvent(bool ellipsized); public class EllipsizingTextView : TextView { private const string Ellipsis = "..."; public event EllipsizeEvent EllipsizeStateChanged; private bool isEllipsized; private bool isStale; private bool programmaticChange; private string fullText; private int maxLines = -1; private float lineSpacingMultiplier = 1.0f; private float lineAdditionalVerticalPadding; public EllipsizingTextView(Context context) : base(context) { } public EllipsizingTextView(Context context, IAttributeSet attrs) : base(context, attrs) { } public EllipsizingTextView(Context context, IAttributeSet attrs, int defStyle) : base(context, attrs, defStyle) { } public EllipsizingTextView(IntPtr javaReference, JniHandleOwnership transfer) : base(javaReference, transfer) { } public bool IsEllipsized { get { return isEllipsized; } } public override void SetMaxLines(int maxLines) { base.SetMaxLines(maxLines); this.maxLines = maxLines; isStale = true; } public int GetMaxLines() { return maxLines; } public override void SetLineSpacing(float add, float mult) { lineAdditionalVerticalPadding = add; lineSpacingMultiplier = mult; base.SetLineSpacing(add, mult); } protected override void OnTextChanged(ICharSequence text, int start, int before, int after) { base.OnTextChanged(text, start, before, after); if (!programmaticChange) { fullText = text.ToString(); isStale = true; } } protected override void OnDraw(Canvas canvas) { if (isStale) { base.Ellipsize = null; ResetText(); } base.OnDraw(canvas); } private void ResetText() { int maxLines = GetMaxLines(); string workingText = fullText; bool ellipsized = false; if (maxLines != -1) { Layout layout = CreateWorkingLayout(workingText); if (layout.LineCount > maxLines) { workingText = fullText.Substring(0, layout.GetLineEnd(maxLines - 1)).Trim(); while (CreateWorkingLayout(workingText + Ellipsis).LineCount > maxLines) { int lastSpace = workingText.LastIndexOf(' '); if (lastSpace == -1) { break; } workingText = workingText.Substring(0, lastSpace); } workingText = workingText + Ellipsis; ellipsized = true; } } if (workingText != Text) { programmaticChange = true; try { Text = workingText; } finally { programmaticChange = false; } } isStale = false; if (ellipsized != isEllipsized) { isEllipsized = ellipsized; if (EllipsizeStateChanged != null) EllipsizeStateChanged(ellipsized); } } private Layout CreateWorkingLayout(string workingText) { return new StaticLayout(workingText, Paint, Width - PaddingLeft - PaddingRight, Layout.Alignment.AlignNormal, lineSpacingMultiplier, lineAdditionalVerticalPadding, false); } public override TextUtils.TruncateAt Ellipsize { get { return base.Ellipsize; } set { } } }
代码工作得很好！ 你可以重载onSizeChanged方法，如果不只是文本必须改变。
@Override protected void onSizeChanged (int w, int h, int oldw, int oldh) { isStale = true; super.onSizeChanged(w, h, oldw, oldh); }
只需在您的活动中添加代码
Textview.setEllipsize(TextUtils.TruncateAt.END)
这将在textview的末尾添加省略号
扩展TextView并覆盖这些方法：
CharSequence origText = ""; int maxLines = 2; @Override public void setText(CharSequence text, BufferType type) { super.setText(text, type); origText = text; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); CharSequence text = origText; onPreDraw(); while(getLineCount() > maxLines) { text = text.subSequence(0, text.length()-1); super.setText(text + "..."); super.onMeasure(widthMeasureSpec, heightMeasureSpec); onPreDraw(); } }
这是我的解决scheme。 你可以在我的github上下载demo。 https://github.com/krossford/KrossLib/tree/master/android-project
这个截图是一个maxLines = 4的演示，我认为它效果很好。
package com.krosshuang.krosslib.lib.view; import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.widget.TextView; import java.util.ArrayList; /*如何使用？ How to use it? > 1.在xml或者java代码中常规使用> 1.use it like other views on xml and java code. > 2.[必须] setMaxLines 方法替代在xml中的 "android:maxLines" 属性> 2.[must] call the setMaxLines method to instead of the xml property android:maxLines. > 3.[可选] 注意调用 setMultilineEllipsizeMode() 方法，具体请查看注释> 3.[option] you can invoke setMultilineEllipsizeMode method, but I have not implement it. */ /** * android自己的TextView对多行ellipsize处理的不好* Created by krosshuang on 2015/12/17. */ public class EllipsizeEndTextView extends TextView { private static final String LOG_TAG = "EllipsizeTextView"; /** 每一行都有省略号 */ //TODO 该特性待完成public static final int MODE_EACH_LINE = 1; /** 最后一行才有省略号 */ public static final int MODE_LAST_LINE = 2; private static final String ELLIPSIZE = "..."; private ArrayList<String> mTextLines = new ArrayList<String>(); private CharSequence mSrcText = null; private int mMultilineEllipsizeMode = MODE_LAST_LINE; private int mMaxLines = 1; private boolean mNeedIgnoreTextChangeAndSelfInvoke = false; public EllipsizeEndTextView(Context context) { super(context); } public EllipsizeEndTextView(Context context, AttributeSet attrs) { super(context, attrs); } public EllipsizeEndTextView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { if (!mNeedIgnoreTextChangeAndSelfInvoke) { super.onTextChanged(text, start, lengthBefore, lengthAfter); mSrcText = text; } } @Override public void setMaxLines(int maxlines) { super.setMaxLines(maxlines); mMaxLines = maxlines; } public int getSupportedMaxLines() { return mMaxLines; } @Override protected void onDraw(Canvas canvas) { setVisibleText(); super.onDraw(canvas); mNeedIgnoreTextChangeAndSelfInvoke = false; } private void setVisibleText() { if (mSrcText == null) { return; } //获得可使用的width get available width final int aw = getWidth() - getPaddingLeft() - getPaddingRight(); String srcText = mSrcText.toString(); //将原始的string先按原始数据中存在的换行符弄成多行stringString[] lines = srcText.split("\n"); //Log.i(LOG_TAG, "原始数据有: " + lines.length + " 行 " + Arrays.toString(lines)); int maxLines = getSupportedMaxLines(); //将原始文本分成几行后joinlist mTextLines.clear(); for (int i = 0; i < lines.length; i++) { mTextLines.add(lines[i]); } switch (mMultilineEllipsizeMode) { case MODE_EACH_LINE: break; default: case MODE_LAST_LINE: //开始遍历String eachLine = null; for (int i = 0; i < mTextLines.size() && i < maxLines - 1; i++) { eachLine = mTextLines.get(i); if (getPaint().measureText(eachLine, 0, eachLine.length()) > aw) { //当前行超过可用宽度boolean isOut = true; int end = eachLine.length() - 1; while (isOut) { if (getPaint().measureText(eachLine.substring(0, end), 0, end) > aw) { end--; } else { isOut = false; } } mTextLines.set(i, eachLine.substring(0, end)); //当前行设置为裁剪后的mTextLines.add(i + 1, eachLine.substring(end, eachLine.length())); //将裁剪剩余的部分，join下一行，刚好接下来发生的遍历就可以处理它，相当于一个recursion} } //遍历处理结束，所有的行都是在可用宽度以内的break; } //根据 maxLines 和 结果的行数，决定最小需要多less行int resultSize = Math.min(maxLines, mTextLines.size()); //对最后一行做处理String lastLine = mTextLines.get(resultSize - 1); //最后一行有两种情况需要加... //1.最后一行数据本身很长，超过了可用宽度，那么裁剪后尾部加上... //2.最后一行不是很长，并没有超过可用宽度，但是它底下还有行没有显示，因此加上... if (getPaint().measureText(lastLine, 0, lastLine.length()) > aw || resultSize < mTextLines.size()) { boolean isOut = true; int end = lastLine.length(); while (isOut) { if (getPaint().measureText(lastLine.substring(0, end) + ELLIPSIZE, 0, end + 3) > aw) { end--; } else { isOut = false; } } mTextLines.set(resultSize - 1, lastLine.substring(0, end) + ELLIPSIZE); } //开始构build结果StringBuilder sb = new StringBuilder(); for (int i = 0; i < resultSize ; i++) { sb.append(mTextLines.get(i)); if (i != resultSize - 1) { sb.append('\n'); } } //构build完成，set if (sb.toString().equals(getText())) { return; } else { mNeedIgnoreTextChangeAndSelfInvoke = true; setText(sb.toString()); } } /** * 设置ellipsize mode，暂时不支持* @deprecated * */ public void setMultilineEllipsizeMode(int mode) { mMultilineEllipsizeMode = mode; } }存在的换行符弄成多行stringpackage com.krosshuang.krosslib.lib.view; import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.widget.TextView; import java.util.ArrayList; /*如何使用？ How to use it? > 1.在xml或者java代码中常规使用> 1.use it like other views on xml and java code. > 2.[必须] setMaxLines 方法替代在xml中的 "android:maxLines" 属性> 2.[must] call the setMaxLines method to instead of the xml property android:maxLines. > 3.[可选] 注意调用 setMultilineEllipsizeMode() 方法，具体请查看注释> 3.[option] you can invoke setMultilineEllipsizeMode method, but I have not implement it. */ /** * android自己的TextView对多行ellipsize处理的不好* Created by krosshuang on 2015/12/17. */ public class EllipsizeEndTextView extends TextView { private static final String LOG_TAG = "EllipsizeTextView"; /** 每一行都有省略号 */ //TODO 该特性待完成public static final int MODE_EACH_LINE = 1; /** 最后一行才有省略号 */ public static final int MODE_LAST_LINE = 2; private static final String ELLIPSIZE = "..."; private ArrayList<String> mTextLines = new ArrayList<String>(); private CharSequence mSrcText = null; private int mMultilineEllipsizeMode = MODE_LAST_LINE; private int mMaxLines = 1; private boolean mNeedIgnoreTextChangeAndSelfInvoke = false; public EllipsizeEndTextView(Context context) { super(context); } public EllipsizeEndTextView(Context context, AttributeSet attrs) { super(context, attrs); } public EllipsizeEndTextView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { if (!mNeedIgnoreTextChangeAndSelfInvoke) { super.onTextChanged(text, start, lengthBefore, lengthAfter); mSrcText = text; } } @Override public void setMaxLines(int maxlines) { super.setMaxLines(maxlines); mMaxLines = maxlines; } public int getSupportedMaxLines() { return mMaxLines; } @Override protected void onDraw(Canvas canvas) { setVisibleText(); super.onDraw(canvas); mNeedIgnoreTextChangeAndSelfInvoke = false; } private void setVisibleText() { if (mSrcText == null) { return; } //获得可使用的width get available width final int aw = getWidth() - getPaddingLeft() - getPaddingRight(); String srcText = mSrcText.toString(); //将原始的string先按原始数据中存在的换行符弄成多行stringString[] lines = srcText.split("\n"); //Log.i(LOG_TAG, "原始数据有: " + lines.length + " 行 " + Arrays.toString(lines)); int maxLines = getSupportedMaxLines(); //将原始文本分成几行后joinlist mTextLines.clear(); for (int i = 0; i < lines.length; i++) { mTextLines.add(lines[i]); } switch (mMultilineEllipsizeMode) { case MODE_EACH_LINE: break; default: case MODE_LAST_LINE: //开始遍历String eachLine = null; for (int i = 0; i < mTextLines.size() && i < maxLines - 1; i++) { eachLine = mTextLines.get(i); if (getPaint().measureText(eachLine, 0, eachLine.length()) > aw) { //当前行超过可用宽度boolean isOut = true; int end = eachLine.length() - 1; while (isOut) { if (getPaint().measureText(eachLine.substring(0, end), 0, end) > aw) { end--; } else { isOut = false; } } mTextLines.set(i, eachLine.substring(0, end)); //当前行设置为裁剪后的mTextLines.add(i + 1, eachLine.substring(end, eachLine.length())); //将裁剪剩余的部分，join下一行，刚好接下来发生的遍历就可以处理它，相当于一个recursion} } //遍历处理结束，所有的行都是在可用宽度以内的break; } //根据 maxLines 和 结果的行数，决定最小需要多less行int resultSize = Math.min(maxLines, mTextLines.size()); //对最后一行做处理String lastLine = mTextLines.get(resultSize - 1); //最后一行有两种情况需要加... //1.最后一行数据本身很长，超过了可用宽度，那么裁剪后尾部加上... //2.最后一行不是很长，并没有超过可用宽度，但是它底下还有行没有显示，因此加上... if (getPaint().measureText(lastLine, 0, lastLine.length()) > aw || resultSize < mTextLines.size()) { boolean isOut = true; int end = lastLine.length(); while (isOut) { if (getPaint().measureText(lastLine.substring(0, end) + ELLIPSIZE, 0, end + 3) > aw) { end--; } else { isOut = false; } } mTextLines.set(resultSize - 1, lastLine.substring(0, end) + ELLIPSIZE); } //开始构build结果StringBuilder sb = new StringBuilder(); for (int i = 0; i < resultSize ; i++) { sb.append(mTextLines.get(i)); if (i != resultSize - 1) { sb.append('\n'); } } //构build完成，set if (sb.toString().equals(getText())) { return; } else { mNeedIgnoreTextChangeAndSelfInvoke = true; setText(sb.toString()); } } /** * 设置ellipsize mode，暂时不支持* @deprecated * */ public void setMultilineEllipsizeMode(int mode) { mMultilineEllipsizeMode = mode; } }它package com.krosshuang.krosslib.lib.view; import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.widget.TextView; import java.util.ArrayList; /*如何使用？ How to use it? > 1.在xml或者java代码中常规使用> 1.use it like other views on xml and java code. > 2.[必须] setMaxLines 方法替代在xml中的 "android:maxLines" 属性> 2.[must] call the setMaxLines method to instead of the xml property android:maxLines. > 3.[可选] 注意调用 setMultilineEllipsizeMode() 方法，具体请查看注释> 3.[option] you can invoke setMultilineEllipsizeMode method, but I have not implement it. */ /** * android自己的TextView对多行ellipsize处理的不好* Created by krosshuang on 2015/12/17. */ public class EllipsizeEndTextView extends TextView { private static final String LOG_TAG = "EllipsizeTextView"; /** 每一行都有省略号 */ //TODO 该特性待完成public static final int MODE_EACH_LINE = 1; /** 最后一行才有省略号 */ public static final int MODE_LAST_LINE = 2; private static final String ELLIPSIZE = "..."; private ArrayList<String> mTextLines = new ArrayList<String>(); private CharSequence mSrcText = null; private int mMultilineEllipsizeMode = MODE_LAST_LINE; private int mMaxLines = 1; private boolean mNeedIgnoreTextChangeAndSelfInvoke = false; public EllipsizeEndTextView(Context context) { super(context); } public EllipsizeEndTextView(Context context, AttributeSet attrs) { super(context, attrs); } public EllipsizeEndTextView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { if (!mNeedIgnoreTextChangeAndSelfInvoke) { super.onTextChanged(text, start, lengthBefore, lengthAfter); mSrcText = text; } } @Override public void setMaxLines(int maxlines) { super.setMaxLines(maxlines); mMaxLines = maxlines; } public int getSupportedMaxLines() { return mMaxLines; } @Override protected void onDraw(Canvas canvas) { setVisibleText(); super.onDraw(canvas); mNeedIgnoreTextChangeAndSelfInvoke = false; } private void setVisibleText() { if (mSrcText == null) { return; } //获得可使用的width get available width final int aw = getWidth() - getPaddingLeft() - getPaddingRight(); String srcText = mSrcText.toString(); //将原始的string先按原始数据中存在的换行符弄成多行stringString[] lines = srcText.split("\n"); //Log.i(LOG_TAG, "原始数据有: " + lines.length + " 行 " + Arrays.toString(lines)); int maxLines = getSupportedMaxLines(); //将原始文本分成几行后joinlist mTextLines.clear(); for (int i = 0; i < lines.length; i++) { mTextLines.add(lines[i]); } switch (mMultilineEllipsizeMode) { case MODE_EACH_LINE: break; default: case MODE_LAST_LINE: //开始遍历String eachLine = null; for (int i = 0; i < mTextLines.size() && i < maxLines - 1; i++) { eachLine = mTextLines.get(i); if (getPaint().measureText(eachLine, 0, eachLine.length()) > aw) { //当前行超过可用宽度boolean isOut = true; int end = eachLine.length() - 1; while (isOut) { if (getPaint().measureText(eachLine.substring(0, end), 0, end) > aw) { end--; } else { isOut = false; } } mTextLines.set(i, eachLine.substring(0, end)); //当前行设置为裁剪后的mTextLines.add(i + 1, eachLine.substring(end, eachLine.length())); //将裁剪剩余的部分，join下一行，刚好接下来发生的遍历就可以处理它，相当于一个recursion} } //遍历处理结束，所有的行都是在可用宽度以内的break; } //根据 maxLines 和 结果的行数，决定最小需要多less行int resultSize = Math.min(maxLines, mTextLines.size()); //对最后一行做处理String lastLine = mTextLines.get(resultSize - 1); //最后一行有两种情况需要加... //1.最后一行数据本身很长，超过了可用宽度，那么裁剪后尾部加上... //2.最后一行不是很长，并没有超过可用宽度，但是它底下还有行没有显示，因此加上... if (getPaint().measureText(lastLine, 0, lastLine.length()) > aw || resultSize < mTextLines.size()) { boolean isOut = true; int end = lastLine.length(); while (isOut) { if (getPaint().measureText(lastLine.substring(0, end) + ELLIPSIZE, 0, end + 3) > aw) { end--; } else { isOut = false; } } mTextLines.set(resultSize - 1, lastLine.substring(0, end) + ELLIPSIZE); } //开始构build结果StringBuilder sb = new StringBuilder(); for (int i = 0; i < resultSize ; i++) { sb.append(mTextLines.get(i)); if (i != resultSize - 1) { sb.append('\n'); } } //构build完成，set if (sb.toString().equals(getText())) { return; } else { mNeedIgnoreTextChangeAndSelfInvoke = true; setText(sb.toString()); } } /** * 设置ellipsize mode，暂时不支持* @deprecated * */ public void setMultilineEllipsizeMode(int mode) { mMultilineEllipsizeMode = mode; } }的package com.krosshuang.krosslib.lib.view; import android.content.Context; import android.graphics.Canvas; import android.util.AttributeSet; import android.widget.TextView; import java.util.ArrayList; /*如何使用？ How to use it? > 1.在xml或者java代码中常规使用> 1.use it like other views on xml and java code. > 2.[必须] setMaxLines 方法替代在xml中的 "android:maxLines" 属性> 2.[must] call the setMaxLines method to instead of the xml property android:maxLines. > 3.[可选] 注意调用 setMultilineEllipsizeMode() 方法，具体请查看注释> 3.[option] you can invoke setMultilineEllipsizeMode method, but I have not implement it. */ /** * android自己的TextView对多行ellipsize处理的不好* Created by krosshuang on 2015/12/17. */ public class EllipsizeEndTextView extends TextView { private static final String LOG_TAG = "EllipsizeTextView"; /** 每一行都有省略号 */ //TODO 该特性待完成public static final int MODE_EACH_LINE = 1; /** 最后一行才有省略号 */ public static final int MODE_LAST_LINE = 2; private static final String ELLIPSIZE = "..."; private ArrayList<String> mTextLines = new ArrayList<String>(); private CharSequence mSrcText = null; private int mMultilineEllipsizeMode = MODE_LAST_LINE; private int mMaxLines = 1; private boolean mNeedIgnoreTextChangeAndSelfInvoke = false; public EllipsizeEndTextView(Context context) { super(context); } public EllipsizeEndTextView(Context context, AttributeSet attrs) { super(context, attrs); } public EllipsizeEndTextView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onTextChanged(CharSequence text, int start, int lengthBefore, int lengthAfter) { if (!mNeedIgnoreTextChangeAndSelfInvoke) { super.onTextChanged(text, start, lengthBefore, lengthAfter); mSrcText = text; } } @Override public void setMaxLines(int maxlines) { super.setMaxLines(maxlines); mMaxLines = maxlines; } public int getSupportedMaxLines() { return mMaxLines; } @Override protected void onDraw(Canvas canvas) { setVisibleText(); super.onDraw(canvas); mNeedIgnoreTextChangeAndSelfInvoke = false; } private void setVisibleText() { if (mSrcText == null) { return; } //获得可使用的width get available width final int aw = getWidth() - getPaddingLeft() - getPaddingRight(); String srcText = mSrcText.toString(); //将原始的string先按原始数据中存在的换行符弄成多行stringString[] lines = srcText.split("\n"); //Log.i(LOG_TAG, "原始数据有: " + lines.length + " 行 " + Arrays.toString(lines)); int maxLines = getSupportedMaxLines(); //将原始文本分成几行后joinlist mTextLines.clear(); for (int i = 0; i < lines.length; i++) { mTextLines.add(lines[i]); } switch (mMultilineEllipsizeMode) { case MODE_EACH_LINE: break; default: case MODE_LAST_LINE: //开始遍历String eachLine = null; for (int i = 0; i < mTextLines.size() && i < maxLines - 1; i++) { eachLine = mTextLines.get(i); if (getPaint().measureText(eachLine, 0, eachLine.length()) > aw) { //当前行超过可用宽度boolean isOut = true; int end = eachLine.length() - 1; while (isOut) { if (getPaint().measureText(eachLine.substring(0, end), 0, end) > aw) { end--; } else { isOut = false; } } mTextLines.set(i, eachLine.substring(0, end)); //当前行设置为裁剪后的mTextLines.add(i + 1, eachLine.substring(end, eachLine.length())); //将裁剪剩余的部分，join下一行，刚好接下来发生的遍历就可以处理它，相当于一个recursion} } //遍历处理结束，所有的行都是在可用宽度以内的break; } //根据 maxLines 和 结果的行数，决定最小需要多less行int resultSize = Math.min(maxLines, mTextLines.size()); //对最后一行做处理String lastLine = mTextLines.get(resultSize - 1); //最后一行有两种情况需要加... //1.最后一行数据本身很长，超过了可用宽度，那么裁剪后尾部加上... //2.最后一行不是很长，并没有超过可用宽度，但是它底下还有行没有显示，因此加上... if (getPaint().measureText(lastLine, 0, lastLine.length()) > aw || resultSize < mTextLines.size()) { boolean isOut = true; int end = lastLine.length(); while (isOut) { if (getPaint().measureText(lastLine.substring(0, end) + ELLIPSIZE, 0, end + 3) > aw) { end--; } else { isOut = false; } } mTextLines.set(resultSize - 1, lastLine.substring(0, end) + ELLIPSIZE); } //开始构build结果StringBuilder sb = new StringBuilder(); for (int i = 0; i < resultSize ; i++) { sb.append(mTextLines.get(i)); if (i != resultSize - 1) { sb.append('\n'); } } //构build完成，set if (sb.toString().equals(getText())) { return; } else { mNeedIgnoreTextChangeAndSelfInvoke = true; setText(sb.toString()); } } /** * 设置ellipsize mode，暂时不支持* @deprecated * */ public void setMultilineEllipsizeMode(int mode) { mMultilineEllipsizeMode = mode; } }
我曾经也有过一样的问题。 我通过删除android：ellipsize =“marquee”来修复它
这个也处理我的html，
/* * Copyright (C) 2013 Google Inc. * Licensed to The Android Open Source Project. * * 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. */ package com.android.mail.ui; import android.content.Context; import android.content.res.TypedArray; 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.util.AttributeSet; import android.widget.TextView; /** * A special MultiLine TextView that will apply ellipsize logic to only the last * line of text, such that the last line may be shorter than any previous lines. */ public class EllipsizedMultilineTextView extends TextView { public static final int ALL_AVAILABLE = -1; private int mMaxLines; public EllipsizedMultilineTextView(Context context) { super(context); } public EllipsizedMultilineTextView(Context context, AttributeSet attrs) { super(context, attrs); init(context, attrs); } public EllipsizedMultilineTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context, attrs); } private final void init(Context context, AttributeSet attrs) { final TypedArray a = context.obtainStyledAttributes(attrs, new int[] { android.R.attr.maxLines }); setMaxLines(a.getInt(0, 2)); } @Override public void setMaxLines(int maxlines) { super.setMaxLines(maxlines); mMaxLines = maxlines; } /** * Ellipsize just the last line of text in this view and set the text to the * new ellipsized value. * @param text Text to set and ellipsize * @param avail available width in pixels for the last line * @param paint Paint that has the proper properties set to measure the text * for this view * @return the {@link CharSequence} that was set on the {@link TextView} */ public CharSequence setText(final CharSequence text, int avail) { if (text == null || text.length() == 0) { return text; } setEllipsize(null); setText(text); if (avail == ALL_AVAILABLE) { return text; } Layout layout = getLayout(); if (layout == null) { final int w = getWidth() - getCompoundPaddingLeft() - getCompoundPaddingRight(); layout = new StaticLayout(text, 0, text.length(), getPaint(), w, Alignment.ALIGN_NORMAL, 1.0f, 0f, false); } // find the last line of text and chop it according to available space final int lastLineStart = layout.getLineStart(mMaxLines - 1); final CharSequence remainder = TextUtils.ellipsize(text.subSequence(lastLineStart, text.length()), getPaint(), avail, TextUtils.TruncateAt.END); // assemble just the text portion, without spans final SpannableStringBuilder builder = new SpannableStringBuilder(); builder.append(text.toString(), 0, lastLineStart); if (!TextUtils.isEmpty(remainder)) { builder.append(remainder.toString()); } // Now copy the original spans into the assembled string, modified for any ellipsizing. // // Merely assembling the Spanned pieces together would result in duplicate CharacterStyle // spans in the assembled version if a CharacterStyle spanned across the lastLineStart // offset. if (text instanceof Spanned) { final Spanned s = (Spanned) text; final Object[] spans = s.getSpans(0, s.length(), Object.class); final int destLen = builder.length(); for (int i = 0; i < spans.length; i++) { final Object span = spans[i]; final int start = s.getSpanStart(span); final int end = s.getSpanEnd(span); final int flags = s.getSpanFlags(span); if (start <= destLen) { builder.setSpan(span, start, Math.min(end, destLen), flags); } } } setText(builder); return builder; } }
Orignal Source LINK
Try implementing this way
android:maxLines="1" android:ellipsize="end" android:scrollHorizontally="true"
scrollHorizontally is the key to ...
The top answer here from Micah Hainline works great, but even better is the library that was built from it by user aleb as he posted in the comments under Micahs answer:
I created an Android library with this component and changed it to be able to show as many lines of text as possible and ellipsize the last one; see github.com/triposo/barone
There are some more features to it, if you only need the TextView, it is here .
Maybe this will help others find it faster than I did 🙂
To add ... in the end of the second line, saving 1 line if text is short:
android:maxLines="2" android:ellipsize="end"
This is late, but I found an Apache licensed class from Android, that's used in the stock mail app: https://android.googlesource.com/platform/packages/apps/UnifiedEmail/+/184ec73/src/com/android/mail/ui/EllipsizedMultilineTextView.java
/* * Copyright (C) 2013 Google Inc. * Licensed to The Android Open Source Project. * * 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. */ package com.android.mail.ui; import android.content.Context; 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.util.AttributeSet; import android.widget.TextView; /** * A special MultiLine TextView that will apply ellipsize logic to only the last * line of text, such that the last line may be shorter than any previous lines. */ public class EllipsizedMultilineTextView extends TextView { public static final int ALL_AVAILABLE = -1; private int mMaxLines; public EllipsizedMultilineTextView(Context context) { this(context, null); } public EllipsizedMultilineTextView(Context context, AttributeSet attrs) { super(context, attrs); } @Override public void setMaxLines(int maxlines) { super.setMaxLines(maxlines); mMaxLines = maxlines; } /** * Ellipsize just the last line of text in this view and set the text to the * new ellipsized value. * @param text Text to set and ellipsize * @param avail available width in pixels for the last line * @param paint Paint that has the proper properties set to measure the text * for this view * @return the {@link CharSequence} that was set on the {@link TextView} */ public CharSequence setText(final CharSequence text, int avail) { if (text == null || text.length() == 0) { return text; } setEllipsize(null); setText(text); if (avail == ALL_AVAILABLE) { return text; } Layout layout = getLayout(); if (layout == null) { final int w = getWidth() - getCompoundPaddingLeft() - getCompoundPaddingRight(); layout = new StaticLayout(text, 0, text.length(), getPaint(), w, Alignment.ALIGN_NORMAL, 1.0f, 0f, false); } // find the last line of text and chop it according to available space final int lastLineStart = layout.getLineStart(mMaxLines - 1); final CharSequence remainder = TextUtils.ellipsize(text.subSequence(lastLineStart, text.length()), getPaint(), avail, TextUtils.TruncateAt.END); // assemble just the text portion, without spans final SpannableStringBuilder builder = new SpannableStringBuilder(); builder.append(text.toString(), 0, lastLineStart); if (!TextUtils.isEmpty(remainder)) { builder.append(remainder.toString()); } // Now copy the original spans into the assembled string, modified for any ellipsizing. // // Merely assembling the Spanned pieces together would result in duplicate CharacterStyle // spans in the assembled version if a CharacterStyle spanned across the lastLineStart // offset. if (text instanceof Spanned) { final Spanned s = (Spanned) text; final Object[] spans = s.getSpans(0, s.length(), Object.class); final int destLen = builder.length(); for (int i = 0; i < spans.length; i++) { final Object span = spans[i]; final int start = s.getSpanStart(span); final int end = s.getSpanEnd(span); final int flags = s.getSpanFlags(span); if (start <= destLen) { builder.setSpan(span, start, Math.min(end, destLen), flags); } } } setText(builder); return builder; } }
There are a few attributes you should check: android:lines, android:minLines, android:maxLines. To display a maximum of 4 lines and ellipsize it, you just need android:maxLines and android:ellipsize:
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:maxLines="4" android:ellipsize="marquee" android:text="Hai!" />
You need to include this in your textview:
android:singleLine="false"
by default its true. You need to explicitly set it false.
