Android многоточечный многострочный просмотр текста

Мне нужно создать многострочное текстовое представление. Мой компонент достаточно большой, чтобы отображать как минимум 4 строки с эллипсом, но отображаются только 2 строки. Я попытался изменить минимальное и максимальное количество строк компонента, но это ничего не меняет.

Вот решение проблемы. Это подкласс TextView, который на самом деле работает для многоточия. Код android-textview-multiline-ellipse, приведенный в предыдущем ответе, который, как я обнаружил, содержит ошибки при определенных обстоятельствах, а также находится под лицензией GPL, что на самом деле не работает для большинства из нас. Вы можете свободно использовать этот код без указания авторства или по лицензии Apache, если хотите. Обратите внимание, что есть слушатель, который уведомит вас, когда текст станет эллиптическим, что я сам нашел весьма полезным.

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
    }
}

В моем приложении у меня была похожая проблема: 2 строки и, в конце концов, добавьте «...», если строка была слишком длинной. Я использовал этот код в XML-файле в теге textview:

android:maxLines="2"
android:ellipsize="end"
android:singleLine="false"

Я тоже столкнулся с этой проблемой. Есть довольно старая ошибка, которая остается без ответа: Ошибка 2254

Попробуйте это, это работает для меня, у меня есть 4 строки, и это добавляет «...» в конце последней / четвертой строки. Это так же, как ответ морали, но у меня там есть singeLine = "false".

<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!" />

Получил эту проблему, и, наконец, я строю себе краткое решение. Вам просто нужно вручную увеличить размер нужной строки, ваш атрибут maxLine обрежет ваш текст.

Этот пример вырезал ваш текст максимум на 3 строки

        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);
                }

            }
        });

Я объединил решения Мика Хэйнлайна, Алекса Бэлуза и Пола Имхоффа, чтобы создать многострочную форму, TextViewкоторая также поддерживает Spannedтекст.

Вам нужно только установить android:ellipsizeи 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);
        }
    }
}

Полный источник: EllipsizingTextView.java

В моем случае нет необходимости кодировать это на Java. Все работает как положено. Не нужно что-то подобное android:singleLine="false".

<TextView
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:ellipsize="end"
  android:maxLines="4"
  android:text="@string/very_long_text" />

Но, похоже, в предварительном просмотре Android Studio (v3.0) есть ошибка:

Учитывая Android 7.1.1 на моем устройстве это работает:

Основываясь на решениях Майка Хэйнлайна и комментария Алебса, я пришел со следующим подходом, который работает с Spanned текстами, так что, например, myTextView.setText(Html.fromHtml("<b>Testheader</b> - Testcontent"));работает! Обратите внимание, что это работает только Spannedсейчас. Это может быть изменено для работы Stringи так Spannedили иначе.

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
      }
}

Для тех, кто заинтересован, вот порт C # Xamarin.Android прекрасного решения Мики:

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 
        { 
        }
    }
}

Чтобы добавить ...в конец второй строки, сохраняя 1 строку, если текст короткий:

android:maxLines="2"
android:ellipsize="end"

Просто добавьте код в вашу деятельность

Textview.setEllipsize(TextUtils.TruncateAt.END)

это добавит многоточие в конце текстового обзора

Расширьте TextView и переопределите эти методы:

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();
    }

}

Это моё решение. Вы можете скачать демо на моем github. https://github.com/krossford/KrossLib/tree/master/android-project

Этот скриншот был демо, которое maxLines = 4, я думаю, работает хорошо.

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();

        //将原始的字符串先按原始数据中存在的换行符弄成多行字符串
        String[] 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加入list
        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，加入下一行，刚好接下来发生的遍历就可以处理它，相当于一个递归

                    }
                }

                //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，决定最小需要多少行
        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);
        }

        //开始构建结果
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i <  resultSize ; i++) {
            sb.append(mTextLines.get(i));
            if (i != resultSize - 1) {
                sb.append('\n');
            }
        }

        //构建完成，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;
    }
}

У меня была такая же проблема. Я исправил это, просто удалив android: ellipsize = "marquee"

Код работал очень хорошо! Вы можете перегружать метод onSizeChanged, если нужно изменить не только текст.

@Override
protected void onSizeChanged (int w, int h, int oldw, int oldh) {
    isStale = true;
    super.onSizeChanged(w, h, oldw, oldh);
}

Этот также обрабатывал мой 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;
    }
}

Исходный источник ССЫЛКА

Главный ответ от Micah Hainline прекрасно работает, но еще лучше то, что библиотека, созданная из него пользователем aleb, который он разместил в комментариях под ответом Micahs:

Я создал библиотеку Android с этим компонентом и изменил его, чтобы можно было отображать как можно больше строк текста и увеличивать размер последнего; см. github.com/triposo/barone

Есть еще несколько функций, если вам нужен только TextView, он здесь .

Может быть, это поможет другим найти его быстрее, чем я :-)

Уже поздно, но я нашел лицензионный класс Apache от Android, который используется в стандартном почтовом приложении: https://android.googlesource.com/platform/packages/apps/UnifiedEmail/+/184ec73/src/com/android/ почта / щ / 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;
    }
}