StackOverflow2013

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copied!<p>Based on the solutions by Micah Hainline and alebs comment, I came of with the following approach that works with Spanned texts, so that e.g. <code>myTextView.setText(Html.fromHtml("<b>Testheader</b> - Testcontent"));</code> works! Note that this only works with <code>Spanned</code> right now. It could maybe be modified to work with <code>String</code> and <code>Spanned</code> either way.</p> <pre><code>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 } } </code></pre>

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