Example usage for android.text StaticLayout getLineStart

Introduction

In this page you can find the example usage for android.text StaticLayout getLineStart.

Prototype

@Override
    public int getLineStart(int line) 

Source Link

Usage

From source file:org.wikipedia.page.shareafact.SnippetImage.java

/**
 * If the title or text is too long we first reduce the font size.
 * If that is not enough it gets ellipsized.
 */// w ww . java  2  s. c o m
private static StaticLayout optimizeTextSize(TextLayoutParams params, int maxHeight, int maxLines,
        float maxFontSize, float minFontSize) {
    final float threshold1 = 60.0f;
    final float threshold2 = 40.0f;
    final float extraStep1 = 3.0f;
    final float extraStep2 = 1.0f;
    boolean fits = false;
    StaticLayout textLayout = null;

    // Try decreasing font size first
    for (float fontSize = maxFontSize; fontSize >= minFontSize; fontSize -= 1.0f) {
        params.textPaint.setTextSize(fontSize);
        textLayout = buildLayout(params);
        if (textLayout.getHeight() <= maxHeight) {
            fits = true;
            break;
        }

        // make it go faster at the beginning...
        if (fontSize > threshold1) {
            fontSize -= extraStep1;
        } else if (fontSize > threshold2) {
            fontSize -= extraStep2;
        }
    }

    // Then do own ellipsize: cut text off after last fitting space and add "..."
    // Didn't want to cut off randomly in the middle of a line or word.
    if (!fits) {
        final String textStr = params.text.toString();
        final int ellipsisLength = 3;
        final int ellipsisStart = textLayout != null ? textLayout.getLineStart(maxLines) - ellipsisLength
                : textStr.length();
        final int end = textStr.lastIndexOf(' ', ellipsisStart) + 1;
        if (end > 0) {
            textLayout = buildLayout(new TextLayoutParams(params, textStr.substring(0, end) + "..."));
            if (textLayout.getLineCount() <= maxLines) {
                fits = true;
            }
        }
    }

    // last resort: use TextUtils.ellipsize()
    if (!fits) {
        final float textRatio = .87f;
        final float maxWidth = textRatio * maxLines * params.lineWidth;
        textLayout = buildLayout(new TextLayoutParams(params,
                TextUtils.ellipsize(params.text, params.textPaint, maxWidth, TextUtils.TruncateAt.END)));
    }

    return textLayout;
}

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From source file:net.opacapp.multilinecollapsingtoolbar.CollapsingTextHelper.java

private void calculateUsingTextSize(final float textSize) {
    if (mText == null)
        return;/*from  w w w. j a va  2s .c  om*/
    final float availableWidth;
    final float newTextSize;
    boolean updateDrawText = false;
    // BEGIN MODIFICATION: Add maxLines variable
    int maxLines;
    // END MODIFICATION
    if (isClose(textSize, mCollapsedTextSize)) {
        availableWidth = mCollapsedBounds.width();
        newTextSize = mCollapsedTextSize;
        mScale = 1f;
        if (mCurrentTypeface != mCollapsedTypeface) {
            mCurrentTypeface = mCollapsedTypeface;
            updateDrawText = true;
        }
        // BEGIN MODIFICATION: Set maxLines variable
        maxLines = 1;
        // END MODIFICATION
    } else {
        availableWidth = mExpandedBounds.width();
        newTextSize = mExpandedTextSize;
        if (mCurrentTypeface != mExpandedTypeface) {
            mCurrentTypeface = mExpandedTypeface;
            updateDrawText = true;
        }
        if (isClose(textSize, mExpandedTextSize)) {
            // If we're close to the expanded text size, snap to it and use a scale of 1
            mScale = 1f;
        } else {
            // Else, we'll scale down from the expanded text size
            mScale = textSize / mExpandedTextSize;
        }
        // BEGIN MODIFICATION: Set maxLines variable
        maxLines = this.maxLines;
        // END MODIFICATION
    }
    if (availableWidth > 0) {
        updateDrawText = (mCurrentTextSize != newTextSize) || mBoundsChanged || updateDrawText;
        mCurrentTextSize = newTextSize;
        mBoundsChanged = false;
    }
    if (mTextToDraw == null || updateDrawText) {
        mTextPaint.setTextSize(mCurrentTextSize);
        mTextPaint.setTypeface(mCurrentTypeface);

        // BEGIN MODIFICATION: Text layout creation and text truncation
        StaticLayout layout = new StaticLayout(mText, mTextPaint, (int) availableWidth,
                Layout.Alignment.ALIGN_NORMAL, 1, 0, false);
        CharSequence truncatedText;
        if (layout.getLineCount() > maxLines) {
            int lastLine = maxLines - 1;
            CharSequence textBefore = lastLine > 0 ? mText.subSequence(0, layout.getLineEnd(lastLine - 1)) : "";
            CharSequence lineText = mText.subSequence(layout.getLineStart(lastLine),
                    layout.getLineEnd(lastLine));
            // if last char in line is space, move it behind the ellipsis
            CharSequence lineEnd = "";
            if (lineText.charAt(lineText.length() - 1) == ' ') {
                lineEnd = lineText.subSequence(lineText.length() - 1, lineText.length());
                lineText = lineText.subSequence(0, lineText.length() - 1);
            }
            // insert ellipsis character
            lineText = TextUtils.concat(lineText, "\u2026", lineEnd);
            // if the text is too long, truncate it
            CharSequence truncatedLineText = TextUtils.ellipsize(lineText, mTextPaint, availableWidth,
                    TextUtils.TruncateAt.END);
            truncatedText = TextUtils.concat(textBefore, truncatedLineText);

        } else {
            truncatedText = mText;
        }
        if (!TextUtils.equals(truncatedText, mTextToDraw)) {
            mTextToDraw = truncatedText;
            mIsRtl = calculateIsRtl(mTextToDraw);
        }

        final Layout.Alignment alignment;

        // Don't rectify gravity for RTL languages, Layout.Alignment does it already.
        switch (mExpandedTextGravity & GravityCompat.RELATIVE_HORIZONTAL_GRAVITY_MASK) {
        case Gravity.CENTER_HORIZONTAL:
            alignment = Layout.Alignment.ALIGN_CENTER;
            break;
        case Gravity.RIGHT:
        case Gravity.END:
            alignment = Layout.Alignment.ALIGN_OPPOSITE;
            break;
        case Gravity.LEFT:
        case Gravity.START:
        default:
            alignment = Layout.Alignment.ALIGN_NORMAL;
            break;
        }

        mTextLayout = new StaticLayout(mTextToDraw, mTextPaint, (int) availableWidth, alignment, 1, 0, false);
        // END MODIFICATION
    }
}

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