android.text.Layout#getLineWidth ( )源码实例Demo

private BetterLinkMovementExtended.ClickableSpanWithText findClickableSpanUnderTouch(TextView textView, Spannable text, MotionEvent event) {
    int touchX = (int) event.getX();
    int touchY = (int) event.getY();
    touchX -= textView.getTotalPaddingLeft();
    touchY -= textView.getTotalPaddingTop();
    touchX += textView.getScrollX();
    touchY += textView.getScrollY();
    Layout layout = textView.getLayout();
    int touchedLine = layout.getLineForVertical(touchY);
    int touchOffset = layout.getOffsetForHorizontal(touchedLine, (float) touchX);
    this.touchedLineBounds.left = layout.getLineLeft(touchedLine);
    this.touchedLineBounds.top = (float) layout.getLineTop(touchedLine);
    this.touchedLineBounds.right = layout.getLineWidth(touchedLine) + this.touchedLineBounds.left;
    this.touchedLineBounds.bottom = (float) layout.getLineBottom(touchedLine);
    if (this.touchedLineBounds.contains((float) touchX, (float) touchY)) {
        Object[] spans = text.getSpans(touchOffset, touchOffset, SPAN_CLASS);
        for (Object span : spans) {
            if (span instanceof ClickableSpan) {
                return ClickableSpanWithText.ofSpan(textView, (ClickableSpan) span);
            }
        }
        return null;
    } else {
        return null;
    }
}
 

private float getMaxLineWidth(TextView textView) {
    Layout layout = textView.getLayout();
    float max_width = 0.0f;
    int lines = layout.getLineCount();
    for (int i = 0; i < lines; i++) {
        if (layout.getLineWidth(i) > max_width) {
            max_width = layout.getLineWidth(i);
        }
    }
    return max_width;
}
 

private float getMaxLineWidth(Layout layout) {
    float max_width = 0.0f;
    int lines = layout.getLineCount();
    for (int i = 0; i < lines; i++) {
        if (layout.getLineWidth(i) > max_width) {
            max_width = layout.getLineWidth(i);
        }
    }
    return max_width;
}
 

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);

    if (needCheckDevice && isVivoApi22()) {

        int width = getMeasuredWidth();
        CharSequence charSequence = getText();
        Layout layout = createWorkingLayout(charSequence, getPaint(), width);
        float dotWidth = getPaint().measureText(DOT_SUFFIX);
        int lineCount = layout.getLineCount();
        Log.d(TAG, "onMeasure , lineCount : " + lineCount);
        // 多行且第一行未占满
        if (lineCount > 1 && Math.abs(width - layout.getLineWidth(0)) > dotWidth) {
            Log.d(TAG, "onMeasure , firstLineEndIndex : " + layout.getLineEnd(0));
            int index = layout.getLineEnd(1);
            while (true) {
                index--;
                charSequence = charSequence.subSequence(0, index);
                charSequence = SpannableStringBuilder.valueOf(charSequence).append(DOT_SUFFIX);
                layout = createWorkingLayout(charSequence, getPaint(), width);
                if (layout.getLineCount() == 1 && (width - layout.getLineWidth(0) <= dotWidth || index <= 10)) {
                    mLayout = layout;
                    break;
                }
            }
        }
        needCheckDevice = false;
    }
}
 

private float getMaxLineWidth(Layout layout) {
    float max_width = 0.0f;
    int lines = layout.getLineCount();
    for (int i = 0; i < lines; i++) {
        if (layout.getLineWidth(i) > max_width) {
            max_width = layout.getLineWidth(i);
        }
    }
    return max_width;
}
 

/**
 * Approximates a given lines width with the new provided text size.
 */
private float approximateLineWidth(Layout layout, int line, float textSize) {
    return layout.getLineWidth(line) * (textSize / layout.getPaint().getTextSize());
}
 

/** Approximates a given lines width with the new provided text size. */
private float approximateLineWidth(@NonNull Layout layout, int line, float textSize) {
  return layout.getLineWidth(line) * (textSize / layout.getPaint().getTextSize());
}
 

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    Rect bounds = new Rect();
    Drawable background = getBackground();
    if (background != null) {
        background.getPadding(bounds);
    }

    int wMode = MeasureSpec.getMode(widthMeasureSpec);
    int maxW = MeasureSpec.getSize(widthMeasureSpec) - bounds.left - bounds.right;

    TextView messageView = (TextView) getChildAt(0);
    messageView.measure(MeasureSpec.makeMeasureSpec(maxW, wMode), heightMeasureSpec);
    View timeView = getChildAt(1);
    timeView.measure(MeasureSpec.makeMeasureSpec(maxW, wMode), heightMeasureSpec);

    Layout textLayout = messageView.getLayout();

    int contentW = messageView.getMeasuredWidth();
    int timeW = timeView.getMeasuredWidth();
    boolean isRtl = BidiFormatter.getInstance().isRtl(messageView.getText().toString());

    if (messageView.getLayout().getLineCount() < 5 && !isRtl) {
        contentW = 0;
        for (int i = 0; i < textLayout.getLineCount(); i++) {
            contentW = Math.max(contentW, (int) textLayout.getLineWidth(i));
        }
    }

    int lastLineW = (int) textLayout.getLineWidth(textLayout.getLineCount() - 1);

    if (isRtl) {
        lastLineW = contentW;
    }

    int fullContentW, fullContentH;

    if (isRtl) {
        fullContentW = contentW;
        fullContentH = messageView.getMeasuredHeight() + timeView.getMeasuredHeight();
    } else {
        if (lastLineW + timeW < contentW) {
            // Nothing to do
            fullContentW = contentW;
            fullContentH = messageView.getMeasuredHeight();
        } else if (lastLineW + timeW < maxW) {
            fullContentW = lastLineW + timeW;
            fullContentH = messageView.getMeasuredHeight();
        } else {
            fullContentW = contentW;
            fullContentH = messageView.getMeasuredHeight() + timeView.getMeasuredHeight();
        }
    }

    setMeasuredDimension(fullContentW + bounds.left + bounds.right, fullContentH + bounds.top + bounds.bottom);
}