Java TextPaint.measureText方法代碼示例

import android.text.TextPaint; //導入方法依賴的package包/類
private void drawIndicatorsTextAbove(Canvas canvas, String text, TextPaint paintText, float x, float y, Layout.Alignment alignment) {

        final float textHeight = calculateTextMultilineHeight(text, paintText);
        y -= textHeight;

        final int width = (int) paintText.measureText(text);
        if (x >= getWidth() - settings.paddingCorners) {
            x = (getWidth() - width - settings.paddingCorners / 2f);
        } else if (x <= 0) {
            x = width / 2f;
        } else {
            x = (x - width / 2f);
        }

        if (x < 0) {
            x = 0;
        }

        if (x + width > getWidth()) {
            x = getWidth() - width;
        }

        drawText(canvas, text, x, y, paintText, alignment);
    }
 

import android.text.TextPaint; //導入方法依賴的package包/類
/** 獲取字符串寬度 */
public static float GetTextWidth(String Sentence, float Size) {
	if (isEmpty(Sentence))
		return 0;
	TextPaint FontPaint = new TextPaint();
	FontPaint.setTextSize(Size);
	return FontPaint.measureText(Sentence.trim()) + (int) (Size * 0.1); // 留點餘地
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
public void measureTabLayoutTextWidth(int position) {

    String titleName = titles.get(position);
    TextView titleView = mSlidingTab.getTitleView(position);
    TextPaint paint = titleView.getPaint();
    float v = paint.measureText(titleName);
    mSlidingTab.setIndicatorWidth(v / 3);
  }
 

import android.text.TextPaint; //導入方法依賴的package包/類
/**
 * Update list of holders on line.
 *
 * @param backgroundHolder holder of text part
 * @param startInText      start position in text
 * @param endInText        end position in text
 */
private void updateHoldersOnLine(@NonNull Paint p, int left, int right, int top, int baseline,
                                 @NonNull CharSequence text, @NonNull BackgroundHolder backgroundHolder,
                                 int startInText, int endInText) {
    final TextPaint textPaint = getTextPaint(p, text, startInText, endInText);
    final float prevTextWidth = getPrevTextWidth(text);
    float curTextWidth;
    try {
        curTextWidth = textPaint.measureText(text, startInText, endInText);
    } catch (IndexOutOfBoundsException e) {
        // skip drawing. This crashes on Android 4.3 (potentially on all 4.x) devices
        // without `continue` it will draw an empty rectangle with rounded corners (if padding has been set)
        return;
    }
    float l = left;
    float r = right;
    if (mRtlText) {
        r -= prevTextWidth;
        l = r - curTextWidth;
    } else {
        l += prevTextWidth;
        r = l + curTextWidth;
    }
    final float rectLeft = l - mPadding;
    final float rectTop = top - mPadding;
    final float rectRight = r + mPadding;
    final float rectBottom = baseline + p.descent() + mPadding;
    final LineDataHolder lineDataHolder = new LineDataHolder.Builder()
            .setTextPaint(textPaint)
            .setStartIntText(startInText)
            .setEndIntText(endInText)
            .setLeft(rectLeft)
            .setRight(rectRight)
            .setTop(rectTop)
            .setBottom(rectBottom)
            .setBgHolder(backgroundHolder)
            .build();
    mHoldersOnLine.add(lineDataHolder);
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
private void drawText(Canvas canvas, String text, float x, float y, TextPaint paint, Layout.Alignment aligment) {
    canvas.save();
    {
        canvas.translate(x, y);
        final StaticLayout staticLayout = new StaticLayout(text, paint, (int) paint.measureText(text), aligment, 1.0f, 0, false);
        staticLayout.draw(canvas);
    }
    canvas.restore();
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
private void measureTabLayoutTextWidth(int position) {
    String title = mTitles.get(position);
    TextView titleView = mSlidingTab.getTitleView(position);
    TextPaint paint = titleView.getPaint();
    float width = paint.measureText(title);
    mSlidingTab.setIndicatorWidth(width / 3);
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
private void measureTabLayoutTextWidth(int position) {
    String title = mTitles.get(position);
    TextView titleView = mSlidingTabLayout.getTitleView(position);
    TextPaint paint = titleView.getPaint();
    float textWidth = paint.measureText(title);
    mSlidingTabLayout.setIndicatorWidth(textWidth / 3);
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
private int getTextOffsetX(TextPaint paint, String s, int gravity) {
    int width = (int) paint.measureText(s);
    int offset = 0;
    if ((gravity & Gravity.CENTER_HORIZONTAL) != 0) {
        offset = - width / 2;
    } else if ((gravity & Gravity.START) != 0) {
        offset = - width;
    }

    return offset;
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
private void drawMultilineText(Canvas canvas, String text, float x, float y, TextPaint paint, Layout.Alignment aligment) {
    final float lineHeight = paint.getTextSize();
    float lineY = y;
    for (CharSequence line : text.split("\n")) {
        canvas.save();
        {
            final float lineWidth = (int) paint.measureText(line.toString());
            float lineX = x;
            if (aligment == Layout.Alignment.ALIGN_CENTER) {
                lineX -= lineWidth / 2f;
            }
            if (lineX < 0) {
                lineX = 0;
            }

            final float right = lineX + lineWidth;
            if (right > canvas.getWidth()) {
                lineX = canvas.getWidth() - lineWidth - settings.paddingCorners;
            }

            canvas.translate(lineX, lineY);
            final StaticLayout staticLayout = new StaticLayout(line, paint, (int) lineWidth, aligment, 1.0f, 0, false);
            staticLayout.draw(canvas);

            lineY += lineHeight;
        }
        canvas.restore();
    }

}
 

import android.text.TextPaint; //導入方法依賴的package包/類
/**
 * Resize the text size with specified width and height
 * @param width
 * @param height
 */
public void resizeText(int width, int height) {
	CharSequence text = getText();
	// Do not resize if the view does not have dimensions or there is no text
	if (text == null || text.length() == 0 || height <= 0 || width <= 0 || mTextSize == 0) {
		return;
	}

	if (getTransformationMethod() != null) {
		text = getTransformationMethod().getTransformation(text, this);
	}

	// Get the text view's paint object
	TextPaint textPaint = getPaint();

	// Store the current text size
	float oldTextSize = textPaint.getTextSize();
	// If there is a max text size set, use the lesser of that and the default text size
	float targetTextSize = mMaxTextSize > 0 ? Math.min(mTextSize, mMaxTextSize) : mTextSize;

	// Get the required text height
	int textHeight = getTextHeight(text, textPaint, width, targetTextSize);

	// Until we either fit within our text view or we had reached our min text size, incrementally try smaller sizes
	while (textHeight > height && targetTextSize > mMinTextSize) {
		targetTextSize = Math.max(targetTextSize - 2, mMinTextSize);
		textHeight = getTextHeight(text, textPaint, width, targetTextSize);
	}

	// If we had reached our minimum text size and still don't fit, append an ellipsis
	if (mAddEllipsis && targetTextSize == mMinTextSize && textHeight > height) {
		// Draw using a static layout
		// modified: use a copy of TextPaint for measuring
		TextPaint paint = new TextPaint(textPaint);
		// Draw using a static layout
		StaticLayout layout = new StaticLayout(text, paint, width, Layout.Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, false);
		// Check that we have a least one line of rendered text
		if (layout.getLineCount() > 0) {
			// Since the line at the specific vertical position would be cut off,
			// we must trim up to the previous line
			int lastLine = layout.getLineForVertical(height) - 1;
			// If the text would not even fit on a single line, clear it
			if (lastLine < 0) {
				setText("");
			}
			// Otherwise, trim to the previous line and add an ellipsis
			else {
				int start = layout.getLineStart(lastLine);
				int end = layout.getLineEnd(lastLine);
				float lineWidth = layout.getLineWidth(lastLine);
				float ellipseWidth = textPaint.measureText(mEllipsis);

				// Trim characters off until we have enough room to draw the ellipsis
				while (width < lineWidth + ellipseWidth) {
					lineWidth = textPaint.measureText(text.subSequence(start, --end + 1).toString());
				}
				setText(text.subSequence(0, end) + mEllipsis);
			}
		}
	}

	// Some devices try to auto adjust line spacing, so force default line spacing
	// and invalidate the layout as a side effect
	setTextSize(TypedValue.COMPLEX_UNIT_PX, targetTextSize);
	setLineSpacing(mSpacingAdd, mSpacingMult);

	// Notify the listener if registered
	if (mTextResizeListener != null) {
		mTextResizeListener.onTextResize(this, oldTextSize, targetTextSize);
	}

	// Reset force resize flag
	mNeedsResize = false;
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
/**
    * Re-sizes the textSize of the TextView so that the text fits within the bounds of the View.
    */
   private static void autofit(AppCompatTextView view, TextPaint paint, float minTextSize, float maxTextSize,
							int maxLines, float precision)
{
       if (maxLines <= 0 || maxLines == Integer.MAX_VALUE)
	{
           // Don't auto-size since there's no limit on lines.
           return;
       }

       int targetWidth = view.getWidth() - view.getPaddingLeft() - view.getPaddingRight();
       if (targetWidth <= 0)
	{
           return;
       }

       CharSequence text = view.getText();
       TransformationMethod method = view.getTransformationMethod();
       if (method != null)
	{
           text = method.getTransformation(text, view);
       }

       Context context = view.getContext();
       Resources r = Resources.getSystem();
       DisplayMetrics displayMetrics;

       float size = maxTextSize;
       float high = size;
       float low = 0;

       if (context != null)
	{
           r = context.getResources();
       }
       displayMetrics = r.getDisplayMetrics();

       paint.set(view.getPaint());
       paint.setTextSize(size);

       if ((maxLines == 1 && paint.measureText(text, 0, text.length()) > targetWidth)
		|| getLineCount(text, paint, size, targetWidth, displayMetrics) > maxLines)
	{
           size = getAutofitTextSize(text, paint, targetWidth, maxLines, low, high, precision,
								  displayMetrics);
       }

       if (size < minTextSize)
	{
           size = minTextSize;
       }

       view.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
   }
 

import android.text.TextPaint; //導入方法依賴的package包/類
/**
 * Resize the text size with specified width and height
 * @param width
 * @param height
 */
public void resizeText(int width, int height) {
    CharSequence text = getText();
    // Do not resize if the view does not have dimensions or there is no text
    if (text == null || text.length() == 0 || height <= 0 || width <= 0 || mTextSize == 0) {
        return;
    }

    if (getTransformationMethod() != null) {
        text = getTransformationMethod().getTransformation(text, this);
    }

    // Get the text view's paint object
    TextPaint textPaint = getPaint();

    // Store the current text size
    float oldTextSize = textPaint.getTextSize();
    // If there is a max text size set, use the lesser of that and the default text size
    float targetTextSize = mMaxTextSize > 0 ? Math.min(mTextSize, mMaxTextSize) : mTextSize;

    // Get the required text height
    int textHeight = getTextHeight(text, textPaint, width, targetTextSize);

    // Until we either fit within our text view or we had reached our min text size, incrementally try smaller sizes
    while (textHeight > height && targetTextSize > mMinTextSize) {
        targetTextSize = Math.max(targetTextSize - 2, mMinTextSize);
        textHeight = getTextHeight(text, textPaint, width, targetTextSize);
    }

    // If we had reached our minimum text size and still don't fit, append an ellipsis
    if (mAddEllipsis && targetTextSize == mMinTextSize && textHeight > height) {
        // Draw using a static layout
        // modified: use a copy of TextPaint for measuring
        TextPaint paint = new TextPaint(textPaint);
        // Draw using a static layout
        StaticLayout layout = new StaticLayout(text, paint, width, Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, false);
        // Check that we have a least one line of rendered text
        if (layout.getLineCount() > 0) {
            // Since the line at the specific vertical position would be cut off,
            // we must trim up to the previous line
            int lastLine = layout.getLineForVertical(height) - 1;
            // If the text would not even fit on a single line, clear it
            if (lastLine < 0) {
                setText("");
            }
            // Otherwise, trim to the previous line and add an ellipsis
            else {
                int start = layout.getLineStart(lastLine);
                int end = layout.getLineEnd(lastLine);
                float lineWidth = layout.getLineWidth(lastLine);
                float ellipseWidth = textPaint.measureText(mEllipsis);

                // Trim characters off until we have enough room to draw the ellipsis
                while (width < lineWidth + ellipseWidth) {
                    lineWidth = textPaint.measureText(text.subSequence(start, --end + 1).toString());
                }
                setText(text.subSequence(0, end) + mEllipsis);
            }
        }
    }

    // Some devices try to auto adjust line spacing, so force default line spacing
    // and invalidate the layout as a side effect
    setTextSize(TypedValue.COMPLEX_UNIT_PX, targetTextSize);
    setLineSpacing(mSpacingAdd, mSpacingMult);

    // Notify the listener if registered
    if (mTextResizeListener != null) {
        mTextResizeListener.onTextResize(this, oldTextSize, targetTextSize);
    }

    // Reset force resize flag
    mNeedsResize = false;
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
/**
 * Re-sizes the textSize of the TextView so that the text fits within the bounds of the View.
 */
private static void autofit(TextView view, TextPaint paint, float minTextSize, float maxTextSize,
                            int maxLines, float precision) {
    if (maxLines <= 0 || maxLines == Integer.MAX_VALUE) {
        // Don't auto-size since there's no limit on lines.
        return;
    }

    int targetWidth = view.getWidth() - view.getPaddingLeft() - view.getPaddingRight();
    if (targetWidth <= 0) {
        return;
    }

    CharSequence text = view.getText();
    TransformationMethod method = view.getTransformationMethod();
    if (method != null) {
        text = method.getTransformation(text, view);
    }

    Context context = view.getContext();
    Resources r = Resources.getSystem();
    DisplayMetrics displayMetrics;

    float size = maxTextSize;
    float high = size;
    float low = 0;

    if (context != null) {
        r = context.getResources();
    }
    displayMetrics = r.getDisplayMetrics();

    paint.set(view.getPaint());
    paint.setTextSize(size);

    if ((maxLines == 1 && paint.measureText(text, 0, text.length()) > targetWidth)
            || getLineCount(text, paint, size, targetWidth, displayMetrics) > maxLines) {
        size = getAutofitTextSize(text, paint, targetWidth, maxLines, low, high, precision,
                displayMetrics);
    }

    if (size < minTextSize) {
        size = minTextSize;
    }

    view.setTextSize(TypedValue.COMPLEX_UNIT_PX, size);
}
 

import android.text.TextPaint; //導入方法依賴的package包/類
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    protected void onDraw(Canvas canvas) {
        if (!mIsVerticalMode) {
            super.onDraw(canvas);
        } else {
            if (mLineCount == 0) {
                return;
            }

            final TextPaint paint = getPaint();
            paint.setColor(getCurrentTextColor());
            paint.drawableState = getDrawableState();
            final Paint.FontMetricsInt fontMetricsInt = paint.getFontMetricsInt();
            final char[] chars = getText().toString().toCharArray();

            canvas.save();

            int curLine = 0;
            float curLineX = getWidth() - getPaddingRight() - mLineWidths[curLine];
            float curX = curLineX;
            float curY = getPaddingTop();
            for (int i = 0; i < chars.length; i++) {
                final char c = chars[i];
//            boolean needRotate = !Caches.isCJK(c);
                boolean needRotate = !isCJKCharacter(c);
                final int saveCount = canvas.save();
                if (needRotate) {
                    canvas.rotate(90, curX, curY);
                }
                // draw
                float textX = curX;
                float textBaseline = needRotate ?
                        curY - (mLineWidths[curLine] - (fontMetricsInt.bottom - fontMetricsInt.top)) / 2 - fontMetricsInt.descent :
                        curY - fontMetricsInt.ascent;
                canvas.drawText(chars, i, 1, textX, textBaseline, paint);
                canvas.restoreToCount(saveCount);

                // if break line
                boolean hasNextChar = i + 1 < chars.length;
                if (hasNextChar) {
//                boolean breakLine = needBreakLine(i, mLineCharsCount, curLine);
                    boolean nextCharBreakLine = i + 1 > mLineBreakIndex[curLine];
                    if (nextCharBreakLine && curLine + 1 < mLineWidths.length) {
                        // new line
                        curLine++;
                        curLineX -= (mLineWidths[curLine] * getLineSpacingMultiplier() + getLineSpacingExtra());
                        curX = curLineX;
                        curY = getPaddingTop();
                    } else {
                        // move to next char
                        if (needRotate) {
                            curY += paint.measureText(chars, i, 1);
                        } else {
                            curY += fontMetricsInt.descent - fontMetricsInt.ascent;
                        }
                    }
                }
            }

            canvas.restore();
        }
    }
 

import android.text.TextPaint; //導入方法依賴的package包/類
public MyTextView(final Context context, final AttributeSet attrs, final int defStyle) {
    super(context, attrs, defStyle);
    // using the minimal recommended font size
    _minTextSize = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, getResources().getDisplayMetrics());
    _maxTextSize = getTextSize();
    _paint = new TextPaint(getPaint());
    if (_maxLines == 0)
        // no value was assigned during construction
        _maxLines = NO_LINE_LIMIT;
    // prepare size tester:
    _sizeTester = new SizeTester() {
        final RectF textRect = new RectF();

        @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
        @Override
        public int onTestSize(final int suggestedSize, final RectF availableSpace) {
            _paint.setTextSize(suggestedSize);
            final TransformationMethod transformationMethod = getTransformationMethod();
            final String text;
            if (transformationMethod != null)
                text = transformationMethod.getTransformation(getText(), MyTextView.this).toString();
            else
                text = getText().toString();
            final boolean singleLine = getMaxLines() == 1;
            if (singleLine) {
                textRect.bottom = _paint.getFontSpacing();
                textRect.right = _paint.measureText(text);
            } else {
                final StaticLayout layout = new StaticLayout(text, _paint, _widthLimit, Layout.Alignment.ALIGN_NORMAL, _spacingMult, _spacingAdd, true);
                // return early if we have more lines
                if (getMaxLines() != NO_LINE_LIMIT && layout.getLineCount() > getMaxLines())
                    return 1;
                textRect.bottom = layout.getHeight();
                int maxWidth = -1;
                int lineCount = layout.getLineCount();
                for (int i = 0; i < lineCount; i++) {
                    int end = layout.getLineEnd(i);
                    if (i < lineCount - 1 && end > 0 && !isValidWordWrap(text.charAt(end - 1), text.charAt(end)))
                        return 1;
                    if (maxWidth < layout.getLineRight(i) - layout.getLineLeft(i))
                        maxWidth = (int) layout.getLineRight(i) - (int) layout.getLineLeft(i);
                }
                //for (int i = 0; i < layout.getLineCount(); i++)
                //    if (maxWidth < layout.getLineRight(i) - layout.getLineLeft(i))
                //        maxWidth = (int) layout.getLineRight(i) - (int) layout.getLineLeft(i);
                textRect.right = maxWidth;
            }
            textRect.offsetTo(0, 0);
            if (availableSpace.contains(textRect))
                // may be too small, don't worry we will find the best match
                return -1;
            // else, too big
            return 1;
        }
    };
    _initialized = true;
}