Java StaticLayout.getDesiredWidth方法代碼示例

import android.text.StaticLayout; //導入方法依賴的package包/類
private void drawUnitText(Canvas c) {
    if (null != mUnitText && !TextUtils.isEmpty(mUnitText)) {
        mUnitTextPaint.setColor(mUnitColor);
        mUnitTextPaint.setTextSize(mUnitSize);
        float startX = getWidth() - getPaddingRight() - StaticLayout.getDesiredWidth(mUnitText, 0, mUnitText.length(), mUnitTextPaint);
        Paint.FontMetrics fontMetrics = mUnitTextPaint.getFontMetrics();
        float startY = getVerticalSpace() / 2 + mUnitSize / 2 - fontMetrics.descent / 2;
        c.drawText(mUnitText, startX, startY, mUnitTextPaint);
    }
}
 

import android.text.StaticLayout; //導入方法依賴的package包/類
@Override
    public boolean drawChild(Canvas canvas, View child, long drawingTime) {
        // rotateX
        int centerY = getVerticalSpace() / 2;
        int childCenterY = child.getTop() + child.getHeight() / 2;
        float factor = (centerY - childCenterY) * 1f / centerY;
        float alphaFactor = 1 - 0.7f * Math.abs(factor);
        child.setAlpha(alphaFactor * alphaFactor * alphaFactor);
        float scaleFactor = 1 - 0.3f * Math.abs(factor);
        child.setScaleX(scaleFactor);
        child.setScaleY(scaleFactor);

        float rotateRadius = 2.0f * centerY / (float) Math.PI;
        float rad = (centerY - childCenterY) * 1f / rotateRadius;
        float offsetZ = rotateRadius * (1 - (float) Math.cos(rad));
        float rotateDeg = rad * 180 / (float) Math.PI;
        ViewCompat.setZ(child, -offsetZ);
        child.setRotationX(rotateDeg);

        float offsetY = centerY - childCenterY - rotateRadius * (float) Math.sin(rad) * 1.3f;
        child.setTranslationY(offsetY);

        // resize the text size if text can not be shown completely
        if (child instanceof TextView) {
            String data = ((TextView) child).getText().toString();
            if (((TextView) child).getTextSize() == mTextSize) {
                float finalTextSize = mTextSize;
                float dataStringW = StaticLayout.getDesiredWidth(data, 0, data.length(), ((TextView) child).getPaint());
                if (getHorizontalSpace() > 0 && dataStringW * 1.1f > getHorizontalSpace()) {
                    finalTextSize = getHorizontalSpace() / dataStringW / 1.1f * mTextSize;
                }
                ((TextView) child).setTextSize(TypedValue.COMPLEX_UNIT_PX, finalTextSize);
            }
        }

        return super.drawChild(canvas, child, drawingTime);

//        // parent centerY ,item centerY
//        int centerY = (getHeight() - getPaddingTop() - getPaddingBottom()) / 2;
//        int childCenterY = child.getTop() + child.getHeight() / 2;
//        // alpha
//        float factor = (centerY - childCenterY) * 1f / centerY;
//        float currentFactor = 1 - 0.7f * Math.abs(factor);
//        child.setAlpha(currentFactor * currentFactor * currentFactor);
//
//        // rotate radius
//        float rotateRadius = 2.5f * centerY / (float) Math.PI;
//        // deg
//        float rad = (centerY - childCenterY) * 1f / rotateRadius;
//        float rotateDeg = rad * 180 / (float) Math.PI;
//        // for camera
//        float offsetZ = rotateRadius * (1 - (float) Math.cos(rad));
//        canvas.save();
//        // offset Y for item rotate
//        float offsetY = centerY - childCenterY - rotateRadius * (float) Math.sin(rad);
//        canvas.translate(0, offsetY);
//        mCamera.save();
//        mCamera.translate(0, 0, offsetZ);
//        mCamera.rotateX(rotateDeg);
//        mCamera.getMatrix(mMatrix);
//        mCamera.restore();
//        mMatrix.preTranslate(-child.getWidth() / 2, -childCenterY);
//        mMatrix.postTranslate(child.getWidth() / 2, childCenterY);
//        canvas.concat(mMatrix);
//        super.drawChild(canvas, child, drawingTime);
//        canvas.restore();
//        return true;
    }
 

import android.text.StaticLayout; //導入方法依賴的package包/類
private void drawScaledText(final String line, final Canvas canvas, final float y, final float desiredLineWidth, final TextPaint paint) {
    String[] words = line.split(" ");

    float lineWidthWithoutSpaces = StaticLayout.getDesiredWidth(line.replace(" ", ""), getPaint());
    float spacing = (desiredLineWidth - lineWidthWithoutSpaces) / (words.length - 1);

    float x = 0;
    for (String word : words) {
        float cw = StaticLayout.getDesiredWidth(word, paint);
        canvas.drawText(word, x, y, paint);
        x += cw + spacing;
    }
}
 

import android.text.StaticLayout; //導入方法依賴的package包/類
/**
 * 重繪文字，兩端對齊
 *
 * @param canvas
 */
private void drawTextWithJustify(Canvas canvas) {
    // 文字畫筆
    TextPaint textPaint = getPaint();
    textPaint.setColor(getCurrentTextColor());
    textPaint.drawableState = getDrawableState();

    String text_str = getText().toString();
    // 當前所在行的Y向偏移
    int currentLineOffsetY = getPaddingTop();
    currentLineOffsetY += getTextSize();

    Layout layout = getLayout();

    //循環每一行,繪製文字
    for (int i = 0; i < layout.getLineCount(); i++) {
        int lineStart = layout.getLineStart(i);
        int lineEnd = layout.getLineEnd(i);
        //獲取到TextView每行中的內容
        String line_str = text_str.substring(lineStart, lineEnd);
        // 獲取每行字符串的寬度(不包括字符間距)
        float desiredWidth = StaticLayout.getDesiredWidth(text_str, lineStart, lineEnd, getPaint());

        if (isLineNeedJustify(line_str)) {
            //最後一行不需要重繪
            if (i == layout.getLineCount() - 1) {
                canvas.drawText(line_str, getPaddingLeft(), currentLineOffsetY, textPaint);
            } else {
                drawJustifyTextForLine(canvas, line_str, desiredWidth, currentLineOffsetY);
            }
        } else {
            canvas.drawText(line_str, getPaddingLeft(), currentLineOffsetY, textPaint);
        }
        //更新行Y向偏移
        currentLineOffsetY += getLineHeight();
    }
}
 

import android.text.StaticLayout; //導入方法依賴的package包/類
/**
 * 計算字符距離控件左側的位移
 *
 * @param line       字符所在行
 * @param charOffset 字符偏移量
 */
private float calculatorCharPositionToLeft(int line, int charOffset) {

    String text_str = getText().toString();


    Layout layout = getLayout();
    int lineStart = layout.getLineStart(line);
    int lineEnd = layout.getLineEnd(line);

    String line_str = text_str.substring(lineStart, lineEnd);

    if (line_str.equals("\n"))
        return getPaddingLeft();
    // 最左側
    if (lineStart == charOffset)
        return getPaddingLeft();
    // 最右側
    if (charOffset == lineEnd - 1)
        return mViewTextWidth + getPaddingLeft();

    float desiredWidth = StaticLayout.getDesiredWidth(text_str, lineStart, lineEnd, getPaint());

    // 中間位置
    // 計算相鄰字符之間需要填充的寬度
    // (TextView內容的實際寬度 - 該行字符串的寬度)/（字符個數-1）
    float insert_blank = (mViewTextWidth - desiredWidth) / (line_str.length() - 1);
    // 計算當前字符左側所有字符的寬度
    float allLeftCharWidth = StaticLayout.getDesiredWidth(text_str.substring(lineStart, charOffset), getPaint());

    // 相鄰字符之間需要填充的寬度 + 當前字符左側所有字符的寬度
    return insert_blank * (charOffset - lineStart) + allLeftCharWidth + getPaddingLeft();

}