java - Blackberry ListField文本包装-仅两行

在我的ListField中，我希望能够采用任何给定的长字符串，并且只能够将第一行换行到屏幕的宽度内，并且只剩下其余的字符串并在下面显示并省略掉其余的字符串。现在，这就是我用来检测画图调用中包裹的方法：

int totalWidth = 0;
int charWidth = 0;
int lastIndex = 0;
int spaceIndex = 0;
int lineIndex = 0;
String firstLine = "";
String secondLine = "";
boolean isSecondLine = false;

for (int i = 0; i < longString.length(); i++){
  charWidth = Font.getDefault().getAdvance(String.valueOf(longString.charAt(i)));
  //System.out.println("char width: " + charWidth);
  if(longString.charAt(i) == ' ')
  spaceIndex = i;
  if((charWidth + totalWidth) > (this.getWidth()-32)){
            //g.drawText(longString.substring(lastIndex, spaceIndex), xpos, y +_padding, DrawStyle.LEFT, w - xpos);
            lineIndex++;
    System.out.println("current lines to draw: " + lineIndex);
    /*if (lineIndex = 2){
    int idx =  i;
    System.out.println("first line " + longString.substring(lastIndex, spaceIndex));
    System.out.println("second line " + longString.substring(spaceIndex+1, longString.length()));
  }*/
  //firstLine = longString.substring(lastIndex, spaceIndex);
  firstLine = longString.substring(0, spaceIndex);
  //System.out.println("first new line: " +firstLine);
  //isSecondLine=true;
  //xpos = 0;
  //y += Font.getDefault().getHeight();
  i = spaceIndex + 1;
  lastIndex = i;
  System.out.println("Rest of string: " + longString.substring(lastIndex, longString.length()));

  charWidth = 0;
  totalWidth = 0;
  }
  totalWidth += charWidth;
  System.out.println("total width: " + totalWidth);
  //g.drawText(longString.substring(lastIndex, i+1), xpos, y + (_padding*3)+4, DrawStyle.ELLIPSIS, w - xpos);

  //secondLine = longString.substring(lastIndex, i+1);
  secondLine = longString.substring(lastIndex, longString.length());
  //isSecondLine = true;
}

现在，这确实可以很好地包装任何给定的字符串（假设y值正确偏移，并​​且仅在字符串宽度超过屏幕宽度之后才绘制文本，然后再绘制其余的字符串），但是，每次尝试要获得前两行，如果它超出了两行，它总是最后返回字符串的后两行。既然我不了解新想法，是否有更好的方法来做这种事情？

最佳答案

我不确定我是否理解您的问题，但这听起来像是您需要一种自动换行算法，该算法在两行之后就放弃了。如果真是这样，那么这应该有望使您指明正确的方向。

void wrapString(String inputString, int width, Font font){
    String line1;
    String line2;

    if (font.getAdvance(inputString) <= width){
        line1 = inputString;
        line2 = "";
    }
    else{
        int charsInLine1 = countCharsInLine(inputString, 0, inputString.length()-1, width, font);
        int lineBreak = inputString.lastIndexOf(' ', charsInLine1);
        if (lineBreak == -1)
            lineBreak = charsInLine1;
        line1 = inputString.substring(0, lineBreak);

        line2 = inputString.substring(lineBreak+1, inputString.length());
        if (font.getAdvance(line2) > width){
            int charsInLine2 = countCharsInLine(line2, 0, inputString.length()-1, width - font.getAdvance("..."), font);
            line2 = line2.substring(0, charsInLine2) + "...";
        }
    }

    System.out.println("line1: " + line1);
    System.out.println("line2: " + line2);
}

int countCharsInLine(String str, int min, int max, int width, Font font) {

    if (min >= max)
        return max;

    int guess = min + (max - min) / 2;
    int advance = font.getAdvance(str, 0, guess);

    if (advance < width)
        return countCharsInLine(str, guess+1, max, width, font);
    else if (advance > width)
        return countCharsInLine(str, min, guess-1, width, font);
    else
        return guess;
}

关于java - Blackberry ListField文本包装-仅两行，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/2187245/