貌似现在写的文章都是从业务方面或者是实现某些功能方面来写的。呃。。。
慢慢来吧，主要还是为了方便记录自己碰到问题。如果以后有机会了也开始写一些有深度的文章吧！
现在的道行还是不够深，源码虽然看过一些，但是深入的研究的还是有点少。算了还是先记录今天的问题吧！
今天记录的问题应该是大多数的开发经常碰得到的问题，在大多数的情况下是不需要考虑对齐问题的。
先上图
中文不对齐.png
英文不对齐.png
中英文状态下因为标点符号造成最后右侧不对齐，尤其是英文状态下单词在一行盛不下，造成空的更大。为了解决这一个问题，我们就需要自定义TextView了。当时代码已经有写久远了，代码出处已经无法考证。还是上代码吧！
public class TextAlignTextView extends TextView {
private int mLineY;
private int mViewWidth;
public static final String TWO_CHINESE_BLANK = " ";
public TextAlignTextView (Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right,
int bottom) {
super.onLayout(changed, left, top, right, bottom);
}
@Override
protected void onDraw(Canvas canvas) {
TextPaint paint = getPaint();
paint.setColor(getCurrentTextColor());
paint.drawableState = getDrawableState();
mViewWidth = getMeasuredWidth();
String text = getText().toString();
mLineY = 0;
mLineY += getTextSize();
Layout layout = getLayout();
// layout.getLayout()在4.4.3出现NullPointerException
if (layout == null) {
return;
}
Paint.FontMetrics fm = paint.getFontMetrics();
int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));
textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout
.getSpacingAdd());
//解决了最后一行文字间距过大的问题
for (int i = 0; i < layout.getLineCount(); i++) {
int lineStart = layout.getLineStart(i);
int lineEnd = layout.getLineEnd(i);
float width = StaticLayout.getDesiredWidth(text, lineStart,
lineEnd, getPaint());
String line = text.substring(lineStart, lineEnd);
if(i < layout.getLineCount() - 1) {
if (needScale(line)) {
drawScaledText(canvas, lineStart, line, width);
} else {
canvas.drawText(line, 0, mLineY, paint);
}
} else {
canvas.drawText(line, 0, mLineY, paint);
}
mLineY += textHeight;
}
}
private void drawScaledText(Canvas canvas, int lineStart, String line,
float lineWidth) {
float x = 0;
if (isFirstLineOfParagraph(lineStart, line)) {
String blanks = " ";
canvas.drawText(blanks, x, mLineY, getPaint());
float bw = StaticLayout.getDesiredWidth(blanks, getPaint());
x += bw;
line = line.substring(3);
}
int gapCount = line.length() - 1;
int i = 0;
if (line.length() > 2 && line.charAt(0) == 12288
&& line.charAt(1) == 12288) {
String substring = line.substring(0, 2);
float cw = StaticLayout.getDesiredWidth(substring, getPaint());
canvas.drawText(substring, x, mLineY, getPaint());
x += cw;
i += 2;
}
float d = (mViewWidth - lineWidth) / gapCount;
for (; i < line.length(); i++) {
String c = String.valueOf(line.charAt(i));
float cw = StaticLayout.getDesiredWidth(c, getPaint());
canvas.drawText(c, x, mLineY, getPaint());
x += cw + d;
}
}
private boolean isFirstLineOfParagraph(int lineStart, String line) {
return line.length() > 3 && line.charAt(0) == ' '
&& line.charAt(1) == ' ';
}
private boolean needScale(String line) {
if (line == null || line.length() == 0) {
return false;
} else {
return line.charAt(line.length() - 1) != '\n';
}
}
}
实际上就是通过动态改变每一行文字的宽度来达到我们想要的效果。
实际效果图
中文对齐.png
英文对齐.png
最终的效果就是看到两端对齐，而不是原来的参差不齐。
好了，这一块的记录就到这了，希望对您有所帮助！！！
