处理固定宽度下的长字符串绘制(Android)

        在项目中尝试用surfaceview自绘UI来提高用户滑动体验，其中要在特定区域中绘制Text，而且要求固定长度，这就需要自己计算Text所占的宽度，并进行处理。

 

最终效果：

 

float text_size = 25.0f;
	public void drawBooks() {
		Canvas canvas = new Canvas(bmp_shelf);
		
		int i=0;
		float row_average = d.screen_width/4.0f;
		int offset_x = (int)((row_average - bmp_book.getWidth())/2.0f);
		int offset_y = rowheight - bmp_book.getHeight() - 20;
		int title_offset_y = (int)(90.0f*dpi/240.0f);
		
		TextPaint textPaint = new TextPaint();
		textPaint.setARGB(0xff, 255, 255, 255);
		textPaint.setTextSize(text_size);
		textPaint.setTextAlign(Align.RIGHT);
		textPaint.setAntiAlias(true);
		
		for(Iterator<BookData> itr=d.list_book.iterator();itr.hasNext();) {
			BookData bd = itr.next();
			int r = i/4;
			int book_x = (int)((i%4)*(row_average)+offset_x);
			int book_y = r*rowheight+offset_y;
			
			canvas.drawBitmap(bmp_book, book_x, book_y, null);
			
			String title = measureTitle(bd.title);
			StaticLayout layout = new StaticLayout(title, textPaint, 240, Alignment.ALIGN_NORMAL, 1.0F, 0.0F, true);
			canvas.translate(book_x+bmp_book.getWidth(), book_y+title_offset_y);
			layout.draw(canvas);
			canvas.translate(-book_x-bmp_book.getWidth(), -book_y-title_offset_y);
			
			i++;
		}
	}
	
	public String measureTitle(String title) {
		TextPaint textPaint = new TextPaint();
		textPaint.setTextSize(text_size);
		
		if(textPaint.measureText(title, 0, title.length())<bmp_book.getWidth()) 
			return title;
		
		int i; String str=null;
		for(i=title.length();i>0;i--) {
			str = title.substring(0, i) + "...";
			float width = textPaint.measureText(str);
			if(width<bmp_book.getWidth()) {
				break;
			}
		}
		
		return str;
	}

        其中关键代码在measureTitle上。