我知道有很多相同类型的问题可供使用,我尝试了很多解决方案,但所有这些问题都达不到我的要求.
我的问题是我必须在包含Spanable字符串和Imagespan的文本之间添加动态行间距,但是当我添加行间距时,文本和图像的对齐会变形.
我已经尝试了Stackoverflow上几乎所有可用的解决方案,如this,this& this但是一切都在静脉中.
我附上了截图
>添加动态行间距之前的屏幕截图
2.添加动态行间距后的屏幕截图
任何帮助将受到高度赞赏.提前致谢！
解决方法:
在onDraw方法中使用“y”查找文本的基线,然后将drawable与文本视图的基线对齐
public class VerticalImageSpan extends ImageSpan {
public VerticalImageSpan(Drawable drawable) {
super(drawable);
}
/**
* update the text line height
*/
@Override
public int getSize(Paint paint, CharSequence text, int start, int end,
Paint.FontMetricsInt fontMetricsInt) {
Drawable drawable = getDrawable();
Rect rect = drawable.getBounds();
if (fontMetricsInt != null) {
Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
int fontHeight = fmPaint.descent - fmPaint.ascent;
int drHeight = rect.bottom - rect.top;
int centerY = fmPaint.ascent + fontHeight / 2;
fontMetricsInt.ascent = centerY - drHeight / 2;
fontMetricsInt.top = fontMetricsInt.ascent;
fontMetricsInt.bottom = centerY + drHeight / 2;
fontMetricsInt.descent = fontMetricsInt.bottom;
}
return rect.right;
}
/**
* see detail message in android.text.TextLine
*
* @param canvas the canvas, can be null if not rendering
* @param text the text to be draw
* @param start the text start position
* @param end the text end position
* @param x the edge of the replacement closest to the leading margin
* @param top the top of the line
* @param y the baseline
* @param bottom the bottom of the line
* @param paint the work paint
*/
@Override
public void draw(Canvas canvas, CharSequence text, int start, int end,
float x, int top, int y, int bottom, Paint paint) {
Drawable drawable = getDrawable();
canvas.save();
Paint.FontMetricsInt fmPaint = paint.getFontMetricsInt();
int fontHeight = fmPaint.descent - fmPaint.ascent;
int centerY = y + fmPaint.descent - fontHeight / 2;
int transY = centerY - (drawable.getBounds().bottom - drawable.getBounds().top) / 2;
canvas.translate(x, transY);
drawable.draw(canvas);
canvas.restore();
}
}
标签：android,android-layout
来源： https://codeday.me/bug/0701/1349634.html
