android自定義帶箭頭對話框

1、本文實例為家了 android 自定義帶箭頭對話框的具體代碼，供家參考，具體內容如下import android.content.context; import android.content.res.typedarray; import android.graphics.canvas; import android.graphics.paint; import android.graphics.path; import android.support.annotation.nullable; import android.util.attributeset; import android.v

2、iew.gravity; import .sankuai.shangou.stone.util.densityutil; import .sankuai.waimai.store.search.r; /* * created by android studio. user: liangyongyao date: 2021/3/7 des: 帶倒三角的氣泡 */ public class bubblearrowtextview extends android.support.v7.widget.appcompattextview private final static int triangle

3、_direction_top = 1; private final static int triangle_direction_bottom = 2; private final static int triangle_direction_left = 1; private final static int triangle_direction_right = 2; private paint mpaint; private paint mstrokepaint; private int mbgcolor; private int mstrokecolor; private int mstro

4、kewidth; private int mtotalheight; private int mtotalwidth; private int mlabelheight; private int mtriangleheight; private int mtrianglewidth; private int mradius; private int triangledirection; public bubblearrowtextview(context context) this(context, null); public bubblearrowtextview(context conte

5、xt, nullable attributeset attrs) this(context, attrs, 0); public bubblearrowtextview(context context, nullable attributeset attrs, int defstyleattr) super(context, attrs, defstyleattr); init(context, attrs, defstyleattr); public void init(context context, attributeset attrs, int defstyleattr) if (at

6、trs != null) typedarray a = context.obtainstyledattributes(attrs, r.styleable.bubblearrowtextview); mbgcolor = a.getcolor(r.styleable.bubblearrowtextview_bubblecolor, 0); mstrokecolor = a.getcolor(r.styleable.bubblearrowtextview_bubblestrokecolor, 0); mradius = a.getdimensionpixeloffset(r.styleable.

7、bubblearrowtextview_bubbleradius, 0); mstrokewidth = a.getdimensionpixeloffset(r.styleable.bubblearrowtextview_bubblestrokewidth, 0); mtriangleheight = a.getdimensionpixeloffset(r.styleable.bubblearrowtextview_triangleheight, densityutil.dip2px(context, 6); mtrianglewidth = a.getdimensionpixeloffset

8、(r.styleable.bubblearrowtextview_trianglewidth, densityutil.dip2px(context, 3.5f); triangledirection = a.getint(r.styleable.bubblearrowtextview_triangledirection, 0); a.recycle(); setgravity(gravity.center); initpaint(); / 初始化畫筆 public void initpaint() mpaint = new paint(); mpaint.setantialias(true)

9、; mpaint.setstyle(paint.style.fill); mpaint.settextsize(getpaint().gettextsize(); mpaint.setdither(true); / 初始化邊框線畫筆 public void initstrokepaint() mstrokepaint = new paint(); mstrokepaint.setantialias(true); mstrokepaint.setstyle(paint.style.fill); mstrokepaint.setdither(true); override protected vo

10、id onmeasure(int widthmeasurespec, int heightmeasurespec) super.onmeasure(widthmeasurespec, heightmeasurespec); mlabelheight = getfontheight() + getpaingtop() + getpaingbottom(); mtotalheight = mlabelheight + mtriangleheight * 2 + mstrokewidth * 2; mtotalwidth = getpaingleft() + getfontwidth() + get

11、paingright() + mstrokewidth * 2; setmeasureddimension(mtotalwidth, mtotalheight); override protected void ondraw(canvas canvas) drawview(canvas); super.ondraw(canvas); / 繪制氣泡 private void drawview(canvas canvas) if (mstrokecolor != 0 & mstrokewidth != 0) initstrokepaint(); mstrokepaint.setcolor(

12、mstrokecolor); drawround(canvas, mstrokepaint, 0); drawtriangle(canvas, mstrokepaint, 0); if (mbgcolor != 0) mpaint.setcolor(mbgcolor); drawround(canvas, mpaint, mstrokewidth); drawtriangle(canvas, mpaint, mstrokewidth); / 繪制矩形 private void drawround(canvas canvas, paint paint, int strokewidth) canv

13、as.drawroundrect(strokewidth, mtriangleheight + strokewidth, mtotalwidth - strokewidth, mtotalheight - mtriangleheight - strokewidth, mradius, mradius, paint); / 繪制三角形 private void drawtriangle(canvas canvas, paint paint, int strokewidth) path path = new path(); switch (triangledirection) / 上 case t

14、riangle_direction_top: path.moveto(mtotalwidth * 0.8f - mtrianglewidth / 2 + strokewidth / 2, mtriangleheight + strokewidth); path.lineto(mtotalwidth * 0.8f, strokewidth + strokewidth / 2); path.lineto(mtotalwidth * 0.8f + mtrianglewidth / 2 - strokewidth / 2, mtriangleheight + strokewidth); break;

15、/ 下 case triangle_direction_bottom: path.moveto(mtotalwidth * 0.8f - mtrianglewidth/2 + strokewidth / 2, mtotalheight - mtriangleheight - strokewidth); path.lineto(mtotalwidth * 0.8f, mtotalheight - strokewidth - strokewidth / 2); path.lineto(mtotalwidth * 0.8f + mtrianglewidth/2 - strokewidth / 2, mtotalheight - mtriangleheight - strokewidth); break; default: return; canvas.drawpath(path, paint); / 根據字號求字體高度 private int getfontheight() pai