android自定义带箭头对话框

本文实例为大家分享了android自定义带箭头对话框的具体代码，供大家参考，具体内容如下

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.view.gravity;
 
import com.sankuai.shangou.stone.util.densityutil;
import com.sankuai.waimai.store.search.r;
 
/**
 * created by android studio. user: liangyongyao date: 2021/3/7 des: 带倒三角的气泡
 */
public class bubblearrowtextview extends android.support.v7.widget.appcompattextview {
 
 private final static int triangle_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 mstrokewidth;
 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 context,
  @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 (attrs != 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.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(r.styleable.bubblearrowtextview_trianglewidth, densityutil.dip2px(context, 3.5f));
  triangledirection = a.getint(r.styleable.bubblearrowtextview_triangledirection, 0);
  a.recycle();
 }
 
 setgravity(gravity.center);
 initpaint();
 }
 
 //初始化画笔
 public void initpaint() {
 mpaint = new paint();
 mpaint.setantialias(true);
 mpaint.setstyle(paint.style.fill);
 mpaint.settextsize(getpaint().gettextsize());
 mpaint.setdither(true);
 }
 
 //初始化边框线画笔
 public void initstrokepaint() {
 mstrokepaint = new paint();
 mstrokepaint.setantialias(true);
 mstrokepaint.setstyle(paint.style.fill);
 mstrokepaint.setdither(true);
 }
 
 @override
 protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
 super.onmeasure(widthmeasurespec, heightmeasurespec);
 mlabelheight = getfontheight() + getpaddingtop() + getpaddingbottom();
 mtotalheight = mlabelheight + mtriangleheight * 2 + mstrokewidth * 2;
 mtotalwidth = getpaddingleft() + getfontwidth() + getpaddingright() + mstrokewidth * 2;
 setmeasureddimension(mtotalwidth, mtotalheight);
 }
 @override
 protected void ondraw(canvas canvas) {
 drawview(canvas);
 super.ondraw(canvas);
 }
 
 //绘制气泡
 private void drawview(canvas canvas) {
 if (mstrokecolor != 0 && mstrokewidth != 0) {
  initstrokepaint();
  mstrokepaint.setcolor(mstrokecolor);
  drawround(canvas, mstrokepaint, 0);
  drawtriangle(canvas, mstrokepaint, 0);
 }
 if (mbgcolor != 0) {
  mpaint.setcolor(mbgcolor);
  drawround(canvas, mpaint, mstrokewidth);
  drawtriangle(canvas, mpaint, mstrokewidth);
 }
 }
 
 //绘制矩形
 private void drawround(canvas canvas, paint paint, int strokewidth) {
 canvas.drawroundrect(strokewidth, mtriangleheight + strokewidth,
  mtotalwidth - strokewidth, mtotalheight - mtriangleheight - strokewidth,
  mradius, mradius, paint);
 }
 
 //绘制三角形
 private void drawtriangle(canvas canvas, paint paint, int strokewidth) {
 path path = new path();
 switch (triangledirection) {
  //上
  case triangle_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;
  //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);
 }
 
 //根据字号求字体高度
 private int getfontheight() {
 paint.fontmetrics fontmetrics = mpaint.getfontmetrics();
 return math.round(fontmetrics.descent - fontmetrics.ascent);
 }
 
 //根据字号求字体宽度
 private int getfontwidth() {
 return (int) mpaint.measuretext(gettext().tostring());
 }
} 

xml：

<declare-styleable name="bubblearrowtextview">
  <attr name="bubblecolor" format="reference|color" />
  <attr name="bubblestrokecolor" format="reference|color" />
  <attr name="bubblestrokewidth" format="dimension" />
  <attr name="triangleheight" format="dimension" />
  <attr name="trianglewidth" format="dimension" />
  <attr name="bubbleradius" format="dimension" />
  <attr name="triangledirection">
   <flag name="top" value="1" />
   <flag name="bottom" value="2" />
  </attr>
</declare-styleable>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。