Android实现IM多人员组合的群组头像

说明：

此头像类似微信群组头像，整个头像由组内前n位人员的头像组合而成，可用网络或本地图片进行组合，最终显示为一个头像整体，看效果图：

一、自定义整体头像的viewgroup，计算并保存宽高(重写onmeasure)：

@override
 protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
  mwidth = getwidth(widthmeasurespec);
  mheight = getheight(heightmeasurespec);
  setmeasureddimension(mwidth, mheight);
 }
 
 private int getwidth(int measurespec) {
  int width = min_width_and_height;
  int specmode = measurespec.getmode(measurespec);
  int specsize = measurespec.getsize(measurespec);
  if (specmode == measurespec.exactly) {
   width = specsize;
  } else if (specmode == measurespec.at_most) {
   width = math.min(min_width_and_height, specsize);
  }
  return width;
 }
 
 private int getheight(int measurespec) {
  int height = min_width_and_height;
  int specmode = measurespec.getmode(measurespec);
  int specsize = measurespec.getsize(measurespec);
  if (specmode == measurespec.exactly) {
   height = specsize;
  } else if (specmode == measurespec.at_most) {
   height = math.min(min_width_and_height, specsize);
  }
  return height;
 }

二、布局子头像的view(重写onlayout，对每个子头像进行布局)：

@override
 protected void onlayout(boolean changed, int l, int t, int r, int b) {
  layoutchild();
 }
 
 private void layoutchild() {
  if (mimgurls == null || mimgurls.isempty()) {
   return;
  }
  for (int i = 0; i < mimgsize; i++) {
   imageview itemv = (imageview) getchildat(i);
   int left = 0, top = 0, right = 0, bottom = 0;
   /*
   对每个item的view计算left、top、right、bottom四个值
    */
   ...
   itemv.layout(left, top, right, bottom); //真正布局子头像位置
   showimage(itemv, mimgurls.get(i)); //加载并显示子头像图片
  }
 }

三、加载并显示各子头像(使用glide加载并显示每个子头像)

private void showimage(context context, imageview iv, string url) {
  if (textutils.isempty(url)) {
   bitmap bmp = bitmapfactory.decoderesource(context.getresources(), r.mipmap.user_default_icon);
   iv.setimagebitmap(bmp);
   return;
  }
  glide.with(context).load(url)
    .diskcachestrategy(diskcachestrategy.all)
    .dontanimate()
    .placeholder(r.mipmap.user_default_icon)
    .error(r.mipmap.user_default_icon)
    .into(iv);
 }

到此多图片组合头像已经完成，不过想要圈形的还需要进行以下步奏

四、裁剪整个群头像为圆形(重写dispatchdraw)：

@override
 protected void dispatchdraw(canvas canvas) {
  path path = new path();
  path.addcircle(mwidth / 2, mheight / 2, mwidth / 2, path.direction.cw);
  canvas.clippath(path);
  canvas.drawcolor(color.transparent);
  super.dispatchdraw(canvas);
  drawgroupview(canvas);
 }
 
 /**
  * 绘制各头像间隔线
  * @param canvas
  */
 private void drawgroupview(canvas canvas) {
  /*
  计算各条线的x和y坐标值
   */
  float[] point1 = new float[2], point2 = new float[2];
  ...
  drawline(canvas, point1, point2);
 }
 
 /**
  * 绘制直线
  */
 private void drawline(canvas canvas, float[] point1, float[] point2) {
  mpaint.reset();
  mpaint.setantialias(true);
  mpaint.setstrokewidth(minterval);
  mpaint.setcolor(color.white);
  mpaint.setstyle(paint.style.stroke);
  canvas.drawline(point1[0], point1[1], point2[0], point2[1], mpaint);
 }

五、暴露公共方法供外部调用：

/**
  * 设置图片url集合
  *
  * @param imgs 图片url集合
  */
 public void setimages(list<string> imgs) {
  if (imgs == null || imgs.isempty()) {
   return;
  }
  if (imgs.size() > max_size) {
   imgs = imgs.sublist(0, max_size);
  }
  removeallviews();
  mimgurls = imgs;
  mimgsize = imgs.size();
  for (int i = 0; i < mimgsize; i++) {
   view v = getitemview(i);
   if (v == null) {
    return;
   }
   addview(v, generatedefaultlayoutparams());
  }
  requestlayout();
 }
 
 /**
  * 设置单个图片url
  *
  * @param img 图片url
  */
 public void setimageurl(string img) {
  arraylist imgurls = new arraylist<>();
  imgurls.add(img);
  setimages(imgurls);
 }
 
 /**
  * 生成一个头像布局
  */
 private imageview getitemview(int position) {
  ...
 }

六、使用：

1.写一个布局文件放自定义群组头像控件：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#f2f2f2"
    android:orientation="vertical">
 
 <com.yyh.im.ui.widget.headview
  android:id="@+id/cv_head"
  android:layout_width="150dp"
  android:layout_height="150dp"/>
 
</linearlayout>

2.代码中群组头像控件显示图片：

@bindview(r2.id.cv_head)
 public headview mheadcv;
 
 private string[] img_url_list = {
   "70cfv8sh_q1ynxgkpowk1hf6hhy/it/u=416954025,2289731303&fm=27&gp=0.jpg",
   "70cfuxsh_q1ynxgkpowk1hf6hhy/it/u=704997830,3098922597&fm=27&gp=0.jpg",
   "70cfvxsh_q1ynxgkpowk1hf6hhy/it/u=1375449509,557259337&fm=27&gp=0.jpg",
   "70cfvnsh_q1ynxgkpowk1hf6hhy/it/u=2825392570,1862752263&fm=27&gp=0.jpg",
   "70cfvxsh_q1ynxgkpowk1hf6hhy/it/u=3252489351,440833245&fm=27&gp=0.jpg",
   "70cfuhsh_q1ynxgkpowk1hf6hhy/it/u=3586311245,3082636880&fm=27&gp=0.jpg"
 };
 
 private void showimage(){
  arraylist<string> list = new arraylist<>();
  for (int i = 0; i < 6; i++) {
   list.add(img_url_list[i]);
  }
  mheadcv.setimageurls(list);
 }

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。