Android实现简单下拉筛选框

最近接到一个新的项目，项目时间比较紧张，有一个功能类似于58同城,京东的一个下拉筛选框，为了节省时间，从网上面拷贝了一份封装好的代码，进行的自己的一些修改，感觉灵活性还挺高的，分享出来给大家看一看

大致效果如下，可以自己加入自己的布局

先看一下这个expandtabview这个类  代码比较简单 我就不做具体介绍了 有不懂的可以私信我

public class expandtabview extends linearlayout implements ondismisslistener {
 
 private togglebutton selectedbutton;
 private arraylist<string> mtextarray = new arraylist<string>();
 private arraylist<relativelayout> mviewarray = new arraylist<relativelayout>();
 private arraylist<togglebutton> mtogglebutton = new arraylist<togglebutton>();
 private context mcontext;
 private final int small = 0;
 private int displaywidth;
 private int displayheight;
 private popupwindow popupwindow;
 private int selectposition;
 
 public expandtabview(context context) {
 super(context);
 init(context);
 }
 
 public expandtabview(context context, attributeset attrs) {
 super(context, attrs);
 init(context);
 }
 
 /**
 * 根据选择的位置设置tabitem显示的值
 */
 public void settitle(string valuetext, int position) {
 if (position < mtogglebutton.size()) {
 mtogglebutton.get(position).settext(valuetext);
 }
 }
 
 public void settitle(string title){
 
 }
 /**
 * 根据选择的位置获取tabitem显示的值
 */
 public string gettitle(int position) {
 if (position < mtogglebutton.size() && mtogglebutton.get(position).gettext() != null) {
 return mtogglebutton.get(position).gettext().tostring();
 }
 return "";
 }
 
 /**
 * 设置tabitem的个数和初始值
 */
 public void setvalue(arraylist<string> textarray, arraylist<view> viewarray) {
 if (mcontext == null) {
 return;
 }
 layoutinflater inflater = (layoutinflater) mcontext.getsystemservice(context.layout_inflater_service);
 
 mtextarray = textarray;
 for (int i = 0; i < viewarray.size(); i++) {
 final relativelayout r = new relativelayout(mcontext);
 int maxheight = (int) (displayheight * 0.7);
 relativelayout.layoutparams rl = new relativelayout.layoutparams(relativelayout.layoutparams.fill_parent, maxheight);
 rl.leftmargin = 10;
 rl.rightmargin = 10;
 r.addview(viewarray.get(i), rl);
 mviewarray.add(r);
 r.settag(small);
 togglebutton tbutton = (togglebutton) inflater.inflate(r.layout.toggle_button, this, false);
 addview(tbutton);
 view line = new textview(mcontext);
 line.setbackgroundresource(r.drawable.choosebar_line);
 if (i < viewarray.size() - 1) {
 layoutparams lp = new layoutparams(2, layoutparams.fill_parent);
 addview(line, lp);
 }
 mtogglebutton.add(tbutton);
 tbutton.settag(i);
 tbutton.settext(mtextarray.get(i));
 
 r.setonclicklistener(new onclicklistener() {
 @override
 public void onclick(view v) {
  onpressback();
 }
 });
 
 r.setbackgroundcolor(mcontext.getresources().getcolor(r.color.popup_main_background));
 tbutton.setonclicklistener(new onclicklistener() {
 @override
 public void onclick(view view) {
  // initpopupwindow();
  togglebutton tbutton = (togglebutton) view;
 
  if (selectedbutton != null && selectedbutton != tbutton) {
  selectedbutton.setchecked(false);
  }
  selectedbutton = tbutton;
  selectposition = (integer) selectedbutton.gettag();
  startanimation();
  if (monbuttonclicklistener != null && tbutton.ischecked()) {
  monbuttonclicklistener.onclick(selectposition);
  }
 }
 });
 }
 }
 
 private void startanimation() {
 
 if (popupwindow == null) {
 popupwindow = new popupwindow(mviewarray.get(selectposition), displaywidth, displayheight);
 popupwindow.setanimationstyle(r.style.popupwindowanimation);
 
 popupwindow.setfocusable(false);
 popupwindow.setoutsidetouchable(true);
 }
 
 if (selectedbutton.ischecked()) {
 if (!popupwindow.isshowing()) {
 showpopup(selectposition);
 } else {
 popupwindow.setondismisslistener(this);
 popupwindow.dismiss();
 hideview();
 }
 } else {
 if (popupwindow.isshowing()) {
 popupwindow.dismiss();
 hideview();
 }
 }
 }
 
 private void showpopup(int position) {
 view tview = mviewarray.get(selectposition).getchildat(0);
 if (tview instanceof viewbaseaction) {
 viewbaseaction f = (viewbaseaction) tview;
 f.show();
 }
 if (popupwindow.getcontentview() != mviewarray.get(position)) {
 popupwindow.setcontentview(mviewarray.get(position));
 }
 popupwindow.showasdropdown(this, 0, 0);
 }
 
 /**
 * 如果菜单成展开状态，则让菜单收回去
 */
 public boolean onpressback() {
 if (popupwindow != null && popupwindow.isshowing()) {
 popupwindow.dismiss();
 hideview();
 if (selectedbutton != null) {
 selectedbutton.setchecked(false);
 }
 return true;
 } else {
 return false;
 }
 
 }
 
 private void hideview() {
 view tview = mviewarray.get(selectposition).getchildat(0);
 if (tview instanceof viewbaseaction) {
 viewbaseaction f = (viewbaseaction) tview;
 f.hide();
 }
 }
 
 private void init(context context) {
 mcontext = context;
 displaywidth = ((activity) mcontext).getwindowmanager().getdefaultdisplay().getwidth();
 displayheight = ((activity) mcontext).getwindowmanager().getdefaultdisplay().getheight();
 setorientation(linearlayout.horizontal);
 }
 
 @override
 public void ondismiss() {
 showpopup(selectposition);
 popupwindow.setondismisslistener(null);
 }
 
 private onbuttonclicklistener monbuttonclicklistener;
 
 /**
 * 设置tabitem的点击监听事件
 */
 public void setonbuttonclicklistener(onbuttonclicklistener l) {
 monbuttonclicklistener = l;
 }
 
 /**
 * 自定义tabitem点击回调接口
 */
 public interface onbuttonclicklistener {
 public void onclick(int selectposition);
 }
 
}

这个代码基本就是对popupwindow进行了封装，通过对togglebutton按钮的监听来实现popupwindow的弹出和收回。

外部设置的话，也特别简单，只需要将自己定义好的布局传入到list集合中就可以。

下面是mainactivity中的代码

public class mainactivity extends appcompatactivity {
 
 
 private expandtabview expandtabview;
 private arraylist<view> mviewarray = new arraylist<view>();
 private viewleft viewleft;
 private viewmiddle viewmiddle;
 private viewright viewright;
 
 @override
 protected void oncreate(bundle savedinstancestate) {
 
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_main);
  initview();
  initvaule();
  initlistener();
 
 }
 
 private void initview() {
 
  expandtabview = (expandtabview) findviewbyid(r.id.expandtab_view);
  viewleft = new viewleft(this);
  viewmiddle = new viewmiddle(this);
  viewright = new viewright(this);
 
 }
 
 private void initvaule() {
  mviewarray.add(viewmiddle);
 mviewarray.add(viewleft);
 mviewarray.add(viewright);
  arraylist<string> mtextarray = new arraylist<string>();
  mtextarray.add("区域");
 mtextarray.add("距离");
 mtextarray.add("距离");
 
  expandtabview.setvalue(mtextarray, mviewarray);
// expandtabview.settitle(viewleft.getshowtext(), 0);
// expandtabview.settitle(viewmiddle.getshowtext(), 1);
// expandtabview.settitle(viewright.getshowtext(), 2);
 
 }
 
 private void initlistener() {
 
  viewleft.setonselectlistener(new viewleft.onselectlistener() {
 
   @override
   public void getvalue(string distance, string showtext) {
    onrefresh(viewleft, showtext);
   }
  });
 
  viewmiddle.setonselectlistener(new viewmiddle.onselectlistener() {
 
   @override
   public void getvalue(string showtext) {
 
    onrefresh(viewmiddle,showtext);
 
   }
  });
 
  viewright.setonselectlistener(new viewright.onselectlistener() {
 
   @override
   public void getvalue(string distance, string showtext) {
    onrefresh(viewright, showtext);
   }
  });
 
 }
 
 private void onrefresh(view view, string showtext) {
 
  expandtabview.onpressback();
  int position = getpositon(view);
  if (position >= 0 && !expandtabview.gettitle(position).equals(showtext)) {
   expandtabview.settitle(showtext, position);
  }
//  toast.maketext(mainactivity.this, showtext, toast.length_short).show();
 
 }
 
 private int getpositon(view tview) {
  for (int i = 0; i < mviewarray.size(); i++) {
   if (mviewarray.get(i) == tview) {
    return i;
   }
  }
  return -1;
 }
 
 @override
 public void onbackpressed() {
 
  if (!expandtabview.onpressback()) {
   finish();
  }
 
 }
 
}

以上就是这个筛选菜单栏的大致用法，个人感觉还是比较简单的，也比较灵活,修改起来也比较方便。

但是在项目中使用的时候碰到了一个问题，就是popupwindow在7.0的手机上弹出位置异常的问题,，查了一下，是因为手机状态栏高度的问题

于是重写了一下popupwindow的showasdropdown方法就解决了，下面是具体代码

@override
 public void showasdropdown(view anchor, int xoff, int yoff) {
  if(build.version.sdk_int >= 24) {
   rect rect = new rect();
   anchor.getglobalvisiblerect(rect);
   int h = anchor.getresources().getdisplaymetrics().heightpixels - rect.bottom;
   setheight(h);
  }
  super.showasdropdown(anchor, xoff, yoff);
 }

通过对sdk版本来进行判断，大于24的话就执行这个方法，解决了popupwindow在7.0手机上异常弹出的问题。

最后附上demo地址 

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。