Android实现多级列表中的新建功能

本文实例为大家分享了android实现多级列表中的新建功能，供大家参考，具体内容如下

多级列表的页面实现比较简单，所以把新建的功能拿出来了。

窗口代码

/**
 * 新建一个第一级列表的条目
 * 1.选择图片和附件都用intent.action_get_content实现
 * 2.打开文件用intent.action_view实现
 * 3.回传的uri需要转化成真实路径
 * 4.提交数据之后需要刷新列表
 */

public class sectionnewactivity extends appcompatactivity implements view.onclicklistener {
 private static final string tag = "sectionnewactivity";
 @bindview(r.id.tv_title_middle)
 textview title;
 @bindview(r.id.title_left)
 imageview back;
 @bindview(r.id.edit_tv)
 textview edit;
 @bindview(r.id.filter_tv)
 textview filter;
 @bindview(r.id.section_new_logo)
 imageview sectionlogo;
 @bindview(r.id.section_new_manager)
 textview sectionmanager;
 @bindview(r.id.section_new_title)
 textview sectiontitle;
 @bindview(r.id.section_new_desc)
 textview sectiondesc;
 @bindview(r.id.tv_upload_attach)
 textview selectattach;
 @bindview(r.id.lv_attach)
 listview mlistview;

 private context mcontext;
 private list<clsattachment> mattachlist;
 private attachmentlistadapter madapter;

 @override
 protected void oncreate(@nullable bundle savedinstancestate) {
  super.oncreate(savedinstancestate);
  setcontentview(r.layout.activity_section_new);
  butterknife.bind(this);

  initview();
  initdata();
  initlistener();
 }

 private void initdata() {
  mcontext = this;

  //初始化数据源
  mattachlist = new arraylist<>();
  madapter = new attachmentlistadapter(mattachlist, mcontext);
  mlistview.setadapter(madapter);
 }

 private void initview() {
  title.settext("新建板块");

  edit.setvisibility(view.visible);
  edit.setcompounddrawableswithintrinsicbounds(r.drawable.ic_send_black_24dp, 0, 0, 0);
 }

 private void initlistener() {

  back.setonclicklistener(this);
  edit.setonclicklistener(this);
  filter.setonclicklistener(this);
  sectionlogo.setonclicklistener(this);
  sectionmanager.setonclicklistener(this);
  selectattach.setonclicklistener(this);

  //点击附件列表条目的删除按钮，删除对应附件
  madapter.setmcallback((view, position) -> {
   mattachlist.remove(position);
   madapter.notifydatasetchanged();
  });


  //点击附件列表弹出打开方式
  mlistview.setonitemclicklistener((parent, view, position, id) -> {

   clsattachment clsattachment = mattachlist.get(position);
   intent intent = new intent();
   intent.addflags(intent.flag_activity_new_task);
   intent.setaction(intent.action_view);

   intent.setdataandtype(uri.parse(clsattachment.geturi()), "*/*");
   startactivity(intent);
  });
 }

 @override
 public void onclick(view v) {

  if (v.getid() == r.id.title_left) {
   finish();
  }
  if (v.getid() == r.id.edit_tv) {
   submit();
  }
  if (v.getid() == r.id.section_new_logo) {
   //打开手机原生的文件管理器，并且选取内容
   intent intent = new intent(intent.action_get_content);
   intent.addcategory(intent.category_openable);
   //文件类型为图片
   intent.settype("image/*");
   startactivityforresult(intent, 16352);
  }
  if (v.getid() == r.id.section_new_manager) {
   intent intent = new intent(mcontext, userselectactivity.class);
   startactivityforresult(intent, 12345);
  }

  if (v.getid() == r.id.tv_upload_attach) {

   //上传的附件数量不能超过4个
   if (mattachlist.size() < 4) {
    intent intent = new intent(intent.action_get_content);
    intent.addcategory(intent.category_openable);
    intent.settype("*/*");
    startactivityforresult(intent, 12367);

    if (mattachlist.size() == 0) {
     toast.maketext(mcontext, r.string.upload_warning, toast.length_long).show();
    }

   } else {
    toast.maketext(mcontext, "附件数量已达上限！", toast.length_short).show();
   }
  }
 }

 private void submit() {
  toast.maketext(mcontext, "在此处调用接口！", toast.length_short).show();
  finish();
 }

 @override
 //requestcode要对应上，resultcode都为默认值result_ok
 protected void onactivityresult(int requestcode, int resultcode, intent data) {

  //选择图片完成之后使用glide加载到控件上，此处有时需要把图片上传给后台
  //提交数据的时候传图片在后台的路径
  if (requestcode == 16352 && resultcode == result_ok) {
   glide.with(mcontext).load(data.getdata()).into(sectionlogo);
  }

  //打开选择用户的页面，根据传的参数不同页面也不同，默认是单选页面
  if (requestcode == 12345 && resultcode == result_ok) {
   clsnormaluser user = data.getparcelableextra("user");
   sectionmanager.settext(user.getcname());
  }

  //遍历已经上传的附件列表，如果已经存在就弹出提示
  if (requestcode == 12367 && resultcode == result_ok) {
   string uri = data.getdata().tostring();

   if (mattachlist.size() > 0) {
    for (int i = 0; i < mattachlist.size(); i++) {
     if (uri.equals(mattachlist.get(i).geturi())) {
      toast.maketext(mcontext, "请选择不同文件！", toast.length_short).show();
      break;
     }
     if (i == mattachlist.size() - 1) {
      addattach(data);
      break;
     }
    }
   } else {
    addattach(data);
   }
  }

  super.onactivityresult(requestcode, resultcode, data);
 }

 private void addattach(intent data) {
  //这里使用第三方库ucrop的getpath方法，也可以自己实现uri转换为path
  file file = new file(getpath(mcontext, data.getdata()));

  clsattachment clsattachment = new clsattachment();
  string name = file.getname();
  string type = name.split("\\.")[1];
  string size = file.length() + "";
  clsattachment.setsize(size);
  clsattachment.setfilename(name);
  clsattachment.seturi(data.getdata().tostring());

  //这里需要调用上传接口
  uploadfile(file.getpath());

  mattachlist.add(clsattachment);
  madapter.notifydatasetchanged();
 }

 private void uploadfile(string path) {
  toast.maketext(mcontext, "在此处调用接口！", toast.length_short).show();
 }
}

布局文件代码

<?xml version="1.0" encoding="utf-8"?>
<scrollview xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:background="@color/ghostwhite"
 android:layout_height="match_parent">

 <linearlayout
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical">

  <include layout="@layout/title_bar" />


  <imageview
   android:id="@+id/section_new_logo"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_gravity="center"
   android:scaletype="centercrop"
   android:background="@color/white"
   android:src="@drawable/logo" />

  <include layout="@layout/layout_item_divider_horizontal" />

  <edittext
   android:id="@+id/section_new_title"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_margin="10dp"
   android:background="@null"
   android:hint="请输入名称"
   android:inputtype="text"
   android:textcolor="@color/black" />

  <include layout="@layout/layout_item_divider_horizontal" />

  <edittext
   android:id="@+id/section_new_desc"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_margin="10dp"
   android:background="@null"
   android:gravity="top|start"
   android:hint="请输入内容"
   android:inputtype="textmultiline"
   android:minheight="100dp"
   android:textcolor="@color/black" />

  <include layout="@layout/layout_item_divider_horizontal" />

  <linearlayout
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_margin="10dp"
   android:orientation="horizontal">

   <textview
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="选择版主："
    android:textcolor="@color/black"
    android:textsize="18sp" />

   <textview
    android:id="@+id/section_new_manager"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:drawableend="@drawable/ic_arrow_drop_down_black_24dp"
    android:text="default user"
    android:textcolor="@color/black"
    android:textsize="18sp" />
  </linearlayout>

  <include layout="@layout/layout_item_divider_horizontal" />

  <linearlayout
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:gravity="center_vertical"
   android:background="@color/white"
   android:orientation="horizontal">

   <textview
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_marginstart="20dp"
    android:gravity="center_vertical"
    android:minheight="30dp"
    android:text="文件名："
    android:textcolor="@color/black" />

   <textview
    android:layout_width="100dp"
    android:layout_height="30dp"
    android:gravity="center_vertical"
    android:text="文件大小："
    android:textcolor="@color/black" />

   <textview
    android:layout_width="wrap_content"
    android:layout_height="30dp"
    android:gravity="center_vertical"
    android:text="操作："
    android:textcolor="@color/black" />

  </linearlayout>

  <listview
   android:id="@+id/lv_attach"
   android:layout_width="match_parent"
   android:layout_height="160dp"
   android:divider="@null" />

  <include layout="@layout/layout_item_divider_horizontal" />

  <textview
   android:id="@+id/tv_upload_attach"
   style="@style/widget.appcompat.button"
   android:layout_width="wrap_content"
   android:layout_height="40dp"
   android:layout_gravity="end"
   android:text="添加附件"
   android:textcolor="@color/black"
   android:textsize="16sp" />
 </linearlayout>
</scrollview>

适配器代码

public class attachmentlistadapter extends baseadapter {

 private list<clsattachment> mlist;
 private layoutinflater minflater;
 private callback mcallback;

 //自定义回调接口，用于传值
 public interface callback {

  void onclick(view view, int position);
 }

 public attachmentlistadapter(list<clsattachment> attachments, context mcontext) {
  this.mlist = attachments;
  minflater = layoutinflater.from(mcontext);
 }

 public void setmcallback(callback mcallback) {
  this.mcallback = mcallback;
 }

 @override
 public int getcount() {
  return mlist.size();
 }

 @override
 public clsattachment getitem(int position) {
  return mlist.get(position);
 }

 @override
 public long getitemid(int position) {
  return position;
 }

 @override
 public view getview(int position, view convertview, viewgroup parent) {

  clsattachment clsattachment = mlist.get(position);
  viewholder holder;

  if (convertview == null) {
   holder = new viewholder();
   convertview = minflater.inflate(r.layout.item_attchment_list, null);
   holder.delete = convertview.findviewbyid(r.id.attachment_delete);
   holder.name = convertview.findviewbyid(r.id.attachment_name);
   holder.size = convertview.findviewbyid(r.id.attachment_size);

   convertview.settag(holder);
  } else {
   holder = (viewholder) convertview.gettag();
  }

  holder.name.settext(clsattachment.getfilename());
  long length = long.parselong(clsattachment.getsize());
  holder.size.settext(length / 1024 + "kb");

  //将position放在tag里面
  holder.delete.settag(position);

  holder.delete.setonclicklistener(v -> {
   //触发点击事件的时候将position回传
   mcallback.onclick(v, (integer) v.gettag());
  });
  return convertview;
 }

 private class viewholder {

  textview name;
  textview size;
  textview delete;
 }
}

效果如图：

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。