Android仿泡泡窗实现下拉菜单条实例代码

功能描述：点击下拉按钮，显示出所有的条目，有删除和点击功能，点击后将条目显示。

注意：泡泡窗默认是没有焦点的。要让泡泡窗获取到焦点。假如listview的item中有button，imagebutton,checkbox等会强制获取焦点的view 此时，listview的item无法获取焦点，从而无法被点击 解决方法：给item的根布局增加以下属性 android:descendantfocusability="blocksdescendants"设置之后，button获取焦点，item中其他控件也可以获取焦点,如果文本的文字过多，会被后面的图标盖住，首先设置单行android:singleline="true"再设置右边距就盖不住android:padding="40dp"

需要添加下面三项

//让泡泡窗额度条目获取到焦点 
    popupwindow.setfocusable(true); 
    //设置背景图 
    popupwindow.setbackgrounddrawable(new bitmapdrawable()); 
    popupwindow.setoutsidetouchable(true); 

主布局文件activity_main.xml

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" 
  xmlns:tools="http://schemas.android.com/tools" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:background="#22000000" 
  tools:context=".mainactivity" > 
  <relativelayout  
    android:layout_margintop="40dp" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_centerhorizontal="true" 
    > 
  <edittext 
    android:id="@+id/et" 
    android:singleline="true" 
    android:padding="40dp" 
    android:layout_width="300dp" 
    android:layout_height="40dp" 
    /> 
  <imageview  
    android:layout_width="wrap_content" 
    android:layout_height="40dp" 
    android:id="@+id/iv_select" 
    android:layout_centervertical="true" 
    android:background="@drawable/ic_launcher" 
    android:layout_alignright="@id/et" 
    /> 
  </relativelayout> 
</relativelayout> 

每一个条目的布局文件item_list.xml

<?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:padding="5dp" 
  android:orientation="horizontal" > 
  <textview  
    android:layout_width="0dp" 
    android:layout_height="wrap_content" 
    android:drawableleft="@drawable/ic_launcher" 
    android:gravity="center_vertical" 
    android:drawablepadding="3dp" 
    android:text="123" 
    android:id="@+id/tv_number" 
    android:layout_weight="1" 
    /> 
  <imageview  
    android:id="@+id/iv_delete" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:background="@drawable/ic_launcher" 
    /> 
</linearlayout> 

逻辑代码mainactivity.java

package com.ldw.select; 
import java.util.arraylist; 
import android.app.activity; 
import android.graphics.drawable.bitmapdrawable; 
import android.os.bundle; 
import android.view.view; 
import android.view.view.onclicklistener; 
import android.view.viewgroup; 
import android.widget.adapterview; 
import android.widget.adapterview.onitemclicklistener; 
import android.widget.baseadapter; 
import android.widget.edittext; 
import android.widget.imageview; 
import android.widget.listview; 
import android.widget.popupwindow; 
import android.widget.textview; 
public class mainactivity extends activity implements onclicklistener{ 
  private imageview iv_select; 
  private edittext et; 
  private arraylist<string> list = new arraylist<string>(); 
  private textview tv_number; 
  private imageview iv_delete; 
  private listview listview; 
  private popupwindow popupwindow; 
  @override 
  protected void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    initview(); 
    initlistener();  
    initdata(); 
  } 
  private void initview() { 
    setcontentview(r.layout.activity_main); 
    iv_select = (imageview) findviewbyid(r.id.iv_select); 
    et = (edittext) findviewbyid(r.id.et); 
  } 
  private void initlistener() { 
    iv_select.setonclicklistener(this); 
  } 
  //集合中添加数据 
  private void initdata() { 
    for(int i = 0; i< 20; i++){ 
      list.add(1340000000 + i + ""); 
    } 
    initlistview(); 
  } 
  //初始化列表 
  private void initlistview(){ 
    listview = new listview(this); 
    //设置listview的背景图 
    listview.setbackgroundresource(r.drawable.ic_launcher); 
    //让listview的滚动条不可见 
    listview.setverticalscrollbarenabled(false); 
    myadapter adapter = new myadapter(); 
    listview.setadapter(adapter); 
    listview.setonitemclicklistener(new onitemclicklistener(){ 
      @override 
      public void onitemclick(adapterview<?> parent, view view, 
          int position, long id) { 
        et.settext(list.get(position)); 
        //关闭泡泡窗 
        popupwindow.dismiss(); 
      } 
    }); 
  } 
  //泡泡窗实现点击显示列表,泡泡窗默认是不获取焦点的 
  private void shownumberlist(){ 
    if(popupwindow == null){ 
    //泡泡窗的填充,设置宽高 
    popupwindow = new popupwindow(listview, et.getwidth(), 300); 
    } 
    //让泡泡窗额度条目获取到焦点 
    popupwindow.setfocusable(true); 
    //设置背景图 
    popupwindow.setbackgrounddrawable(new bitmapdrawable()); 
    popupwindow.setoutsidetouchable(true); 
    //第一个参数是依附哪一个参数下,x轴，y轴的偏移量，相对于第一个参数的左下角的位置 
    popupwindow.showasdropdown(et, 0, 0); 
  } 
  @override 
  public void onclick(view v){ 
    switch (v.getid()){ 
      case r.id.iv_select: 
        //点击弹出列表 
        shownumberlist(); 
        break; 
    } 
  } 
  //listview填充 
  class myadapter extends baseadapter{ 
    @override 
    public int getcount() { 
      return list.size(); 
    } 
    @override 
    public object getitem(int position) { 
      return null; 
    } 
    @override 
    public long getitemid(int position) { 
      return 0; 
    } 
    @override 
    public view getview(final int position, view convertview, viewgroup parent) { 
      final view view = view.inflate(mainactivity.this, r.layout.item_list, null); 
      tv_number = (textview) view.findviewbyid(r.id.tv_number); 
      iv_delete = (imageview) view.findviewbyid(r.id.iv_delete); 
      tv_number.settext(list.get(position)); 
      //删除按键 
      iv_delete.setonclicklistener(new onclicklistener(){ 
        @override 
        public void onclick(view v) { 
          //删除条目 
          list.remove(position); 
          //更新页面 
          notifydatasetchanged(); 
          //根据当前条目的个数设置，当前条目的高度 
          int listviewheight = list.size() * view.getheight(); 
          if(listviewheight > 300){ 
            listviewheight = 300; 
          }else{ 
            listviewheight = listviewheight; 
          } 
          //更新泡泡窗的高度 
          popupwindow.update(et.getwidth(), listviewheight); 
          //删除完了，泡泡窗小消失 
          if(list.size() == 0){ 
            popupwindow.dismiss(); 
            //下拉条消失 
            iv_select.setvisibility(view.gone); 
          } 
        } 
      }); 
      return view; 
    } 
  } 
} 

以上所述是小编给大家介绍的android仿泡泡窗实现下拉菜单条实例代码，希望对大家有所帮助