Android用PopupWindow实现新浪微博的分组信息实例

最近看到新浪微博顶部栏的微博分组效果很炫，从网上查了一些资料明白原来是用popupwindow实现的，今天自己也写了一个例子实现了这种效果，希望对大家有帮助。

popupwindow就是弹出窗口的意思，类似windows下面的开始按钮。popupwindow可以实现浮层效果，而且可以自定义显示位置，出现和退出时的动画.

效果如下：

实现思路：

在一个popupwindow里放一个listview，从而来达到分组信息的实现！

具体主要实现代码：
group_list.xml:

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:layout_margin="0.0px" 
  android:background="@drawable/group_bg" 
  android:orientation="vertical" 
  android:paddingleft="0.0sp" 
  android:paddingright="0.0sp" > 
 
  <textview 
    android:id="@+id/groupall" 
    style="@style/grouplist_item_textview" 
    android:layout_width="fill_parent" 
    android:layout_height="@dimen/group_item_height" 
    android:background="@drawable/grouplist_fixed_item_bg" 
    android:gravity="center" 
    android:text="全部" /> 
 
  <imageview 
    android:id="@+id/iv_group_list_bg_divider" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="0.0px" 
    android:background="@drawable/group_divider" 
    android:padding="0.0px" /> 
 
  <listview 
    android:id="@+id/lvgroup" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_weight="0.0" 
    android:cachecolorhint="#00000000" 
    android:divider="@drawable/group_divider" 
    android:dividerheight="2.0px" 
    android:drawselectorontop="true" 
    android:fadingedgelength="0.0sp" 
    android:listselector="@drawable/grouplist_item_bg" /> 
 
</linearlayout> 

group_item_view.xml:

<?xml version="1.0" encoding="utf-8"?> 
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="fill_parent" 
  android:layout_height="@dimen/group_item_height" 
  android:orientation="vertical" > 
 
  <textview 
    android:id="@+id/groupitem" 
    style="@style/grouplist_item_textview" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:gravity="center" /> 
 
</linearlayout> 

activity中的代码：

package com.jiahui.popwindow; 
 
import java.util.arraylist; 
import java.util.list; 
 
import com.jiahui.adapter.groupadapter; 
 
import android.app.activity; 
import android.content.context; 
import android.graphics.drawable.bitmapdrawable; 
import android.os.bundle; 
import android.util.log; 
import android.view.layoutinflater; 
import android.view.view; 
import android.view.windowmanager; 
import android.widget.adapterview; 
import android.widget.adapterview.onitemclicklistener; 
import android.widget.arrayadapter; 
import android.widget.button; 
import android.widget.listview; 
import android.widget.popupwindow; 
import android.widget.textview; 
import android.widget.toast; 
 
public class poupwindowdemoactivity extends activity { 
 
  private popupwindow popupwindow; 
 
  private listview lv_group; 
 
  private view view; 
 
  private view top_title; 
 
  private textview tvtitle; 
 
  private list<string> groups; 
 
  public void oncreate(bundle savedinstancestate) { 
    super.oncreate(savedinstancestate); 
    setcontentview(r.layout.main); 
 
    top_title = this.findviewbyid(r.id.top_title); 
 
    tvtitle = (textview) top_title.findviewbyid(r.id.tvtitle); 
 
    tvtitle.settext("做一个低调的码农"); 
 
    tvtitle.setonclicklistener(new view.onclicklistener() { 
 
      @override 
      public void onclick(view v) { 
        showwindow(v); 
      } 
    }); 
 
  } 
 
  /** 
   * 显示 
   * 
   * @param parent 
   */ 
  private void showwindow(view parent) { 
 
    if (popupwindow == null) { 
      layoutinflater layoutinflater = (layoutinflater) getsystemservice(context.layout_inflater_service); 
 
      view = layoutinflater.inflate(r.layout.group_list, null); 
 
      lv_group = (listview) view.findviewbyid(r.id.lvgroup); 
      // 加载数据 
      groups = new arraylist<string>(); 
      groups.add("我的微博"); 
      groups.add("好友"); 
      groups.add("亲人"); 
      groups.add("陌生人"); 
 
      groupadapter groupadapter = new groupadapter(this, groups); 
      lv_group.setadapter(groupadapter); 
      // 创建一个popuwidow对象 
      popupwindow = new popupwindow(view, 200, 250); 
    } 
 
    // 使其聚集 
    popupwindow.setfocusable(true); 
    // 设置允许在外点击消失 
    popupwindow.setoutsidetouchable(true); 
 
    // 这个是为了点击“返回back”也能使其消失，并且并不会影响你的背景 
    popupwindow.setbackgrounddrawable(new bitmapdrawable()); 
    windowmanager windowmanager = (windowmanager) getsystemservice(context.window_service); 
    // 显示的位置为:屏幕的宽度的一半-popupwindow的高度的一半 
    int xpos = windowmanager.getdefaultdisplay().getwidth() / 2 
        - popupwindow.getwidth() / 2; 
 
    log.i("coder", "windowmanager.getdefaultdisplay().getwidth()/2:" 
        + windowmanager.getdefaultdisplay().getwidth() / 2); 
    // 
    log.i("coder", "popupwindow.getwidth()/2:" + popupwindow.getwidth() / 2); 
 
    log.i("coder", "xpos:" + xpos); 
 
    popupwindow.showasdropdown(parent, xpos, 0); 
 
    lv_group.setonitemclicklistener(new onitemclicklistener() { 
 
      @override 
      public void onitemclick(adapterview<?> adapterview, view view, 
          int position, long id) { 
 
        toast.maketext(poupwindowdemoactivity.this, 
            "groups.get(position)" + groups.get(position), 1000) 
            .show(); 
 
        if (popupwindow != null) { 
          popupwindow.dismiss(); 
        } 
      } 
    }); 
  } 
} 

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。