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我们。