Android用PopupWindow实现新浪微博的分组信息实例

<?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> 

<?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> 

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(); 
        } 
      } 
    }); 
  } 
}