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();         }       }     });   } }