android快顯視窗的實現（PopupWindow）

           最近看到新浪微博頂部欄的微博分組效果很炫，從網上查了一些資料明白原來是用PopupWindow實現的，今天自己也寫了一個例子實現了這種效果，希望對大家有協助。

         PopupWindow就是快顯視窗的意思，類似windows下面的開始按鈕。PopupWindow可以實現浮層效果，而且可以自訂顯示位置，出現和退出時的動畫.

            首先定義新浪微博的頂部欄,title_two_button.xml和main.xml

      

<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="wrap_content" >    <TextView        android:id="@+id/tvtitle"        android:layout_width="fill_parent"        android:layout_height="45dip"        android:background="@drawable/search_bg"        android:gravity="center"        android:text="天堂沒有路"        android:textColor="@color/black"        android:textSize="25dip" />    <Button        android:id="@+id/btn_title_left"        android:layout_width="50dip"        android:layout_height="35dip"        android:layout_gravity="center_vertical"        android:background="@drawable/title_button"        android:textColor="@color/white" />    <Button        android:id="@+id/btn_title_right"        android:layout_width="50dip"        android:layout_height="35dip"        android:layout_gravity="right"        android:layout_marginRight="2dip"        android:layout_marginTop="4dip"        android:background="@drawable/title_button2"        android:textColor="@color/white" /></FrameLayout>

<?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:background="@android:color/white"    android:orientation="vertical" >    <include        android:id="@+id/top_title"        layout="@layout/title_two_button" /></LinearLayout>

主要是為了實現一個這樣的介面：

接下來定義彈出對話方塊的布局檔案group_list.xml和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="fill_parent"    android:background="@drawable/group_bg"    android:orientation="vertical"     >    <ImageView        android:id="@+id/iv_group_list_bg_divider"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:background="@drawable/group_divider"         />    <ListView        android:id="@+id/lvGroup"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:divider="@drawable/group_divider"          /></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"       android:textColor="#ffffff"       android:textSize="18dp"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:gravity="center" /></LinearLayout>

自訂一個適配器：GroupAdapter

import java.util.List;import cn.com.karl.popwindow.R;import android.content.Context;import android.graphics.Color;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class GroupAdapter extends BaseAdapter {private Context context;private List<String> list;public GroupAdapter(Context context, List<String> list) {this.context = context;this.list = list;}@Overridepublic int getCount() {return list.size();}@Overridepublic Object getItem(int position) {return list.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup viewGroup) {ViewHolder holder;if (convertView==null) {convertView=LayoutInflater.from(context).inflate(R.layout.group_item_view, null);holder=new ViewHolder();convertView.setTag(holder);holder.groupItem=(TextView) convertView.findViewById(R.id.groupItem);}else{holder=(ViewHolder) convertView.getTag();}holder.groupItem.setTextColor(Color.BLACK);holder.groupItem.setText(list.get(position));return convertView;}static class ViewHolder {TextView groupItem;}}

最後是我要實現彈出對話方塊的核心類PoupWindowDemoActivity

import java.util.ArrayList;import java.util.List;import cn.com.karl.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.Window;import android.view.WindowManager;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;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);this.requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.main);top_title = this.findViewById(R.id.top_title);tvtitle = (TextView) top_title.findViewById(R.id.tvtitle);tvtitle.setText("天堂沒有路");tvtitle.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {showWindow(v);}});}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);// 載入資料groups = new ArrayList<String>();groups.add("全部");groups.add("我的微博");groups.add("好友");groups.add("親人");groups.add("同學");groups.add("朋友");groups.add("陌生人");GroupAdapter groupAdapter = new GroupAdapter(this, groups);lv_group.setAdapter(groupAdapter);// 建立一個PopuWidow對象popupWindow = new PopupWindow(view, 300, 350);}// 使其聚集popupWindow.setFocusable(true);// 設定允許在外點擊消失popupWindow.setOutsideTouchable(true);// 這個是為了點擊“返回Back”也能使其消失，並且並不會影響你的背景popupWindow.setBackgroundDrawable(new BitmapDrawable());WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);// 顯示的位置為:螢幕的寬度的一半-PopupWindow的高度的一半int xPos = windowManager.getDefaultDisplay().getWidth() / 2- popupWindow.getWidth() / 2;Log.i("coder", "xPos:" + xPos);popupWindow.showAsDropDown(parent, xPos, 0);lv_group.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view,int position, long id) {Toast.makeText(PoupWindowDemoActivity.this,groups.get(position), 1000).show();if (popupWindow != null) {popupWindow.dismiss();}}});}}

這樣就完成了一個彈出對話方塊的效果，下面來看一下吧！

再看一張新浪微博的彈出對話方塊效果：

已經完成，我們可以把這項功能加入自己的做的新浪微博裡，為自己的應用增添點特色色彩吧！