android弹出窗口的实现（PopupWindow）
fmms
12年前
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.
首先定义新浪微博的顶部栏,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="天堂没有路" 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>主要是为了实现一个这样的界面：
接下来定义弹出对话框的布局文件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="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>自定义一个适配器：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; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return list.get(position); } @Override public long getItemId(int position) { return position; } @Override public 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; } }最后是我要实现弹出对话框的核心类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("天堂没有路"); tvtitle.setOnClickListener(new View.OnClickListener() { @Override public 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); // 加载数据 groups = new ArrayList<String>(); groups.add("全部"); groups.add("我的微博"); groups.add("好友"); groups.add("亲人"); groups.add("同学"); groups.add("朋友"); 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, 300, 350); } // 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", "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), 1000) .show(); if (popupWindow != null) { popupWindow.dismiss(); } } }); } }这样就完成了一个弹出对话框的效果，下面来看一下吧！ 
再看一张新浪微博的弹出对话框效果：
转自：http://blog.csdn.net/wangkuifeng0118/article/details/7368157