Android组件popupwindow使用方法详解

先看效果： 

现在很多的应用效果都需要做的炫些，像UC，以及天天静听，效果很炫的，源码已经对外开放了，有兴趣的可以去研究下的 

上源码

main.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="500dp"
 android:orientation="vertical" 
 android:background="@android :color/white"
 >
 <include android:id="@+id/top_title"
 layout="@layout/title_two_button"/>
 <Button 
 android:id="@+id/bb"
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="button"
 />
</LinearLayout>

title_two_button.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="天下第一"
 android:textColor="@color/black"
 android:textSize="25dip" />
 <Button
 android:id="@+id/btn_title_left"
 android:layout_width="49dip"
 android:layout_height="36dip"
 android:layout_gravity="center_vertical"
 android:background="@drawable/title_button"
 android:textColor="@color/white" />
 <Button
 android:id="@+id/btn_title_right"
 android:layout_width="49dip"
 android:layout_height="36dip"
 android:layout_gravity="right"
 android:layout_marginRight="2dip"
 android:layout_marginTop="4dip"
 android:background="@drawable/title_button2"
 android:textColor="@color/white" />
</FrameLayout>

group_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:orientation="vertical" android:paddingLeft="0.0sp" android:paddingRight="0.0sp" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_margin="0.0px"
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:background="@drawable/group_bg">
 <ImageView 
 android:id="@+id/iv_group_list_bg_divider" 
 android:background="@drawable/group_divider" 
 android:padding="0.0px" 
 android:layout_width="fill_parent" 
 android:layout_height="wrap_content" 
 android:layout_margin="0.0px" />
 <ListView 
 android:id="@+id/lvGroup" 
 android:fadingEdgeLength="0.0sp" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 android:listSelector="@drawable/grouplist_item_bg" 
 android:drawSelectorOnTop="true" 
 android:cacheColorHint="#00000000" 
 android:divider="@drawable/group_divider" 
 android:dividerHeight="2.0px" 
 android:layout_weight="0.0" />
</LinearLayout>

group_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="@dimen/group_item_height"
 xmlns:android="http://schemas.android.com/apk/res/android">
 <TextView 
 android:gravity="center" 
 android:id="@+id/groupItem" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 style="@style/grouplist_item_textview" />
</LinearLayout>

好了，这些都是其中用到的布局文件,开始重头戏

package jk.activity;
import java.util.ArrayList;
import java.util.List;
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;
 private Button button;
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 button = (Button)findViewById(R.id.bb);
 top_title = this.findViewById(R.id.top_title);
 tvtitle = (TextView) top_title.findViewById(R.id.tvtitle);
 tvtitle.setText("天下第一");
 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("女儿国");
 groups.add("西游");
 groups.add("大话");
 groups.add("大唐");
 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();
 }
 }
 });
 }
}

在这里还需要用到adapter，用到较多一般有baseadapter，simpleadapter，baseadapter挺强大的，不过simpleadapter扩展性挺不错的，可以满足自定义的需求，如果你理解输入输出流很快就能理解adapter的，他就是装备数据的

package jk.activity;
import java.util.List;
import android.content.Context;
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.setText(list.get(position));
 return convertView;
 }
 static class ViewHolder {
 TextView groupItem;
 }
}

对于adapter，最重要是getView(int position, View convertView, ViewGroup viewGroup)这个方法的，菜已上完，各位慢慢享用。

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