学步园

在使用手机的时候看到这个效果，上网查了一下，是使用了PopupWindow实现的

在此记录一下：

主要代码：

</p> <p>import java.util.ArrayList;<br /> import java.util.HashMap;<br /> import java.util.List;<br /> import java.util.Map;</p> <p>import android.app.ListActivity;<br /> import android.content.Context;<br /> import android.os.Bundle;<br /> import android.view.Gravity;<br /> import android.view.LayoutInflater;<br /> import android.view.View;<br /> import android.view.WindowManager;<br /> import android.widget.AdapterView;<br /> import android.widget.AdapterView.OnItemClickListener;<br /> import android.widget.ListView;<br /> import android.widget.PopupWindow;<br /> import android.widget.SimpleAdapter;</p> <p>public class PopActivity extends ListActivity implements OnItemClickListener{<br /> private List<Map<String,Object>> list ;<br /> ListView listview;<br /> PopupWindow pw = null;<br /> //头像的Id数组<br /> int head[] = {R.drawable.image1,R.drawable.image2,R.drawable.image3,<br /> R.drawable.image4,R.drawable.image5};</p> <p> /** Called when the activity is first created. */<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> listview = getListView();<br /> initData();//生成几条记录<br /> SimpleAdapter adapter =new SimpleAdapter(this, list,R.layout.people ,new String []{"head","name","num"} , new int []{R.id.head,R.id.text,R.id.num});<br /> setListAdapter(adapter);<br /> listview.setOnItemClickListener(this);<br /> }<br /> public void initData(){<br /> list = new ArrayList<Map<String,Object>>();<br /> for(int i = 0;i<5;i++){<br /> Map<String ,Object> map = new HashMap<String, Object>();<br /> map.put("head", head[i]);<br /> map.put("name","第"+i+"位用户");<br /> map.put("num","12445533"+i);<br /> list.add(map);<br /> }<br /> }<br /> @Override<br /> public void onItemClick(AdapterView<?> arg0, View v, int position, long id) {<br /> // TODO Auto-generated method stub<br /> LayoutInflater factory = LayoutInflater.from(PopActivity.this);<br /> final View textEntryView = factory.inflate(R.layout.paopao_alert_dialog, null);<br /> //获取WindowManager对象<br /> WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);<br /> int envWidth = wm.getDefaultDisplay().getWidth();<br /> int envHeight = wm.getDefaultDisplay().getHeight();<br /> if(pw == null)<br /> {<br /> pw = new PopupWindow(textEntryView);<br /> pw.showAtLocation(v, Gravity.LEFT,0,0); //在父视图的左上方显示<br /> }else if(!pw.isShowing()){<br /> pw = new PopupWindow(textEntryView);<br /> pw.showAtLocation(v, Gravity.LEFT,0,0);<br /> }<br /> int pwH = 70;<br /> int pwW = 166;<br /> int y = -envHeight/2+v.getTop() + pwH;<br /> pw.update(0,y,pwW,pwH); //更新位置。<br /> textEntryView.findViewById(R.id.phone).setOnClickListener(new View.OnClickListener() {<br /> public void onClick(View v) {<br /> // TODO Auto-generated method stub<br /> pw.dismiss();<br /> }</p> <p> });<br /> }<br /> }主要就是OnItemClick()方法中的实现，获取WindowManager ，得到一个PopupWindow对象，然后显示出来，当然在实际中要去响应PopupWindow中的按钮事件了。