android中popupwindow的点滴

java类：

package com.tony.PopupWindow;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.graphics.drawable.ColorDrawable;import android.os.Bundle;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.Button;import android.widget.ListView;import android.widget.PopupWindow;import android.widget.SimpleAdapter;import android.widget.Toast;public class PopupWindowActivity extends Activity {private static final String TAG = "PopupWindowActivity";private List<Map<String, String>> list = new ArrayList<Map<String, String>>();private int state;private Button myButton;private ListView menulist;private View layout;private PopupWindow pop;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);HashMap<String, String> map1 = new HashMap<String, String>();map1.put("menuItemName", "系统设置");list.add(map1);HashMap<String, String> map2 = new HashMap<String, String>();map2.put("menuItemName", "自助更新");list.add(map2);HashMap<String, String> map3 = new HashMap<String, String>();map3.put("menuItemName", "关于");list.add(map3);HashMap<String, String> map4 = new HashMap<String, String>();map4.put("menuItemName", "搜索");list.add(map4);HashMap<String, String> map5 = new HashMap<String, String>();map5.put("menuItemName", "退出");list.add(map5);myButton = (Button) findViewById(R.id.button);myButton.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {if (state == 1 && pop.isShowing()) {state = 0;pop.dismiss();} else {/***弹出自定义的菜单***/layout = getLayoutInflater().inflate(R.layout.menu_layout,null);menulist = (ListView) layout.findViewById(R.id.menulist);SimpleAdapter listAdapter = new SimpleAdapter(PopupWindowActivity.this, list, R.layout.menu_item,new String[] { "menuItemName" },new int[] { R.id.menuitem });menulist.setAdapter(listAdapter);/** * layoutPopupWindow所显示的界面 * myButton.getWidth()设置PopupWindow宽度 * myButton.getHeight() * 3 + 5设置PopupWindow宽度高度 */pop = new PopupWindow(layout,myButton.getWidth(),myButton.getHeight() * 3 + 5);ColorDrawable cd = new ColorDrawable(-0000);pop.setBackgroundDrawable(cd);// pop.showAsDropDown(v);pop.update();pop.setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED);pop.setTouchable(true);// 设置popupwindow可点击pop.setOutsideTouchable(true);// 设置popupwindow外部可点击pop.setFocusable(true);//获取焦点/*设置popupwindow的位置*/pop.showAtLocation(layout,(Gravity.BOTTOM - myButton.getHeight())| Gravity.LEFT, 0, 2 * myButton.getHeight());state = 1;pop.setTouchInterceptor(new View.OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {/****如果点击了popupwindow的外部，popupwindow也会消失****/if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {pop.dismiss();return true; }return false;}});/****点击listview中item的处理****/menulist.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1,int arg2, long arg3) {switch (arg2) {case 0:Toast.makeText(getApplicationContext(), "系统设置",Toast.LENGTH_SHORT).show();pop.dismiss();break;case 1:Toast.makeText(getApplicationContext(), "自动更新",Toast.LENGTH_SHORT).show();pop.dismiss();break;case 2:Toast.makeText(getApplicationContext(), "关于",Toast.LENGTH_SHORT).show();pop.dismiss();break;case 3:Toast.makeText(getApplicationContext(), "搜索",Toast.LENGTH_SHORT).show();pop.dismiss();break;case 4:Toast.makeText(getApplicationContext(), "退出",Toast.LENGTH_SHORT).show();pop.dismiss();break;}}});}}});}}

布局文件：

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="fill_parent"    android:orientation="vertical" >    <Button        android:layout_width="100dp "        android:layout_height="wrap_content"        android:id="@+id/button"        android:text="菜单" /></LinearLayout>

menu_layout.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="wrap_content"    android:background="@drawable/a2"     >    <ListView        android:id="@+id/menulist"        android:layout_width="fill_parent"        android:layout_height="wrap_content" >    </ListView></LinearLayout>

menu_item.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="wrap_content" >    <TextView        android:id="@+id/menuitem"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="15dp"        android:textColor="#FFFFFF"        android:textSize="20sp" /></LinearLayout>

下面是运行的结果：

点击popupwindow会有相应的处理，点击返回键或者是popupwindow外部的区域popupwindow也会消失，这也是很多人想要的效果。

需要强调的一些事儿：

1.PopuWindow 的大小由下面代码控制；

new PopupWindow(view, ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT)；

2.需要顺利让PopUpWindow dimiss（即点击PopuWindow之外的地方此或者back键PopuWindow会消失）；PopUpWindow的背景不能为空。必须在popuWindow.showAsDropDown(v);或者其它的显示PopuWindow方法之前设置它的背景不为空：如下面两行代码：

ColorDrawablecd = new ColorDrawable(-0000);popu.setBackgroundDrawable(cd);

注意这里设置背景并不会覆盖xml文件定义的背景。

3.当有popuWindow.setFocusable(false);的时候，说明PopuWindow不能获得焦点，即使设置设置了背景不为空也不能点击外面消失，只能由dismiss()消失，但是外面的View的事件还是可以触发,back键也可以顺利dismiss掉。当设置为popuWindow.setFocusable(true);的时候，加上下面两行设置背景代码，点击外面和Back键才会消失。

ColorDrawable cd = new ColorDrawable(-0000);pop.setBackgroundDrawable(cd);

4.这里设置显示PopuWindow之后在外面点击是否有效。如果为false的话，那么点击PopuWindow外面并不会关闭PopuWindow。当然这里很明显只能在Touchable下才能使用。

ColorDrawable cd = new ColorDrawable(-0000);pop.setBackgroundDrawable(cd);

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