android中popupwindow的点滴

java类：

Java代码

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() {

@Override
public 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);

/**
* layout                           PopupWindow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() {
@Override
public 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() {

@Override
public 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代码

<?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代码

<?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代码

<?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；

Java代码


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：

Java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。

Java代码


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。

Java代码


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