PopupWindow的使用

PopupWindow还是比较常用的，具有对话框的特性，而且位置灵活，现在主要涉及的知识点在于popwindow的宽高测量上

1、PopWindow的打开关闭

button.setOnClickListener(new OnClickListener() {

	@Override
	public void onClick(View v) {
		if (pwMyPopWindow.isShowing()) {
			popWindow.dismiss();// 关闭
		} else {
			popWindow.showAsDropDown(button);// 显示
		}
	}
});

 

2.PopWindow的创建

// 加载布局填充数据
LayoutInflater inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.task_detail_popupwindow, null);
popupList = (ListView) layout.findViewById(R.id.lv_popup_list);
popWindow = new PopupWindow(layout);
// 可以获得焦点，ListView才可点击
popWindow.setFocusable(true);
popupList.setAdapter(new SimpleAdapter(MyQQNews.this, moreList,
			R.layout.list_item_popupwindow, new String[] { "share_key" },
			new int[] { R.id.tv_list_item }));
popupList.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
			}
		});

// 控制popupwindow的宽度和高度自适应
popupList.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
popWindow.setWidth(popupList.getMeasuredWidth());
popWindow.setHeight(popupList.getMeasuredHeight()* NUM_OF_VISIBLE_LIST_ROWS);

// 控制popupwindow点击屏幕其他地方消失
popWindow.setBackgroundDrawable(this.getResources().getDrawable(
		R.drawable.bg_popupwindow));// 设置背景图片，不能在布局中设置，要通过代码来设置
popWindow.setOutsideTouchable(true);// 触摸popupwindow外部，popupwindow消失。这个要求你的popupwindow要有背景图片才可以成功，如上

 

3、一些布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical" >
      
    <TextView 
        android:id="@+id/tv_list_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:minHeight="30dp"
        android:minWidth="120dp"
        android:textSize="20sp"
        android:textColor="@color/popupwindow_list_item_text_selector"
        />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >
    <ListView
        android:id="@+id/lv_popup_list"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:listSelector="#00000000"
        android:focusableInTouchMode="true"
         />

</LinearLayout>