在Android上创建一个PopupWindow

1. 为PopupWindow创建一个Layout---popup_window_layout.xml\

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:id="@+id/LinearLayout_popupwindow" android:layout_width="wrap_content"android:layout_height="wrap_content"><TextView android:id="@+id/TextView_popupwindow"android:layout_width="wrap_content" android:layout_height="wrap_content"android:text="I am PopupWindow..." android:drawableTop="@drawable/controlbar_homepage"></TextView></LinearLayout>

2. 初始化PopupWindow，并提供两个方法去控制PopupWindow的显示与消失

/** * show popup window */private void showPopupWindow() {// if popupWindow is null then initialize itif (popupWindow == null) {// get layout inflater from system service of LAYOUT_INFLATER_SERVICELayoutInflater layoutInflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);View view = layoutInflater.inflate(R.layout.popup_window_layout,null);popupWindow = new PopupWindow(view, LayoutParams.FILL_PARENT,LayoutParams.WRAP_CONTENT);}// show popup window on specified location and update itpopupWindow.showAtLocation(this.findViewById(R.id.LinearLayout_main),Gravity.CENTER_VERTICAL, 20, 20);popupWindow.update();}/** * clos popup window if popup window is not null */private void closePopupWindow() {if (popupWindow != null) {popupWindow.dismiss();}}

3. 创建一个Button控件来控制PopupWindow的显示与消失

// initialize bShow button and set an OnClickListener to itbShow = (Button) this.findViewById(R.id.Button_show_popupwindow);bShow.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (!isClick) {showPopupWindow();isClick = true;} else {closePopupWindow();isClick = false;}}});

注意事项：

PopupWindow必须在click action中显示或者是开启一个线程去显示，不能直在
oncreate的时候显示一个PopupWindow

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