Android UI开发第三篇——popupwindow

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PopupWindow在android.widget包下，弹出窗口的形式展示。官方文档对该控件的描述是：“一个弹出窗口控件，可以用来显示任意视图(View)，而且会浮动在当前活动(activity)的顶部”。PopupWindow可以让我们实现多种自定义控件，例如：menu、alertdialog等弹窗似的View。

Popupwindow需要在onCreate时初始化、通过触发事件展示出来。

public class ShowPopupWindow extends Activity implements View.OnClickListener {View view;PopupWindow pop;Button btnShowAsDrawDown;Button btnShowAsDrawDown1;Button btnShowAtLocation;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.popup_activity);btnShowAsDrawDown = (Button) findViewById(R.id.btnShowAsDrawDown);btnShowAsDrawDown.setOnClickListener(this);btnShowAsDrawDown1 = (Button) findViewById(R.id.btnShowAsDrawDown1);btnShowAsDrawDown1.setOnClickListener(this);btnShowAtLocation = (Button) findViewById(R.id.btnShowAt);btnShowAtLocation.setOnClickListener(this);initPopupWindow();}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubswitch (v.getId()) {case R.id.btnShowAsDrawDown:if (pop.isShowing()) {pop.dismiss();} else {pop.showAsDropDown(v);}break;case R.id.btnShowAsDrawDown1:if (pop.isShowing()) {pop.dismiss();} else {pop.showAsDropDown(v, 0, -160);}break;default:if (pop.isShowing()) {pop.dismiss();} else {pop.showAtLocation(findViewById(R.id.main),Gravity.CENTER_HORIZONTAL, 0, 0);}break;}}private void initPopupWindow() {view = this.getLayoutInflater().inflate(R.layout.popup_window, null);pop = new PopupWindow(view, ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT);pop.setOutsideTouchable(true);view.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubpop.dismiss();}});}}

popup_activity.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:id="@+id/main"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="pop demo!" />    <Button        android:id="@+id/btnShowAsDrawDown"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="Show as drawndown(one parameter)" />    <Button        android:id="@+id/btnShowAsDrawDown1"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="Show as drawndown(three parameters)" />    <Button        android:id="@+id/btnShowAt"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="Show At Location" /></LinearLayout>

popup_window.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:background="#d3d3d3"    android:gravity="center_horizontal"    android:orientation="vertical" >    <Button        android:id="@+id/btn_pop"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_margin="10dip"        android:text="Close" /></LinearLayout>

/**

* @author 张兴业

* http://blog.csdn.net/xyz_lmn

* 我的新浪微博：@张兴业TBOW