PopupWindow罩层实现
例子:



PopupWindowActivity.java

package com.popup;import android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout.LayoutParams;import android.widget.PopupWindow;public class PopupwindowActivity extends Activity {public PopupWindow mPopupWindow;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);View popupWindow_view = getLayoutInflater().inflate(R.layout.control, null,false);mPopupWindow = new PopupWindow(popupWindow_view, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT,true);Button show = (Button) findViewById(R.id.button1);show.setOnClickListener(new Button.OnClickListener() {@Overridepublic void onClick(View v) {mPopupWindow.showAtLocation(findViewById(R.id.linear),Gravity.RIGHT | Gravity.BOTTOM, 0, 0);}});mPopupWindow.update(); //获取自定义布局文件popup.xml的视图Button btn1 = (Button)popupWindow_view.findViewById(R.id.button2);btn1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {mPopupWindow.dismiss();}});}}

<?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"  android:id="@+id/linear">    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/hello" />    <Button        android:id="@+id/button1"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Button" /></LinearLayout>

<?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="#b0000000"    android:orientation="vertical" >    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="TextView" />    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center_vertical|center_horizontal"        android:text="Button" /></LinearLayout>