PopupWindow是阻塞对话框，只有在外部线程或者PopupWindow本身做退出操作才行。PopupWindow完全依赖Layout做外观，在常见的开发中PopupWindow应该会与AlertDialog混用使用。
main.xml的源码如下：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button
android:id="@+id/Button01"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="PopupWindow演示"
/>
</LinearLayout>
这里的PopupWindow是个登录框，点 确定 则自动填写，点 取消 则关闭PopupWindow。
popupwindow.xml的源码：
<?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:orientation="vertical"
android:background="#000000">
<TextView
android:id="@+id/username_view"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:text="用户名"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_width="fill_parent"
/>
<EditText
android:id="@+id/username_edit"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:capitalize="none"
android:textAppearance="?android:attr/textAppearanceMedium"
/>
<TextView
android:id="@+id/password_view"
android:layout_height="wrap_content"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:text="密码"
android:textAppearance="?android:attr/textAppearanceMedium"
android:layout_width="fill_parent"
/>
<EditText
android:id="@+id/password_edit"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_marginLeft="20dip"
android:layout_marginRight="20dip"
android:capitalize="none"
android:password="true"
android:textAppearance="?android:attr/textAppearanceMedium"
/>
<LinearLayout
android:id="@+id/LinearLayout01"
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/BtnOK"
android:layout_weight="100"
android:text="确定"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="100"
android:text="取消"
android:id="@+id/BtnCancel"
/>
</LinearLayout>
</LinearLayout>
接下来是程序代码：
package com.testAlertDialog;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.Editable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.PopupWindow;
public class testAlertDialog extends Activity {
Button btnPopupWindow;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 定义按钮
btnPopupWindow = (Button) this.findViewById(R.id.Button01);
btnPopupWindow.setOnClickListener(new ClickEvent());
}
// 统一处理按键事件
class ClickEvent implements OnClickListener {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (v == btnPopupWindow) {
showPopupWindow(testAlertDialog.this,
testAlertDialog.this.findViewById(R.id.Button01));
}
}
}
public void showPopupWindow(Context context, View parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final View vPopupWindow = inflater.inflate(R.layout.popupwindow, null,
false);
final PopupWindow pw = new PopupWindow(vPopupWindow, 300, 300, true);
// OK按钮及其处理事件
Button btnOK = (Button) vPopupWindow.findViewById(R.id.BtnOK);
btnOK.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 设置文本框内容
EditText edtUsername = (EditText) vPopupWindow
.findViewById(R.id.username_edit);
edtUsername.setText("username");
EditText edtPassword = (EditText) vPopupWindow
.findViewById(R.id.password_edit);
edtPassword.setText("password");
}
});
// Cancel按钮及其处理事件
Button btnCancel = (Button) vPopupWindow.findViewById(R.id.BtnCancel);
btnCancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
pw.dismiss();// 关闭
}
});
// 显示popupWindow对话框
pw.showAtLocation(parent, Gravity.CENTER, 0, 0);
}
}
