Android入门之PopupWindow用法实例解析

本文实例介绍一下PopupWindow对话框。PopupWindow是阻塞对话框，只有在外部线程 或者 PopupWindow本身做退出操作才可以执行。PopupWindow完全依赖Layout做外观，在常见的开发中，PopupWindow应该会与AlertDialog常混用。

先贴出本例中运行的结果图：

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"></Button>
</LinearLayout>

下图所示是PopupWindow弹出的截图，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的源码如下：

<?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><Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="100" android:text="取消" android:id="@+id/BtnCancel"></Button></LinearLayout>
</LinearLayout>

接下来是Java程序源码：

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);
}
}

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