Android入门第十篇之PopupWindow

介绍过AlertDialog之后，接下来就介绍一下PopupWindow这种对话框。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。

贴出本例中运行的结果图：



main.xml的源码如下：

[xhtml] view
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<?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：



[xhtml] view
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<?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>



接下来是程序源码：

[java] view
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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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