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：

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Buttonandroid:id="@+id/Button01"android:layout_height="wrap_content"android:layout_width="fill_parent"android:text="PopupWindow演示"></Button>
</LinearLayout>

<?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：

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"android:layout_height="wrap_content"
android:orientation="vertical"android:background="#000000">

<TextViewandroid: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"/>

<EditTextandroid: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"/>

<TextViewandroid: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"/>

<EditTextandroid: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"/>

<LinearLayoutandroid:id="@+id/LinearLayout01"android:layout_height="wrap_content"android:layout_width="fill_parent"android:gravity="center"><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/BtnOK"android:layout_weight="100"android:text="确定"></Button><Buttonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_weight="100"android:text="取消"android:id="@+id/BtnCancel"></Button></LinearLayout>
</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="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：

packagecom.testAlertDialog;

importandroid.app.Activity;
importandroid.app.AlertDialog;
importandroid.content.Context;
importandroid.content.DialogInterface;
importandroid.os.Bundle;
importandroid.text.Editable;
importandroid.view.Gravity;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.View.OnClickListener;
importandroid.widget.Button;
importandroid.widget.EditText;
importandroid.widget.PopupWindow;


publicclasstestAlertDialogextendsActivity{
ButtonbtnPopupWindow;
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//定义按钮
btnPopupWindow=(Button)this.findViewById(R.id.Button01);
btnPopupWindow.setOnClickListener(newClickEvent());
}


//统一处理按键事件
classClickEventimplementsOnClickListener{

@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
if(v==btnPopupWindow)
{
showPopupWindow(testAlertDialog.this,
testAlertDialog.this.findViewById(R.id.Button01));
}
}
}

publicvoidshowPopupWindow(Contextcontext,Viewparent){
LayoutInflaterinflater=(LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
finalViewvPopupWindow=inflater.inflate(R.layout.popupwindow,null,false);
finalPopupWindowpw=newPopupWindow(vPopupWindow,300,300,true);

//OK按钮及其处理事件
ButtonbtnOK=(Button)vPopupWindow.findViewById(R.id.BtnOK);
btnOK.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
//设置文本框内容
EditTextedtUsername=(EditText)vPopupWindow.findViewById(R.id.username_edit);
edtUsername.setText("username");
EditTextedtPassword=(EditText)vPopupWindow.findViewById(R.id.password_edit);
edtPassword.setText("password");
}
});

//Cancel按钮及其处理事件
ButtonbtnCancel=(Button)vPopupWindow.findViewById(R.id.BtnCancel);
btnCancel.setOnClickListener(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
pw.dismiss();//关闭
}
});
//显示popupWindow对话框
pw.showAtLocation(parent,Gravity.CENTER,0,0);
}

}