Android入门第十篇之PopupWindow

 

本文来自http://blog.csdn.net/hellogv/ ，引用必须注明出处！    

       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：

<?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：

 

<?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：

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);      }        }