Android入门第十篇之PopupWindow

               

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       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); } }

           

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