Android入门第十篇之PopupWindow[转]

       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);  
    }  
      
}

PopupWindow.showAtLocation参数：

第一个参数指定PopupWindow的锚点view，即依附在哪个view上。第二个参数指定起始点为parent的右下角，第三个参数设置以parent的右下角为原点，向左、上各偏移10像素。

本文来自http://blog.csdn.net/hellogv/article/details/5956358