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);
	}
	
}