Android入门教程(二十一)之PopupWindow (转)

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>

<?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>

<?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);
    }

}