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android之PopupWindow

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用的豌豆荚截图,本来是个动画的,每个过程都有几张,大概就是要实现这个效果,初始状态只有一个Button,当点击show的时候,另外一个页面从底部慢慢升起来,直到覆盖到上一个页面,注意这里不是启用另一个Activity,是用的PopupWindow,当点击dismiss的时候,又慢慢消失。。。这种效果看上去不错,PopupWindow上面可以添加想要添加的控件,比如ListView(注意,如果添加ListView的话,当它弹出来之后,按back键不起作用,它获取不了监听,其余的非ListView控件可以,这里添加了个Button ),下面贴出代码

这是主类MainActivity.java
package com.test.popupwindow;

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout.LayoutParams;
import android.widget.PopupWindow;

publicclass MainActivity extends Activity {
    /** Called when the activity is first created. */

    boolean flag =false;
    PopupWindow popupWindow;

    @Override
    publicvoid onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        init();
    }

    publicvoid init() {
        Button btn_show = (Button) findViewById(R.id.btn_show);
        LayoutInflater inflater = LayoutInflater.from(this);
        View layout = inflater.inflate(R.layout.popup, null);
        popupWindow =new PopupWindow(layout, LayoutParams.FILL_PARENT,
                LayoutParams.FILL_PARENT);
        Button btn_dismiss = (Button) layout.findViewById(R.id.btn_dismiss);
        btn_dismiss.setOnClickListener(new OnClickListener() {

            @Override
            publicvoid onClick(View v) {
                // TODO Auto-generated method stub
                openMenu();
            }
        });
        btn_show.setOnClickListener(new OnClickListener() {

            @Override
            publicvoid onClick(View v) {
                // TODO Auto-generated method stub
                openMenu();
            }
        });
    }

    publicvoid btn_showOnClicked() {
        openMenu();
    }

    publicvoid btn_dismissOnClicked() {
        openMenu();
    }

    publicvoid openMenu() {
        if (!flag) {
            popupWindow.setAnimationStyle(R.style.PopupAnimation);
            popupWindow.showAtLocation(findViewById(R.id.btn_show), Gravity.NO_GRAVITY, 0, 0);
            popupWindow.setFocusable(true);
            popupWindow.update();
            flag =true;
        } else {
            popupWindow.dismiss();
            popupWindow.setFocusable(false);
            flag =false;
        }
    }
}


布局文件main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/layout"
    >
    <Button
        android:id="@+id/btn_show"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="show"
        />
</RelativeLayout>

布局文件popup.xml
<?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"
    android:background="#cccccc" 
    > 
    <Button 
        android:id="@+id/btn_dismiss"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="dismiss"/>
</LinearLayout>




注意看在res文件夹下面新建了一个anim文件夹,里面要实现的动画页面,比如从哪个坐标移动到哪个坐标之类的,当然还可以定义其它的,这里只实现了Y坐标的移动

在anim文件夹下面建两个文件,一个是in.xml,另外一个是out.xml,意思一看就明白
in.xml
<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/decelerate_interpolator">
    <translate 
        android:fromYDelta="854" 
        android:toYDelta="0"
        android:duration="1000"/>
</set>

它表示Y的坐标从854(因为我的手机分辨率是850x480,摩托MB525)移动到0,时间为1秒
out.xml
<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">  
    <translate android:interpolator="@android:anim/decelerate_interpolator"
        android:fromYDelta="0"
        android:toYDelta="854" 
        android:duration="10000"
    />
</set>

有人给我反应说缺少style文件,我看了一下,确实是,当时发贴的时候漏掉了,现在补上

在values文件夹下面建一个styles.xml文件
<?xml version="1.0" encoding="utf-8"?>
<resources>
     <style name="PopupAnimation" parent="android:Animation" mce_bogus="1">      
         <item name="android:windowEnterAnimation">@anim/in</item>  
        <item name="android:windowExitAnimation">@anim/out</item>  
    </style>
</resources>

本文转自:http://www.cnblogs.com/and_he/archive/2011/08/12/2136107.html
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