我的Android进阶之旅------>Android用PopupWindow实现弹出菜单实例

step1:新建项目PopWindow,并导入菜单项使用的图片到/res/drawable目录下

（项目总览图） （drawable目录截图）

step2:设置应用的UI界面

a.应用的总体界面，main.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:id="@+id/main"
    >
<Button  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/button"
    android:onClick="openPopWindow"
    />
</LinearLayout>

b.弹出菜单的界面，popwindow.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="@drawable/rectangle">  <!-- 设置一个手绘的长方形背景 -->
	<GridView android:layout_width="fill_parent"
		android:layout_height="wrap_content" android:numColumns="4"
		android:horizontalSpacing="10dp" android:verticalSpacing="10dp"
		android:id="@+id/gridView" />
</LinearLayout>

其中的android:background="@drawable/rectangle"是引用rectangle.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
	android:shape="rectangle">
	<gradient android:startColor="#1DC9CD" android:endColor="#A2E0FB"
		android:angle="270" />
	<padding android:left="2dp" android:top="2dp" android:right="2dp"
		android:bottom="2dp" />
</shape>

c.每个菜单项的界面，grid_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
    android:gravity="center"
    >
    <ImageView 
         android:layout_width="wrap_content"
   		 android:layout_height="wrap_content"
         android:id="@+id/imageView"
        />
	<TextView 
	    android:layout_width="fill_parent"
   		android:layout_height="wrap_content"
   		android:gravity="center"
   		android:textSize="16sp"
   		android:textColor="#000099"
        android:id="@+id/textView"
	    />
</LinearLayout>

d:为菜单设置一个style，用于指定菜单弹出时和退出时的动画效果 styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="animation">
        <item name="android:windowEnterAnimation">@anim/enter</item>
	 <item name="android:windowExitAnimation">@anim/exit</item> 
    </style>
</resources>

其中enter.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
 	<translate
        android:fromYDelta="100%p"
        android:toYDelta="0" 
        android:duration="500"
        />
 	<alpha
        android:fromAlpha="0.7"
        android:toAlpha="1.0" 
        android:duration="300"
        /> 	
</set>

exit.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:shareInterpolator="false">
 	<translate
        android:fromYDelta="0"
        android:toYDelta="100%p" 
        android:duration="2000"
        />
 	<alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.5" 
        android:duration="1000"
        /> 	
</set>

step3:MainActivity.java

package cn.roco.popwindow;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.GridView;
import android.widget.ListAdapter;
import android.widget.PopupWindow;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {
	private PopupWindow popupWindow;
	private View parent;
	/**菜单弹出来时候的菜单项图案*/
	private int[] images = { R.drawable.i1, R.drawable.i2, R.drawable.i3,
			R.drawable.i4, R.drawable.i5, R.drawable.i6, R.drawable.i7,
			R.drawable.i8 };
	/**菜单弹出来时候的菜单项文字*/
	private String[] names = { "搜索", "文件管理", "下载管理", "全屏", "网址", "书签", "加入书签",
			"分享页面" };

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		/**PopupWindow的界面*/
		View contentView = getLayoutInflater()
				.inflate(R.layout.popwindow, null);
		/**网格布局界面*/
		GridView gridView = (GridView) contentView.findViewById(R.id.gridView);
		/**设置网格布局的适配器*/
		gridView.setAdapter(getAdapter());
		/**设置网格布局的菜单项点击时候的Listener*/
		gridView.setOnItemClickListener(new ItemClickListener());
		/**初始化PopupWindow*/
		popupWindow = new PopupWindow(contentView,
				ViewGroup.LayoutParams.MATCH_PARENT,
				ViewGroup.LayoutParams.WRAP_CONTENT);
		popupWindow.setFocusable(true);// 取得焦点
		popupWindow.setBackgroundDrawable(new BitmapDrawable());
		/**设置PopupWindow弹出和退出时候的动画效果*/
		popupWindow.setAnimationStyle(R.style.animation);
		
		parent = this.findViewById(R.id.main);
	}
	
	private final class ItemClickListener implements OnItemClickListener{
		@Override
		public void onItemClick(AdapterView<?> parent, View view, int position,
				long id) {
			if (popupWindow.isShowing()) {
				popupWindow.dismiss();//关闭
			}
		}
	}
	
	/**返回网格布局的适配器*/
	private ListAdapter getAdapter() {
		List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
		for (int i = 0; i < images.length; i++) {
			HashMap<String, Object> item = new HashMap<String, Object>();
			item.put("image", images[i]);
			item.put("name", names[i]);
			data.add(item);
		}
		SimpleAdapter simpleAdapter = new SimpleAdapter(this, data,
				R.layout.grid_item, new String[] { "image", "name" },
				new int[] { R.id.imageView, R.id.textView });
		return simpleAdapter;
	}

	public void openPopWindow(View v) {
		/**设置PopupWindow弹出后的位置*/
		popupWindow.showAtLocation(parent, Gravity.BOTTOM, 0, 0);
	}
}

step4:AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="cn.roco.popwindow"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".MainActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
</manifest>

step5:运行效果

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作者：欧阳鹏 欢迎转载，与人分享是进步的源泉！

转载请保留原文地址：http://blog.csdn.net/ouyang_peng

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