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PopupWindow的使用以及ArrayAdatper.notifyDataSetChanged()无效详解

 
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Android的对话框有两种:PopupWindow和AlertDialog。它们的不同点在于:
AlertDialog的位置固定,而PopupWindow的位置可以随意

AlertDialog是非阻塞线程的,而PopupWindow是阻塞线程的

PopupWindow的位置按照有无偏移分,可以分为偏移和无偏移两种;按照参照物的不同,可以分为相对于某个控件(Anchor锚)和相对于父控件。具体如下
showAsDropDown(View anchor):相对某个控件的位置(正左下方),无偏移
showAsDropDown(View anchor, int xoff, int yoff):相对某个控件的位置,有偏移
showAtLocation(View parent, int gravity, int x, int y):相对于父控件的位置(例如正中央Gravity.CENTER,下方Gravity.BOTTOM等),可以设置偏移或无偏移

项目目录结构和效果图


1.PopupWindow的布局,里面只有一个ListView

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ListView
        android:id="@+id/popupwindow"
        android:background="@drawable/mm_title_functionframe"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:divider="@drawable/mm_title_functionframe_line"
        android:listSelector="@drawable/mm_title_functionframe_pressed"
        android:cacheColorHint="@android:color/transparent">
    </ListView>
</RelativeLayout>
2.PopupWindow item的布局,为了简单起里面只有一个TextView

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:padding="8.0dip" >

    <TextView
        android:id="@+id/popup_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textStyle="bold"
        android:singleLine="true"
        android:ellipsize="end"
        android:textColor="#ffffffff"/>

</RelativeLayout>
3.写一个PopupWindow的派生类,这里我直接贴代码,注释还是比较详细,只有用了一个回调接口,不明白回调函数的看这里http://blog.csdn.net/xiaanming/article/details/8703708

package com.example.popupwindow;

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

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.PopupWindow;

/**
 * 
 * @author xiaanming
 *
 */
public class MtitlePopupWindow extends PopupWindow {
	/**
	 * 上下文对象
	 */
	private Context mContext;
	/**
	 * 回调接口对象
	 */
	private OnPopupWindowClickListener listener;
	/**
	 * ArrayAdapter对象
	 */
	private ArrayAdapter adapter;
	/**
	 * ListView的数据源
	 */
	private List<String> list = new ArrayList<String>();
	/**
	 * PopupWindow的宽度
	 */
	private int width = 0;

	public MtitlePopupWindow(Context context){
		super(context); 
		mContext = context;
		initView();
	}
	
	private void initView(){
		LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		View popupView = inflater.inflate(R.layout.title_popupwindow, null);
		setContentView(popupView);
		
		//设置宽度,若没有设置宽度为LayoutParams.WRAP_CONTENT
		setWidth(250);  
		setHeight(LayoutParams.WRAP_CONTENT);
		
		//设置动画,也可以不设置。不设置则是显示默认的
		setAnimationStyle(R.style.popupwindow_animation);
		
		//这里很重要,不设置这个ListView得不到相应
		this.setFocusable(true);
	    this.setBackgroundDrawable(new BitmapDrawable()); 
	    this.setOutsideTouchable(true);
	    	
		ListView listView = (ListView) popupView.findViewById(R.id.popupwindow);
		adapter = new ArrayAdapter(mContext, R.layout.popupwindow_item, R.id.popup_item, list);
		listView.setAdapter(adapter);
		
		//ListView的点击事件
		listView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				MtitlePopupWindow.this.dismiss();
				if(listener != null){
					listener.onPopupWindowItemClick(position);
				}
			}
		});
		
	}
	
	/**
	 * 为PopupWindow设置回调接口
	 * @param listener
	 */
	public void setOnPopupWindowClickListener(OnPopupWindowClickListener listener){
		this.listener = listener;
	}
	

	/**
	 * 设置数据的方法,供外部调用
	 * @param mList
	 */
	public void changeData(List<String> mList) {
		//这里用addAll也很重要,如果用this.list = mList,调用notifyDataSetChanged()无效
		//notifyDataSetChanged()数据源发生改变的时候调用的,this.list = mList,list并没有发生改变
		list.addAll(mList);
		adapter.notifyDataSetChanged();
	}
	
	
	/**
	 * 回调接口.供外部调用
	 * @author xiaanming
	 *
	 */
	public interface OnPopupWindowClickListener{
		/**
		 * 当点击PopupWindow的ListView 的item的时候调用此方法,用回调方法的好处就是降低耦合性
		 * @param position 位置
		 */
		void onPopupWindowItemClick(int position);
	}


}

上面还用到了动画,比较简单的动画,不太懂动画请到这里http://blog.csdn.net/xiaanming/article/details/8997260

popupwindow_enter

<?xml version="1.0" encoding="UTF-8"?>  
<set xmlns:android="http://schemas.android.com/apk/res/android">  
    <translate   
        android:fromXDelta="100%p"  
        android:toXDelta="0"  
        android:duration="500"/>  
</set> 
popupwindow_exit

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate 
        android:fromXDelta="0"
        android:toXDelta="100%p"
        android:duration="500"/>
</set>
<resources>
    <style name="popupwindow_animation">
        <item name="android:windowEnterAnimation">@anim/popupwindow_enter</item>
        <item name="android:windowExitAnimation">@anim/popupwindow_exit</item>
    </style>

</resources>

这样子,以后我们遇到类似的popupwindow的就可以复用了,接下来我们看使用吧,使用很简单,布局里面一个Button,点击Button弹出一个PopupWindow,直接看代码吧

package com.example.popupwindow;

import java.util.Arrays;

import com.example.popupwindow.MtitlePopupWindow.OnPopupWindowClickListener;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class PopupActivity extends Activity {
	MtitlePopupWindow mtitlePopupWindow;
	String [] items = {"刷新列表", "修改密码", "系统设置", "添加用户", "关于"};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		
		Button mButton = (Button) findViewById(R.id.button1);
		mButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				mtitlePopupWindow.showAsDropDown(v);
			}
		});
		
		mtitlePopupWindow = new MtitlePopupWindow(this);
		mtitlePopupWindow.changeData(Arrays.asList(items));
		mtitlePopupWindow.setOnPopupWindowClickListener(new OnPopupWindowClickListener() {
			
			@Override
			public void onPopupWindowItemClick(int position) {
				//你要做的事
				Toast.makeText(getApplication(), items[position], Toast.LENGTH_SHORT).show();
			}
		});
	}


}
总体来说就是这样子,PopupWindow的使用还是挺简单的,这是小弟的一点拙见,写的不好的地方还请大神指出!

项目下载



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