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

    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,P opupWindow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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  • 原文地址:https://www.cnblogs.com/dyllove98/p/3143188.html
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