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*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

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

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!

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