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PopupWindow选项弹窗

2024-10-21 05:53:39   211人阅读

PopupWindow选项弹窗

一、popupwindow弹窗简介

popupwindow是一种弹窗在应用中经常使用,像超级课程表的周数选择，微博的标题栏的titlebar中的选择等等 ，如图所示。
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但是和alertDialog很相似，但是还是有很大的区别的。AlterDialog是非阻塞式对话框：AlaterDialog弹出时，后台还可以做事情；而且PopuWindow是阻塞式对话框：PopupWindow弹出时，后台程序会等待，在PopupWindow退出之前一直处于等待，直到当我们调用了dismiss方法之后，PopuWindow退出了，程序才会向下执行。

二、PopupWindow的使用

    1、构造一个PopupWindow对象。PopupWindow pop = new PopupWindow(view,300, 250);
     View是加载的布局文件View view = layoutInflater.inflate(R.layout.grou_list, null);
     X,Y是PopupWindow弹窗的长和宽
    2、调用showAsDropDown (View anchor, int xoff, int yoff)方法.
       View是点击弹出PopupWindow的View    x,y是设定PopupWindow弹出的位置
       也可以使用 showAtLocation (View parent, int gravity, int x, int y)方法设置弹出的位置。
    3、Dismiss（）方法设置PopupWindow的消失。
    4、还有几个常用的设置方法。
       setFocusable(true)设置使PopupWindow聚焦
       setOutsideTouchable(true)设置允许点击外部的地方消失
       setBackgroundDrawable(new BitmapDrawable())设置点击返回键也能使其消失。

三、例子实现

MainActivity.java

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public class MainActivity extends Activity {
    private TextView tv_pop;
    private ListView group_list;
    private TextView tv_group_item;
    private View view;
    private PopupWindow pop;
    private List<String> list;
 
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
        setContentView(R.layout.activity_main);
        getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.title);
 
        tv_pop = (TextView) findViewById(R.id.tv_pop);
        tv_group_item = (TextView) findViewById(R.id.tv_group_item);
        tv_pop.setText("学期");
        tv_pop.setOnClickListener(new View.OnClickListener() {
 
            public void onClick(View v) {
                showWindow(v);
            }
        });
    }
 
    protected void showWindow(View v) {
        if (pop == null) {
             
            LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            //将listView的布局文件加载到View中
            view = layoutInflater.inflate(R.layout.grou_list, null);
            group_list=(ListView) view.findViewById(R.id.group_list);
            //List数组
            list = new ArrayList<String>();
            list.add("2012-2013学年第1学期");
            list.add("2012-2013学年第2学期");
            list.add("2013-2014学年第1学期");
            list.add("2013-2014学年第2学期");
            GroupAdapter groupAdapter = new GroupAdapter(this, list);
            group_list.setAdapter(groupAdapter);
            //
            pop = new PopupWindow(view,300, 250);
        }
        // 使其得到聚焦
        pop.setFocusable(true);
        // 设置允许点击外部的地方消失
        pop.setOutsideTouchable(true);
        // 设置点击返回键也能使其消失，并且不会影响你的背景
        pop.setBackgroundDrawable(new BitmapDrawable());
        //获取屏幕的宽度，计算弹窗弹出位置的x坐标
        WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        int xPos = windowManager.getDefaultDisplay().getWidth() / 2
                - pop.getWidth() / 2;
        //设置弹窗弹出的位置
        pop.showAsDropDown(v, -100,0);
//      pop.showAtLocation(v, Gravity.TOP, 0,45);
         
        //设置List点击后的点击事件
        group_list.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> adapterView, View viewe,
                    int position, long id) {
                Toast.makeText(MainActivity.this, list.get(position),
                        Toast.LENGTH_SHORT).show();
                if (pop != null) {
                    pop.dismiss();
 
                }
            }
        });
 
    }
 
}


GroupAdapter:

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public class GroupAdapter extends BaseAdapter {
    private Context context;
    private List<String> list;
 
    public GroupAdapter(Context context, List<String> list) {
        this.context = context;
        this.list = list;
 
    }
 
    public int getCount() {
        return list.size();
    }
 
    public Object getItem(int position) {
        return list.get(position);
    }
 
    public long getItemId(int position) {
        return position;
    }
 
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(
                    R.layout.group_item, null);
            holder = new ViewHolder();
            convertView.setTag(holder);
            holder.groupItem = (TextView) convertView
                    .findViewById(R.id.tv_group_item);
 
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.groupItem.setText(list.get(position));
        return convertView;
    }
 
    static class ViewHolder {
        TextView groupItem;
    }
}


activity_main.xml

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="500dp"
    android:background="#D2D2D5"
    android:orientation="vertical" >
 
    <Button
        android:id="@+id/bb"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="button" />
 
</LinearLayout>

title.xml

自定义标题栏的标题栏的布局文件

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#E1E6F6" >
 
    <TextView
        android:id="@+id/tv_pop"
        android:layout_width="wrap_content"
        android:layout_height="45dip"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:gravity="center"
        android:text="学期"
        android:textSize="23dp" />
 
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="44dip"
        android:src="@drawable/title_right" />
 
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="fill_parent"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:src="@drawable/title_left" />
 
</RelativeLayout>

group_list.xml

弹窗中的listview的布局文件

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<?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:paddingLeft="0.0sp"
    android:paddingRight="0.0sp"
    android:layout_margin="0.0px"
    android:background="@drawable/group_bg"
     >
    <ListView
        android:id="@+id/group_list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:drawSelectorOnTop="true"
        android:cacheColorHint="#00000000"
        android:dividerHeight="2.0px"
        ></ListView>
 
</LinearLayout>

group_item.xml

设置弹窗中ListView中加载的控件textview

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<?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" >
 
    <TextView
        android:id="@+id/tv_group_item"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center"
         />
 
</LinearLayout>

效果图：

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PopupWindow选项弹窗


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