一个自定义的PopupWindow的实例

最近由于项目中需要一个popupwindow的效果的可收放式的弹出框，根据自己的需要自己自定义了一个，觉得还不错所以拿出来分享给大家。先贴效果图：

1.首先我在清单文件中去掉了系统自带的titilebar，自定义了一个布局作为标题栏，让此app的主题继承没有actionbar的这个。

2.接下里自己重新布局一个你想要的标题栏，引入到你的MainActivity的布局文件中。这是toolbar_rollback.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="42dp"
    android:background="@color/colorAccent"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/rollback"
        android:layout_width="60dp"
        android:layout_height="match_parent"
        android:gravity="center"
        android:padding="4dp"
        android:text="返回"
        android:visibility="invisible"
        android:textColor="@color/white"
        android:textSize="12sp"/>

    <TextView
        android:id="@+id/title"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:textColor="@color/white"
        android:textSize="20sp" />

    <ImageView
        android:id="@+id/menu"
        android:layout_width="60dp"
        android:layout_height="match_parent"
        android:gravity="center"
        android:scaleType="centerInside"
        android:src="@drawable/ic_more"
        android:visibility="invisible" />
LinearLayout>

3.将其引入activity_main.xml文件中，activity_main如下：

.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="byd.com.byd.popupview.MainActivity">
    "@layout/toolbar_rollback" />
    "wrap_content"
        android:layout_height="wrap_content"
        android:text="你自己想要的布局"
        android:textSize="16sp"
        android:textColor="@color/colorPrimaryDark"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
.support.constraint.ConstraintLayout>

4.PopupView的定义与实现：

public class PopupView {
    private PopupWindow popupWindow;
    private Activity activity;
    private View contentView;
    //用来标记它的状态是弹出还是消失
    private boolean flag = false;
    public PopupView(Activity activity, View contentView) {
        this.activity = activity;
        this.contentView = contentView;
        init();
    }

    public boolean getFlag() {
        return flag;
    }

    /**
     * 初始化布局
     */
    private void init() {
        LinearLayout r = new LinearLayout(activity);
        r.setOrientation(LinearLayout.VERTICAL);
        Point point = new Point();
        activity.getWindowManager().getDefaultDisplay().getSize(point);
        LinearLayout.LayoutParams rl = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        rl.gravity = Gravity.RIGHT | Gravity.TOP;
        r.addView(contentView, rl);

        popupWindow = new PopupWindow(r, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

        ColorDrawable dw = new ColorDrawable(0xb0000000);
        //设置SelectPicPopupWindow弹出窗体的背景
        popupWindow.setBackgroundDrawable(dw);
        //设置弹出和消失的动画
        popupWindow.setAnimationStyle(R.style.PopupWindowAnimation);
        //设置焦点
        popupWindow.setFocusable(false);
        //设置是否外部可点击，true是可以点击
        popupWindow.setOutsideTouchable(true);
    }

    /**
     * 消失的方法
     */
    public void dismiss() {
        flag = false;
        if (popupWindow.isShowing()) {
            popupWindow.dismiss();
        }
    }

    /**
     * 展示的方法
     * @param v
     */
    public void show(View v) {
        flag = true;
        hideSoftInput();
        if (popupWindow.isShowing()) {
            return;
        }
        popupWindow.showAsDropDown(v, 0, 0);
    }

    /**
     * 隐藏软键盘
     */
    private void hideSoftInput() {
        InputMethodManager imm = (InputMethodManager) activity.getSystemService(Context.INPUT_METHOD_SERVICE);
        if (imm != null) {
            imm.hideSoftInputFromWindow(activity.getWindow().getDecorView().getWindowToken(), 0);
        }
    }

    /**
     * 设置弹出的位置
     * @param v
     */
    public void auto(View v) {
        if (popupWindow.isShowing()) {
            popupWindow.dismiss();
        } else {
            popupWindow.showAsDropDown(v, 0, 0);
        }
    }
}

5.PopupView的使用:

这里我对activity_main.xml中引入的tollbar_rollback.xml中的menu进行了监听，mPopupView是一个PopupView的全局对象，当mPopupView为null时，通过布局管理器LayoutInflater将布局动态加入：popup_view_item.xml如下：

"http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@color/white"
    android:divider="@drawable/divider"
    android:orientation="vertical"
    android:showDividers="middle">
    "@+id/expand_item_list"
        android:layout_width="128dp"
        android:layout_height="match_parent"
        android:background="@drawable/popup_bg"
        android:cacheColorHint="#00000000"
        android:listSelector="#00000000"
        android:divider="@color/divider"
        android:dividerHeight="@dimen/dp_1"/>
</LinearLayout>

很简单，他的布局只有一个ExpandableListView，他的数据我是通过自己来封装对象来完成，他用到的适配器adapter如下：ExpandableListAdapter.class

package byd.com.byd.popupview.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;
import byd.com.byd.popupview.R;
import byd.com.byd.popupview.myinterface.NotChildGroupListener;

/**
 * Created by byd666 on 2017/9/14.
 */

public class ExpandableListAdapter  extends BaseExpandableListAdapter {
    //组列表的数据
    private List groupArray;
    //子列表的数据
    private List> childArray;
    private Context mContext;
    private NotChildGroupListener listener;

    public void setNotChildGroupListener(NotChildGroupListener listener) {
        this.listener=listener;
    }

    public ExpandableListAdapter(Context context, List groupArray, List> childArray) {
        mContext = context;
        this.groupArray = groupArray;
        this.childArray = childArray;
    }

    @Override
    public int getGroupCount() {
        return groupArray != null ? groupArray.size() : 0;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return childArray != null ? childArray.get(groupPosition).size() : 0;
    }

    @Override
    public Object getGroup(int groupPosition) {
        return groupArray.get(groupPosition);
    }

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return childArray.get(groupPosition).get(childPosition);
    }

    @Override
    public long getGroupId(int groupPosition) {
        return groupPosition;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        return childPosition;
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        GroupHolder holder = null;
        if (convertView == null) {
            holder = new GroupHolder();
            convertView = LayoutInflater.from(mContext).inflate(R.layout.expandlist_group, null);
            holder.groupName = (TextView) convertView.findViewById(R.id.tv_group_name);
            holder.arrow = (ImageView) convertView.findViewById(R.id.iv_arrow);
            convertView.setTag(holder);
        } else {
            holder = (GroupHolder) convertView.getTag();
        }
        //当父item没有子item是关闭

        if (groupPosition==0|| groupPosition==4 || groupPosition == 5 || groupPosition==8) {
            holder.arrow.setVisibility(View.GONE);
            holder.groupName.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onNotChildGroupClick(groupPosition);
                }
            });
        }
        //判断是否已经打开列表
        if (isExpanded) {
            holder.arrow.setVisibility(View.VISIBLE);
        } else {
            holder.arrow.setVisibility(View.GONE);
        }
        holder.groupName.setText(groupArray.get(groupPosition));
        return convertView;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        ChildHolder holder = null;
        if (convertView == null) {
            holder = new ChildHolder();
            convertView = LayoutInflater.from(mContext).inflate(R.layout.expandlist_item, null);
            holder.childName = (TextView) convertView.findViewById(R.id.tv_child_name);
            convertView.setTag(holder);
        } else {
            holder = (ChildHolder) convertView.getTag();
        }
        holder.childName.setText(childArray.get(groupPosition).get(childPosition));
        return convertView;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

    class GroupHolder {
        public TextView groupName;
        public ImageView arrow;
    }

    class ChildHolder {
        public TextView childName;
    }
}

这里写代码片

ExpandUtils.class

package byd.com.byd.popupview.weiget;

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

/**
 * Created by byd666 on 2017/9/14.
 */

public class ExpandUtils {
    private static List groupArray;
    private static List> childArray;
    public ExpandUtils() {
        groupArray=new ArrayList<>();
        childArray =new ArrayList<>();
        initDate();
    }
    private void initDate()
    {
        addInfo("父item0", new String[]{});
        addInfo("父item1", new String[]{"item1_0","item1_1","item1_2","item1_3","item1_4","item1_5"});
        addInfo("父item2", new String[]{"item2_0","item2_1","item2_2"   });
        addInfo("父item3", new String[]{"item3_0","item3_1","item3_2","item3_3"});
        addInfo("父item4", new String[]{});
        addInfo("父item5", new String[]{});
        addInfo("父item6", new String[]{"item6_0","item6_1"});
        addInfo("父item7", new String[]{"item7_0","item7_1","item7_2"});
        addInfo("父item8", new String[]{});
    }
    private void addInfo(String group, String[] child) {
        groupArray.add(group);
        List childItem =new ArrayList<>();
        for(int index=0;indexpublic  List getGroupArray()
    {
        return groupArray;
    }
    public  List>  getChildArray()
    {
        return childArray;
    }
}

6.到这里基本上就已经快结束了，最后就是相应的监听事件以及列表打开或者关闭方面的事件处理，我这里是实现当打开下一个父item时，上一个父item自动关闭，于是有了下面一点处理，只需要设置监听setOnGroupExpandListener即可，实现onGroupExpand（int groupPosition）方法：

   @Override
    public void onGroupExpand(int groupPosition) {
        if(lastItem>0)
        {
            /*当有打开的记录位置后直接关闭
            ExpandableListView具体位置的列表，减少循环的次数*/
            mListView.collapseGroup(lastItem);
            lastItem = groupPosition;
        }else{
            int count = mListView.getExpandableListAdapter().getGroupCount();
            for(int j = 0; j < count; j++){
                if(j != groupPosition){
                    mListView.collapseGroup(j);
                }
            }
        }
    }

可能写的稍微有点乱。这里有demo的代码链接，大家可以下下来自己再看看。献丑了（苦笑。。。）点此跳转到clone位置