简单的popupWindow的demo

MainActivity：

package tech.androidstudio.popupwindowsimpledemo;

import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener {

    private ListView mListView;
    private ArrayList<SubItem> subItems;

    //首先是创建一个listView ，这里面的内容是包含了一个listView的类的列表
    //然后给这个添加popupwindow，在onItemClick的回调里面。

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mListView = (ListView)findViewById(R.id.listView);
        subItems = new ArrayList<SubItem>();
        for (int i = 0; i < 5; i++) {
            ArrayList<String> data = new ArrayList<String>();
            for (int j = 0; j < 6; j++) {
                data.add(new String(i+"子项目"+j));
            }
            SubItem subItem = new SubItem("主项目"+i,data);
            subItems.add(subItem);
        }

        SubItemAdapter adapter = new SubItemAdapter(subItems);

        mListView.setAdapter(adapter);

        mListView.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        PopupWindow popupWindow = new PopupWindow(this);

        //代码创建一个subListView
        ListView subListView = new ListView(this);
        subListView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT));
        ArrayList<String> subList= new ArrayList<String>();
        subList=subItems.get(position).getSubList();

        ArrayAdapter<String> subAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,subList);

        subListView.setAdapter(subAdapter);

        //这步很重要
        popupWindow.setContentView(subListView);
        //设置这个宽度和高度和上一保持一直
        popupWindow.setHeight(view.getHeight());
        popupWindow.setWidth(view.getWidth());

        popupWindow.setTouchable(true);
        popupWindow.setOutsideTouchable(true);
        popupWindow.setFocusable(true);

        //通过getLocationOnScreen来获取view在屏幕中的位置
        int[] location = new int[2];
        view.getLocationOnScreen(location);
        //上方：popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0], location[1]-popupWindow.getHeight());
        //左边：popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]-popupWindow.getWidth(), location[1]);
        //右边： popupWindow.showAtLocation(mListView, Gravity.NO_GRAVITY,width,location[1]);
        popupWindow.showAtLocation(view, Gravity.NO_GRAVITY,location[0]+view.getWidth(),location[1]);
    }

    public class SubItem{
        private String name;
        private ArrayList<String> subList;

        public SubItem(String name, ArrayList<String> subList) {
            this.name = name;
            this.subList = subList;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public ArrayList<String> getSubList() {
            return subList;
        }

        public void setSubList(ArrayList<String> subList) {
            this.subList = subList;
        }
    }

    public class SubItemAdapter extends BaseAdapter {

        ArrayList<SubItem> subItems = new ArrayList<SubItem>();

        public SubItemAdapter(ArrayList<SubItem> subItems) {
            this.subItems = subItems;
        }

        @Override
        public int getCount() {
            return subItems.size();
        }

        @Override
        public Object getItem(int position) {
            return subItems.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View ret = LayoutInflater.from(getApplicationContext()).inflate(R.layout.item_listview, parent, false);
            TextView tv = (TextView)ret.findViewById(R.id.text1);
            tv.setText(subItems.get(position).getName());
            return ret;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <ListView android:text="Hello World!" android:layout_width="158dp"
        android:layout_height="wrap_content"
        android:id="@+id/listView"/>
</RelativeLayout>

item_listview.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="wrap_content"
    android:layout_height="wrap_content">
<TextView
    android:layout_width="158dp"
    android:layout_height="50dp"
    android:id="@+id/text1"/>
</LinearLayout>

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