(简单好用！)popupWindow+listView实现下拉列表的功能

有个需求：一有数据就显示列表提示，让用户选择是哪个数据。由于spinner定制性差，所以选择popupWindow+listView实现

package com.blzt.test;

import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

import java.util.ArrayList;

public class PopupwindowActivity extends Activity {
    private Button button;
    private ArrayList list = new ArrayList();
    private ListView listView;
    private MyAdapter adapter;
    private  boolean isShow;
    private PopupWindow popupWindow;
    private TextView mPopupTv;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_popupwindow);
        button = (Button) findViewById(R.id.button);
        mPopupTv = (TextView) findViewById(R.id.popup_tv);
        initDate();
        initPop();
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(popupWindow.isShowing()){
                    popupWindow.dismiss();
                }else{
//                    控制popupwindow显示的位置，在textiew下面
                    popupWindow.showAsDropDown(mPopupTv);
                }
            }
        });
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView adapterView, View view, int i, long l) {
//                button.setText(list.get(i)+"");
                mPopupTv.setText(list.get(i)+"");
                popupWindow.dismiss();
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
//        popupWindow.showAsDropDown(button);
    }

    private void initPop() {
        View view= LayoutInflater.from(this).inflate(R.layout.listview,null);
        adapter=new MyAdapter(this,list);
        listView= (ListView) view.findViewById(R.id.listView);
        listView.setAdapter(adapter);
        popupWindow =new PopupWindow(view,
                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);
        popupWindow.setOutsideTouchable(true);
        popupWindow.setBackgroundDrawable(new BitmapDrawable());
        popupWindow.setFocusable(true);
        popupWindow.setContentView(view);
//        popupWindow.showAtLocation(view, Gravity.LEFT,0,0);
    }
    private void initDate() {
        list.add("0");
        list.add("1");
        list.add("2");
    }

}

package com.blzt.test;

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

import java.util.ArrayList;

public class MyAdapter extends BaseAdapter {

    private Context context;
    private ArrayList list;
    public MyAdapter(Context context,ArrayList list){
        this.context=context;
        this.list=list;
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup viewGroup) {
        ViewHolder vh;
        if (convertView == null) {
            vh = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(R.layout.item, null);
            vh.textview = (TextView) convertView.findViewById(R.id.tv_text);
            convertView.setTag(vh);
        } else {
            vh = (ViewHolder) convertView.getTag();
        }
        vh.textview.setText(list.get(position) + "");
        return convertView;
    }
    static class ViewHolder {
        TextView textview;
    }
}

activity_popupwindow

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    >

    <Button
        android:id="@+id/button"
        android:layout_width="80dp"
        android:layout_height="40dp"
        android:background="#10000000"
        android:gravity="center_vertical"
        android:text="选择状态" />
    <TextView
        android:id="@+id/popup_tv"
        android:text="@string/add"
        android:layout_width="200dp"
        android:layout_height="200dp"/>

</LinearLayout>

item

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:background="#10000000"
        android:id="@+id/tv_text"
        android:layout_width="match_parent"
        android:layout_height="30dp" />
</LinearLayout>

listview

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <ListView
        android:background="#10000000"
        android:id="@+id/listView"
        android:layout_width="80dp"
        android:layout_height="wrap_content">
    </ListView>
</LinearLayout>