popwindow+listview

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实现下拉菜单，spinner一般也能够实现，但自定义比较麻烦，比如spinner有默认值时，还得动态添加spinner默认值，而用popwindow+listview也能实现相同的效果，并且自定义比较简单。

这里写图片描述

<?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"    tools:context="com.example.spinner.MainActivity">    <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" /></LinearLayout>

popwindow填充的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>

listview每个item代码

<?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>

package com.example.spinner;import android.graphics.drawable.BitmapDrawable;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;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 java.util.ArrayList;import static com.example.spinner.R.layout.listview;public class MainActivity extends AppCompatActivity {    private Button button;    private ArrayList list = new ArrayList();    private ListView listView;    private MyAdapter adapter;    private  boolean isShow;    private PopupWindow popupWindow;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.button);        initDate();        initPop();        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                if(popupWindow.isShowing()){                    popupWindow.dismiss();                }else{                    popupWindow.showAsDropDown(button);                }            }        });       listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {           @Override           public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {               button.setText(list.get(i)+"");           }       });    }    private void initPop() {        View view= LayoutInflater.from(this).inflate(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);    }    private void initDate() {        list.add("0");        list.add("1");        list.add("2");    }}

package com.example.spinner;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;/** * Created by Administrator on 2017/1/1. */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;    }}

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