自定义下拉选择框 PopupWindow

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                      自定义下拉选择框 PopupWindow

直接上代码:activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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="com.hz.popupwindow.MainActivity">

    <RelativeLayout
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true">

        <EditText
            android:id="@+id/et_input"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <ImageButton
            android:id="@+id/ib_dropdown"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_alignBottom="@id/et_input"
            android:background="@null"
            android:padding="5dp"
            android:src="@drawable/down_arrow" />
    </RelativeLayout>

</RelativeLayout>

MainActivity.java

package com.hz.popupwindow;

import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

public class MainActivity extends Activity implements View.OnClickListener , AdapterView.OnItemClickListener {
    private EditText etInput;
    private ImageButton ibDropdown;
    private ListView listView;
    private PopupWindow popupWindow;
    private ArrayList<String> datas;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        /*初始化页面*/
        initView();
    }

    private void initView() {
        etInput = (EditText) findViewById(R.id.et_input);
        ibDropdown = (ImageButton) findViewById(R.id.ib_dropdown);
        ibDropdown.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        showPopupWindow();
    }

    private void showPopupWindow() {
        initListView();
        popupWindow = new PopupWindow(listView, etInput.getWidth(),1000);
        // 设置点击外部区域, 自动隐藏
        popupWindow.setOutsideTouchable(true); // 外部可触摸
        popupWindow.setBackgroundDrawable(new BitmapDrawable()); // 设置空的背景, 响应点击事件

        popupWindow.setFocusable(true); //设置可获取焦点

        // 显示在指定控件下
        popupWindow.showAsDropDown(etInput,0,-5);
    }

    /**
     * 初始化要显示的listView
     */
    private void initListView() {
        listView = new ListView(this);
        listView.setDividerHeight(0);
        listView.setBackgroundResource(R.drawable.listview_background);
        listView.setOnItemClickListener(this);

        datas = new ArrayList<String>();
        // 创建一些数据
        for (int i = 0; i < 30; i++) {
            datas.add((10000 + i) + "");
        }

        listView.setAdapter(new MyAdapter());
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String string = datas.get(position);
        etInput.setText(string); // 设置文本

        popupWindow.dismiss(); // 消失了
    }

    class MyAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            return datas.size();
        }

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

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

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            View  view ;
            if (convertView==null){
                view=View.inflate(MainActivity.this,R.layout.item_number,null);
            }else {
                view=convertView;
            }
            TextView tv_number = (TextView) view.findViewById(R.id.tv_number);
            tv_number.setText(datas.get(position));

            view.findViewById(R.id.ib_delete).setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    datas.remove(position);
                    notifyDataSetChanged();

                    if(datas.size() == 0){
                        // 如果删除的是最后一条, 隐藏popupwindow
                        popupWindow.dismiss();
                    }
                }
            });
            return view;
        }
    }
}

item_nuamber.xml

<?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:padding="3dp"
    android:descendantFocusability="blocksDescendants"
    android:gravity="center_vertical"
    android:orientation="horizontal" >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/user" />

    <TextView
        android:id="@+id/tv_number"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_marginLeft="10dp"
        android:text="12306" />

    <ImageButton
        android:id="@+id/ib_delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:background="@null"
        android:src="@drawable/delete" />

</LinearLayout>