自定义控件（下拉选择框）

一，activity

package com.example.downPushSelect;

import java.util.ArrayList;

import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

public class MainActivity extends Activity {

	private EditText et_input;
	private ImageButton ib_down_arrow;
	private ArrayList<String> dataList;
	private ListView listView;
	private myAdapter myAdapter;
	private PopupWindow popupWindow;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initUI();
		initClick();
	}

	/**
	 * 初始化显示数据
	 */
	private void initData() {

		// 存放显示的数据
		dataList = new ArrayList<String>();

		String message = null;
		// 给message循环赋值，并加入dataList集合
		for (int i = 0; i < 40; i++) {
			message = "10086" + i;
			dataList.add(message);
		}

	}

	/**
	 * 点击事件
	 */
	private void initClick() {
		// 点击下拉框，展示popupwindow
		ib_down_arrow.setOnClickListener(new OnClickListener() {

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

	/**
	 * 展示popwindow
	 */
	protected void showPopupWindow() {
		// 创建好listview，并设置适配器
		createListView();
		popupWindow = new PopupWindow(listView, et_input.getWidth(), 300);
		// 单击别处可使popwindow关闭
		popupWindow.setOutsideTouchable(true);
		// 获取焦点
		popupWindow.setFocusable(true);
		popupWindow.setBackgroundDrawable(new BitmapDrawable());
		popupWindow.showAsDropDown(et_input, 0, -5);
	}

	/**
	 * 创建listview
	 */
	private void createListView() {
		// 创建ListView
		listView = new ListView(this);
		listView.setBackgroundResource(R.drawable.listview_background);
		initData();

		// 填充适配器
		myAdapter = new myAdapter();
		listView.setAdapter(myAdapter);

		// 设置点击事件
		listView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				String string = dataList.get(position);
				et_input.setText(string);
				popupWindow.dismiss();
			}
		});
	}

	private class ViewHolder {
		public TextView des;
		public ImageButton del;
	}

	/**
	 * 找到控件
	 */
	private void initUI() {
		et_input = (EditText) findViewById(R.id.et_input);
		ib_down_arrow = (ImageButton) findViewById(R.id.ib_down_arrow);
	}

	private class myAdapter extends BaseAdapter {

		@Override
		public View getView(final int position, View convertView,
				ViewGroup parent) {
			// 复用convertView
			ViewHolder vh = null;
			if (convertView == null) {
				convertView = View.inflate(getApplicationContext(),
						R.layout.item_user_message, null);
				vh = new ViewHolder();
				vh.des = (TextView) convertView.findViewById(R.id.tv_des);
				vh.del = (ImageButton) convertView.findViewById(R.id.ib_del);
				convertView.setTag(vh);
			} else {
				vh = (ViewHolder) convertView.getTag();
			}
			// 设置条目信息
			String str = getItem(position);
			vh.des.setText(str);
			// 设置点击事件
			vh.del.setOnClickListener(new OnClickListener() {

				public void onClick(View v) {
					dataList.remove(position);
					notifyDataSetChanged();
					if (dataList.size() == 0) {
						popupWindow.dismiss();
					}
				}
			});
			return convertView;
		}

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

		@Override
		public String getItem(int position) {
			return dataList.get(position);
		}

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

	}
}

2.布局文件

activity_main.xml

<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"
    tools:context="${relativePackage}.${activityClass}" >

    <RelativeLayout
        android:layout_width="200dp"
        android:layout_height="35dp" >

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

        <ImageButton
            android:id="@+id/ib_down_arrow"
            android:layout_width="wrap_content"
            android:layout_height="fill_parent"
            android:layout_alignParentRight="true"
            android:background="@null"
            android:src="@drawable/down_arrow" />
    </RelativeLayout>

</RelativeLayout>

item_user_message.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:descendantFocusability="blocksDescendants"
    android:gravity="center_vertical"
    android:orientation="horizontal" >

    <ImageView
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:src="@drawable/user" />

    <TextView
        android:id="@+id/tv_des"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="1008611"
        android:textColor="#000"
        android:textSize="18sp" />

    <ImageButton
        android:id="@+id/ib_del"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:background="@null"
        android:src="@drawable/delete" />

</LinearLayout>

ps:item最外层要设置这个，要不条目没法点击    

      android:descendantFocusability="blocksDescendants"