自定义控件---系统控件组合式(案例三)

效果图如下

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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=".MainActivity" >

    <EditText
        android:id="@+id/editText1"
        android:layout_width="200dip"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:hint="请输入文本"
        android:singleLine="true" />

    <ImageView
        android:id="@+id/iv_down_arrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/editText1"
        android:layout_alignRight="@+id/editText1"
        android:src="@drawable/down_arrow" />

</RelativeLayout>

popupwindow_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:padding="5dip"
        android:src="@drawable/user" />

    <TextView
        android:id="@+id/tv_msg"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="aaaaaaaa0"
        android:textColor="#000000"
        android:textSize="18sp" />

    <ImageView
        android:id="@+id/iv_delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:padding="10dip"
        android:src="@drawable/delete" />

</RelativeLayout>

MainActivity.java

package com.atguigu.downarrow;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

public class MainActivity extends Activity {

	private EditText editText1;
	private ImageView iv_down_arrow;

	private PopupWindow window;

	//自定义listView
	private ListView listView;
	//数据
	private ArrayList<String> msgs;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		editText1 = (EditText) findViewById(R.id.editText1);
		iv_down_arrow = (ImageView) findViewById(R.id.iv_down_arrow);

		//设置点击事件-弹出popuwindow
		iv_down_arrow.setOnClickListener(mClickListener);

		//准备数据
		msgs = new ArrayList<String>();
		for(int i =0;i<200;i++){
			msgs.add("aaaaaaaaaaa"+i);
		}

		//实例化ListView
		listView = new ListView(this);
		//9Patch图片
		listView.setBackgroundResource(R.drawable.listview_background);
		//创建并且设置适配器
		MyAdaper adapter = new MyAdaper();
		listView.setAdapter(adapter);
		//设置点击某一条
		listView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				//1.得到内容
				String msg = msgs.get(position);
				//2.设置到输入框里面
				editText1.setText(msg);
				//如果试图不为空，并且试图处于显示状态
				if(window!= null&&window.isShowing()){
					window.dismiss();
					//释放资源
					window = null;
				}
			}
		});

	}
	private OnClickListener mClickListener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			switch (v.getId()) {
			case R.id.iv_down_arrow://向下箭头

				if(window == null){
					window = new PopupWindow(MainActivity.this);
					window.setWidth(editText1.getWidth());
					window.setHeight(200);
					//TODO ListView还没有创建，一会要来继续接着这个地方写代码
					window.setContentView(listView);
					//设置焦点
					window.setFocusable(true);

				}

				window.showAsDropDown(editText1, 0, 0);

				break;

			default:
				break;
			}

		}
	};

	/**
	 * 创建适配器
	 */
	class MyAdaper extends BaseAdapter{

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

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

		@Override
		public long getItemId(int position) {
			return 0;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			//最终返回一个view
			View view;
			ViewHolder holder;
			if(convertView != null){
				view = convertView;
				holder = (ViewHolder) view.getTag();
			}else{
				//把布局文件--->View对象
				view = View.inflate(MainActivity.this, R.layout.popupwindow_item, null);
				holder = new ViewHolder();
				holder.tv_msg = (TextView) view.findViewById(R.id.tv_msg);
				holder.iv_delete = (ImageView) view.findViewById(R.id.iv_delete);

				//关联起来
				view.setTag(holder);
			}

			//根据位置得到对应的数据
			final String msg = msgs.get(position);
			holder.tv_msg.setText(msg);

			holder.iv_delete.setOnClickListener(new OnClickListener() {

				@Override
				public void onClick(View v) {
					//1.从列表中清除
					msgs.remove(msg);

					//2.刷新显示
					notifyDataSetChanged();

				}
			});

			return view;
		}

	}

	static class ViewHolder{
		TextView tv_msg;
		ImageView iv_delete;
	}
}