效果图如下
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activity_main.xml
<RelativeLayout xmlns:android=""xmlns:tools=""android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity" ><EditTextandroid: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" /><ImageViewandroid: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=""android:layout_width="match_parent"android:layout_height="wrap_content" ><ImageViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:padding="5dip"android:src="@drawable/user" /><TextViewandroid: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" /><ImageViewandroid: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.javapackage 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listViewprivate ListView listView;//数据private ArrayList<String> msgs;@Overrideprotected 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popuwindowiv_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() {@Overridepublic 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() {@Overridepublic 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{@Overridepublic int getCount() {return msgs.size();}@Overridepublic Object getItem(int position) {return msgs.get(position);}@Overridepublic long getItemId(int position) {return 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {//最终返回一个viewView 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() {@Overridepublic 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;}}
离开睁眼闭眼看见的城市，逃离身边的纷纷扰扰，
