Android开发点击下拉列表按钮选择联系人

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private EditText editText;
    private ImageView iv_popup;
    private PopupWindow popupWindow;
    private ListView listView;
    private List<String> mList;
    private MyAdapter myAdapter;

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

        editText=findViewById(R.id.edit_text);
        iv_popup=findViewById(R.id.iv_pull_down);

        //造出适配listview的数据
        mList=new ArrayList<>();
        for (int i=0;i<50;i++){
            mList.add(i+"---10040391290---"+i);
        }

        //造出listView
        listView=new ListView(MainActivity.this);
        //设置ListView背景为白色。因为默认的背景色是黑色
        listView.setBackgroundResource(R.drawable.listview_background);
        //设置listView适配器
        myAdapter=new MyAdapter();
        listView.setAdapter(myAdapter);

        //设置下拉列表按钮点击事件
        iv_popup.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //下拉列表使用PopupWindows实现
                if (popupWindow==null){
                    popupWindow=new PopupWindow(MainActivity.this);
                    //设置popupWindow的宽和高
                    popupWindow.setWidth(editText.getWidth());
                    int heigh=DisplayUtil.dip2px(MainActivity.this,200);
                    popupWindow.setHeight(heigh);//设置高为200dp
                    //为popupWindow设置内容，这里设置其内容为ListView
                    popupWindow.setContentView(listView);
                    //设置焦点
                    popupWindow.setFocusable(true);
                }
                //把popWindow置于editText下面
                popupWindow.showAsDropDown(editText,0,0);
            }
        });

        //点击列表，把点击的数据设置到EditText
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //1,得到数据
                String msg=mList.get(position);
                //2,把这个数据设置到输入框中
                editText.setText(msg);
                //3,最后把popupWindows隐藏
                if (popupWindow!=null&&popupWindow.isShowing()){
                    popupWindow.dismiss();
                    //为了下次点击能正常弹出，这里需要把它设置为空
                    popupWindow=null;
                }
            }
        });
    }

    class MyAdapter extends BaseAdapter{

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

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

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

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder;
            if (convertView==null){
                convertView=View.inflate(MainActivity.this,R.layout.layout_item,null);
                viewHolder=new ViewHolder();
                viewHolder.textView=convertView.findViewById(R.id.text_view);
                viewHolder.tv_delete=convertView.findViewById(R.id.iv_delete);
                convertView.setTag(viewHolder);
            }else {
                viewHolder= (ViewHolder) convertView.getTag();
            }
            final String msg=mList.get(position);
            viewHolder.textView.setText(mList.get(position));
            //点击删除数据
            viewHolder.tv_delete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //1,把数据从列表中删除
                    mList.remove(position);
                    //2,刷新Ui
                    myAdapter.notifyDataSetChanged();
                }
            });
            return convertView;
        }
    }

    class ViewHolder{
        private TextView textView;
        private ImageView tv_delete;
    }
}

<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"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingBottom="16dp"
    android:paddingTop="16dp"
    android:orientation="horizontal"
    tools:context=".MainActivity">
    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingRight="40dp"
        android:ellipsize="end"
        android:singleLine="true"
        android:gravity="center_vertical"
        android:hint="请输入..."/>
    <ImageView
        android:id="@+id/iv_pull_down"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/edit_text"
        android:layout_alignRight="@+id/edit_text"
        android:src="@drawable/ic_pull_down"
        android:layout_marginLeft="10dp"
        android:padding="5dp"/>
</RelativeLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingLeft="10dp"
    android:paddingRight="10dp">
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="3dp"
        android:layout_gravity="center_vertical"
        android:src="@drawable/ic_user"
        />
    <TextView
        android:id="@+id/text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_gravity="center_vertical"
        android:gravity="center"
        android:padding="3dp"
        android:layout_margin="5dp"
        android:textColor="#000"
        android:textSize="14sp"
        android:text="中华人民共和国"
        />
    <ImageView
        android:id="@+id/iv_delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="3dp"
        android:layout_gravity="center_vertical"
        android:src="@drawable/ic_delect"
        />

</LinearLayout>