安卓--ListView

实验目的：

学习使用ListView

实验要求：

实现一个列表，其中显示班级学号姓名，提供添加功能，如需要删去某一项，长按该项，通过弹出菜单显示删除功能。

 package com.flyuz.app3;

 import android.support.v7.app.AppCompatActivity;

 import android.os.Bundle;

 import android.view.View;

 import android.view.MenuItem ;

 import android.widget.Button;

 import android.widget.ListView;

 import android.widget.ArrayAdapter;

 import android.widget.EditText;

 import android.widget.PopupMenu;

 import android.widget.AdapterView;

 import java.util.List;

 import java.util.ArrayList;

 public class MainActivity extends AppCompatActivity {

     private Button bt_add;

     private ListView lv;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         init();

     }

     private void init() {

         bt_add = (Button) findViewById(R.id.bt_add);

         lv = (ListView) findViewById(R.id.lv);

         List<String> list = new ArrayList<String>();

         list.add("班级" + "                    " + "学号" + "                    " + "姓名");

         list.add("se1" + "             " + "2016012884" + "                 " + "张三");

         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, list);

         lv.setAdapter(adapter);

         //设置事件

         bt_add.setOnClickListener(new View.OnClickListener() {

             public void onClick(View v) {

                 EditText et_class = (EditText) findViewById(R.id.et_class);

                 EditText et_number = (EditText) findViewById(R.id.et_number);

                 EditText et_name = (EditText) findViewById(R.id.et_name);

                 String str_class = et_class.getText().toString();

                 String str_number = et_number.getText().toString();

                 String str_name = et_name.getText().toString();

                 ArrayAdapter add_adp = (ArrayAdapter) lv.getAdapter();

                 add_adp.add(str_class + "             " + str_number + "             " + str_name);

             }

         });

         lv.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

             @Override

             public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {

                 if (id > 0) {

                     PopupMenu popup = new PopupMenu(MainActivity.this, view);

                     popup.getMenuInflater().inflate(R.menu.menu, popup.getMenu());

                     popup.show();

                     popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {

                         @Override

                         public boolean onMenuItemClick(MenuItem item) {

                             switch (item.getItemId()) {

                                 case R.id.menu_del:

                                     ArrayAdapter temp_adp = (ArrayAdapter) lv.getAdapter();

                                     temp_adp.remove(temp_adp.getItem(position));

                                     return true;

                                 default:

                                     return false;

                             }

                         }

                     });

                 }

                 return true;

             }

         });

     }

 }

MainActivity

 <?xml version="1.0" encoding="utf-8"?>

 <LinearLayout 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:orientation="vertical"

     tools:context="com.flyuz.app3.MainActivity">

     <LinearLayout

         android:layout_width="match_parent"

         android:layout_height="200dp"

         android:gravity="center"

         android:orientation="vertical">

         <LinearLayout

             android:layout_width="match_parent"

             android:layout_height="50dp"

             android:gravity="center"

             android:orientation="horizontal">

             <TextView

                 android:layout_width="50dp"

                 android:layout_height="40dp"

                 android:gravity="center"

                 android:text="班级:" />

             <EditText

                 android:id="@+id/et_class"

                 android:layout_width="150dp"

                 android:layout_height="40dp" />

         </LinearLayout>

         <LinearLayout

             android:layout_width="match_parent"

             android:layout_height="50dp"

             android:gravity="center"

             android:orientation="horizontal">

             <TextView

                 android:layout_width="50dp"

                 android:layout_height="40dp"

                 android:gravity="center"

                 android:text="学号:" />

             <EditText

                 android:id="@+id/et_number"

                 android:layout_width="150dp"

                 android:layout_height="40dp" />

         </LinearLayout>

         <LinearLayout

             android:layout_width="match_parent"

             android:layout_height="50dp"

             android:gravity="center"

             android:orientation="horizontal">

             <TextView

                 android:layout_width="50dp"

                 android:layout_height="40dp"

                 android:gravity="center"

                 android:text="姓名:" />

             <EditText

                 android:id="@+id/et_name"

                 android:layout_width="150dp"

                 android:layout_height="40dp" />

         </LinearLayout>

         <Button

             android:id="@+id/bt_add"

             android:layout_width="180dp"

             android:layout_height="40dp"

             android:text="添加" />

     </LinearLayout>

     <ListView

         android:id="@+id/lv"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:longClickable="true" />

 </LinearLayout>

layout\activity_main.xml

 <?xml version="1.0" encoding="utf-8"?>

 <menu xmlns:android="http://schemas.android.com/apk/res/android">

     <item

         android:id="@+id/menu_del"

         android:title="删除">

     </item>

 </menu>

menu\menu.xml

巴特西

安卓--ListView

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