实验三ListView

最新推荐文章于 2022-04-11 21:38:34 发布

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最新推荐文章于 2022-04-11 21:38:34 发布

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本文链接：https://blog.youkuaiyun.com/qq_39014426/article/details/80934153

本文通过MainActivity.java, activity_main.xml及menu_main.xml三个文件，详细介绍了如何在Android应用中实现和使用ListView，涵盖UI设计与后台逻辑配置。" 106847720,8765442,使用LayoutIt构建Bootstrap响应式布局,"['前端开发', 'CSS', 'HTML', 'web', 'Vue']

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MainActivity.java

package com.example.may.exp3;

import android.app.Activity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.PopupMenu;

import java.util.ArrayList;

public class MainActivity extends Activity {

    private ArrayList<String> data;
    private ListView listView1;
    private ArrayAdapter adapter;

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

        data= new ArrayList<>();
        listView1=(ListView)findViewById(R.id.ListView01);
        //添加按钮
        Button button=(Button)findViewById(R.id.button1);
        button.setOnClickListener(new View.OnClickListener(){
                                      @Override
                                      public void onClick(View v){
                                          //创建数据源
                                          EditText tv1=(EditText)findViewById(R.id.input1);
                                          String class_=tv1.getText().toString();
                                          EditText tv2=(EditText)findViewById(R.id.input2);
                                          String number=tv2.getText().toString();
                                          EditText tv3=(EditText)findViewById(R.id.input3);
                                          String name=tv3.getText().toString();

                                          Student student=new Student(class_,number,name);
                                          data.add(student.toString());

                                          //为适配器添加数据源
                                          adapter=new ArrayAdapter<String>(
                                                  MainActivity.this,android.R.layout.simple_list_item_1,data);
                                          //为ListView的容器添加适配器
                                          listView1.setAdapter(adapter);

                                          listView1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
                                                                                   @Override
                                                                                   public boolean onItemLongClick(AdapterView<?> adapterView, View view, final int i, long l) {
                                                                                       if (l > 0) {
                                                                                           PopupMenu popup = new PopupMenu(MainActivity.this, view);
                                                                                           popup.getMenuInflater().inflate(R.menu.main_menu, popup.getMenu());
                                                                                           popup.show();
                                                                                           popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                                                                                               @Override
                                                                                               public boolean onMenuItemClick(MenuItem item) {
                                                                                                   switch (item.getItemId()){
                                                                                                       case R.id.menu1:
                                                                                                           ArrayAdapter temp_adp=(ArrayAdapter)listView1.getAdapter();
                                                                                                           temp_adp.remove(temp_adp.getItem(i));
                                                                                                           return true;
                                                                                                       default:
                                                                                                           return false;
                                                                                                   }
                                                                                               }
                                                                                           });
                                                                                       }
                                                                                       return true;
                                                                                   }
                                                                               }
                                          );
                                      }
                                  }
        );
    }

    class Student{
        private String class_;
        private String number;
        private String name;

        public Student(String c,String nu,String na){
            this.class_=c;
            this.number=nu;
            this.name=na;
        }

        @Override
        public String toString(){
            return class_+"        "+number+"        "+name;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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"
    android:orientation="vertical"
    tools:context="com.example.may.exp3.MainActivity">

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="80dp"
            android:layout_height="40dp"
            android:text="班级："
            android:gravity="center" />

        <EditText
            android:id="@+id/input1"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="信管163班"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/TextView01"
            android:layout_width="80dp"
            android:layout_height="40dp"
            android:text="学号："
            android:gravity="center" />

        <EditText
            android:id="@+id/input2"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="2016013040"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="80dp"
            android:layout_height="40dp"
            android:text="姓名："
            android:gravity="center" />

        <EditText
            android:id="@+id/input3"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="王梅"/>
    </LinearLayout>

    <LinearLayoutLinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="添加" />

    </LinearLayoutLinearLayout>

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="100dp"
            android:layout_height="40dp"
            android:text="班级"
            android:gravity="center" />

        <TextView
            android:layout_width="100dp"
            android:layout_height="40dp"
            android:text="学号"
            android:gravity="center" />

        <TextView
            android:layout_width="100dp"
            android:layout_height="40dp"
            android:text="姓名"
            android:gravity="center" />


    </LinearLayout>


    <ListView
        android:id="@+id/ListView01"
        android:layout_width="match_parent"
        android:layout_height="495dp">
    </ListView>

</LinearLayout>

menu_main.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:id="@+id/menu1"
        android:title="删除">
    </item>
</menu>