独立完成-假数据学生管理系统

男娘i 2022-05-31 09:11 132阅读 0赞

懂得l：

布局方式

泛型类。

实体类的使用 getter and setter 作用

使用MyAdapter extend BaseAdapter的各种细节使用。

mainac

import com.example.a49854.studentxuexi.domain.StudentInfo;
    
    import java.util.ArrayList;
    
    
    public class MainActivity extends AppCompatActivity {
    
        private EditText et_id;
        private EditText et_name;
        private EditText et_phone;
        private ListView lv;
        private ArrayList<StudentInfo> list;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            initView();
            // 1.找到控件
            // 2.模拟操作，添加假数据进行显示
            // 3.去除假数据，添加真实数据
            // 4.将真实数据写入到数据库中
            // 5.将数据库上传到服务器
    
    
    
        }
    
        /*
            初始化界面
         */
        private void initView() {
            setContentView(R.layout.activity_main);
    
            et_id = (EditText) findViewById(R.id.et_id);
            et_name = (EditText) findViewById(R.id.et_name);
            et_phone = (EditText) findViewById(R.id.et_phone);
            lv = (ListView) findViewById(R.id.lv);
    
            list = new ArrayList<>();
            for (int i = 0; i < 10; i++) {
    
                StudentInfo info = new StudentInfo();
                info.setId(i);
                info.setName("student" + i);
                info.setPhone("1234567891" + i);
                list.add(info);
            }
    
    
            lv.setAdapter(new MyAdapter());
    
        }
    
        private class MyAdapter extends BaseAdapter {
    
    
            @Override
            public int getCount() {
                return list.size();
            }
    
            @Override
            public View getView(final int position, View convertView, ViewGroup parent) {
                View view = View.inflate(MainActivity.this, R.layout.item, null);
                TextView tv_item_id = (TextView) view.findViewById(R.id.tv_item_id);
                TextView tv_item_name = (TextView) view.findViewById(R.id.tv_item_name);
                TextView tv_item_phone = (TextView) view.findViewById(R.id.tv_item_phone);
                ImageView iv_delete = (ImageView) view.findViewById(R.id.iv_delete);
    
                iv_delete.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        list.remove(position);
    //                    boolean result = dao.delete(map.get("studentid"));
    //                    if (result) {
    //                        Toast.makeText(MainActivity.this,"删除成功", Toast.LENGTH_SHORT).show();
    //                        lv.setAdapter(new MyAdapter());
    //                    }
                        lv.setAdapter(new MyAdapter());//这种方法其实不好
                    }
                });
    
    
                tv_item_id.setText(String.valueOf(list.get(position).getId()));
                tv_item_name.setText(list.get(position).getName());
                tv_item_phone.setText(list.get(position).getPhone());
    
                return view;
            }
    
            @Override
            public Object getItem(int position) {
                return list.get(position);
            }
    
            @Override
            public long getItemId(int position) {
                return position;
            }
    
    
        }
    }

StudentInfo

package com.example.a49854.studentxuexi.domain;
    
    /** * 学生信息的实体类 * @author Admin * @version $Rev$ * @des ${ TODO} * @updateAuthor $Author$ * @updateDes ${ TODO} */ public class StudentInfo {
        private Integer id;//
        private String name;
        private String phone;
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getPhone() {
            return phone;
        }
    
        public void setPhone(String phone) {
            this.phone = phone;
        }
    
        @Override
        public String toString() {
            return "StudentInfo{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", phone='" + phone + '\'' +
                    '}';
        }
    }

activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                  android:layout_width="match_parent"
                  android:layout_height="match_parent"
                  android:orientation="vertical">
    
        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:text="学生信息管理系统"
            android:textColor="#ff0000"
            android:textSize="20dp"/>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
    
            <TextView
                android:id="@+id/textView4"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="center_horizontal"
                android:text="学生id"
                android:textColor="#0000ff"/>
    
            <TextView
                android:id="@+id/textView3"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="center_horizontal"
                android:text="姓名"
                android:textColor="#0000ff"/>
    
            <TextView
                android:id="@+id/textView2"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:gravity="center_horizontal"
                android:text="联系电话"
                android:textColor="#0000ff"/>
        </LinearLayout>
    
        <ListView
            android:id="@+id/lv"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"/>
    
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">
    
            <EditText
                android:id="@+id/et_id"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:hint="输入id"
                android:inputType="textPersonName"/>
    
            <EditText
                android:id="@+id/et_name"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:hint="输入name"
                android:inputType="textPersonName"
                />
    
            <EditText
                android:id="@+id/et_phone"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:ems="10"
                android:hint="输入电话"
                android:inputType="textPersonName"/>
        </LinearLayout>
    
        <Button
            android:id="@+id/btn1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="添加" />
    
    </LinearLayout>

item.xml

<?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="wrap_content"
                  android:orientation="horizontal">
    
        <TextView
            android:id="@+id/tv_item_id"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:text="TextView"
            android:textColor="#ff0000"
            tools:text="学生id"/>
    
        <TextView
            android:id="@+id/tv_item_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:text="学生name"
            android:textColor="#00ff00"/>
    
        <TextView
            android:id="@+id/tv_item_phone"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center_horizontal"
            android:text="学生phone"
            android:textColor="#0000ff"
            />
    
        <ImageView
            android:id="@+id/iv_delete"
            android:layout_width="17dp"
            android:layout_height="17dp"
            app:srcCompat="@drawable/block_msg_delete"/>
    </LinearLayout>