学生管理系统初步实现增加功能

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学生管理系统初步实现增加功能

2024-11-24 14:00:38 203人阅读

1,创建主界面

2,创建listView高级控件中的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:orientation="horizontal" >
    <TextView
        android:id="@+id/tv_listName"
        android:textSize="20sp"
        android:layout_marginLeft="5dip"
        android:layout_marginTop="10dip"
        android:textColor="@android:color/black"
        android:layout_width="0dip"
        android:layout_weight="1"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/tv_listSex"
        android:textSize="20sp"
        android:layout_marginTop="10dip"
        android:textColor="@android:color/black"
        android:layout_width="0dip"
        android:layout_weight="1"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/tv_listAge"
        android:textSize="20sp"
        android:layout_marginTop="10dip"
        android:textColor="@android:color/black"
        android:layout_width="0dip"
        android:layout_weight="1"
        android:layout_height="wrap_content" />
</LinearLayout>

3,封装一个学生类

package com.eduask.studentmanagersystem;
public class Students {
   private String name;
   private String sex;
   private int age;
   public Students(){}
   public Students(String name, String sex, int age) {
       this.name = name;
       this.sex = sex;
       this.age = age;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getSex() {
       return sex;
   }
   public void setSex(String sex) {
       this.sex = sex;
   }
   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
}

4,具体的实现

package com.eduask.studentmanagersystem;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
   private List<Students> students = new ArrayList<Students>();
   private ListView lv_values;
   private Button btn_add;
   private MyAdapter adapter;
   private EditText et_name;
   private EditText et_sex;
   private EditText et_age;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //找到相应的控件
       lv_values = (ListView) findViewById(R.id.lv_values);
       btn_add = (Button) findViewById(R.id.btn_add);
       et_name = (EditText) findViewById(R.id.et_name);
       et_sex = (EditText) findViewById(R.id.et_sex);
       et_age = (EditText) findViewById(R.id.et_age);
       //自定义适配器
       adapter = new MyAdapter();
       if(adapter != null){
           lv_values.setAdapter(adapter);
       }
       btn_add.setOnClickListener(new OnClickListener() {
       @Override
       public void onClick(View v) {
           String name = et_name.getText().toString().trim();
           String sex = et_sex.getText().toString().trim();
           int age = Integer.parseInt(et_age.getText().toString().trim());

           if(name != null && sex != null && age != 0){
               Students stu = new Students();
               stu.setName(name);
               stu.setSex(sex);
               stu.setAge(age);
               students.add(stu);
               Toast.makeText(getApplicationContext(), "增加成功！！", 2000).show();
               adapter.notifyDataSetChanged(); //更新
           }
       }
   });
    }
    private class MyAdapter extends BaseAdapter{

       @Override
       public int getCount() {
           // TODO Auto-generated method stub
           return students.size();
       }
       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           //加载布局
           View contentView = View.inflate(getApplicationContext(), R.layout.list_students, null);
           //找到布局中的控件
           TextView tv_listName = (TextView) contentView.findViewById(R.id.tv_listName);
           TextView tv_listSex = (TextView) contentView.findViewById(R.id.tv_listSex);
           TextView tv_listAge = (TextView) contentView.findViewById(R.id.tv_listAge);
           //加载相应的数据
           tv_listName.setText(students.get(position).getName());
           tv_listSex.setText(students.get(position).getSex());
           tv_listAge.setText(String.valueOf(students.get(position).getAge()));
            return contentView;
       }
       @Override
       public Object getItem(int arg0) {
           // TODO Auto-generated method stub
           return null;
       }
       @Override
       public long getItemId(int arg0) {
           // TODO Auto-generated method stub
           return 0;
        }
    }
}

本文出自 “InProvence” 博客，谢绝转载！

学生管理系统初步实现增加功能

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学生管理系统初步实现增加功能

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