安卓studio学生管理系统源代码

以下是两个基于Android Studio开发的学生信息管理系统的源代码：
1. 学生信息管理系统实现源码（安卓开发教程课后练习）

// 省略部分代码
public class MainActivity extends AppCompatActivity {
    private EditText et_name, et_age, et_major;
    private Button btn_add, btn_query, btn_update, btn_delete;
    private ListView lv_student;
    private List<Student> studentList = new ArrayList<>();
    private StudentAdapter adapter;

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

        et_name = findViewById(R.id.et_name);
        et_age = findViewById(R.id.et_age);
        et_major = findViewById(R.id.et_major);
        btn_add = findViewById(R.id.btn_add);
        btn_query = findViewById(R.id.btn_query);
        btn_update = findViewById(R.id.btn_update);
        btn_delete = findViewById(R.id.btn_delete);
        lv_student = findViewById(R.id.lv_student);

        adapter = new StudentAdapter(this, studentList);
        lv_student.setAdapter(adapter);

        // 添加学生信息
        btn_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                String age = et_age.getText().toString().trim();
                String major = et_major.getText().toString().trim();
                if (TextUtils.isEmpty(name) || TextUtils.isEmpty(age) || TextUtils.isEmpty(major)) {
                    Toast.makeText(MainActivity.this, "请填写完整信息", Toast.LENGTH_SHORT).show();
                    return;
                }
                Student student = new Student(name, Integer.parseInt(age), major);
                studentList.add(student);
                adapter.notifyDataSetChanged();
                Toast.makeText(MainActivity.this, "添加成功", Toast.LENGTH_SHORT).show();
            }
        });

        // 查询学生信息
        btn_query.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                if (TextUtils.isEmpty(name)) {
                    Toast.makeText(MainActivity.this, "请输入姓名", Toast.LENGTH_SHORT).show();
                    return;
                }
                for (Student student : studentList) {
                    if (name.equals(student.getName())) {
                        et_age.setText(String.valueOf(student.getAge()));
                        et_major.setText(student.getMajor());
                        Toast.makeText(MainActivity.this, "查询成功", Toast.LENGTH_SHORT).show();
                        return;
                    }
                }
                Toast.makeText(MainActivity.this, "未找到该学生信息", Toast.LENGTH_SHORT).show();
            }
        });

        // 修改学生信息
        btn_update.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                String age = et_age.getText().toString().trim();
                String major = et_major.getText().toString().trim();
                if (TextUtils.isEmpty(name) || TextUtils.isEmpty(age) || TextUtils.isEmpty(major)) {
                    Toast.makeText(MainActivity.this, "请填写完整信息", Toast.LENGTH_SHORT).show();
                    return;
                }
                for (Student student : studentList) {
                    if (name.equals(student.getName())) {
                        student.setAge(Integer.parseInt(age));
                        student.setMajor(major);
                        adapter.notifyDataSetChanged();
                        Toast.makeText(MainActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
                        return;
                    }
                }
                Toast.makeText(MainActivity.this, "未找到该学生信息", Toast.LENGTH_SHORT).show();
            }
        });

        // 删除学生信息
        btn_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                if (TextUtils.isEmpty(name)) {
                    Toast.makeText(MainActivity.this, "请输入姓名", Toast.LENGTH_SHORT).show();
                    return;
                }
                for (Student student : studentList) {
                    if (name.equals(student.getName())) {
                        studentList.remove(student);
                        adapter.notifyDataSetChanged();
                        Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
                        return;
                    }
                }
                Toast.makeText(MainActivity.this, "未找到该学生信息", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

2. 基于SQLite数据库编写的学生管理系统源码

// 省略部分代码
public class MainActivity extends AppCompatActivity {
    private EditText et_name, et_age, et_major;
    private Button btn_add, btn_query, btn_update, btn_delete;
    private ListView lv_student;
    private List<Student> studentList = new ArrayList<>();
    private StudentAdapter adapter;
    private SQLiteDatabase db;

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

        et_name = findViewById(R.id.et_name);
        et_age = findViewById(R.id.et_age);
        et_major = findViewById(R.id.et_major);
        btn_add = findViewById(R.id.btn_add);
        btn_query = findViewById(R.id.btn_query);
        btn_update = findViewById(R.id.btn_update);
        btn_delete = findViewById(R.id.btn_delete);
        lv_student = findViewById(R.id.lv_student);

        adapter = new StudentAdapter(this, studentList);
        lv_student.setAdapter(adapter);

        // 打开或创建数据库
        db = openOrCreateDatabase("student.db", MODE_PRIVATE, null);
        db.execSQL("CREATE TABLE IF NOT EXISTS student(_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INTEGER, major TEXT)");

        // 添加学生信息
        btn_add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                String age = et_age.getText().toString().trim();
                String major = et_major.getText().toString().trim();
                if (TextUtils.isEmpty(name) || TextUtils.isEmpty(age) || TextUtils.isEmpty(major)) {
                    Toast.makeText(MainActivity.this, "请填写完整信息", Toast.LENGTH_SHORT).show();
                    return;
                }
                ContentValues values = new ContentValues();
                values.put("name", name);
                values.put("age", Integer.parseInt(age));
                values.put("major", major);
                db.insert("student", null, values);
                queryData();
                Toast.makeText(MainActivity.this, "添加成功", Toast.LENGTH_SHORT).show();
            }
        });

        // 查询学生信息
        btn_query.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                if (TextUtils.isEmpty(name)) {
                    Toast.makeText(MainActivity.this, "请输入姓名", Toast.LENGTH_SHORT).show();
                    return;
                }
                Cursor cursor = db.rawQuery("SELECT * FROM student WHERE name=?", new String[]{name});
                if (cursor.moveToFirst()) {
                    et_age.setText(String.valueOf(cursor.getInt(cursor.getColumnIndex("age"))));
                    et_major.setText(cursor.getString(cursor.getColumnIndex("major")));
                    Toast.makeText(MainActivity.this, "查询成功", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(MainActivity.this, "未找到该学生信息", Toast.LENGTH_SHORT).show();
                }
                cursor.close();
            }
        });

        // 修改学生信息
        btn_update.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                String age = et_age.getText().toString().trim();
                String major = et_major.getText().toString().trim();
                if (TextUtils.isEmpty(name) || TextUtils.isEmpty(age) || TextUtils.isEmpty(major)) {
                    Toast.makeText(MainActivity.this, "请填写完整信息", Toast.LENGTH_SHORT).show();
                    return;
                }
                ContentValues values = new ContentValues();
                values.put("age", Integer.parseInt(age));
                values.put("major", major);
                db.update("student", values, "name=?", new String[]{name});
                queryData();
                Toast.makeText(MainActivity.this, "修改成功", Toast.LENGTH_SHORT).show();
            }
        });

        // 删除学生信息
        btn_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = et_name.getText().toString().trim();
                if (TextUtils.isEmpty(name)) {
                    Toast.makeText(MainActivity.this, "请输入姓名", Toast.LENGTH_SHORT).show();
                    return;
                }
                db.delete("student", "name=?", new String[]{name});
                queryData();
                Toast.makeText(MainActivity.this, "删除成功", Toast.LENGTH_SHORT).show();
            }
        });

        // 查询所有学生信息
        queryData();
    }

    // 查询数据库中所有学生信息
    private void queryData() {
        studentList.clear();
        Cursor cursor = db.rawQuery("SELECT * FROM student", null);
        while (cursor.moveToNext()) {
            String name = cursor.getString(cursor.getColumnIndex("name"));
            int age = cursor.getInt(cursor.getColumnIndex("age"));
            String major = cursor.getString(cursor.getColumnIndex("major"));
            Student student = new Student(name, age, major);
            studentList.add(student);
        }
        adapter.notifyDataSetChanged();
        cursor.close();
    }
}