要计算SQLite数据库中某个表中的重复值，可以使用以下步骤：

1. 在Android Studio中创建一个新的Android项目。
2. 在项目的build.gradle文件中添加SQLite依赖：

implementation 'androidx.sqlite:sqlite:2.2.0'

3. 创建一个SQLiteOpenHelper类，继承自SQLiteOpenHelper，并实现onCreate()和onUpgrade()方法。

public class DBHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "mydatabase.db";
    private static final int DATABASE_VERSION = 1;
    private static final String TABLE_NAME = "mytable";
    private static final String COLUMN_NAME = "name";

    public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTableQuery = "CREATE TABLE " + TABLE_NAME +
                " (id INTEGER PRIMARY KEY AUTOINCREMENT, " +
                COLUMN_NAME + " TEXT)";
        db.execSQL(createTableQuery);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        String dropTableQuery = "DROP TABLE IF EXISTS " + TABLE_NAME;
        db.execSQL(dropTableQuery);
        onCreate(db);
    }
}

4. 在MainActivity中使用上述SQLiteOpenHelper类创建或打开数据库，并执行查询来计算重复值。

public class MainActivity extends AppCompatActivity {
    private DBHelper dbHelper;

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

        dbHelper = new DBHelper(this);
        SQLiteDatabase db = dbHelper.getReadableDatabase();

        String query = "SELECT " + COLUMN_NAME + ", COUNT(" + COLUMN_NAME + ") as count " +
                "FROM " + TABLE_NAME +
                " GROUP BY " + COLUMN_NAME +
                " HAVING count > 1";

        Cursor cursor = db.rawQuery(query, null);
        if (cursor.moveToFirst()) {
            do {
                String name = cursor.getString(cursor.getColumnIndex(COLUMN_NAME));
                int count = cursor.getInt(cursor.getColumnIndex("count"));
                Log.d("Duplicate", "Name: " + name + ", Count: " + count);
            } while (cursor.moveToNext());
        }
        cursor.close();
        db.close();
    }
}

这个示例代码将检查数据库中的重复值，并将重复的名称和计数打印到Logcat中。可以根据需要修改代码来适应特定的应用场景。