要根据Spinner选择从SQLite数据库中选择项目，你需要执行以下步骤：

1. 在Android Studio中创建一个新的项目，包括一个Spinner和一个ListView。

2. 创建一个SQLite数据库，并在其中创建一个数据表用于存储项目信息。

3. 创建一个自定义的适配器类，用于将数据库中的项目数据加载到Spinner中。

public class SpinnerAdapter extends ArrayAdapter {
    private Context mContext;
    private ArrayList mProjects;

    public SpinnerAdapter(Context context, ArrayList projects) {
        super(context, 0, projects);
        mContext = context;
        mProjects = projects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(android.R.layout.simple_spinner_item, parent, false);
        }
        TextView textView = convertView.findViewById(android.R.id.text1);
        textView.setText(mProjects.get(position));
        return convertView;
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(android.R.layout.simple_spinner_dropdown_item, parent, false);
        }
        TextView textView = convertView.findViewById(android.R.id.text1);
        textView.setText(mProjects.get(position));
        return convertView;
    }
}

4. 在MainActivity中初始化Spinner和ListView，并将适配器设置给Spinner。

public class MainActivity extends AppCompatActivity {
    private Spinner mSpinner;
    private ListView mListView;
    private SQLiteDatabase mDatabase;
    private SpinnerAdapter mSpinnerAdapter;

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

        mSpinner = findViewById(R.id.spinner);
        mListView = findViewById(R.id.list_view);

        mDatabase = openOrCreateDatabase("project.db", MODE_PRIVATE, null);
        mDatabase.execSQL("CREATE TABLE IF NOT EXISTS projects (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT)");

        ArrayList projects = new ArrayList<>();
        Cursor cursor = mDatabase.rawQuery("SELECT * FROM projects", null);
        if (cursor.moveToFirst()) {
            while (!cursor.isAfterLast()) {
                String projectName = cursor.getString(cursor.getColumnIndex("name"));
                projects.add(projectName);
                cursor.moveToNext();
            }
        }
        cursor.close();

        mSpinnerAdapter = new SpinnerAdapter(this, projects);
        mSpinner.setAdapter(mSpinnerAdapter);
    }
}

5. 添加一个Spinner的选择监听器，在选择项目时从数据库中加载对应的项目详情，并将其展示在ListView中。

mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
    @Override
    public void onItemSelected(AdapterView parent, View view, int position, long id) {
        String selectedProject = (String) parent.getItemAtPosition(position);
        Cursor cursor = mDatabase.rawQuery("SELECT * FROM projects WHERE name = ?", new String[]{selectedProject});
        if (cursor.moveToFirst()) {
            while (!cursor.isAfterLast()) {
                // 获取项目详情并展示在ListView中
                cursor.moveToNext();
            }
        }
        cursor.close();
    }

    @Override
    public void onNothingSelected(AdapterView parent) {
        // 当没有选择项目时的处理
    }
});

这样，当你选择Spinner中的项目时，就会从SQLite数据库中加载对应的项目详情并展示在ListView中。请根据你的具体需求进行相应的修改和完善。