Question

我是Android新手，我正在寻找在ListView中加载大量数据然后使用SearchView过滤它们的最佳方法。我从数据库中获取数据，查询返回大约25000条记录。这是我能够实现的解决方案，但不确定它是最好的（当然不是最快的！）：

这是片段：

public class FragmentOne extends Fragment {

ListView lv;
MyAdapter myAdapter;
SearchView sv;
ArrayList<MyObject> listMyObject;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_one, container, false);
    return view;
}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    sv = (SearchView) getView().findViewById(R.id.searchView);
    lv = (ListView) getView().findViewById(R.id.listView);
    setData("");

    sv.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            setData(newText);
            return false;
        }
    });
}

public void setData(String params) {
    String query = "select *, count(*) as num from table where field_1 like '" + params + "%' group by field_1 order by field_1";
    listMyObject= new ArrayList<>();
    DBHelper dbHelper;
    SQLiteDatabase sqLiteDatabase;
    String ... ;
    int ...;


    dbHelper = DBHelper.getInstance(getActivity().getApplicationContext());
    sqLiteDatabase = dbHelper.getReadableDatabase();
    Cursor cursor = sqLiteDatabase.rawQuery(query, null);
    if (cursor.getCount() > 0) {
        if (cursor.moveToFirst()) {
            do {
                ...
                listMyObject.add(new MyObject(...));
            } while (cursor.moveToNext());
        }
    }
    arrayAdapter = new MyAdapter(getActivity(), R.layout.listview_row, listMyObject);
    lv.setAdapter(myAdapter);
    dbHelper.close();
}

因为这个解决方案有点'慢（拥有大量数据），我该如何加速片段的加载？

Answer 1

首先检查可用的SQLite / ORM库b'z他们已经实现了许多功能，如缓存db或反应数据库等，并根据您的要求选择。然后尝试在SQL查询中使用分页加载数据。

选中此List of libraries

如何在ListView中快速加载大量数据，然后使用SearchView对其进行过滤？

1 个答案: