Question

我有Fragment RecyclerView。用户输入数据，它们将存储在SQLite DataBase中。我正在Search items尝试RecyclerView，但它不起作用，

这是我的Fragment：

public class FragmentOne extends Fragment {

private RecyclerView mDetailRecyclerView;
private DetailAdapter mAdapter;
private boolean mNumberVisible;
private SearchView sv;
private ArrayList<Detail> mDetails=new ArrayList<>();

private View view;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}

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

    mDetailRecyclerView = (RecyclerView) view.findViewById(R.id.detail_recycler_view);

    LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
    layoutManager.setReverseLayout(true); //This will reverse the data order but not scroll the RecyclerView to the last item
    layoutManager.setStackFromEnd(true); //For keeping data order same and simply scrolling the RecyclerView to the last item
    mDetailRecyclerView.setLayoutManager(layoutManager);

    if (savedInstanceState != null) {
        mNumberVisible =
                savedInstanceState.getBoolean(SAVED_NUMBER_VISIBLE);
    }

    sv = (SearchView) view.findViewById(R.id.sv);
    mAdapter = new DetailAdapter(mDetails);

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

        @Override
        public boolean onQueryTextChange(String query) {
            getDetailsSearch(query);
            return false;
        }
    });

    initViews();
    updateUI();
    return view;


}

@Override
public void onResume() {
    super.onResume();
    updateUI();
}



   @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putBoolean(SAVED_NUMBER_VISIBLE, mNumberVisible);
    }

..
..
private class DetailHolder extends RecyclerView.ViewHolder
        implements View.OnClickListener, View.OnLongClickListener {
    private TextView mTitleTextView;
    //        private TextView mDateTextView;
    private Detail mDetail;
    private RatingBar mRatingBar;

    public DetailHolder(LayoutInflater inflater, ViewGroup parent) {
        super(inflater.inflate(R.layout.list_item_detail,
                parent, false));

        itemView.setOnClickListener(this);
        itemView.setOnLongClickListener(this);
        mTitleTextView = (TextView) itemView.findViewById(R.id.detail_title);
        mRatingBar = (RatingBar) itemView.findViewById(R.id.ratingBar);
    }

    public void bind(Detail detail) {
        mDetail = detail;
        mTitleTextView.setText(mDetail.getTitle());
        mRatingBar.setRating(mDetail.getRate());
    }

    @Override
    public void onClick(View view) {
        Intent intent = DetailPagerActivity.newIntent(getActivity(),
                mDetail.getId());
        startActivity(intent);
    }
}


private class DetailAdapter extends RecyclerView.Adapter<DetailHolder> {
    private List<Detail> mDetails;
    private Detail mDetail;

    public DetailAdapter(List<Detail> details) {
        mDetails = details;
    }

    @Override
    public DetailHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
        return new DetailHolder(layoutInflater, parent);
    }

    @Override
    public void onBindViewHolder(DetailHolder holder, int position) {
        Detail detail = mDetails.get(position);
        holder.bind(detail);
    }

    @Override
    public int getItemCount() {
        return mDetails.size();
    }

    public void setDetails(final List<Detail> details) {
        mDetails = details;
    }

    ..
    ..

}

public void initViews(){
    mDetailRecyclerView.setAdapter(mAdapter);
    initSwipe();
}

..
..

private void getDetailsSearch (String searchTerm) {
    mDetails.clear();

    DBAdapter db = new DBAdapter(getActivity());
    db.openDB();
    Detail p = null;
    Cursor c = db.retrieve(searchTerm);

    while (c.moveToNext()) {
        String title = c.getString(2);

        p = new Detail();
        p.setTitle(title);

        mDetails.add(p);
    }

    db.closeDB();
    mDetailRecyclerView.setAdapter(mAdapter);
}
}

这是我的Database Adapter：

public class DBAdapter {
    Context c;
    SQLiteDatabase db;
    DetailBaseHelper helper;

    public DBAdapter (Context c) {
        this.c = c;
        helper = new DetailBaseHelper(c);
    }

    public void openDB() {
        try {
            db = helper.getWritableDatabase();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void closeDB() {
        try {
            helper.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public Cursor retrieve (String searchTerm) {
        String[] columns = {
            "_id",
            "uuid",
            "title",
            "des",
            "date",
            "rate"
        Cursor c = null;

        if (searchTerm != null && searchTerm.length()>0) {
            String sql ="SELECT * FROM " +DetailDbSchema.DetailTable.NAME+
                    " WHERE "+DetailDbSchema.DetailTable.Cols.TITLE+
                    " LIKE '%"+searchTerm+"%'";
            c = db.rawQuery(sql, null);
            return c;
        }

        c = db.query(DetailDbSchema.DetailTable.NAME, columns,
                null, null, null, null, null);
        return c;
    }
}

这里是DataBase Helper：

public class DetailBaseHelper extends SQLiteOpenHelper{
    private static final int VERSION = 1;
    private static final String DATABASE_NAME = "detailBase.db";

    public DetailBaseHelper (Context context) {
        super(context, DATABASE_NAME, null, VERSION);
    }

    @Override
    public void onCreate (SQLiteDatabase db) {
        db.execSQL("create table " + DetailTable.NAME +
                "(" +
                " _id integer primary key autoincrement," +
                DetailTable.Cols.UUID + ", " +
                DetailTable.Cols.TITLE + ", " +
                DetailTable.Cols.DES + ", " +
                DetailTable.Cols.DATE + ", " +
                DetailTable.Cols.RATE +
                ")"
        );
    }

    @Override
    public void onUpgrade (SQLiteDatabase db,
                           int oldVersion, int newVersion) {
    }
}

here是我用于此的教程， 如果你有任何想法帮助我，我将不胜感激。

Answer 1

我认为主要的问题是你在这里更换适配器，但新的适配器从未被结果数据修改过，而且你必须通知你的回收者数据集已经改变。所以

private void getDetailsSearch (String searchTerm) {
mDetails.clear();
/// the loop wiith the cursor

/// change the dataset
mAdapter = new DetailAdapter(mDetails);

mDetailRecyclerView.setAdapter(mAdapter);

/// tell the recycler there is a different data to display
mDetailRecyclerView.notifyDataSetChanged();

}

SearchView不适用于RecyclerView＆amp; SQLite的

1 个答案: