使用类的回收站列表中未显示 Sqlite 数据
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【中文标题】使用类的回收站列表中未显示 Sqlite 数据【英文标题】：Sqlite Data Not Showing In Recycler List Using Class 【发布时间】：2019-10-05 10:54:57 【问题描述】：我正在解决一个问题，我想向回收商列表显示特定的 sqlite 表数据。当我运行应用程序时，为了显示 sqlite 表数据，应用程序没有向我显示任何内容...
这是我的应用程序数据库助手类
private static final int DATABASE_VERSION = 2;
private static final String DATABASE_NAME = "DynamicERP.db";
public static final String table_orders = "TABLEORDERS";
public static final String table_poducts_records = "PRODUCTSRECORDS";
public static final String code = "ORDERCODE";
public static final String barcode = "BARCODE";
public static final String nametblp = "NAME";
public static final String size = "SIZE";
public static final String uname = "UNAME";
public static final String retail = "RETAIL";
public static final String wholesale = "WHOLESALE";
public static final String trade = "TRADE";
public static final String percentage = "PERCENTAGE";
public static final String tax = "TAX";
public static final String subcatagary = "SUBCATAGARY";
public static final String categary = "CATEGARY";
public static final String company = "COMPANY";
public static final String type = "TYPE";
public static final String packsize = "PACKSIZE";
public static final String weight = "WEIGHT";
public static final String weightunit = "WEIGHTUNIT";
public static final String currentstock = "CURRENTSTOCK";
public static final String salecode = "SALECODE";
public static final String mcode = "MCODE";
public static final String fname = "FIRSTNAME";
public static final String lname = "LASTNAME";
public static final String urduname = "URDUNAME";
public static final String address = "ADDRESS";
public static final String contact = "CONTACT";
public static final String cnic = "CNIC";
public static final String saletype = "TYPE";
public static final String route = "ROUTE";
public static final String area = "AREA";
public static final String zone = "ZONE";
public static final String balance = "BALANCE";
public static final String creditlimit = "CREDITLIMIT";
public static final String spl = "SPL";
public static final String saletax = "SALETAX";
private static final String DATABASE_ORDERS = "CREATE TABLE " + table_orders + "("
+ code + " INTEGER, " + barcode + " VARCHAR," + nametblp + " VARCHAR," + size + " VARCHAR," + uname +
" VARCHAR," + retail + " VARCHAR," + wholesale + " VARCHAR," + trade + " VARCHAR,"
+ percentage + " VARCHAR," + tax + " VARCHAR," + subcatagary + " VARCHAR," + categary + " VARCHAR," +
company + " VARCHAR," + type + " VARCHAR," + packsize + " VARCHAR," +
weight + " VARCHAR," + weightunit + " VARCHAR, " + currentstock + " VARCHAR );";
private static final String DATABASE_PRODUCTS = "CREATE TABLE " + table_poducts_records + "("
+ salecode + " INTEGER, " + mcode + " VARCHAR, " + fname + " VARCHAR, " + lname + " VARCHAR, " + urduname +
" VARCHAR, " + address + " NVARCHAR, " + contact + " VARCHAR," + cnic + " VARCHAR, " + saletype + " VARCHAR,"
+ route + " VARCHAR, " + area + " VARCHAR," + zone + " VARCHAR," +
balance + " VARCHAR, " + creditlimit + " VARCHAR," + spl + " VARCHAR, " + saletax + " VARCHAR);";
private String DROP_ORDER_REC = "DROP TABLE IF EXISTS " + table_orders;
private String DROP_PRODUCTS_REC = "DROP TABLE IF EXISTS " + table_poducts_records;
public DatabaseHelper(Context context)
super(context, DATABASE_NAME, null, DATABASE_VERSION);
@Override
public void onCreate(SQLiteDatabase db)
db.execSQL(DATABASE_ORDERS);
db.execSQL(DATABASE_PRODUCTS);
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
db.execSQL(DROP_PRODUCTS_REC);
db.execSQL(DROP_ORDER_REC);
onCreate(db);
public void addProductRec()
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(salecode, "123456");
values.put(mcode, "123654698");
values.put(fname, "Usman");
values.put(lname, "Ali");
values.put(urduname, "Usman");
values.put(contact, "021354545");
values.put(cnic, "54548787515");
values.put(saletype, "credit");
values.put(route, "Peshawer Road");
values.put(area, "wah");
values.put(zone, "Rawalpindi");
values.put(balance, "1000");
values.put(creditlimit, "10000");
values.put(spl, "212");
values.put(saletax, "10");
values.put(address, "wah");
db.insert(table_poducts_records, null, values);
db.close();
public void addOrders()
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(code, "098766");
values.put(barcode, "5544444445");
values.put(nametblp, "Usman");
values.put(size, "12");
values.put(uname, "Ali");
values.put(retail, "500");
values.put(wholesale, "whole");
values.put(trade, "credit");
values.put(percentage, "7");
values.put(tax, "1000");
values.put(subcatagary, "laptop");
values.put(categary, "computers");
values.put(company, "hp");
values.put(type, "laptop");
values.put(packsize, "12");
values.put(weight, "5");
values.put(weightunit, "kg");
values.put(currentstock, "57");
db.insert(table_orders, null, values);
db.close();
public List<GetSetOrders> getAllOrderData()
String[] columns =
nametblp,
trade,
retail,
subcatagary,
company
;
String sortOrder = nametblp + " ASC";
List<GetSetOrders> clientlist = new ArrayList<GetSetOrders>();
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.query(table_orders,
columns,
null,
null,
null,
null,
sortOrder);
if (cursor.moveToFirst())
do
GetSetOrders orders = new GetSetOrders();
orders.setNAME(cursor.getString(cursor.getColumnIndex(nametblp)));
orders.setTRADE(cursor.getString(cursor.getColumnIndex(trade)));
orders.setRETAIL(cursor.getString(cursor.getColumnIndex(retail)));
orders.setCATEGARY(cursor.getString(cursor.getColumnIndex(subcatagary)));
orders.setCOMPANY(cursor.getString(cursor.getColumnIndex(company)));
clientlist.add(orders);
while (cursor.moveToNext());
cursor.close();
db.close();
return clientlist;
这是我的客户端类，这个类也使用适配器...
RecyclerView recyclerViewClients;
Button btnAll;
ClientRecyclerAdapter clientRecyclerAdapter;
List<GetSetOrders> listclients;
DatabaseHelper databaseHelper;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View view = inflater.inflate(R.layout.clients, container, false);
btnAll=view.findViewById(R.id.searchall);
recyclerViewClients=view.findViewById(R.id.Viewclients);
listclients = new ArrayList<>();
clientRecyclerAdapter = new ClientRecyclerAdapter(listclients,recyclerViewClients);
recyclerViewClients.setItemAnimator(new DefaultItemAnimator());
recyclerViewClients.setItemAnimator(new DefaultItemAnimator());
recyclerViewClients.setHasFixedSize(true);
recyclerViewClients.setAdapter(clientRecyclerAdapter);
databaseHelper = new DatabaseHelper(getActivity());
btnAll.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
getClientFromSqlite();
Toast.makeText(getActivity(), "Usman", Toast.LENGTH_SHORT).show();
);
return view;
private void getClientFromSqlite()
new AsyncTask<Void, Void, Void>()
@Override
protected Void doInBackground(Void... params)
listclients.clear();
listclients.addAll(databaseHelper.getAllOrderData());
// clientRecyclerAdapter.notifyDataSetChanged();
return null;
@Override
protected void onPostExecute(Void aVoid)
super.onPostExecute(aVoid);
clientRecyclerAdapter.notifyDataSetChanged();
.execute();
这是我的回收器适配器类...
private List<GetSetOrders> listOrders;
Context mContext;
RecyclerView mRecyclerView;
View itemView;
public ClientRecyclerAdapter(List<GetSetOrders> listOrders, RecyclerView recyclerView)
this.listOrders = listOrders;
mRecyclerView = recyclerView;
@Override
public ClientViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
mContext = parent.getContext();
itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.items_products_table, parent, false);
return new ClientViewHolder(itemView);
public class ClientViewHolder extends RecyclerView.ViewHolder
public TextView lblPName;
public TextView lblTrade;
public TextView lblRetail;
public TextView lblSubCategary;
public TextView lblCompany;
RelativeLayout layout;
public ClientViewHolder(View view)
super(view);
lblPName = view.findViewById(R.id.lblPName);
lblTrade = view.findViewById(R.id.lblTrade);
lblRetail = view.findViewById(R.id.lblRetail);
lblSubCategary = view.findViewById(R.id.lblSubCategary);
lblCompany = view.findViewById(R.id.lblCompany);
layout = view.findViewById(R.id.listprod);
@Override
public void onBindViewHolder(ClientViewHolder holder, final int position)
holder.lblPName.setText(listOrders.get(position).getNAME());
holder.lblTrade.setText(listOrders.get(position).getORDERCODE());
holder.lblRetail.setText(listOrders.get(position).getRETAIL());
holder.lblSubCategary.setText(listOrders.get(position).getSUBCATAGARY());
holder.lblCompany.setText(listOrders.get(position).getCOMPANY());
holder.layout.setOnLongClickListener(new View.OnLongClickListener()
@Override
public boolean onLongClick(View v)
Toast.makeText(mContext, "ABC", Toast.LENGTH_SHORT).show();
return false;
);
@Override
public int getItemCount()
Log.v(ClientRecyclerAdapter.class.getSimpleName(), "" + listOrders.size());
return listOrders.size();
在客户端类中按下按钮后它没有显示任何数据...
【问题讨论】：
【参考方案1】：您忘记将布局管理器添加到您的recyclerViewClients
添加这一行。
recyclerViewClients.setLayoutManager(new LinearLayoutManager(getActivity()));
你的代码一定是这样的
clientRecyclerAdapter = new ClientRecyclerAdapter(listclients,recyclerViewClients);
recyclerViewClients.setItemAnimator(new DefaultItemAnimator());
recyclerViewClients.setItemAnimator(new DefaultItemAnimator()); //multi copy paste!
recyclerViewClients.setLayoutManager(new LinearLayoutManager(getActivity()));//Add this line
recyclerViewClients.setHasFixedSize(true);
recyclerViewClients.setAdapter(clientRecyclerAdapter);
【讨论】：
这条红线表示红线下的错误...线性布局管理器(android.content.client) @AlizaShah 将其替换为上下文。我将编辑我的答案 处理它并尝试运行它 很高兴为您提供帮助以上是关于使用类的回收站列表中未显示 Sqlite 数据的主要内容，如果未能解决你的问题，请参考以下文章
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