美好的一天抱歉提出这些问题。希望有人帮我解决我的问题。也希望我的问题足够清楚，以便有人不会投票。我刚接触这个安卓机器。我只是观察并遵循一些教程来完成这些代码并在stackoverflow中询问问题，这时我很难理解。
这是我当前的代码，它只获取第一行，但它没有在我的CardView中显示它？
我如何获取所有行然后显示所有行列数据？
这是 log cat响应，用于在 SQLite DB 中插入数据。
D/SQLiteHandler: Members's SL Details was successfully inserted: 1
D/SQLiteHandler: Successfully inserted SL Desc: Test Account 1
D/SQLiteHandler: Successfully inserted Transaction Date: 2015-08-17
D/SQLiteHandler: Successfully inserted Actual Balance: 483.67
D/SQLiteHandler: Successfully inserted Available Balance: 483.67
D/SQLiteHandler: -------------------------------------------------------------------
D/SQLiteHandler: Members's SL Details was successfully inserted: 2
D/SQLiteHandler: Successfully inserted SL Desc: Test Account 2
D/SQLiteHandler: Successfully inserted Transaction Date: 2015-08-28
D/SQLiteHandler: Successfully inserted Actual Balance: 10129.43
D/SQLiteHandler: Successfully inserted Available Balance: 10129.43
D/SQLiteHandler: --------------------------------------------------------------------
log cat response 用于获取 SL详情
D/SQLiteHandler: List<Datas>) Getting members' SL Description: Test Account 1
D/SQLiteHandler: List<Datas>) Getting members' SL TR Date: 2015-08-17
D/SQLiteHandler: List<Datas>) Getting members' SL Actual Balance: 483.67
D/SQLiteHandler: List<Datas>) Getting members' SL Available Balance: 483.67
D/SQLiteHandler: -------------------------------------------------------------------------
D/SQLiteHandler: List<Datas>) Members's SL Details data: gsacmobileportal.activity.Datas@5357143c
它只返回第1行。我怎样才能获取所有行然后显示所有行列数据？
SQLiteHandler.java
/**
* Getting user data from List
* */
public List<Datas> getUserSLDetails() {
String selectQuery = "SELECT * FROM " + TABLE_MEMBERS_SLDTL;
List<Datas> mMemberDetails = new ArrayList<>();
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// Move to first row
cursor.moveToFirst();
if (cursor.getCount() > 0) {
Datas pMemebr = new Datas();
pMemebr.setSL_DESC(cursor.getString(0));
pMemebr.setTR_DATE(cursor.getString(1));
pMemebr.setACTUAL_BALANCE(cursor.getString(2));
pMemebr.setAVAILABLE_BALANCE(cursor.getString(3));
mMemberDetails.add(pMemebr);
Log.d(TAG, "List<Datas>) Getting members' SL Description: " + cursor.getString(0));
Log.d(TAG, "List<Datas>) Getting members' SL TR Date: " + cursor.getString(1));
Log.d(TAG, "List<Datas>) Getting members' SL Actual Balance: " + cursor.getString(2));
Log.d(TAG, "List<Datas>) Getting members' SL Available Balance: " + cursor.getString(3));
Log.d(TAG, "-------------------------------------------------------------------------");
Log.d(TAG, "List<Datas>) Members's SL Details data: " + pMemebr.toString());
}
else{
Log.d("getUserSLDetails()", "member's SL Details data is empty");
}
cursor.close();
db.close();
return mMemberDetails;
}
Datas.java
/**
* Created by shifoodew on 7/28/2017.
*/
public class Datas {
private String SL_DESC;
private String TR_DATE;
private String ACTUAL_BALANCE;
private String AVAILABLE_BALANCE;
public String getSL_DESC() {
return SL_DESC;
}
public void setSL_DESC(String SL_DESC) {
this.SL_DESC = SL_DESC;
}
public String getTR_DATE() {
return TR_DATE;
}
public void setTR_DATE(String TR_DATE) {
this.TR_DATE = TR_DATE;
}
public String getACTUAL_BALANCE() {
return ACTUAL_BALANCE;
}
public void setACTUAL_BALANCE(String ACTUAL_BALANCE) {
this.ACTUAL_BALANCE = ACTUAL_BALANCE;
}
public String getAVAILABLE_BALANCE() {
return AVAILABLE_BALANCE;
}
public void setAVAILABLE_BALANCE(String AVAILABLE_BALANCE) {
this.AVAILABLE_BALANCE = AVAILABLE_BALANCE;
}
}
MyAdapter.java
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private List<Datas> mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class MyViewHolder extends RecyclerView.ViewHolder {
public CardView mCardView;
public TextView account_type;
public TextView accnt_description;
public TextView balance_label;
public TextView account_balance;
public MyViewHolder(View v) {
super(v);
mCardView = (CardView) v.findViewById(R.id.card_view);
account_type = (TextView) v.findViewById(R.id.lblShareCapital);
balance_label = (TextView) v.findViewById(R.id.lblAvailableBalance);
accnt_description = (TextView) v.findViewById(R.id.sl_desc);
account_balance = (TextView) v.findViewById(R.id.actual_balance);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(List<Datas> myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
@Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_item, parent, false);
// set the view's size, margins, paddings and layout parameters
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
//holder.account_type.setText(mDataset[position]);
Datas datas = mDataset.get(position);
holder.account_balance.setText(datas.getSL_DESC());
holder.mCardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String sl_desc = mDataset.get(position).getSL_DESC();
String actual_balance = mDataset.get(position).getACTUAL_BALANCE();
Log.d("CardView", "CardView Clicked: " + sl_desc);
Log.d("CardView", "CardView Clicked: " + actual_balance);
}
});
}
@Override
public int getItemCount() {
//return mDataset.length;
return 0;
}
}
AccountsFragment.java
public class AccountsFragment extends Fragment {
private SQLiteHandler db;
public AccountsFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_accounts, container, false);
RecyclerView rv = (RecyclerView) rootView.findViewById(R.id.rv_recycler_view);
rv.setHasFixedSize(true);
SQLiteHandler db = new SQLiteHandler(getActivity());
MyAdapter adapter = new MyAdapter(db.getUserSLDetails());
rv.setAdapter(adapter);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(llm);
return rootView;
}
}
答案 0 :(得分：0)
使用do while循环
if (cursor.moveToFirst()) {
do {
Datas data = new DiaryData(cursor.getString(0), cursor.getString(1), cursor.getString(2), cursor.getString(3)
, cursor.getString(4));
// Adding data to list
mMemberDetails.add(data);
} while (cursor.moveToNext());
}
cursor.close();
return mMemberDetails;
答案 1 :(得分：0)
你传递0因此没有可用的项目所以使用
@Override
public int getItemCount() {
//return mDataset.length;
return mdataset.size();
}
答案 2 :(得分：0)
现在你只是恢复光标的第一个结果。检查你写的这段代码：
if (cursor.getCount() > 0) {
...
mMemberDetails.add(pMemebr);
...
}
您只获得第一个且唯一的第一个项目。你需要遍历游标。而不是那样if (cursor.getCount() > 0)考虑改为while (cursor.moveToNext())
您可以在this question
中找到有关游标的更多信息答案 3 :(得分：0)
首先，您需要在 SQLiteHandler 类
中迭代 getUserSLDetails 方法if (cursor.moveToFirst()) {
do {
Datas pMemebr = new Datas();
pMemebr.setSL_DESC(cursor.getString(0));
pMemebr.setTR_DATE(cursor.getString(1));
pMemebr.setACTUAL_BALANCE(cursor.getString(2));
pMemebr.setAVAILABLE_BALANCE(cursor.getString(3));
mMemberDetails.add(pMemebr);
Log.d(TAG, "List<Datas>) Getting members' SL Description: " + cursor.getString(0));
Log.d(TAG, "List<Datas>) Getting members' SL TR Date: " + cursor.getString(1));
Log.d(TAG, "List<Datas>) Getting members' SL Actual Balance: " + cursor.getString(2));
Log.d(TAG, "List<Datas>) Getting members' SL Available Balance: " + cursor.getString(3));
Log.d(TAG, "-------------------------------------------------------------------------");
Log.d(TAG, "List<Datas>) Members's SL Details data: " + pMemebr.toString());
} while (cursor.moveToNext());
}
cursor.close();
return mMemberDetails;
}
然后在 MyAdapter 中，您需要更改以下方法 -
@Override
public int getItemCount() {
//return mDataset.length;
return mdataset.size();
}
请在确认数据正确无误后删除日志。