Android 使用ListView扩展相同布局的两个片段不是唯一的
我正在创建一个小型Financecontrol应用程序。现在我面临着一个问题，我认为如果不打我的手机，我无法处理这个问题 我得到了一个活动，其中有一个从Android模板创建的ViewPager。 我有三个标签。第二个和第三个选项卡使用相同的片段类。以下是选项卡的代码段： 在会计活动中：Android 使用ListView扩展相同布局的两个片段不是唯一的,android,sqlite,listview,fragment,baseadapter,Android,Sqlite,Listview,Fragment,Baseadapter,我正在创建一个小型Financecontrol应用程序。现在我面临着一个问题，我认为如果不打我的手机，我无法处理这个问题 我得到了一个活动，其中有一个从Android模板创建的ViewPager。 我有三个标签。第二个和第三个选项卡使用相同的片段类。以下是选项卡的代码段： 在会计活动中： @Override public Fragment getItem(int position) { Fragment fragment = null;
@Override
public Fragment getItem(int position) {
Fragment fragment = null;
Bundle args = new Bundle();
switch (position) {
case POSITION_OVERVIEW:
fragment = new OverviewSectionFragment();
break;
case POSITION_INCOME:
args.putString("flag", TransactionSectionFragment.INCOME);
fragment = new TransactionSectionFragment();
fragment.setArguments(args);
break;
case POSITION_OUTGO:
args.putString("flag", TransactionSectionFragment.OUTGO);
fragment = new TransactionSectionFragment();
fragment.setArguments(args);
break;
}
return fragment;
}
public class TransactionSectionFragment extends Fragment {
OnDataChangedListener mCallback;
public interface OnDataChangedListener {
public void onDataChanged(int rnd);
}
// Private variables for IncomeSectionFragment
private FinanceDataSource datasource;
private ListView transactionList;
private CustomFinanceListAdapter adapter;
private String flag;
private Button newTran;
// public constants
public static final String INCOME = "i";
public static final String OUTGO = "o";
// Variables for Contextmenu
private static final int DETAILS_OPTION = Menu.FIRST;
private static final int DELETE_OPTION = DETAILS_OPTION + 1;
public TransactionSectionFragment() {
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (OnDataChangedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnDataChangedListener");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.fragment_account_transactions, container, false);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
newTran = (Button) getView().findViewById(R.id.new_entry_btn);
transactionList = (ListView) this.getView().findViewById(
R.id.transactionlist);
flag = getArguments().getString("flag");
datasource = new FinanceDataSource(getActivity());
datasource.open();
updateList();
registerForContextMenu(transactionList);
transactionList
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
Transaction tran = (Transaction) transactionList
.getItemAtPosition(position);
showTransactionDetails(tran);
}
});
newTran.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
datasource.insertSomeTransactions();
updateList();
}
});
}
@Override
public void onResume() {
datasource.open();
super.onResume();
}
@Override
public void onPause() {
datasource.close();
super.onPause();
}
private void showTransactionDetails(Transaction tran) {
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
if (v.getId() == R.id.transactionlist) {
menu.setHeaderTitle("Optionen ");
menu.add(Menu.NONE, DETAILS_OPTION, 0, "Details");
menu.add(Menu.NONE, DELETE_OPTION, 1, "Eintrag löschen");
}
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item
.getMenuInfo();
Transaction tran = (Transaction) transactionList
.getItemAtPosition(info.position);
switch (item.getItemId()) {
case DETAILS_OPTION:
showMsg(tran.getID() + "");
break;
case DELETE_OPTION:
try {
datasource.deleteTransaction(tran);
updateList();
showMsg("Entry deleted!");
} catch (Exception e) {
Log.i("Exception", e.getMessage());
}
break;
}
return true;
}
// Show Toast
private void showMsg(String message) {
Toast msg = Toast.makeText(getActivity(), message, Toast.LENGTH_LONG);
msg.show();
}
private void updateList() {
adapter = new CustomFinanceListAdapter(
datasource.getAllTransactions(flag), getActivity());
transactionList.setAdapter(adapter);
mCallback.onDataChanged(new Random().nextInt());
}
}
USERS_TABLE_CREATE = "CREATE TABLE "
+ TABLE_FINANCES + " (" + COLUMN_ID
+ " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," + COLUMN_DATE
+ " DATETIME NOT NULL," + COLUMN_VALUE + " REAL NOT NULL," + COLUMN_DESC
+ " NVARCHAR(255)," + COLUMN_FLAG + " NVARCHAR(1) NOT NULL);";
if (getUserVisibleHint()) {
// Handle menu events and return true
} else
return false; // Pass the event to the next fragment
}
我不明白这个问题。使用标志时，数据有什么不同？你期望不同的数据，还是相同的两倍？嗨。我将提供有关表格本身的更多信息。我有不同的数据，在两个列表视图中都正确显示。但是很明显，这两个片段或列表视图是相互“连接”的。一方面的变化对另一方面有影响。我不明白为什么会这样。看起来问题在于上下文菜单。。。。我想菜单只提到了第一个片段的列表。。。。
if (getUserVisibleHint()) {
// Handle menu events and return true
} else
return false; // Pass the event to the next fragment
}