我有一个显示Fragment的{{1}}，其Listview使用Database填充了条目。我目前有SQLiteOpenHelper，允许删除或编辑条目。 ContextMenu选项用于运行DELETE中的条目，但Database选项仅接受EDIT中输入的字段，并向{{1}添加新条目}}。我希望能够将对话框提供的值归因于Dialog中已存在的条目。提前感谢任何意见或建议。
片段：
ListView数据库：
DatabaseLiftSave：
public static class FragmentS extends Fragment {
private ListView saveListView;
private List<LiftSave> LiftSaves = new ArrayList<LiftSave>();
private static final int EDIT = 0, DELETE = 1;
LiftSave longClickedItemLiftSave;
DatabaseHandler dbHandler;
ArrayAdapter<LiftSave> saveAdapter;
public FragmentS() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.listview_s,
container, false);
saveListView = (ListView) rootView.findViewById(R.id.saveListView);
registerForContextMenu(saveListView);
DatabaseHandler dbHandler;
dbHandler = new DatabaseHandler (getActivity().getApplicationContext());
if (dbHandler.getLiftSavesCount() != 0)
LiftSaves.addAll(dbHandler.getAllLiftSaves());
populateList();
saveListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
longClickedItemLiftSave = (LiftSave) parent.getItemAtPosition(position);
return false;
}
});
return rootView;
}
private void populateList() {
saveAdapter = new SaveListAdapter();
saveListView.setAdapter(saveAdapter);
}
public class SaveListAdapter extends ArrayAdapter<LiftSave> {
public SaveListAdapter() {
super(getActivity(), R.layout.listview_item, LiftSaves);
}
@Override
public View getView(int position, View view, ViewGroup parent) {
if (view == null)
view = getActivity().getLayoutInflater().inflate(R.layout.listview_item, parent, false);
LiftSave currentLiftSave = LiftSaves.get(position);
TextView liftName = (TextView) view.findViewById(R.id.liftName);
liftName.setText(currentLiftSave.getLiftName());
TextView maxValue = (TextView) view.findViewById(R.id.maxValue);
maxValue.setText(currentLiftSave.getMaxValue());
TextView liftNotes = (TextView) view.findViewById(R.id.liftNotes);
liftNotes.setText(currentLiftSave.getLiftNotes());
TextView weightAndReps = (TextView) view.findViewById(R.id.weightAndReps);
weightAndReps.setText(currentLiftSave.getRepsAndWeight());
TextView date = (TextView) view.findViewById(R.id.todayDate);
date.setText(currentLiftSave.getTodayDate());
return view;
}
}
public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, view, menuInfo);
menu.setHeaderIcon(R.drawable.pencil_icon);
menu.setHeaderTitle("Save Options");
menu.add(Menu.NONE, EDIT, menu.NONE, "Edit Save");
menu.add(Menu.NONE, DELETE, menu.NONE, "Delete Save");
}
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case EDIT:
final View dialogViewEdit = LayoutInflater.from(this.getActivity()).inflate(R.layout.edit_save, null, false);
final AlertDialog builderE = new AlertDialog.Builder(this.getActivity()).create();
TextView liftName = (TextView) getActivity().findViewById(R.id.liftName);
TextView maxValue = (TextView) getActivity().findViewById(R.id.maxValue);
TextView weightAndReps = (TextView) getActivity().findViewById(R.id.weightAndReps);
TextView liftNotes = (TextView) getActivity().findViewById(R.id.liftNotes);
TextView date = (TextView) getActivity().findViewById(R.id.todayDate);
final EditText editName = (EditText) dialogViewEdit.findViewById(R.id.liftNameED);
editName.setText(liftName.getText().toString());
EditText editNotes = (EditText) dialogViewEdit.findViewById(R.id.liftNotesED);
editNotes.setText(liftNotes.getText().toString());
EditText editWR = (EditText) dialogViewEdit.findViewById(R.id.txtWRED);
editWR.setText(weightAndReps.getText().toString());
EditText editMax = (EditText) dialogViewEdit.findViewById(R.id.txtMaxED);
editMax.setText(maxValue.getText().toString());
EditText editDate = (EditText) dialogViewEdit.findViewById(R.id.txtDateED);
editDate.setText(date.getText().toString());
Button cancel =(Button) dialogViewEdit.findViewById(R.id.btnCancel);
Button save =(Button) dialogViewEdit.findViewById(R.id.btnSave);
cancel.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
builderE.dismiss();
}
});
save.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
final EditText editName = (EditText) dialogViewEdit.findViewById(R.id.liftNameED);
EditText editNotes = (EditText) dialogViewEdit.findViewById(R.id.liftNotesED);
EditText editWR = (EditText) dialogViewEdit.findViewById(R.id.txtWRED);
EditText editMax = (EditText) dialogViewEdit.findViewById(R.id.txtMaxED);
EditText editDate = (EditText) dialogViewEdit.findViewById(R.id.txtDateED);
//Problem
dbHandler = new DatabaseHandler(getActivity().getApplicationContext());
LiftSave liftSave = new LiftSave(dbHandler.getLiftSavesCount(), String.valueOf(editName.getText()), String.valueOf(editMax.getText()), String.valueOf(editNotes.getText()), String.valueOf(editWR.getText()), String.valueOf(editDate.getText()));
LiftSaves.add(liftSave);
dbHandler.getLiftSave(longClickedItemLiftSave.getId());
dbHandler.updateLiftSave(longClickedItemLiftSave);
saveAdapter.notifyDataSetChanged();
//Problem
}
});
builderE.setView(dialogViewEdit);
builderE.show();
break;
case DELETE:
AlertDialog.Builder builder = new AlertDialog.Builder(this.getActivity());
builder.setMessage("Are you sure you want to delete this save?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dbHandler = new DatabaseHandler(getActivity().getApplicationContext());
dbHandler.deleteLiftSave(longClickedItemLiftSave);
saveAdapter.remove(longClickedItemLiftSave);
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog dialogD = builder.create();
dialogD.show();
break;
}
return super.
onContextItemSelected(item);
}
}
答案 0 :(得分：1)
编辑：在我看到你的LiftSave课程后解决它的一种方法。
使用此修复程序，您根本不必修改DatabaseHandler类：
//Problem
dbHandler = new DatabaseHandler(getActivity().getApplicationContext());
//pass in the existing ID instead of dbHandler.getLiftSavesCount()
LiftSave liftSave = new LiftSave(longClickedItemLiftSave.getId() , String.valueOf(editName.getText()), String.valueOf(editMax.getText()), String.valueOf(editNotes.getText()), String.valueOf(editWR.getText()), String.valueOf(editDate.getText()));
//LiftSaves.add(liftSave); //Don't add to the list here
//dbHandler.getLiftSave(longClickedItemLiftSave.getId()); //looks like this is not needed
//pass in the LiftSave object with existing ID and new values
dbHandler.updateLiftSave(liftSave);
LiftSaves.clear(); //Remove all entries from the list
LiftSaves.addAll(dbHandler.getAllLiftSaves()); //Re-add all records to List including modified entry
saveAdapter.notifyDataSetChanged();
//Problem
请注意，longClickedItemLiftSave.getId()作为新id的{{1}}传入，因此当您将其传递到LiftSave时，它会更新原始条目。
最初提出的解决方案，另一种解决方法：
首先，让您的updateLiftSave()方法以updateLiftSave()为参数，并使用id更新记录：
id然后，在更新时，使用原始public int updateLiftSave(LiftSave liftSave, int id) {
SQLiteDatabase db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_LIFTNAME, liftSave.getLiftName());
values.put(KEY_MAXVALUE, liftSave.getMaxValue());
values.put(KEY_LIFTNOTES, liftSave.getLiftNotes());
values.put(KEY_REPSANDWEIGHT, liftSave.getRepsAndWeight());
values.put(KEY_TODAYDATE, liftSave.getTodayDate());
//int rowsAffected = db.update(TABLE_SAVES, values, KEY_ID + "=?", new String[] { String.valueOf(liftSave.getId()) });
int rowsAffected = db.update(TABLE_SAVES, values, KEY_ID + "=?", new String[] { String.valueOf(id) });
db.close();
return rowsAffected;
}
和新值：
id更新：您可能还需要添加一个调用来清除 //Problem
dbHandler = new DatabaseHandler(getActivity().getApplicationContext());
LiftSave liftSave = new LiftSave(dbHandler.getLiftSavesCount(), String.valueOf(editName.getText()), String.valueOf(editMax.getText()), String.valueOf(editNotes.getText()), String.valueOf(editWR.getText()), String.valueOf(editDate.getText()));
//LiftSaves.add(liftSave); //don't add it do the list
//dbHandler.getLiftSave(longClickedItemLiftSave.getId()); //looks like this is not needed
dbHandler.updateLiftSave(liftSave, longClickedItemLiftSave.getId()); //pass in the new values and the existing ID
LiftSaves.clear(); //Remove all entries from the list
LiftSaves.addAll(dbHandler.getAllLiftSaves()); //Re-add all records to List including modified entry
saveAdapter.notifyDataSetChanged();
//Problem
中的列表，以确保您永远不会在列表中获得重复的条目，并且列表始终镜像当前数据库中的条目：
onCreateView()更新2：关于您的上一期，请尝试使用@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//........
if (dbHandler.getLiftSavesCount() != 0){
LiftSaves.clear(); //Clear the list just in case
LiftSaves.addAll(dbHandler.getAllLiftSaves());
}
列表而不是LiftSaves AdapterView：
parent