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我有一個列表視圖，其中包含存儲在數據庫中的項目。當每個項目被點擊時，會彈出一個對話框片段，其中包含用於編輯和刪除的按鈕。點擊刪除時，該項目將從數據庫中刪除，對話框片段將被解除。但是，在列表視圖所在的主要活動中，數據不會更新。它仍然顯示我刪除的項目。有些人可以幫忙嗎？如何在關閉對話框片段後從數據庫刷新listview？
下面是代碼段：
/******* MainActivity *********/
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private ListView taskListView;
private DataModel data;
private DatabaseHandler db = new DatabaseHandler(this);
private SimpleCursorAdapter adapter;
private Cursor cursor;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
taskListView = (ListView) findViewById(R.id.task_list_view);
refreshListView();
}
private void showPopupDialog(String[] taskDetails) {
FragmentManager fm = getSupportFragmentManager();
PopupFragment pf = PopupFragment.newInstance(taskDetails);
pf.show(fm,"activity_popup_fragment");
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
int currentPosition;
super.onCreateContextMenu(menu, v, menuInfo);
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.context_menu, menu);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
switch (item.getItemId()) {
case R.id.edit:
Toast.makeText(this,"Task Completed",Toast.LENGTH_LONG).show();
return true;
case R.id.delete:
Toast.makeText(this,"Task Deleted",Toast.LENGTH_LONG).show();
db.deleteTask((int)info.id);
refreshListView();
return true;
default:
return super.onContextItemSelected(item);
}
}
protected void refreshListView() {
cursor = db.queueAllTasks();
String[] from = new String[] {"taskName","taskDesc","taskDate","taskTime","id"};
int[] to = new int[] {R.id.text};
adapter = new SimpleCursorAdapter(this, R.layout.row_item, cursor, from, to);
taskListView.setAdapter(adapter);
taskListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Cursor cursor = (Cursor) taskListView.getItemAtPosition(i);
String taskDetails[] = {cursor.getString(cursor.getColumnIndexOrThrow("taskName")),
cursor.getString(cursor.getColumnIndexOrThrow("taskDesc")),
cursor.getString(cursor.getColumnIndexOrThrow("taskDate")),
cursor.getString(cursor.getColumnIndexOrThrow("taskTime")),
cursor.getString(cursor.getColumnIndexOrThrow("id"))};
showPopupDialog(taskDetails);
}
});
registerForContextMenu(taskListView);
}
/********* ** PopupFragment ***********/
public class PopupFragment extends DialogFragment {
TextView name, desc, reminder;
String remindAt;
Button delBtn, editBtn;
DatabaseHandler db;
public PopupFragment() {
}
public static PopupFragment newInstance(String[] taskDetails) {
PopupFragment frag = new PopupFragment();
Bundle args = new Bundle();
args.putString("TaskName", taskDetails[0]);
args.putString("TaskDesc", taskDetails[1]);
args.putString("TaskDate", taskDetails[2]);
args.putString("TaskTime", taskDetails[3]);
args.putInt("TaskId", Integer.parseInt(taskDetails[4]));
frag.setArguments(args);
return frag;
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.activity_popup_fragment,container);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
name = (TextView) view.findViewById(R.id.popTaskName);
desc = (TextView) view.findViewById(R.id.popTaskDesc);
delBtn = (Button) view.findViewById(R.id.del_btn);
editBtn = (Button) view.findViewById(R.id.edit_btn);
reminder = (TextView) view.findViewById(R.id.popTaskRemind);
db = new DatabaseHandler(getActivity());
remindAt = "Remind me on "+getArguments().getString("TaskDate") +" at "+ getArguments().getString("TaskTime");
name.setText(getArguments().getString("TaskName"));
desc.setText(getArguments().getString("TaskDesc"));
reminder.setText(remindAt);
delBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
db.deleteTask(getArguments().getInt("TaskId"));
getDialog().dismiss();
Toast.makeText(getContext(),"Task Deleted",Toast.LENGTH_LONG).show();
}
});
editBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getContext(),EditTask.class);
intent.putExtra("TaskId", getArguments().getInt("TaskId"));
intent.putExtra("TaskName", getArguments().getString("TaskName"));
intent.putExtra("TaskDesc", getArguments().getString("TaskDesc"));
intent.putExtra("TaskDate", getArguments().getString("TaskDate"));
intent.putExtra("TaskTime", getArguments().getString("TaskTime"));
startActivity(intent);
}
});
}
在此先感謝！
謝謝..它的工作。我試圖早些時候實施相同的想法，但可能以錯誤的方式實施！乾杯! –
@AtulRauthan很高興聽到！請接受答案，以便可以關閉問題 – Pooya
完成。謝了哥們！ –