问题
i am creating an applicaiton with different fragments. I want to add code to listener for back key event and confirm with user if he wants to exit the app or not..
public class FastivalesFragment extends Fragment {
public FastivalesFragment(){
}
CustomAdapter adapter;
List<EventClass> tempRows = new ArrayList<EventClass>();
EditText searchTxt;
ListView list;
View view;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.d("LifeCycle now is", "onCreateView");
// searchTxt = (EditText)view.findViewById(R.id.inputSearch);
tempRows.clear(); // to delete all objects form temp array
view = inflater.inflate(R.layout.events_list, container, false);
list = (ListView) view.findViewById(R.id.listView1);
int j=0;
while (AllEventsFragment.rowItems.size() > j){
Log.d(" the value for region ", "is "+ AllEventsFragment.rowItems.get(j).getCategory());
if (AllEventsFragment.rowItems.get(j).getCategory().equals("أخرى")) {
tempRows.add(AllEventsFragment.rowItems.get(j));
}
j++;
}
adapter = new CustomAdapter(getActivity(),R.layout.item_view,tempRows);
list.setAdapter(adapter);
//list.setTextFilterEnabled(true);
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
//Log.e("value of name ", " "+ arg2);
String name = tempRows.get(arg2).getName();
String details = tempRows.get(arg2).getDetails();
String ticketPrice = tempRows.get(arg2).getTicketPrice();
String boolingUrl = tempRows.get(arg2).getBookingUrl();
Log.e("sdate", " "+ sdate);
Intent i = new Intent (getActivity(), Event_details.class);
i.putExtra("name", name);
i.putExtra("details", details);
i.putExtra("sdate", sdate);
i.putExtra("edate", edate);
i.putExtra("time", time);
i.putExtra("boolingUrl", boolingUrl);
startActivity(i);
//Toast.makeText(MainActivity.this,"test",Toast.LENGTH_SHORT).show();
//Log.e("position"," "+ arg2);
}
});
return view;
}
//onCreate method
@Override
public void onCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Log.d("LifeCycle now is", "onCreate");
} // end of Attach
//onPause() method
@Override
public void onPause(){
super.onPause();
//rowItems.clear(); // to delete all objects form temp array
Log.d("LifeCycle now is", "onPause()");
} // end of onPause
//onResume() method
@Override
public void onResume(){
super.onResume();
Log.d("LifeCycle now is", "onResume()");
} // end of onResume
}
I used the following code for activity and it works fine.. but it does not work the fragment file above.
// confirm when user click back key
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode != KeyEvent.KEYCODE_BACK) return super.onKeyDown(keyCode, event);
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
//Yes button clicked
finish();
break;
case DialogInterface.BUTTON_NEGATIVE:
//No button clicked
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(this)
.setMessage("Are you sure?")
.setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener)
.setCancelable(false)
.setTitle("Exit");
builder.show();
return super.onKeyDown(keyCode, event);
}
when i copy this code the above fragment .. i got error of : The method onKeyDown is undefiled for type Fragment..
回答1:
I have solved the issue by adding the above code in the Main Activity not in each Fragment. Thanks Alls
来源：https://stackoverflow.com/questions/26850104/how-to-confirm-quit-application-in-fragment-when-user-press-back-key