Develop Reference

How do you delete an Item from a ListView from a dialog box class?

I made my own dialog box class. This class has a button to delete an item from a listview(which is the main acctivity_main.xml). When I push the delete button the item does not get deleted.
I have seen this topic Android: how to remove an item from a listView and arrayAdapter. It just appears the user does not know how to get the item index correctly, which I believe I have done correctly.
Remove ListView items in Android This one is pretty close. But in my code I created my own dialog, this one is using a positive and negative button. I am passing variables between my dialog class and to the mainActivity.
my onClickListener in OnCreate withing the MainActivity
mFoodDataAdapter = new FoodDataAdapter();
final ListView listFoodData = (ListView) findViewById(R.id.listView);
listFoodData.setAdapter(mFoodDataAdapter);
//Handle clicks on the ListView
listFoodData.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapter, View view, int whichItem, long id) {
FoodData tempFoodData = mFoodDataAdapter.getItem(whichItem);
//create a new dialog window
DialogShowFood dialog = new DialogShowFood();
// send in a reference to the note to be shown
dialog.sendFoodDataSelected(tempFoodData);
FoodDataAdapter adapter1 = new FoodDataAdapter();
/*this is where i send the data to the DialogShowFood.java*/
dialog.sendFoodDataAdapter(adapter1, whichItem);
// show the dialog window with the note in it
dialog.show(getFragmentManager(),"");
}
});
Here is my class for the dialog "DialogShowFood.java"
public class DialogShowFood extends DialogFragment {
FoodData mFood;
MainActivity.FoodDataAdapter mAdapter;
int mitemToDelete;
#Override
public Dialog onCreateDialog(Bundle savedInstanceState){
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View dialogView = inflater.inflate(R.layout.dialog_show_food, null);
Button btnDelete = (Button) dialogView.findViewById(R.id.btnDelete);
builder.setView(dialogView).setMessage("Your food");
/*this sends the item to delete to the adapter*/
btnDelete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
mAdapter.deleteFoodData(mitemToDelete);
dismiss();
}
});
return builder.create();
}
/*this gets the data to delete from the MainActivity*/
public void sendFoodDataAdapter(MainActivity.FoodDataAdapter adapter1, int whichItem) {
mAdapter = adapter1;
mitemToDelete = whichItem;
}
}
The function inside the adapter
/*this is the function in the base adapter to delete the item*/
public void deleteFoodData(int n){
Toast.makeText(MainActivity.this,Integer.toString(n), Toast.LENGTH_SHORT).show();
foodDataList.remove(n);
notifyDataSetChanged();
}
The Toast outputs the proper indexes of the item to delete, it just does not delete the item for some reason.

showAsDropDown but upwards like spinner

I have used popup listview to work like spinner .I want it to pop upwards like spinner does when its at the bottom of the screen .
I have tried :
popupWindowDogs.showAsDropDown(buttonShowDropDown,5,0);
ALSO,
popupWindowDogs.showAsDropDown(buttonShowDropDown, (int)(Math.round(buttonShowDropDown.getX())),-(totallinear_layouts+buttonShowDropDown.getHeight()));
totallinearlayouts = sum of all heights of linear layouts till the button.
This works properly on a few devices but not like Spinner. How can I make it to work like Spinner? I mean to inflate exactly as the size of the device and the list height. I really appreciate any help. Thanks in Advance.
Reference:https://www.codeofaninja.com/2013/04/show-listview-as-drop-down-android.html
MainActivity.java
public class MainActivity extends Activity {
String TAG = "MainActivity.java";
String popUpContents[];
PopupWindow popupWindowDogs;
Button buttonShowDropDown;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// initialize pop up window items list
// add items on the array dynamically
// format is DogName::DogID
List<String> dogsList = new ArrayList<String>();
dogsList.add("Akita Inu::1");
dogsList.add("Alaskan Klee Kai::2");
dogsList.add("Papillon::3");
dogsList.add("Tibetan Spaniel::4");
// convert to simple array
popUpContents = new String[dogsList.size()];
dogsList.toArray(popUpContents);
// initialize pop up window
popupWindowDogs = popupWindowDogs();
// button on click listener
View.OnClickListener handler = new View.OnClickListener() {
public void onClick(View v) {
switch (v.getId()) {
case R.id.buttonShowDropDown:
// show the list view as dropdown
popupWindowDogs.showAsDropDown(v, -5, 0);
break;
}
}
};
// our button
buttonShowDropDown = (Button) findViewById(R.id.buttonShowDropDown);
buttonShowDropDown.setOnClickListener(handler);
}
public PopupWindow popupWindowDogs() {
// initialize a pop up window type
PopupWindow popupWindow = new PopupWindow(this);
// the drop down list is a list view
ListView listViewDogs = new ListView(this);
// set our adapter and pass our pop up window contents
listViewDogs.setAdapter(dogsAdapter(popUpContents));
// set the item click listener
listViewDogs.setOnItemClickListener(new DogsDropdownOnItemClickListener());
// some other visual settings
popupWindow.setFocusable(true);
popupWindow.setWidth(250);
popupWindow.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);
// set the list view as pop up window content
popupWindow.setContentView(listViewDogs);
return popupWindow;
}
/*
* adapter where the list values will be set
*/
private ArrayAdapter<String> dogsAdapter(String dogsArray[]) {
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dogsArray) {
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// setting the ID and text for every items in the list
String item = getItem(position);
String[] itemArr = item.split("::");
String text = itemArr[0];
String id = itemArr[1];
// visual settings for the list item
TextView listItem = new TextView(MainActivity.this);
listItem.setText(text);
listItem.setTag(id);
listItem.setTextSize(22);
listItem.setPadding(10, 10, 10, 10);
listItem.setTextColor(Color.WHITE);
return listItem;
}
};
return adapter;
}
}
DogsDropdownOnItemClickListener.java
public class DogsDropdownOnItemClickListener implements OnItemClickListener {
String TAG = "DogsDropdownOnItemClickListener.java";
#Override
public void onItemClick(AdapterView<?> arg0, View v, int arg2, long arg3) {
// get the context and main activity to access variables
Context mContext = v.getContext();
MainActivity mainActivity = ((MainActivity) mContext);
// add some animation when a list item was clicked
Animation fadeInAnimation = AnimationUtils.loadAnimation(v.getContext(), android.R.anim.fade_in);
fadeInAnimation.setDuration(10);
v.startAnimation(fadeInAnimation);
// dismiss the pop up
mainActivity.popupWindowDogs.dismiss();
// get the text and set it as the button text
String selectedItemText = ((TextView) v).getText().toString();
mainActivity.buttonShowDropDown.setText(selectedItemText);
// get the id
String selectedItemTag = ((TextView) v).getTag().toString();
Toast.makeText(mContext, "Dog ID is: " + selectedItemTag, Toast.LENGTH_SHORT).show();
}
}

Android - spinner within dialog won't populate

I'm trying to add a two spinners inside a dialog (popup). The problem I'm having is populating the spinners. I get no error I can see, and basically the same code works if It's in a tab-fragment, and not the dialog.
This is the code that does not popluate the spinners inside the dialog.
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
League league;
league = ((LeagueMainActivity)getActivity()).getLeague();
View v = inflater.inflate(R.layout.diaglog_add_match, null);
Spinner spinner1 = (Spinner) v.findViewById(R.id.spinner_dialog_player1);
Spinner spinner2 = (Spinner) v.findViewById(R.id.spinner_dialog_player2);
String [] items = {"test 1", "test 2"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_spinner_item, items);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Log.d("Spinner: ", "" + spinner1);
spinner1.setAdapter(adapter);
spinner2.setAdapter(adapter);
builder.setView(inflater.inflate(R.layout.diaglog_add_match, null))
.setTitle("Add match")
.setPositiveButton("Create", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int id) {
// sign in the user ...
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
//LoginDialogFragment.this.getDialog().cancel();
/* do I really need to do anything??? */
}
});
AlertDialog dialog = builder.create();
return dialog;
}
This is the code that works within a (tabbed) fragment:
public class UnnamedFragment extends Fragment{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_unnamed, container, false);
Spinner spinner1 = (Spinner) rootView.findViewById(R.id.spinner);
String [] items = {"test 1", "test 2"};
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_spinner_item, items);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Log.d("Spinner: ", "" + spinner1);
spinner1.setAdapter(adapter);
return rootView;
}
}

Okay so what I did wrong was inflating/creating two independent views with the same context.
First I did:
View v = inflater.inflate(R.layout.diaglog_add_match, null);
And then:
builder.setView(inflater.inflate(R.layout.diaglog_add_match, null))
So I set the view for the builder as a new view, and not the same ones I used for the spinner.
So instead if I do:
View v = inflater.inflate(R.layout.diaglog_add_match, null);
builder.setView(v)
That does the trick.

Spinner data accept is mulfunctioning

I have a spinner which displays both options, but when I accept the female option, it still takes the answer as a male, any suggestions?
List<String> SpinnerArray = new ArrayList<String>();
SpinnerArray.add("Male");
SpinnerArray.add("Female");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, SpinnerArray);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Spinner Items = (Spinner) findViewById(R.id.genderSpinner);
Items.setAdapter(adapter);
// Importing all assets like buttons, text fields
inputFullName = (EditText) findViewById(R.id.registerName);
String selected = Items.getSelectedItem().toString();
if (selected.equals("Male")) {
inputGen = "Male";
}
if (selected.equals("Female")){
inputGen = "Female";
}

Following the official guide:
public class SpinnerActivity extends Activity implements OnItemSelectedListener {
...
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// An item was selected. You can retrieve the selected item using
// parent.getItemAtPosition(pos)
}
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
}
You can try a switch of position and then try your same conditions.

Android set position in a spinner

I want to set the position for a spinner. I have a string array for the adapter, i.e,
final String[] cat = { "Highest", "Lowest", "Most Recent"};
But I want my spinner to initially display a blank. So I tried this.
mSpinner.setSelection(-1);
But this doesn't solve my problem. Any ideas how to do this? Help is much needed and appreciated. Thanks.
UPDATE:
My code:
private void displayDialog() {
// TODO displayDialog
final ArrayAdapter<String> adp = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, sortBy);
LayoutInflater li = LayoutInflater.from(this);
View promptsView = li.inflate(R.layout.dialog_layout, null);
promptsView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
final Spinner mSpinner= (Spinner) promptsView
.findViewById(R.id.spDialog);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Sort By...");
builder.setIcon(R.drawable.launcher);
mSpinner.setAdapter(adp);
mSpinner.setSelection(-1);
mSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View v,
int pos, long id) {
strSpinner = mSpinner.getSelectedItem().toString();
if(strSpinner.equals("Highest Price")){
highest.setTypeface(Typeface.DEFAULT_BOLD);
lowest.setTypeface(Typeface.DEFAULT);
location.setTypeface(Typeface.DEFAULT);
price = dbHelper.sortHighestPrice();
adapter = new MyCustomAdapter(imgs, text, price);
lv.setAdapter(adapter);
adapter.notifyDataSetChanged();
} else if (strSpinner.equals("Lowest Price")){
highest.setTypeface(Typeface.DEFAULT);
lowest.setTypeface(Typeface.DEFAULT_BOLD);
location.setTypeface(Typeface.DEFAULT);
price = dbHelper.sortLowestPrice();
adapter = new MyCustomAdapter(imgs, text, price);
lv.setAdapter(adapter);
adapter.notifyDataSetChanged();
} else if (strSpinner.equals("Location")) {
highest.setTypeface(Typeface.DEFAULT);
lowest.setTypeface(Typeface.DEFAULT);
location.setTypeface(Typeface.DEFAULT_BOLD);
} else {
Log.d("Default", "Default");
}
}

Make your first item Blank.
final String[] cat = {"", "Highest", "Lowest", "Most Recent"};

make your first item blank and set selection of spinner by default is 0.

To set Spinner default value position to -1.
Override the Spinner Class.
that overrides the setAdapter() method.There you can set position to -1.
Please follow the link for details :
How to make an Android Spinner with initial text "Select One"