Scenario : I have 2 spinners with one adapter and global array. When any one select an item from one spinner then that item will delete from global array.Problem is when an item suppose select with 0 index again after deleting that item from global array and another item at acquire position with 0 index . If I will select that 0 index changed item then it will not select other than all items will select.
So can any one explain or suggest what i want to do in this scenario.
List<String> spinnerArray = new ArrayList<String>();
HashMap<String, String> index_val = new HashMap<String, String>();
ArrayAdapter<String> adapter_left;
spinnerArray.add("None");
spinnerArray.add("Task");
spinnerArray.add("Priority");
spinnerArray.add("Deadline");
spinnerArray.add("Assigned to");
spinnerArray.add("Created by");
spinnerArray.add("Closed by");
spinnerArray.add("Category");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(activity, R.layout.spinner_selected_item, noneArray);
adapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
adapter_left = new ArrayAdapter<String>(activity, R.layout.spinner_selected_item_left, spinnerArray);
adapter_left.setDropDownViewResource(R.layout.spinner_dropdown_item);
task_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
if(!index_val.get("1").equalsIgnoreCase("None")){
spinnerArray.add(index_val.get("1"));
}
current_selected_val = adapterView.getItemAtPosition(i).toString();
index_val.put("1", current_selected_val);
if(!current_selected_val.equalsIgnoreCase("none")) {
spinnerArray.remove(spinnerArray.indexOf(current_selected_val));
}
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
Your Array Adapter should be notify every time, when ever you modify an array list like adding, deleting or updating.
So notify your adapter.
I hope this might help you.
It's not possible, because spinner maintains their items on behalf of index instead of actual items.
Related
I have CustomAdapter which I am using for populating ListView with some data.
Each element in ListView has two variables. For each listview (in onItemClick method) I must check this variables and If they are the same - do some code and If they are different - do another code, for example Toast.makeText(EPG.this, "Variables are different", Toast.LENGTH_SHORT).show();
So I have tried this:
private List<SomeItem> items = new ArrayList();
//items were created
SomeAdapter adapter = new SomeAdapter(this, R.layout.list_item, items);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
for(int i=0; i<=items.size(); i++) {
SomeItem item = items.get(position);
String tmpCI = item.getFirstVariable();
String tmpPCI = item.getecondVariable();
if (!tmpCI.equals(tmpPCI)) {
//some code
} else {
Toast.makeText(EPG.this, "Variables are different", Toast.LENGTH_SHORT).show();
}
}
}
});
But all of my listview elements have values of the first element in those two variables.
So how can I do something like item.next(); for validating all of items in listview?
UPD:
Sorry, I will provide more information about what I am doing after checking variables of listview items for understanding my issue.
I have one more adapter:
SomeAnotherAdapter adapterPr = new SomeAnotherAdapter(this, R.layout.list_tem_another, itemsAnother);
and one more listview:
listViewAnother.setAdapter(adapterPr);
First of all I understood, that first variable should be from first listview and the second variable from another listview.
In this listViewAnother I have many items, which has some "id". For example 1st, 5th and 20th elements have id 90 and other elements have id 100.
We can say, that items from the first listview also have "id".
So I must check if(first variable = second variable) and then show in listViewAnother only items that have id which equals ID from clicked item in listView.
I tried: adapterPr.remove(item2); but then I understood, that I need all of items because I can go back to listView and press another item which will need those removed elements.
Now, hope I provided full information and you will be able to help me improve my code.
Do you need to perform the check on every element of the adapter when you click on one element of the adapter? If not, you don't need a loop. If you do, your loop should be iterating over the original list, and does not need adapter position at all.
In general when using adapters and lists, you should use the adapter's position and the adapter's data set to perform any tasks. It's not good practice to use the adapter position to get an item from the original list.
Simply set one onItemClickListener which gets the corresponding item from the adapter, and do what you need to from there:
private List<SomeItem> items = new ArrayList();
//items were created
SomeAdapter adapter = new SomeAdapter(this, R.layout.list_item, items);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
SomeItem item = adapter.getItem(position);
String tmpCI = item.getFirstVariable();
String tmpPCI = item.getecondVariable();
if (!tmpCI.equals(tmpPCI)) {
//some code
} else {
Toast.makeText(EPG.this, "Variables are different", Toast.LENGTH_SHORT).show();
}
}
});
i can't select spinner item that i received from server.
i have some Person Class objects come from server in a list of array. then i collect the names of objects from PersonList to PersonNames
personList = response.body();
for(Person p : personList){
personNames.add(p.getPersonFullName());
}
im using retrofit 2 to receive data from server.
Fortunately spinner show names (in a first look in spinner no item selected but when i press the dropdown menu the names shown all!).
But i can't select.But when i add some item manualy like PersonNames.add("Hi"); Spinner works fine and select item in offline work. But in getting data from server and turn them to another list , i can't use spinner and select item. what's going wrong?
final ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, personNames);
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerPersons.setAdapter(dataAdapter);
spinnerPersons.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
ePersonUserName.setText(personNames.get(i));
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
I want to Convert the Languages. So i am using two Spinners one is "From Language" and Another one is for "To Language". If One Language is Selected in "From Language" Spinner, it shouldn't display (or it should be disabled) in 2nd spinner. how can i achieve it?
Ex. if i Select English in 1st Spinner, 2nd Spinner Shouldn't display English in its dropdown.
This is may not be the best way try this.
ArrayList<String> languages = new ArrayList<>();
languages.add("English");
languages.add("Hindi");
languages.add("Telugu");
languages.add("Tamil");
languages.add("Kannada");
languages.add("Malayalam");
// make a array list of languages
String option1 = null;
Spinner spinnerOption1 = (Spinner) findViewById(R.id.spinner1);
final ArrayAdapter<String> adapterOpton1 = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_item, languages);
spinnerOption1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerOption1.setAdapter(adapterOpton1);
spinnerOption1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
option1 = adapterOpton1.getItem(position);
}
});
int selectedIndex;
for (String item : languages) {
if (item.equals(option1)) {
selectedIndex == languages.indexOf(item);
}
}
ArrayList<String> languages2 = languages;
languages2.remove(selectedIndex);
Spinner spinnerOption2 = (Spinner) findViewById(R.id.spinner2);
final ArrayAdapter<String> adapterOption2 = new ArrayAdapter<String>(getContext(), android.R.layout.simple_spinner_item, languages2);
spinnerOption2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerOption2.setAdapter(adapterOption2);
Explanation:
lets create a arraylist with languages
bind it to the adapter on the spinner, on selection to the spinner one keep a track of that selection, then find the index of the selection in the arraylist.
create second arraylist with the same languages and find and remove the user selected item, create an adapter and bind the data.
Hope it helps.
Use Hashmaps it will be easier. Create an Adapter that uses Key Values for populating adapter.
This is a snippet I found from another link on how to do that, in case you are not familiar
public class HashMapAdapter extends BaseAdapter {
private HashMap<String, String> mData = new HashMap<String, String>();
private String[] mKeys;
public HashMapAdapter(HashMap<String, String> data){
mData = data;
mKeys = mData.keySet().toArray(new String[data.size()]);
}
#Override
public int getCount() {
return mData.size();
}
#Override
public Object getItem(int position) {
return mData.get(mKeys[position]);
}
#Override
public long getItemId(int arg0) {
return arg0;
}
#Override
public View getView(int pos, View convertView, ViewGroup parent) {
String key = mKeys[pos];
String Value = getItem(pos).toString();
//do your view stuff here
return convertView;
}
}
Credit What adapter shall I use to use HashMap in a ListView
Now for your management of the adapters.
LanguageOneMap.put (all your keys 0-whatever) value (english-whatever)
LanguageTwoMap.put (same as above)
LanguageAllMap.put (same as above)
Adapter 1 selects Language Callback(languageSelectedFromOneKey){
LanguageTwoMap.clearAll
LanguageTwoMap.put (all again)
LanguageTwoMap.remove(languageSelectedFromOneKey)
LanguageTwoAdapter.notifyDataSetChanged()
}
The above is just pseudo code meant to give the idea, not exact copy and paste. Hope that is enough to get you going. There are many ways to skin this cat, you could even use the same list for both adapters. Then when one is selected from one or the other, set a property of "selectedOtherLanguage" in the opposite adapter, then in the GetView method if data.get(pos) == selectedFromOtherListItem return, don't draw.
Many ways to do this, just a matter of how you want to do it. Goodluck.
Using the following code, when an item from the list is selected it updates a data table. The problem is when there are several items listed, regardless of which one is selected, it always updates the first listed item showing rather than the one selected. Thanks in advance!
Edited-Updated. Incorporated (position) and tried to simplify a bit of the code. Still will not capture the selected item, always returns the top item showing on the listview, regardless. The DB controller is working fine, all else is good except this...
setContentView(R.layout.list_messages);
ArrayList<HashMap<String, String>> phraseList = controller
.getUnreadMessage();
ListView lv = getListView();
ListAdapter adapter = new SimpleAdapter(
ReadUnReadMessages.this,
phraseList,
R.layout.view_list_messages,
new String[] { "mFromName", "mToAddress", "mBody",
"mToName", "messageTime", "mFromAddress", "mRead",
"messageId" },
new int[] { R.id.messageFrom, R.id.messageToAdd,
R.id.messageBody, R.id.messageTo, R.id.messageTime,
R.id.messageFromAdd, R.id.readCode, R.id.messageId });
setListAdapter(adapter);
lv.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long arg) {
#SuppressWarnings("unchecked")
HashMap<String, String> queryValues = (HashMap<String, String>)parent.getItemAtPosition(position);
messageBody = (TextView) findViewById(R.id.messageBody);
readCode = (TextView) findViewById(R.id.readCode);
messageId = (TextView) findViewById(R.id.messageId);
String readCode = "1";
queryValues
.put("messageId", messageId.getText().toString());
queryValues.put("mRead", readCode);
queryValues.put("mBody", messageBody.getText().toString());
controller.markMessage(queryValues);
this.callSplash(view);
}
public void callSplash(View view) {
Intent objSplash = new Intent(getApplicationContext(),
Splash.class);
startActivity(objSplash);
}
});
It's hard to tell exactly how you were expecting it to work, but it seems like your central problem is that you are ignoring the 'position' parameter to onItemClick. This is Android's way of telling you which item was clicked. Somehow you need to pass that parameter, or else the corresponding item object that you fetch first from the adapter, on to the functions you call from onItemClick:
this.insertData(position);
Otherwise those functions would have to guess which item was clicked. And apparently that is what they are doing: they are assuming the first item was clicked.
if i have 2 spinner the second depend in the first
i will retriever the info of the second spinner from MySQL database depend in the choose of first spinner i succuflly get the id of the first spinner but i do not
how to send it to the other cause it not work with me
i have class MainActivity that have:
new LoadAllCourses().execute(); //first spinner generation
new LoadAllSection().execute(); //second spinner
in class LoadAllCourses extends AsyncTask<String, String, String>
adapter1 = new MyCustomAdapter(MainActivity.this,
android.R.layout.simple_spinner_item,
coursesList);
spinner1.setAdapter(adapter1); // Set the custom adapter to the spinner
spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position, long id) {
HashMap<String, String> map12 = coursesList.get(position);
String id3 = map12.get("CourseID");
// Do something
Log.d("All coursesdddddddddddddddddddddddddddddddddddd: ", id3);
// Do something
}
#Override
public void onNothingSelected(AdapterView<?> adapter) {
}
});
now i want to get the id3 and send it to
class LoadAllSection extends AsyncTask<String, String, String>
but it is not work
how can i solve it if i have as i said
If I have understood your question, you require the selection on the first spinner to for the basis of a search from a database to populate the second spinner.
If in adapter 1 (adapter1 = new MyCustomAdapter(MainActivity.this,
android.R.layout.simple_spinner_item,
coursesList);) courseList is an array, one can get the selected item from the spinner in the setOnItemSelectedListeneras follows courseList [position].
Having obtained the selected item, you then require a function to perform the query in the database, say load_all_selection(courseList [position]) which should return an array of results from your database.
Since it returns an array you can define adapter 2 as follows
adapter2 = new MyCustomAdapter(MainActivity.this,
android.R.layout.simple_spinner_item,
load_all_selection(courseList [position]));
and assign it to the second spinner spinner2.setAdapter(adapter2);
All this can be done from within the setOnItemSelectedListener part, except maybe for the definition of the load_all_selection(...) function.
I hope I understood you question and this helps. If it doesn't you can still look around for a different solution.