Develop Reference

Change values of predefined Items in Multichoice AlertDialog

I have been trying to implement a multichoice alertdialog and for the most part everything is clear and understandable but the alertdialog gets the state of the items from a boolean array and all the items are set as true. I can't quite work out how I could change the state of an item in the array if it is checked in the alertdialog.
private void showCategorySelectionDialog() {
// Prepare the dialog by setting up a Builder.
final String selectionTitle = "Show on map: ";
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle(selectionTitle);
final String[] categories = new String[]{"Camping grounds","Abandoned places","Nature areas","Lookout Points"};
// Find the current map type to pre-check the item representing the current state.
boolean[] checkedItems = new boolean[]{
true,
true,
true,
true
};
// Add an OnClickListener to the dialog, so that the selection will be handled.
builder.setMultiChoiceItems(
categories,
checkedItems,
new DialogInterface.OnMultiChoiceClickListener() {
#Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
//check which item is clicked and if it was true then set it as false.
if (isChecked && checkedItems[which] == true){
checkedItems[which]= false;
}else{
//If item was clicked and the value was false then set it as true.
checkedItems[which] = true;
}
}
}
);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
// Build the dialog and show it.
AlertDialog categoryDialog = builder.create();
categoryDialog.setCanceledOnTouchOutside(true);
categoryDialog.show();
}
This current solution does not change values and my assumptions are that I am handling the Array in an incorrect way but I am not sure how the right way would be.

Since you want to change the value for an element in the array when it was checked then you can try to set the value to be equal with the isChecked variable that is passed through onClick() method.
Check the code below:
// Add an OnClickListener to the dialog, so that the selection will be handled.
builder.setMultiChoiceItems(
categories,
checkedItems,
new DialogInterface.OnMultiChoiceClickListener() {
#Override
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
checkedItems[which] = isChecked;
}
}
);

Cannot Sucessfully Delete Item From ListView In Set Counterpart

I feel like this shouldn't be a complicated problem, but I've tried reworking it and cannot think of a solution as to why it isn't working.
I have a listView that adds a ArrayList notes to it. For this listView, when you longpress on an item, it creates a pop up that deletes the item clicked. my set notesSet takes data from sharedPreferences and adds it to notes and gets updated when notes changes. This deletion is controlled by a Yes/No box. For some reason, I cannot remove the item from notes and have the listView show the updated form.
Here is the code for the long click:
myPref.edit().putStringSet("NN", notesSet).apply();
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {
new AlertDialog.Builder(Schedule.this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Pop Up!")
.setMessage("Ready to delete this task?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
SharedPreferences myPref = Schedule.this.getSharedPreferences("com.example.jackson.collegeplanner", Context.MODE_PRIVATE);
Set<String> notesSet = new HashSet<String>(myPref.getStringSet("NN", null));
ArrayAdapter arrayAdapter = new ArrayAdapter(Schedule.this, android.R.layout.simple_list_item_1, notes);
ListView listView = (ListView) findViewById(R.id.listView);
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
notesSet.remove(i);
notes.clear();
notes.addAll(notesSet);
myPref.edit().putStringSet("NN", notesSet).apply();
listView.setAdapter(arrayAdapter);
/*
notes.remove(i);
notesSet.addAll(notes);
notes.clear();
*/
}
})
.setNegativeButton("No", null).show();
return false;
}
});
I've actually pinpointed the problem, I think, to these three lines of code. Problem is, I can't figure out what it is I'm doing
notesSet.remove(i);
notes.clear();
notes.addAll(notesSet);

Actually it is a simple mistake, instead of passing String value to notesSet.remov(), you are passing integer value to it.
So make change like this
notesSet.remove(i)
to
notesSet.remove(notes(i))

How to set checkbox checked and disabled

I have this code for showing list of languages for download:
public void onCreateDialog(ArrayList<String>fullLangArray, final ArrayList<String>codeLangArray) {
final String[] items = fullLangArray.toArray(new String[fullLangArray.size()]);
final ArrayList mSelectedItems = new ArrayList();
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
// Set the dialog title
builder.setTitle("Updates...")
.setMultiChoiceItems(items, null,
new DialogInterface.OnMultiChoiceClickListener() {
#Override
public void onClick(DialogInterface dialog, int indexSelected,
boolean isChecked) {
if (isChecked) {
mSelectedItems.add(Utils.SERVER_ADDRESS + "/" + codeLangArray.get(indexSelected) + ".zip");
} else if (mSelectedItems.contains(indexSelected)) {
mSelectedItems.remove(Integer.valueOf(indexSelected));
}
}
})
.setPositiveButton("Download", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int id) {
DownloadTask downloadTask = new DownloadTask(MainActivity.this);
downloadTask.execute(mSelectedItems.toString());
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int id) {
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
I want to make a one item of a checkbox is checked and "disabled" like in a photo (Option 3) when AlertDialog is loaded.
Can you help me how to do it?

You can check the checkbox by using the setChecked() method which boolean value as parameter.
Example:
option1.setChecked(true);
and also uncheck it using
option2.setChecked(false);
If you want to set it to checked and disabled you have use setEnabled() which takes boolean as it's parameters.
Example.
option3.setChecked(true);
option3.setEnabled(false);
This will disable your checkbox and even check it. I hope this was helpful. ThankYou.

For setting Opacity
mSelectedItems.getBackground().setAlpha(128);
Where the INT ranges from 0 (fully transparent) to 255 (fully opaque).
For setChecked item
mSelectedItems.setChecked(true);
Disable checking
mSelectedItems.setEnabled(false)

How should I return to a previous dialog from another one?

I've got an inputDialog, which allows for some text inputs. On clicking save, the inputDialog checks if the entered text is already available (to prevent double entries). If this is the case, a new AlertDialog is created, simply stating "The value you entered already exists", with just an "Ok" button to dismiss this AlertDialog. This all works.
I would like to have the inputDialog pop back up again, after dismissing the AlertDialog, with the values that were entered by the user before still in the editText fields.
I'm not expecting any problems on getting those values back in the editText fields (Store them in a variable on clicking save, if the double entry error occurs, set those variables on the editText's. If I'm doing this in a stupid way, please let me know).
I am however having trouble with getting the first (inputDialog) dialog to come back. The code you see below is the code for my inputDialog fragment (The code is simplified, so if something seems to be missing, it probably is. Let me know, so I can add it back in.)
So, to repeat myself: How can I return to the previous dialog after dismissing the second one?
StuffManagerInputDialogFragment.java:
public class StuffManagerInputDialogFragment extends DialogFragment {
EditText nameInputField;
EditText tagInputField;
DBHandler dbHandler;
StuffManagerFragment f = new StuffManagerFragment();
#Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
final View v_iew = inflater.inflate(R.layout.fragment_inputdialog, null);
nameInputField = (EditText) v_iew.findViewById(R.id.inputdialogname);
tagInputField = (EditText) v_iew.findViewById(R.id.inputdialogtag);
dbHandler = new DBHandler(getActivity(), null, null, 1);
final MainActivity ma = (MainActivity) getActivity();
final AlertDialog.Builder newLinkDialog = new AlertDialog.Builder(getActivity());
newLinkDialog.setView(v_iew)
.setTitle("New Link")
.setPositiveButton("Save", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
String nameInputFieldText = nameInputField.getText().toString();
String tagInputFieldText = tagInputField.getText().toString();
ArrayList<String> nameArray = dbHandler.nameArrayMethod();
ArrayList<String> tagArray = dbHandler.tagArrayMethod();
NavigationView navigationView = (NavigationView) getActivity().findViewById(R.id.nav_view);
Menu menu = navigationView.getMenu();
if (nameArray.contains(nameInputFieldText) || tagArray.contains(tagInputFieldText)) {
if (nameArray.contains(nameInputFieldText) && tagArray.contains(tagInputFieldText)) {
AlertDialog.Builder errorBoth = new AlertDialog.Builder(getActivity())
.setTitle("Error")
.setMessage("The name and tag you entered are already in use.")
.setIcon(R.drawable.ic_error_black)
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
//Return to previous dialog here
}
});
errorBoth.show();
}
} else {
dbHandler.addLink(nameInputFieldText, tagInputFieldText);
nameArray = dbHandler.nameArrayMethod();
int nameArraySize = (nameArray.size() - 1);
MenuItem item = menu.add(R.id.group1, nameArraySize, 1, nameArray.get(nameArraySize));
Toast.makeText(getContext(), "'" + nameInputFieldText + " - " + tagInputFieldText + "' link saved.", Toast.LENGTH_SHORT).show();
ma.addSMVFFragments();
f.hideDeleteAllButton = false;
getActivity().invalidateOptionsMenu();
}
}
})
.setNegativeButton("Cancel", null);
return newLinkDialog.create();
}
}

A better solution is to have a dialog fragment for your input layout, and that dialog fragment would display an AlertDialog on OK if the text validation fails. The input dialog fragment would not dismiss in this case, it will remain in the background so when you dismiss the alert dialog to tell the user the input is invalid, you return to the input dialog as it was.
To prevent the dialog fragment from dismissing on OK you would override onStart and get a reference to the OK button and set the listener there, like this:
#Override
public void onStart() {
super.onStart();
AlertDialog alertDialog = (AlertDialog) getDialog();
if (alertDialog != null) {
mOKButton = alertDialog.getButton(AlertDialog.BUTTON_POSITIVE);
mOkButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (field OK) {
// save data
dismiss();
} else {
// show error dialog
}
}
});
}
}

Parse XML and display it in an AlertDialog in Android

I have this .xml file with countries and their countrycodes in them. This is how it looks like:
<?xml version="1.0" encoding="UTF-8"?>
<landen>
<land>
<naam>Afghanistan</naam>
<code>AF</code>
</land>
<land>
<naam>Albani�</naam>
<code>AL</code>
</land>
<land>
<naam>Algerije</naam>
<code>DZ</code>
</land>
<land>
</landen>
Now I want people to choose one country out of an list. I though an AlertDialog would be nice to display everything.
The way i get the values out of my xml-file is like this:
protected ArrayList<Land> getLanden() {
ArrayList<Land> lijst = new ArrayList<Land>();
try {
DocumentBuilder builder =DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document doc = builder.parse(getAssets().open("landenlijst.xml"));
NodeList nl = doc.getElementsByTagName("land");
for (int i=0;i<nl.getLength();i++) {
Node node = nl.item(i);
Land land = new Land();
land.land = Xml.innerHtml(Xml.getChildByTagName(node, "naam"));
land.landcode = Xml.innerHtml(Xml.getChildByTagName(node, "code"));
lijst.add(land);
}
Log.d("Gabug","Klaar met parsen");
Log.d("Gabug","Landen: " + lijst);
} catch (Exception e) {
e.printStackTrace();
}
return lijst;
}
And I use this to make my AlertDialog:
public void KiesLandMenu(){
ArrayList<Land> alleLanden = getLanden();
final CharSequence[] items = alleLanden.toArray(new CharSequence[alleLanden.size()]);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Kies land");
builder.setItems(items, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
switch (item){
case 0:
break;
case 1:
break;
case 2:
break;
}
}
});
AlertDialog alert = builder.create();
alert.show();
}
I don't know if this works as DDMS returns some bytecode or something when i Log it. And after that it Force Closes because of ArrayStoreException..
Now my question is; is this the best way to do this? if yes, how can I fix the ArrayStoreException? If no, what are better ways to let my user choose a country (a whole new view maybe)?
Furthermore, how can I register what country someone tapped?
EDIT:
I slightly changed the sample code below and I get an NullPointerException now..
public void KiesLandMenu(){
ArrayAdapter<Land> arrAdapter;
ArrayList<Land> alleLanden = getLanden();
arrAdapter = new ArrayAdapter<Land>(this, android.R.layout.simple_list_item_single_choice, alleLanden);
ListView list = (ListView)findViewById(R.layout.lijstview);
list.setAdapter(arrAdapter);
list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> list, View view, int position,
long id) {
Log.e("item clicked", String.valueOf(position));
}
});
}
The NullPointerException is at list.setAdapter(arrAdapter);

Make a layout with a ListView, then set that layout in your onCreate. To make the list, you can do something like:
public class RunTestProject extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main); //whatever you want your layout to be
}
// getLanden() implementation goes here
public void KiesLandMenu(){
ArrayList<Land> alleLanden = getLanden();
arrAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, alleLanden);
Dialog dialog = new Dialog(this);
dialog.setTitle("Kies land");
dialog.setContentView(R.layout.withList); // The dialog layout
ListView list = (ListView) dialog.findViewById(android.R.id.list); //note that it's not simply findViewById
list.setAdapter(arrAdapter);
list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
list.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> list, View view, int position,
long id) {
Log.e("item clicked", String.valueOf(position));
}
});
dialog.show();
}
}
When the user chooses on an item, you can see in the log that the item's position in the array is shown.
Your layout file can be something like:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ListView android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="0dip"
android:layout_weight="1"
/>
</LinearLayout>

You could probably extend AlertDialog and give it a ListView as a view. Then bind the ListView to an ListAdapter which uses your ArrayList.
Edit:
ListView lv = new ListView(context);
ArrayAdapter aa = new ListAdapter(context, viewid, lijst);
lv.setAdapter(aa);
AlertDialog ad = new AlertDialog(context);
ad.setView(lv);
There is a bit more work than that though. You need to specify viewid which is the View representing each item in the ListView.
The sdk reference is very good you know.

new AlertDialog.Builder(this)
.setIcon(R.drawable.alert_dialog_icon)
.setTitle(R.string.alert_dialog_single_choice)
.setSingleChoiceItems(<ListAdapter> or CharaSequnce[] , 0, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked on a radio button do some stuff */
}
})
.setPositiveButton(R.string.alert_dialog_ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked Yes so do some stuff */
}
})
.setNegativeButton(R.string.alert_dialog_cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* User clicked No so do some stuff */
}
})
.create();
Note :
Please see This link to Api for Bold text mentioned below
.setSingleChoiceItems(CharacterSequnce[] , 0, new DialogInterface.OnClickListener()....
Hope this helps . Thanks :)