Android :: Adding To The Middle Of An Empty ArrayList
Aug 26, 2010
If I create a new arraylist of size 5...
And then I try to add to the middle of that arraylist...orderedPlayers.add(2, P);
I get an indexoutofbounds...I also get indexoutofbounds if I use set instead of add...orderedPlayers.set(2, P);
In fact the only way I can add P to the arraylist is if I use the 0 index...orderedPlayers.add(0, P);
And also for some strange reason when I do that my debugger in eclipse sees that element added to the 4th index of orderedPlayers instead of the 0th... is ArrayList buggy or am I completely missing something? how would I add to the middle of a null ArrayList?
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Apr 25, 2010
I am trying to save an arraylist to a .txt file below is the code I am using, which runs without error but when I try to go to Astro file manager and browse the data folder there is nothing there.
String filename = stationname.getText().toString() + System.currentTimeMillis();
FileOutputStream fos = openFileOutput(filename,Context.MODE_PRIVATE);
ObjectOutputStream out = new ObjectOutputStream(fos);
out.writeObject(report);
Report is the ArrayList that holds each of my station Reports.
out.close();
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Jan 27, 2010
I am trying to use the following code to go through an ArrayList of LinearLayout objects, add each one to a TableLayout, and finally add that TableLayout to a ScrollView defined in the main.xml file.
ScrollView theScrollView = (ScrollView) findViewById (R.id.scroll_view); TableLayout theList = new TableLayout(this); ArrayList<LinearLayout> theArray = Edit.getTheArray();
if (theArray.size() > 0) { for (int i = 0; i < theArray.size(); i++) { theList.addView(theArray.get(i)); } theScrollView.addView(theList); }
A second activity (Edit) is used to convert user input into a new LinearLayout and put it in the ArrayList. The code works successfully on the first item in the Array, however, after adding a second LinearLayout to the ArrayList and returning to the main activity, I get a force close and the following error: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
I can't seem to figure out what is happening here. Is there another method I should be using to get my desired results?
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Oct 28, 2010
Can I add a group of ArrayList into a single ArrayList? The ArrayList groups are of different sizes. Then How can I recognize each ArrayList?
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Jun 30, 2010
I'm assuming that your input XML is very simple and uses no element attributes, namespaces, or recursively nested elements. I recommend you use the following pattern, which I've used countless times:
Use a StringBuffer or StringBuilder to collect character data. Initialize it in startElement. In the characters method, do only the following: sb.append(ch, start, length). Please note that SAX parsers are not required to return the full contents of a text node in a single call to characters(). For efficiency, the parser may use an input buffer which may be smaller than a particular text node. A lot of people seem to miss this. Do the major processing in the endElement() method.
Do you use a debugger to step through your code?
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Oct 17, 2010
I have a ListView that with alphabetical headers for each letter. I also have an index function that brings the letter headers to the top of the screen.
My problem is when I reach the end of the list setSelection is unable to bring the last few headers to the top because it will not scroll past the end of the list.
My question is this: Is there a way to add a blank space to the end of the screen dependent on screen size? I would like to scroll until the last item in the list is at the top of the listView.
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Sep 22, 2010
For some reason the empty view (TextView in this case) always appears, even when the List is not empty. I thought the ListView would automatically detect when to show the empty view.How can I hook up the empty view properly?
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May 3, 2010
I want to add a contact just to my phone and not to my gmail account.Whenever I start to add a contact (phone, 208544.menu, +contact, create new contact,) the next thing it forces me to do is to choose an account to create the new contact under and it lists my 3 gmail accounts.I have no option to just put it on the phone.Any ideas here?We do the same thing on the Incredible but it gives us the gmail account and the phone to choose from but not on the Motorola.
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Jul 7, 2009
Is there a way to grow the progress bar from the middle and in both directions? Something like below:
CODE:.............................
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Aug 1, 2009
I have a vertical, set height (300px) LinearLayout (LL) with 3 nested LLs. 1 and 3rd are set with android:layout_height="wrap_content" and the middle one with android:layout_height="fill_parent". To my dismay, 3rd LL get's pushed out with 2nd one filling parent layout right to the bottom. How do I achieve desired effect since I want potentially resize the outside container with the middle portion expending and contracting to accommodate the change
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May 22, 2009
I have a slideshow function in my app and if the number of images is more, the phone locks (screen goes black) in the middle of the slideshow. How can I avoid this in my app?
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Sep 30, 2010
Does someone tell me what is application and middle layer in android. I have to know details these 2 layers and about linux kernal and how is related to android.
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Sep 22, 2010
I am trying to create a Java program that takes the firstname mi last name input and outputs "FI MI lastname".
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Aug 15, 2010
Hopefully this is a simple one as I've been asking loads recently...
I am trying to draw the a white circle with the following code...
but it is being displayed as a solid disk, how do I get it to just display as an circular outline with a transparent centre?
I've had a look in the help and it makes no sense to me, probably because I'm not used to the drawing terms like stroke and dither. What's wrong with background and border eh?
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Nov 17, 2010
I need that my user interface haves 3 sections
NORTH SECTION: four textviews with info about a user MIDDLE SECTION: a googlemap view with the position of the user SOUTH SECTION: a textview with time of last position, and a button to actualice the position (retrieving it from a database)
is this possible? i can't find any information about that on google or android developers guide...
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Sep 9, 2009
I'm new to android developing and I've done a function which return an arraylist type ArrayList<ArrayList>. I would like to display this arraylist for see if my function work.
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Jan 27, 2009
Is it possible to make TextView to break words in the middle and then move to another line, instead moving whole word that doesn't fit to the new line ? I have a width and number of lines of the TextView and a long string and want to calculate which portion of the String will fit exactly. the code is TextView vTextShort = (TextView) findViewById (R.id.story_text_partial); int lineHeight = vTextShort.getLineHeight(); int nmbLines = mesuredHeight / lineHeight; Paint mPaint = vTextShort.getPaint(); String shortTextStr = mStoryText; mStoryBreakIdx = 0; vTextShort.setLines(nmbLines ); int breakText = mPaint.breakText(mStoryText.toCharArray(), 0, mStoryText.length(), mesuredWidth, null); mStoryBreakIdx = breakText * nmbLines; It seems to calculate number of chars accurately but not accounting for the space that left after word is moved to a new line if it doesn't fit fully. And i'm looking on how to either break words in the middle or how calculate a width of the text that will fit correctly.
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Jul 30, 2010
I am having issue while showing a WebView in an activity in the middle of the screen. I have an activity and I want to show a webview in the center of screen. My activity is transparent so background activity will be visible. Whenever I try to create a webview and add it to activity using setContentView(webview) it always shows the view on the top left corner of the screen. Is their a way to workaround this?I am trying to do this via pure code only.
Here is my code.
CODE:....................
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Nov 5, 2010
I recently bought an android phone.Samsung galaxy's.I just found out the android market is not available for the middle east ( which i am from ).Is there anyway around this?Rooting? Downloading it from some website over SD card?Or at least can i download android apps from pc and transfer to phone over SD card?
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Oct 9, 2010
I'm writing my own custom view, a keyboard, which I think the ArrayList in the keyboard view is causing the application to quit in the emulator.
public static ArrayList<HexButton> hexButtons = new ArrayList<HexButton>();
The application ran fine when I did
setContentView(myKeyboardView);
But I want to nest my keyboard with a TextView so I'd like to be able to do
setContentView(R.layout.main);
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Nov 12, 2010
Is there a way to pass an Array List of objects between activities? The myObject implements Parcelable and I'm able to successfully pass the objects around individually, but that means I need to have an exact amount of "myObjects" coded. I want this to dynamically grow/shrink by what the user does with the app. I have seen some posts on the web about doing:
Activity A
ArrayList<myObject> myObjArray = new ArrayList<myObject>();
Then when passing this into the intent I would use:
intent.putParcelableArrayListExtra("myObjArray", myObjArray);
Activity B
ArrayList<myObject> myObjArray = new ArrayList<myObject>();
Bundle extras = getIntent().getExtras(); myObjArray = extras.getParcelableArray("myObjArray");
However, the myObjArray always gets filled with "null". How can I achieve this?
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Apr 7, 2009
I have an ArrayList<MyList> aList in an activity. I would like to send this data to another activty. Such that,
ArrayList<MyList> aList;
Intent intent = new Intent(); intent.setClass(mainactivity.this, newActivity.class); intent.putExtra("MyList", aList ); startActivity(intent);
On the receiving activity,
Intent i = getIntent(); newList = (ArrayList<MyList>) i.getSerializableExtra("MyList");
But this gets me no where. ERROR! My intention is to share this List between activities.
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Nov 16, 2009
Can any one tell me how to store and retrieve arraylist in/from sqlite.
ArrayList<Double> results = new ArrayList<Double>();
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May 30, 2010
I was trying to serialize an ArrayList which contains custom objects. I'm serializing it in a Servlet (server side), and deserialize at the client side. (using ObjectOutputStream and ObjectInputStream)
It worked fine, when I work with ArrayList<String>.
But when I tried it with ArrayList<MyObject> I couldn't get any results in the client side, this is the exception:
java.lang.ClassNotFoundException: web.MyObject
Of course I have done this:
public class MyObject implements Serializable { ... }
MyObject contains only String fields.
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Jun 8, 2010
I want the contains() method from ArrayList to be case insensitive. Is there any way?
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Jun 15, 2010
I have two applications which i want them to share the same arraylist.
How could i achive something like that? is there anything in Android for sharing such a prefrenceses?
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Aug 19, 2010
I am trying to add an object to an arraylist but when I view the results of the array list, it keeps adding the same object over and over to the arraylist. I was wondering what the correct way to implement this would be.
CODE:..............
I have double checked my JSONArray data and made sure they are not duplicates. It seems to keep adding the first object over and over.
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Aug 26, 2010
I want to save an ArrayList so that it is persistent. The contents can change. What is the best way of approaching this in android?
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Oct 27, 2010
I want to pass an Arraylist from one activity to another. I use putStringArrayListExtra(), but there shows an error : "The method putStringArrayListExtra(String,ArrayList is undefined for the type bundle." Is there any other method available for passing ArrayList?
CODE:..................
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Sep 1, 2010
Something is wrong whit my code. in application when I "add item", it doesn't show anything, and if aim clicking somewhere around the android application, then "item" sometimes comes. code...
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