Android :: Adding ArrayList Of LinearLayout Objects To UI
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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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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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 12, 2010
I have a member variable in my Activity which is an ArrayList. The objects populating this Array List are objects I have defined called Rating Item. Rating Item has several member vars like rating, comment, ID, etc. I would like to save this Array List in onSaveInstanceState so it can be repopulated from onRestoreInstanceState. What is the best way to do this? I've never saved the state of an object of this complexity.
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Aug 10, 2010
I am working on an application where I am saving the state of an application in an ArrayList. Now, to save this state, I tried to use Serialization. But, somewhere in the user defined object, I am using Button, which is not letting me serialize the entire object. I wanted to know, is there any other way of saving this array list between onPause and onResume? I even tried onSaveInstanceState, but it doesn't have support for Array List.
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Sep 16, 2010
I have an application that uses a service to create an ArrayList of custom objects (MyObject) every x seconds. I then want my Activity to obtain this ArrayList. I'm currently planning on having the Service send a message to the Activity's handler every time it finishes the query for the data. I want the message to the Handler to contain the ArrayList of MyObjects. When building the method in the Activity to get this ArrayList out of the message, I noticed that I couldn't.
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Nov 24, 2010
I need to display a list of categories from a ListActivity. My data source is a ArrayList of type Category which is implementing the android Parcelable interface. stucture is given at the bottom. it has an id and a title
I need title to be displayed as list text and on clicking the list item, i need to get the id for further processing
It is possible to create a new array of 'title's by iterating the category ArrayList and use
CODE:..........
But bu using this method i will get only the title of the category upon click and not the id.
Is it possible to directly use the ArrayList of objects as data source?
CODE:..................
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Sep 28, 2010
I need to populate a View with a data from adapter which contains some number of strings. The problem is that I don't know how many of the strings will be there. So my idea was to use LinearLayout to store data. But even if I reserve enough space for this data (eventually I will draw it in ScrollView), LinearLayout use only horizontal perspective (drawing Strings to the end of line), and not uses additional space beyond.
My intention is to draw to the end of line, and draw next line... till end of data.
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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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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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Sep 9, 2010
I want to add some checkboxes to a LinearLayout at runtime. The orientation is vertical and I want the checkboxes to appear at the bottom. I create each checkbox like this: CheckBox box = new CheckBox(this);
Then I add the box to the current view like this: addContentView( box , params ); What should be the params to get the effect I want? So far, everything I've tried ends up overlaying the new checkboxes on top of each other and on top of the other items in the layout. I want everything stacked in a column with the new checkboxes at the bottom.
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Mar 18, 2010
I'm trying to add views dynamically to a linearlayout. I see through getChildCount() that the views are added to the layout, but even calling invalidate() on the layout doesn't give me the childs showed up.
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Nov 17, 2010
I try to add a texview to linearlayout dinamiclly such as in the following code, but it doesn't appear when i run the application ?
setContentView(R.layout.advanced);
m_vwJokeLayout=(LinearLayout) this.findViewById(R.id.m_vwJokeLayout);
m_vwJokeEditText=(EditText) this.findViewById(R.id.m_vwJokeEditText);
m_vwJokeButton=(Button) this.findViewById(R.id.m_vwJokeButton);
TextView tv=new TextView(this);
tv.setText("test");
this.m_vwJokeLayout.addView(tv);
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Jun 18, 2009
I've been trying to add a linear layout to a listview header. The listview appears fine and is working as expected, but when i try to add a linearlayout to the header i get a java.lang.ClassCastException: android.view.ViewGroup$LayoutParams occuring at the list.addHeaderView (ll); line. I thought it might be something in the complex layout i had so i switched it to just a linearlayout with a colored background and still got the same error. The end result i an trying to get is a list with a header that is all scrollable.
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Jun 11, 2009
<LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Layoutbuttons"> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/Bsave" android:text="Save"></Button> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Clear" android:id="@ +id/Beditclear"></Button> </LinearLayout>
<LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/Ledititems" android:orientation="vertical" android:scrollbars="vertical" android:scrollbarStyle="insideInset" android:scrollbarAlwaysDrawVerticalTrack="true" android:fadingEdge="vertical" android:fadingEdgeLength="8px"></ LinearLayout>
</LinearLayout>
I am adding dynamicly created EditTexts to the last vertical LinearLayout:
ArrayList<EditText> arrayedititems; edititems = (LinearLayout) findViewById(R.id.Ledititems);
arrayedititems.add( new EditText(globalcontext) ); //multiple times to add many EditTexts .... edititems.addView(arrayedititems.get(lastindex) );
Now all the edittexts are being added fine and show up on the linearlayout, the problem is I get no vertical scrollbar and can not scroll the linearlayout (you can a see large number of failed attemptes in the xml entry to enable this scrolling, such as forcing scrollbars or setting to vertical) Do I need to call some sort of invalidate() or notifyDataSetChanged() like with an arrayadapter to update the LinearLayout into checking if it needs to enable scrolling?
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May 6, 2010
I have an Activity which uses a layout with a LinearLayout in it. Now I want to create in runtime a subactivity which loads some other layout and add this layout as item of my LinearLatout.
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Oct 26, 2010
The FAQ mentions a method of passing objects around activities. (It is not clear to me): "A HashMap of WeakReferences to Objects. You can also use a HashMap of WeakReferences to Objects with Long keys. When an activity wants to pass an object to another activity, it simply puts the object in the map and sends the key (which is a unique Long based on a counter or time stamp) to the recipient activity via intent extras. The recipient activity retrieves the object using this key.".................
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Jun 15, 2010
I have an application that have a Google map on Google Android 1.5 since we have been working on the application for a long time, we are not in stage of upgrading to the newest framework, so we are using 1.5. Now, I have map locations that are dynamically generated and drawn on the map at run-time to visualize some streams, Up to this point the application is working fine, Now my problem is that I am trying to filter the objects ( addresses) to visualize only the on-screen ones. I do NOT want to visualize the addresses that are off-screen. The way I am trying to do this is to check the screen-coordinates of each object (address) before visualizing it, then it the coordinates (x,y) more than (0,0) and less than (320, 460). I should visualize it. I am trying to use this approach, but it is not working for some reasons, I have tried many posts but could not understand why, there must be something missing somewhere that I am not aware of.
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Aug 21, 2010
If I have 2 LinearLayouts split %50/%50 everything is fine. Weights are 1 and 1. As soon as I add a TextView inside the top LinearLayout, it stretches that layout. I use "wrap_content" as the documentation says I should when it comes to weights. As you can see the red and green should be split evenly and text on grey background should be inside red box.
Here is the code:..............
Now if I switch to "fill parent" as follows it actually works but it creates another problem. Here is the code (so far so good):
So looking at above we were forced to use "fill_parent" and we would think like we fixed the problem but here is the problem if we are using "fill_parent" (I took out the textview just to show the problem, textview doesnt make the problem go away anyways):
As you can see I assign the weights 3 (top red) and 2 (bottom green) but what actually happens is they get flipped: The red becomes 2 and bottom becomes 3. Just measure the pixels too see.
Here are the results of the 3 codes: http://imgur.com/iVt8g.jpg
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May 25, 2010
I have a RelativeLayout that has two LinearLayouts in it. One is a bunch of TextViews and EditTexts that make up a form and the other is a ButtonBar that submits the form.
anyways, everything looks great in portrait, but when i switch to landscape mode the bottom TextView/EditText element is being hidden by the buttonbar.
screenshot to show the problem. as you can see some of the "email" textview and all of the email edit text are being hidden by button bar.
http://i45.tinypic.com/2dt7qmt.jpg
and xml:
CODE:............................
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Jun 25, 2009
Why is the following code causing an exception? The Code throws a "mBaselineAlignedChildIndex of LinearLayout set to an index that is out of bounds" exception.
CODE:..............
If l2 is dont added to l1 than it works.
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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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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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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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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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