Android :: Passing An ArrayList Of Objects
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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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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Jun 5, 2010
I'm not very clear about the Intent object and how to use it to pass data between Activities. In my application I have several tabs between which I want to pass ArrayList. Here is a sample code I plan to use, but I'm missing the part where the main activity catches the Intent and passes it to the new activity on start :
1. myTabs.java ==> This is where I think I need to add some code to pass the data between TabOne and TabTwo. For now it is just using the sample code of the TabActivity sample.
CODE:...........
2. TabOne.java ==> I added a piece of code in the onStop procedure to fill in the Intent data with the array I want to pass to TabTwo. Not sure it is the right way to do though.
CODE:...................
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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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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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Oct 29, 2010
Why is that the object has to be serialized or be Parcelable in order to be passed to an Intent ?
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Jul 5, 2010
If I attach an object to a bundle and store the bundle in an intent and start another activity, does that activity work on a copy of the original object or does it use the same object but just passes along a pointer?
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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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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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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 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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Apr 7, 2010
I wish to display data in the the arraylist in a list view. The arraylist is not a generic list but a object defined by me. I want to display only certain data of the object. Something like, an object of a student, I want to display the student's name only, the student id and the student dob is not required.
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Apr 3, 2009
I notice in the source code they are not used in critical loops, e.g. in View.java :
http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;...
I can see this kind of code which would be much easier implemented as an ArrayList :
1867 private void addInArray(View child, int index) { 1868 View[] children = mChildren;
1869 final int count = mChildrenCount;
1870 final int size = children.length;
1871 if (index == count) { 1872 if (size == count) { 1873 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT];
1874 System.arraycopy(children, 0, mChildren, 0, size);
1875 children = mChildren;
1876 } 1877 children[mChildrenCount++] = child;
1878 } else if (index < count) { 1879 if (size == count) { 1880 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT];
1881 System.arraycopy(children, 0, mChildren, 0, index);
1882 System.arraycopy(children, index, mChildren, index + 1, count - index);
1883 children = mChildren; 1884 } else { 1885 System.arraycopy(children, index, children, index + 1, count - index);
1886 } 1887 children[index] = child;
1888 mChildrenCount++;
1889 } else { 1890 throw new IndexOutOfBoundsException("index=" + index + " count=" + count);
1891 } 1892 };
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Apr 19, 2010
Today I met a problem, I need to pass a ArrayList<MyClass> from an activity to another. I dont know what the Intent exactly do when I use putExtra to pass in an ArrayList<MyClass> object. I guess MyClass need to implement Parcelable interface, so I just did it. But still, it does not work. Maybe I need to create a Bundle and then use Bundle's putParcelableArrayList method to put my ArrayList<MyClass> object in, and then pass this bundle as parameter of putExtra to the intent. So crazy! I am lazy, I just want to pass an ArrayList<MyClass> object simply, is there a simple way??
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Jun 21, 2010
I'm trying to parse a web service response using SAXParser and get certain values, store them into an arraylist, then display them in a listview. Example XML being returned from web service:
<ArrayOfStrings>
<string>value</string>
<string>value</string>
<string>value</string>
</ArrayOfStrings>
Here is my SAXHandler class:
public class SAXHandler extends DefaultHandler {
private boolean outertag = false;
private boolean mytag = false;
ArrayList<String> alist;
public ArrayList<String> getList(){
return this.alist;
} @Override
public void startDocument() throws SAXException {
} @Override
public void endDocument() throws SAXException{
} //@Override
public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
if (localName.equals("ArrayOfString")){ this.outertag=true;
}else if (localName.equals("string")){ this.mytag=true;
} }
@Override
public void characters(char ch[], int start, int length) {
if (this.mytag){ String s = new String(ch, start, length);
alist.add(s);
} }
@Override public void endElement(String namespaceURI, String localName, String qName) throws SAXException {
if (localName.equals("ArrayOfString")){ this.outertag=false;
}else if (localName.equals("string")){ this.mytag=false;
} } }
And here's my method calling and returing my web service:
try{ URL url = new URL("xxxxxxx");
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
XMLReader xr = sp.getXMLReader();
SAXHandler SAXHandler = new SAXHandler();
xr.setContentHandler(SAXHandler);
xr.parse(new InputSource(url.openStream()));
ArrayList<String> stateList = SAXHandler.getList();
aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, stateList);
RESTlist.setAdapter(aa);
I keep getting an exception and I don't know why. Can anyone give me a hand?
Logcat:
06-21 20:10:47.901: ERROR/AndroidRuntime(472): Uncaught handler: thread main exiting due to uncaught exception
06-21 20:10:47.950: ERROR/AndroidRuntime(472): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pa.passammain/com.pa.passammain.RESTtest}: java.lang.NullPointerException: println needs a message
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2401)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.os.Handler.dispatchMessage(Handler.java:99)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.os.Looper.loop(Looper.java:123)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.app.ActivityThread.main(ActivityThread.java:4203)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at java.lang.reflect.Method.invokeNative(Native Method)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at java.lang.reflect.Method.invoke(Method.java:521)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at dalvik.system.NativeStart.main(Native Method)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): Caused by: java.lang.NullPointerException: println needs a message
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.util.Log.println(Native Method)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.util.Log.e(Log.java:208)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at com.pa.passammain.RESTtest.onCreate(RESTtest.java:82)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
06-21 20:10:47.950: ERROR/AndroidRuntime(472): ... 11 more
After editing how my error is displayed in my try/catch i'm not longer getting an exception, but just a blank screen. Here is what my logcat is displaying:
06-21 20:22:00.330: WARN/System.err(542): java.lang.NullPointerException
06-21 20:22:00.352: WARN/System.err(542): at com.pa.passammain.SAXHandler.characters(SAXHandler.java:45)
06-21 20:22:00.352: WARN/System.err(542): at org.apache.harmony.xml.ExpatParser.text(ExpatParser.java:166)
06-21 20:22:00.362: WARN/System.err(542): at org.apache.harmony.xml.ExpatParser.append(Native Method)
06-21 20:22:00.371: WARN/System.err(542): at org.apache.harmony.xml.ExpatParser.parseFragment(ExpatParser.java:506)
06-21 20:22:00.371: WARN/System.err(542): at org.apache.harmony.xml.ExpatParser.parseDocument(ExpatParser.java:467)
06-21 20:22:00.371: WARN/System.err(542): at org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:329)
06-21 20:22:00.381: WARN/System.err(542): at org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:286)
06-21 20:22:00.381: WARN/System.err(542): at com.pa.passammain.RESTtest.onCreate(RESTtest.java:71)
06-21 20:22:00.391: WARN/System.err(542): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123)
06-21 20:22:00.391: WARN/System.err(542): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
06-21 20:22:00.401: WARN/System.err(542): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2417)
06-21 20:22:00.401: WARN/System.err(542): at android.app.ActivityThread.access$2100(ActivityThread.java:116)
06-21 20:22:00.410: WARN/System.err(542): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
06-21 20:22:00.410: WARN/System.err(542): at android.os.Handler.dispatchMessage(Handler.java:99)
06-21 20:22:00.420: WARN/System.err(542): at android.os.Looper.loop(Looper.java:123)
06-21 20:22:00.420: WARN/System.err(542): at android.app.ActivityThread.main(ActivityThread.java:4203)
06-21 20:22:00.420: WARN/System.err(542): at java.lang.reflect.Method.invokeNative(Native Method)
06-21 20:22:00.430: WARN/System.err(542): at java.lang.reflect.Method.invoke(Method.java:521)
06-21 20:22:00.430: WARN/System.err(542): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
06-21 20:22:00.442: WARN/System.err(542): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549)
06-21 20:22:00.442: WARN/System.err(542): at dalvik.system.NativeStart.main(Native Method)
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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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Dec 1, 2009
I created an application with loging and an arraylist to fill a ListView.
If i am calling or i need to check my mail, sometimes i lost the context of my application (variables and the listview !)
It is a little complex to save arraylist in SharedPreferences and i am not an expert in SQLite.
Do you know a solution to keep persistent my data (variables and the arraylist) during the use of my application?
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Jul 1, 2010
I am using the Android onTouchEvent to register touch and the associated movement. I then want to iterate a sprite along that path.
I need to store the path traced by the finger for use later on.
The problem is that after the finger is lifted off the screen the ArrayList (pArray) is completely populated with the X & Y position of the ACTION_UP coordinates.
From the Log i can see that it is adding the current X & Y position to the Arraylist while the finger is moving which is great but then the Arraylist gets overwritten by the data in Arraylist.size() - 1...
CODE:.....................
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Dec 10, 2009
I have a ArrayList
ArrayList<String> values=new ArrayList<String>();
values.add("s");
values.add("n");
values.add("a");
values.add("s");
In this i want to remove repeated value.
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