Android :: Save Variable And ArrayList Of Object

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?

Android :: Save variable and ArrayList of object

Android :: Displaying Certain Data Of Object In ArrayList?

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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Android :: Binding A Ksoap Object To An ArrayList?

Apr 13, 2010

I'm working on an app that calls a web service, then the webservice returns an array list. My problem is I am having trouble getting the data into the ArrayList and then displaying in a ListView. Any ideas what I am doing wrong? I know for a fact the web service returns an ArrayList. Everything seems to be working fine, just no data in the ListView or the ArrayList.....donned on me that the data the webservice responds with is a complex type. I really think that's where I am getting hung up, but not sure how to correct it.

I finally figured out my webservice returns a JSON Array. Now getting that over to the ArrayList and/or ListView is the challenge. I have a feeling that once this project is done, it might make for a great tutorial or example...


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Android : Way To Parse JSON Object Into ArrayList / Map?

Jul 14, 2010

Is there any way to parse JSON object, that comes from facebook server in a response, into ArrayList or Map so that i can set values in my ListView. I am finding difficulty in parsing because JSON object itself contains JSONArray and this Array can contain JSONObject may be in recurcive order.

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Android :: Save The Contents Of An ArrayList?

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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Android :: Possible To Save Text From Webpage To String Variable?

Oct 29, 2010

I want to save something from a webpage (loaded into webview) into a Java variable. Is that possible?

Example: I have a webpage with written text: HELLO STACK!. How could I save that text into Java var (String foo ?

Could I do it with JavaScript/Java cooperation?

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Android :: How To Save An Object To File?

Sep 2, 2010

Does someone know how to save and restore an object to a file on android ?

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Android :: Save Reference To An Object?

Apr 2, 2010

I have a Timer in my application, and would like to allow the user to set the timer, and maybe cancel it in another execution of the application. To do that, I need to have a reference to the Timer created in the first execution. How can I obtain that? Is there a way of storing/retrieving memory addressed?

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Android :: How To Serialize An Object / Save It To File In Droid?

Nov 7, 2010

Say I have some simple class and once it's instantiated as an object I want to be able to serialize its contents a file, and retrieve it by loading that file at some later time.. I'm not sure where to start here, what do I need to do to serialize this object to a file?

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Android : Takes Drawable Object - Scale Image - Save Memory?

Aug 23, 2010

I need to know how he takes drawable object. I'm collecting some ImageView objects in array, they have background images that are rather big in resolution so they take lot of memory...

I have read somewhere that it will automatically create image with resolution that my imageView have, so i think it will take less memory than first one. Please tell me, if i set scaleType property, will it scale that image? Will that help me to save memory?

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Android :: Changing Variable Affects Indirect Variable (value Vs Reference)

Sep 26, 2010

Is copying the reference to the object and not the value of the object. Meaning, when I modify or pos.bottom, the original object gets modified. I'm guessing I am missing a concept of pass object by reference vs value here which I thought I understood. What is the fix here? Is it a problem with how I defined my custom class?

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Android :: How To Use URL Variable To Load Webview ? Not Using String Variable

Nov 3, 2010

these is how to give a string as argument String link =" /devnet/acrobat/pdfs /pdf_open_ parameters.pdf"; webview.loadUrl(link);But how to give an "URL" variable to load its content to webview.

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Android :: How Can I Get Current Activity Object In Instrumentation Object?

Sep 9, 2009

I want to do some automated testcase with Instrumentation . Suggest that my AUT has 2 Activity. After clicking the button in ther first Activity, the second one will be shown with new content base on what we enter in the first Activity.) Instrumentation provides us the function called startActivitySync() and return the Activity object for processing. My question is how we can get the pointer of the second Activity after the it is shown by clicking the button on the first activity.?

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Android :: Cast Picture Object To Bitmap Object

Jun 8, 2009

I would like to convert a Picture object to Bitmap object in memory, without writing data to disk.

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Android : Get Activity Object From Intent Object

Sep 21, 2009

I have an Activity that running on system. I can get the Intent that is used to start the activity. But i don't know how to get the Activity object from the Intent object or something else. Can anyone tell me how to do this??? Note that, I don't use Instrumentation object.

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Android : Convert Object To Object

Feb 18, 2009

I am trying to get a FileInputStream object on an image that the user selects from the picture gallery.

This is the android URI returned by android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI content://media/external/images/media/3

When I try to construct a java URI object from this object, I get an IllegalArgumentException with the exception description Expected file scheme in URI: content://media/external/images/media/3 whereas the android URI shows the scheme as content

Never found a solution for the original question. But if you want the byte stream of an image in the pictures gallery, this piece of code will do that.


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Android :: How To Display An ArrayList?

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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Android :: ArrayList In Custom View?

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

But I want to nest my keyboard with a TextView so I'd like to be able to do

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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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Android :: Passing ArrayList Across Activities

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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Android :: Arraylist Storage In SQLite

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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Android :: Custom ArrayList Serialization

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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Android :: ArrayList & Contains() - Case Insensitive

Jun 8, 2010

I want the contains() method from ArrayList to be case insensitive. Is there any way?

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Android :: Share An Arraylist Between Applications

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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Android :: Correct Way To Add Objects To An ArrayList

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.


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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Android :: How To Pass ArrayList Using PutStringArrayListExtra()

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?


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Android :: Can't Add Item To Arraylist With Bottonclick / How To Do

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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Android :: Code Which Would Be Much Easier Implemented As ArrayList

Apr 3, 2009

I notice in the source code they are not used in critical loops, e.g. in :;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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Android :: Pass ArrayList Parameters Between Two Activities

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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Android :: Using SAXParser To Get List Of Strings To Arraylist

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:

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;
} }
public void characters(char ch[], int start, int length) {
if (this.mytag){ String s = new String(ch, start, length);
} }
@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.parse(new InputSource(url.openStream()));
ArrayList<String> stateList = SAXHandler.getList();
aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, stateList);
I keep getting an exception and I don't know why. Can anyone give me a hand?

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{}: java.lang.NullPointerException: println needs a message
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at$2100(
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at$H.handleMessage(
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.os.Handler.dispatchMessage(
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at android.os.Looper.loop(
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at
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(
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at$
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at
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(
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at
06-21 20:10:47.950: ERROR/AndroidRuntime(472): at
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
06-21 20:22:00.352: WARN/System.err(542): at org.apache.harmony.xml.ExpatParser.text(
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(
06-21 20:22:00.371: WARN/System.err(542): at org.apache.harmony.xml.ExpatParser.parseDocument(
06-21 20:22:00.371: WARN/System.err(542): at org.apache.harmony.xml.ExpatReader.parse(
06-21 20:22:00.381: WARN/System.err(542): at org.apache.harmony.xml.ExpatReader.parse(
06-21 20:22:00.381: WARN/System.err(542): at
06-21 20:22:00.391: WARN/System.err(542): at
06-21 20:22:00.391: WARN/System.err(542): at
06-21 20:22:00.401: WARN/System.err(542): at
06-21 20:22:00.401: WARN/System.err(542): at$2100(
06-21 20:22:00.410: WARN/System.err(542): at$H.handleMessage(
06-21 20:22:00.410: WARN/System.err(542): at android.os.Handler.dispatchMessage(
06-21 20:22:00.420: WARN/System.err(542): at android.os.Looper.loop(
06-21 20:22:00.420: WARN/System.err(542): at
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(
06-21 20:22:00.430: WARN/System.err(542): at$
06-21 20:22:00.442: WARN/System.err(542): at
06-21 20:22:00.442: WARN/System.err(542): at dalvik.system.NativeStart.main(Native Method)

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