Android :: Java Settings Object - Serialization/deserialization

Dec 2, 2009

(Code is for Android Actually, I need code to be portable between Android and Java SE.)

I want to have a "settings" class with various game settings, like

public int map_size;
public String server_name;

etc.

The data needs to be accessed fairly frequently (so members, not a key-value map), and from time to time de/serialized in some standard way (mainly to send it through network).

I want to be able to

Serialize and deserialize the object into XML or JSON, without having to explicitly write the code for every member (but still having some degree of control over the format).
Define some (constant) meta-data about every member (default value, GUI name, XML identifier, ...), in a way that allows for easy modification in the source code (I want to be able to add a new meta-property, define a default value for it, and not have to specify it everywhere else).

1 is achievable by using reflection. I thought Java annotations for class members would be perfect for 2:

CODE:.............

But it looks like (user-defined) annotations don't work in Android yet - code using them crashes the compiler...

What would be the easiest way to store the meta-data about the settings (or another way to approach all this)?

Store information about settings in some external XML file? Store it in a Java data structure, with content defined in the code? Defining the data in this way somehow seems very unwieldy, especially compared to keyword arguments of annotations?

Android :: Java settings object - serialization/deserialization


Android : Convert Android.net.Uri Object To Java.net.URI 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.

CODE:...................

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Jan 9, 2010

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While trying to execute the following lines:

CODE:................

The line if(drawable.equals(null)) throws an exception if drawable is null.

Does anyone know how should the value of drawable be checked in order not to throw an exception in case it is null and retrieve the local image (execute drawable = getRandomDrawable())?

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Android :: Passing Around Object References In Java?

Jun 25, 2010

I'm writing some stuff in java and i ran into some problems lately. cut short, i need to compare an object i created to another instance of this very class i instantiazed before with different data.

looks like this:

CODE:........

with a class a:

CODE:..........

The problem is, that i end up finding out that the values from newA are always equal to those from oldA. so i guess sth went wrong with passing the references of the objects in the last line of the loop...i thought java always passes references of objects unless an explicit copy() is called? if this does matter: this code is running on android - don't know if the dalvik vm messes aroung with this...

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Android : How To Scale A Bitmap Object In Java

Apr 14, 2009

I have constructed a Bitmap object in Java. Can you please tell me how can I scale it (x, y with a different ratio) on android?

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Android :: Send A Json Object From Java To .net Client?

Oct 29, 2010

From my android client i am sending a json to string object.but the .net client is getting it as empty string. here is my code...

is this header format correct?

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Android :: Way To Store XML Data In A Java Object From A SAX Parser

Jun 21, 2010

I have created a class with 3 sub classes in Java. The 3 sub classes contain variables to store information from my XML document. I am able to store in the first two for there are only single instances of the data in the XML. The third class contains variables that repeat multiple times. I want to store an object of "third class" objects. I also have a SAX parser class. I am doing this within an Android environment (1.6).

Does this make enough sense without displaying any code?

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Android :: IPhone Java String Code To Object C

Jul 28, 2010

I have 2 String Operations I would need relevant in Object C // Get the newstring from mystring start at counter Java: newstring = mystring.substring(counter) OBJ-C: ? // Get the position from searchstring in mystring Java: startpos = mystring.indexOf(searchstring) ObJ-C: ?

I had two other questions and found now the solution (here als for others)

CODE:.................................

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May 23, 2010

I was wondering what the simplest program for sending an object from my Android phone to my computer wirelessly (via LAN) would be. I have created Java RMI programs with a server and multiple clients, so I have a grasp of the concept. However with android I'm just not sure where to start.

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Android :: Passing Object To Method In Java Appears To Be By Reference

Sep 29, 2010

I thought when you passed objects to methods in Java, they were supposed to be by value.

public class MyClass{
int mRows;
int mCols;
Tile mTiles[][]; //Custom class

//Constructor
public MyClass(Tile[][] tiles, int rows, int cols) {..........

At this point, any changes to the mTiles object are reflected back to the tiles object.

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Android :: Pass In Object Java Class Embedded In As Parameter

Apr 19, 2010

I'm building an android application, which has a list view, and in the list view, a click listener, containing an onItemClick method. So I have something like this:

public class myList extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
getListView().setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
/* Do something*/
}
}
}

Normally, this works fine. However, many times I find myself needing too preform an application using the outer class as a context. thusfar, I've used: parent.getContext(); to do this, but I would like to know, is that a bad idea? I can't really call: because it's not really a subclass, just an embedded one. So is there any better way, or is that considered cosure? Also, if it is the right way, what should I do if the embedded method doesn't have a parameter to get the outside class?

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Android :: Reading Java Serialized Object That Has Been Split Across Two Files?

Mar 2, 2010

I'm writing an Android application. One problem is your app cannot contain a file whose uncompressed size is bigger than about 1Mb. I have a serialized object that I want to load that totals about 2Mb. My plan was to split this file into two smaller files, then load the object by combining both files at runtime.

However, I cannot work out how to use e.g. InputStream and ObjectInputStream to specify that I want to read the data from two input streams. How can I do this?

For example, say my object was split between file O1 and O2. How can I say "Load the object by reading the data from O1 then from O2"?

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Android :: Class That Turns That An XML String Into Java Object - ClassNotFoundException

Jun 22, 2010

So I ran into a problem today while working on my Android program. I have a class that turns that an XML string into a Java object (third party) and it works fine in as a regular java project but on Android I get this weird error:

CODE:.......

I hide my application name and my package for obvious reasons but I was wondering if anyone has ever encountered problems like this. Class is in the correct package, which is a library I have added. Other classes that I reference before are there and those can be made. Are there any other reasons a ClassNotFound Exception is thrown?

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Aug 25, 2010

In my Android client I want to receive JSON objects from a server. By googling I found a lot of different possibilities how to best parse the InputStream from the Server, but most of them wrote their own parser. Isn't there a library which does this parsing for me? Or how should I best implement it by myself?

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Nov 24, 2010

I have the following json response from a url:

CODE:........

And here's how I'm doing the parse:

CODE:.......................

When I run the code, I get this error: ERROR/AndroidRuntime(823): java.lang.RuntimeException: No-args constructor for class com.project.driver.Driver$Post does not exist. Register an InstanceCreator with Gson for this type to fix this problem.

I'm having trouble with defining a suitable Driver.java for the parse. When I omit the 'last5comments' field, everything works fine, it's just the 'last5comments' bit I'm having trouble with...

Here is Driver.java:

CODE:......................

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Android :: Way To Test Serialization?

Oct 28, 2010

I am trying to implement serialization for an email application on the android (stroring username, password, server etc.), but in order to test it I have to close the application in the emulator and then re-open it to ensure that it looks and finds the file with the serialized objects. The problem is that when I close the application on the emulator uninstalls the application. I close the application with the finish() function. Any inklings as to why this happens? And it wasn't doing it until further along in my development stage.

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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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Apr 8, 2009

I have a settings.java file that has the following code...

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Android :: Activity Life Cycle - Serialization Taking Too Long

Jul 27, 2009

Finally after many days of getting StackOverflowError, I've tracked down the issue and fixed it, only to find that my game's serialization takes about 5 -10 seconds on the emulator and most likely around that in the target. So far my the lifecycle of my game is as follows

onCreate - check if serialization file exists, if it does, de- serializes it. (~ 5-10 seconds) onPause - if the game is not complete, then serialize it (~ 5-10 seconds) I remember reading somewhere that another activity's onResume will NOT get called UNTIL the previous activity's onPause has ended. So I am worried that my game is delaying another activity that wants to start from doing so i.e like a phone call etc. I think speeding up the serialization is not going to be feasible, so any ideas on what I can do? Can I serialize in the onDestroy instead of the onPause? I read that the onPause is the only safest place to store the state.

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Sep 9, 2009

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Jun 8, 2009

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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 :: Call Java File On Click In Another Java Class?

May 19, 2010

i have two files

App.java
Gallery.java

App. java contains frontend buttons and functionalities Gallery.java lists the imagesin the sd card. i want to call Gallery.java in click event in app.java

App.java
package gallery.display;
import android.app.Activity;
import android.os.Bundle;
import android.view.View.OnClickListener;
import android.view.View;...........

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Mar 16, 2009

I'm trying to call a java method from javascript using addJavascriptInterface(); but seems does not work, it always display "failure"; java code...

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Android :: Java.io / Java.Lang Different From Packages In Windows?

Aug 8, 2009

Java packages like Java.io, Java.Lang etc used in android, are they different from Java packages in windows ? means specially made for android ?

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Android :: Java Compatibility With GetFields Method In Android Java.lang.Class

Feb 11, 2009

I'm having some problems porting a Java application to work in Android platform. I detected an incompatibility problem between java sun and Adroid sdk in java.lang.Class. I oberved that: public Field[] getFields() Returns an array containing Field objects describing all fields which are defined. That's array is sorted as attributes are declared in the main Class in sun jdk. For example, next Class is defined as: public class Example { public boolean stop; public int atr1; public String name; ....
}

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Android :: Android / Java - Call Function In Separate *.java File?

Aug 16, 2010

I do an import of the full package name / java file, and if I do a <classname>.<method>, SOMETIMES I can get it to access - other times I get a lot of can't use a static in a non static bunch of talk. I'll admit I'm new to Java, so what do I need to do? Call a class instance first, then call my methods? I'm rather confused by this, as I want to put all of my 'functions' into a FunctionsList.java file, and all of my main Activity (UI) into a MyActivity.java file.

For example:
<MyActivity.java>
import com.example.FunctionsList;
private class MyActivity extends Activity {
FunctionsList.function();
}


9/10 times I get that static/non-static error. If I put all of my functions into MyActivity.java, I have zero problems!

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Android :: Integrate My Settings Activity Into Settings Apk

Apr 6, 2010

I know ime developer can create his own setting activity which will be displayed in Settings apk. I wonder whether there is a common way to interate any settings activity into Settings apk.

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Android :: Android IME - Add Settings List Item In Language And Keyboard Settings Screen

Sep 14, 2010

... like "Swype settings" in this picture. Been searching for hours on how to do this. Going to go insane.

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Android :: Call Java Methods From One Java Class To Another In Android?

Nov 3, 2010

i hav two classes...both classes are extends activity.. i need call other class method on main class on android development..its urgent..please.. i done something like subclass sub = new subclass()...its not work..

package org.me.intent_testing;
import android.app.Activity;
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