Android :: Parsing XML And Initializing Static Variables Of Some Class
Dec 21, 2009
I have an application that is driven by a configuration XML: various app properties are loaded at the app start-time by parsing the XML and initializing static variables of some class. The data read from this XML drives different Activities of the application. Presently, I have called the "parsing and the properties-initialization" from the onCreate() of my Main Activity. I have a few questions as regards this case/approach: Should I invoke the app initialization method from the Application Object or is the current approach correct?
What advantages/disadvantages do/would we get/have if I choose to invoke it from the Application object? Do we really need a static class to store app properties? Or can we have all the properties as a static Collection variable in the application object? Parsing a XML(~200 nodes) at app load time might take some time (not sure how long tho); How can I avoid the dreaded ANRs? I am using a Pull Parser.
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Mar 19, 2010
In android, are using static variables a recommended practice?
E.g, implementing a Singleton pattern in Java, I usually do...
Also, when does this get cleaned up by the Android JVM?
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Mar 30, 2010
i want to display a msg to the user (msg box or Toast) when exception happend in a static SQLite Database class that i use. the problem is that i cant call a non static method in a static class , how can i handle this. this is the class
private static SQLiteDatabase getDatabase(Context aContext) {
and i want to add something like this in the class when exception happen but context generates the problem of reference to non static in static class.
Context context = getApplicationContext();
CharSequence text = "Hello toast!";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(context, text, duration);
toast.show();
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Jul 14, 2009
I just ran into a situation where it looks like a static variable reference is persisted across activity sessions. I didn't expect that because I thought that when an activity exits, it's de-referenced and garbage collected. I am wondering if anyone can shed some (more) light on when the VM eliminates object references for Activities and Services and in particular when static variables get reset to default values?
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Jun 17, 2010
I am using static Arrays and HashMaps to store some values in my AppWidgetProvider class. But they are becoming null when the process dies, so the widget does not work anymore. Are there any alternatives to using static members to store data for an AppWidgetProvider in Android?
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Dec 1, 2009
I have been facing problems to manage statics variables used in my android application. If we exit the application against a particular event (touch or key event -which is must for my app), all the statics variables are retaining the values when I am launching it again. I am invoking Activity.finish() method for termination . I know there is a collection type class available called Bundle and we can use it to save the states of all the statics and get those back when again creating the same activity during relaunch, but it would be a hard task if we want to port some j2me applications to Android because of having thousands of statics variables. Is there any way to kill the application completely including all the statics variable used there?
I tried with System.exit(0) and it works well for Android G1 and G2 (tested in firmware 1.6). But in Android Robyn (prototype) the same causes a major defect ("Activity not responding" popup apears just after exit) and I came to know from android dev forum that calling System.exit(0) is not recommended for termination of an activity.
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Sep 15, 2010
Why should a static method in java accept only final or non final variables within its method, but not static?
For example I have the following method:
CODE:.................
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Sep 7, 2010
Do static variables of an ApplicationContext subclass left untouched when the process is killed?
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Aug 12, 2010
I split my inner View class from my Main class into its own file. In my main class, I have the view set as an onTouchListener which records user movement into a matrix so it can translate and scale the view. After separating it everything works but im unsure how to pass the matrix to the View for onDraw to update. Any suggestions?
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Dec 31, 2009
Is there any reason not to use the Application class to share variables across Activities? For instance a handle to the DB or a single HttpClient.
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Oct 12, 2010
I have Parsed the Json Response and Now I want to use the BaseAdapter Class in my Application. I have a rough Idea about the BaseAdapter Class but not very clear about the same. what exactly the Base Class does.
Also do I need to use the Getter and Setter Methods if I am using the BaseAdapter Class in my Application?
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Jan 5, 2010
I am new to Android, and I haven't developed any app regarding databases on Android yet. So I have a few basic questions. I am after a good database class sample, that will let me to run the CRUD operations. I would like to use it as a static class
like: clsDB->Select("select * from clients");
or objClient->Delete(clientid);
I am wondering if someone, can share his database classes, if more people share the best. Also I have in mind to reuse this class in multiple ways, I will have services, activities etc...
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Oct 2, 2009
if the inner UpdateService class is not static, it cannot start the service. The ActivityManager complains "Unable to start service Intent"...
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Oct 18, 2010
I've been trying to call a non-static method, located in my main application Class, from the Preferences Class. Because the method I call is not static, I instantiate the main class and then try to call the specific method I want but it's force closing.
Preferences.class (from where I call the method):
Preference sorted = (Preference) findPreference("sortPref");
sorted.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
public boolean onPreferenceChange(Preference preference, Object newValue) {
Object d = new Dmarks();
((Dmarks) d).queryBookmarks();
return true;
}});
the Dmarks.class method I call:
public void queryBookmarks() {
Toast.makeText(context, Toast.LENGTH_LONG).show();
//context is not null and the Toast is working if I call it from Dmarks.class }
The Logcat:
E/AndroidRuntime(11718): FATAL EXCEPTION: main
E/AndroidRuntime(11718): java.lang.NullPointerException
E/AndroidRuntime(11718):
at android.content.ContextWrapper.getContentReso
lver(ContextWrapper.java:90)
E/AndroidRuntime(11718):
at android.app.Activity.managedQuery(Activity.ja
va:1520)
E/AndroidRuntime(11718):
at com.droidil.droidmarks.Dmarks.queryBookmarks(
Dmarks.java:101)
E/AndroidRuntime(11718):
at com.droidil.droidmarks.Preferences$2.onPrefer
enceChange(Preferences.java:47)
E/AndroidRuntime(11718):
at android.preference.Preference.callChangeListe
ner(Preference.java:756)
E/AndroidRuntime(11718):
at android.preference.ListPreference.onDialogClo
sed(ListPreference.java:219)
E/AndroidRuntime(11718):
at android.preference.DialogPreference.onDismiss
(DialogPreference.java:384)
E/AndroidRuntime(11718):
at android.app.Dialog$ListenersHandler.handleMes
sage(Dialog.java:1047)
E/AndroidRuntime(11718):
at android.os.Handler.dispatchMessage(Handler.ja
va:99)
E/AndroidRuntime(11718):
at android.os.Looper.loop(Looper.java:123)
E/AndroidRuntime(11718):
at android.app.ActivityThread.main(ActivityThrea
d.java:4627)
E/AndroidRuntime(11718):
at java.lang.reflect.Method.invokeNative(Native
Method)
E/AndroidRuntime(11718):
at java.lang.reflect.Method.invoke(Method.java:5
21)
E/AndroidRuntime(11718):
at com.android.internal.os.ZygoteInit$MethodAndA
rgsCaller.run(ZygoteInit.java:868)
E/AndroidRuntime(11718):
at com.android.internal.os.ZygoteInit.main(Zygot
eInit.java:626)
E/AndroidRuntime(11718):
at dalvik.system.NativeStart.main(Native Method)
D/dalvikvm(11718): GC_FOR_MALLOC freed 4248 objects / 282248 bytes in 40ms
W/ActivityManager( 244): Force finishing activity com.droidil.droidmarks/.Preferences
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Apr 15, 2010
I want to refer to a static Java variable in my styles.xml, is that possible? Here's a pseudo-xml example:
<style name="Artwork">
<item name="android:background">@drawable/border_{Constants.MY_COLOR}</item>
</style>
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Dec 9, 2013
I have a thread on StackOverflow (titled: NoClassDefFoundError for Jersey 2.4.1 client in Android) but I thought I would reach out here in hope of getting a more specific/targeted audience group.I have followed instructions from other posts about the libs Android dependency fix but I still get the issue.
I am using Eclipse Juno, with an Android App targeting API 17. Basically I am getting a NoClassDefFoundError at runtime for the org. glassfish. jersey. model.internal.CommonConfig$1 class located in jersey-client-2.4.1.jar. This is when I just do a Run As... deploy from within Eclipse and it fails when I instantiate the CommonConfig class or one that depends on it internally. The start up log is given below:
[HIGH]12-10 12:25:20.657: I/dalvikvm(10170): Failed resolving Lorg/glassfish/jersey/model/internal/CommonConfig$1; interface 920 'Lcom/google/common/base/Function;'
12-10 12:25:20.657: W/dalvikvm(10170): Link of class 'Lorg/glassfish/jersey/model/internal/CommonConfig$1;' failed
12-10 12:25:20.657: E/dalvikvm(10170): Could not find class 'org.glassfish.jersey.model.internal.CommonConfig$ 1', referenced from method
[code]....
It doesn't seem to find a static inner class of CommonConfig. In the SO forum I tinkered with some options in ProGuard but I've come to learn that this isn't even used in the standard debug mode, only when you do a release build (Export from Eclipse). It would appear that something is happening with the class but I can't figure out why it would not be included if its parent is. Is there some kind of 'light' ProGuard process that goes on when a debug deploy is done? how to resolve this particular case of NoClassDefFoundError?
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Mar 20, 2012
I am developing an application which incorporates socket programming. I need to refer to the socket object created in the starting application when connected to a server in any other activity in that application .
Can I define a class in an acitivity and define a socket as a static field in that class and refer to that socket object from any other activity in that application?
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Feb 7, 2010
I'm having some issues with the old "Cannot make a static reference to a non-static method" error in my Android program. I am creating a sand falling game (similar to the Powder Game) and I created a class called Control to create a Control Bar at the bottom of the screen with a slider for brush size (that works fine) and a button to pop up a Dialog to allow users to pick the selected element. However, when I call DemoActivity.showDialog(2) from my code, it gives the static reference to non-static error (DemoActivity is the main activity of my application). I also tried changing it to just Activity.showDialog(2), but I got exactly the same error!
Here's my code:
CODE:................
I fixed it by adding the following to my Control.java code:
CODE:..........
And then calling control.setActivity(this); from my onResume section of DemoActivity.java!
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May 26, 2010
I am modifying the source code here: http://thinkandroid.wordpress.com/2009/12/30/getting-response-body-of-httpresponse/
I get this error:
code:.............
This error is line 13 on the second box.
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Feb 25, 2009
Is there any way I can load a URL without actually having the user see the web page? I'm trying to make a game with a hi score table, and loading the hi score URL in the browser would reveal the mechanism and allow the hi scores to be easily hacked. I have a php file on my server that my application is supposed to load to submit the hi score.
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Mar 18, 2013
I have Eclipse Juno and I'm working on an app with that.
The main activity will have a scrollable menu that takes you to all the other activities.
So the general structure/outline right now:[HIGH]Relative Layout ImageView (header logo type thing) ListView (the actual scrollable menu)[/HIGH]Here's the problem though... I can't find any simple list tutorials. I can easily make a single line list work but I need to make a two line list and one that is static, not dynamic and no examples are out there for that. It's like if you want to make a 2 line list, you can only learn how to do it in the most code-heavy ridiculous way possible.
Essentially what I am looking for with the list is this: Item one: Centred, bold, non selectable title (Resources)
- Item two-??: two line list items, click-able to a new activity, title of the section on first line, description on the second line.
- Item ??: Centred, bold, non selectable title (Tools)
- Item ??-??: two line list items, click-able to a new activity, title of the section on first line, description on the second line.
Nothing dynamic that is ever going to change, no super complex wonkey calculations, just to simply have the data set in stone (preferably via XML) and to call it into the list.
I experimented with some of the other list views and no matter what I did, I could get, via editing the resources and NOT using Java, more that one item on a single line but it wouldn't format it properly according to the layout I guess because I haven't got the ID correct or whatever I don't know.
I mean, all the examples I've seen for a 2 line list are extraordinarily over-coded and just bloated. I mean I have a website I am still working on in C#/ASP.net that has far more complex things in it with half the code that I've seen for the examples of the two line lists.
I tried on my own to figure it out (I am decent with C# and vaguely familiar with Java, self taught, and programming for some other systems like Python, again all self-taught), but like ALL coding references, they're organised by the actual code you implement (that you don't know) instead of by what you want it to do (so you have to search the whole code base to find something that you don't know what it's called but know what it does). >:C
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Feb 17, 2010
I've gotten headaches from this too.
Usually a double loop works fine for me:
CODE:....................
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Mar 9, 2009
I have been finding it convenient to extend Handler in many of my activities to handle messages specific to the activity. The handler sublass is an inner class of the activity and needs to access its state. I am wondering if there is any performance difference between making the handler subclass static and passing in the activity explicitly in its constructor or making the subclass an "instance class" and letting the vm worry about my accessing members of the containing activity.
The static approach:
CODE:.............................
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Dec 30, 2011
I am implementing a ListView by changing the selected item's background in OnItemClick. However, I am not able to "initialize" an item in the app's OnCreate. (I tried using <ListView>.getChildAt(0).setBackgroundColor, but inside of OnCreate, getChildAt(0) returns null.)
How do I "initialize" items in a ListView?
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Sep 11, 2012
So I had some sort of crash on my HTC Sensation where the phone rebooted, and all my whatsapp messages were gone. Whatsapp automatically backs up your messages every 24 hours, so I reinstalled to enable the backup.
1. After installation, when inputting information (after restoring your messages) and getting into profile info, I am stuck on an "Initializing: Please wait a moment..." box
2. This goes on forever
3. I have force closed, cleared cash, cleared data and tried again with no luck
4. I have uninstalled and reinstalled (and reboot the phone) with no luck
5. I have uninstalled and installed the latest version from the whatsapp website (which has a different file size than the play store one) with no luck
6. I have redone this WITHOUT recovering my messages with no luck (even deleting the back up messages folder)
7. I can actually receive notifications from whatsapp, showing messages from groups / people, though clicking it takes me back to "Initializing"
8. Sometimes I get an "android.process.acore is not responding. Would you like to tell HTC?". This may be a separate issue as it still continues to "Initialize" no matter what I press
I can see 28 messages from notifications, some which are very important and urgent. I am using an unrooted HTC Sensation with ICS
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Jan 25, 2014
while trying to sync the repo or downloading the sources i get the following error:
curl: (22) The requested URL returned error: 404 Not Found Server does not provide clone.bundle; ignoring.
But the process continues and a few minutes later i get the same error.
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Jul 19, 2012
My device is Chinese and has no brand. (with Android 4.0)
I changed some things in framework-res.apk, but not set the permission to 755 before saving in /system/framework/ so now the phone keeps resetting!
How do I change the permission of this file without the device to start??
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Jul 7, 2010
I'm creating a new class, using eclipse "New Java Class" dialog box. I can write the superclass I want (I can't find using "browse" button), but I can't write or select an interface to implement. I click "add" but ther is nothing to select. What I'm doing wrong?
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Jul 14, 2010
I'm just getting into Android development, and I have a question about communicating between a receiver class and an activity class. I'm very new to JAVA and Android so I hope I don't sound too stupid. I'm developing an application where I intercept an SMS message and then based on various elements of that SMS I might delete it once it's been saved to the inbox. I have a receiver class that intercepts the txt message, and I am also able to delete messages from my inbox with code in the activity class using a button at the moment. The problem I have is communicating between the receiver class and the activity class where the code to delete a message resides. I tried putting that code directly into the receiver class but as I'm sure most of you already know the BroadcastReceiver class doesn't seem to support what I need to delete messages. I've been searching for an answer to this for a while, but haven't been able to find anything. Honestly I'm not sure I know enough about JAVA and Android to even recognize a solution if I saw it.
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Jun 27, 2010
What I want to do, is be able to access the object neoApi inside the Neoseeker class, from its inner class RunningTimer. Now, in my code, you can see what I would think to work, but when I run my application, nothing pops up. Nothing inside my TextView, no Toast, nothing at all. How can I remedy this?
package com.neoseeker.android.app;
import java.util.Timer;
import java.util.TimerTask;
import org.json.JSONObject;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;.......................
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