Android :: Best Way To Save Large Number Of Checkboxes State In Droid?

Sep 11, 2010

I have some 34 checkboxes on one Activity which i have to mark and unmark. and I want to save the status of the each checkbox.

I want this persistently. So should i have a sqlite table or preferences ?

If sqlite table is recommended, then what should be the ideal table structure design?

Android :: Best way to save large number of Checkboxes state in droid?


Android :: Unwanted State Changes Of CheckBoxes In ListView

Apr 30, 2010

I am facing a very mysterious Problem. I am using a ListView with CheckBoxes that can be clicked to select people. The row layout is the following:

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="" android:orientation="horizontal" android:layout_width="fill_parent" android:layout_height="wrap_content"> <CheckBox android:focusable="false" android:onClick="onSelectPerson" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" android:layout_marginRight="5dip" android:layout_marginLeft="5dip"/> <TextView android:id="@+id/person_name" android:text="test" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center_vertical" android:textSize="18dip" android:layout_marginLeft="5dip"/> </LinearLayout>

As long as the amount of rows doesen't exceed the screen size (-> no scrolling) everything works just fine. But as soon as I have more rows then the screen size (-> some rows are hidden and have to be scrolled to). I have a very mysterious phenomenon: If I check the top row and scroll down some of the previously hidden rows are randomly checked too. If I scroll up again, again some of the before hidden rows are randomly vhecked (the CheckBox I clicked in first place may or may not still be checked). Also the registered onSelectPerson callback is only called for the CheckBoxes I really click. The other CheckBoxes just change their state to "checked" without calling the callback method. I have the same phenomenom on the Archos IT 5 and the Nexus One. This must have something to do with the ListView implementation but I can't quite figure out what the problem is.

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Android :: Save Current State Of Canvas As An Image In Droid?

Nov 16, 2010

I'm developing an application which allows user to edit an image and save that edited image as new image on sd card I want to get the current state of the canvas object.

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Android :: Droid Save Checkbox State In ListView With Cursor Adapter

Mar 9, 2010

I cant find a way to save the checkbox state when using a Cursor adapter. Everything else works fine but if i click on a checkbox it is repeated when it is recycled. Ive seen examples using array adapters but because of my lack of experience im finding it hard to translate it into using a cursor adapter. Could someone give me an example of how to go about it.code...

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Android :: Save State Of Droid Application When Back Button Is Pressed?

Sep 20, 2010

I have noticed while working in the emulator that whenever i get out of my app via any method other than pressing the back button, my toggle button (if pressed) will have its state saved and return to that state when i return to the app. im guessing its because its value gets saved in a bundle and reloaded when i return. when i leave the app via the back button, this does not happen and the toggle is always off when i return. is there any way to get the value of the toggle back if the user leaves via the back button, without having to save the value in a db table? alternatively, if my apps notification is in the status bar, i can be confident that the toggle should always be selected, so if there is no way to save the state, is there a way to find out if my apps notification is currently being displayed? then it would be easy to just set the toggle each time via a quick check of the status bar.

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Android :: Robust + Easy Way To Save / Restore Droid App Instance State?

Feb 19, 2010

In Android, you need to implement the following Activity methods so your application can be restored to its previous state if the OS decides to destroy then recreate your activity:

public void onSaveInstanceState(Bundle savedInstanceState)
public void onRestoreInstanceState(Bundle savedInstanceState)

The examples I've seen of implementing these methods is to use put/getBoolean, put/getInt etc. on the Bundle object (i.e. primitive objects only) to save the application state. This seems hugely error prone way to save your state for a start and I cannot see how this scales to storing complex objects without writing lots of code.

What options do I have for storing/restoring state in a robust and easy to implement fashion?

In case it's important, my application (a game) needs to store about 50 objects, which each store maybe 5 float variables and some store references to other objects. I don't particularly want to have to write save/restore methods for every class and subclass (maybe about 15 of these) I use. It would be ideal if I could just stick all my state relevant objects in an object called "state" and then just call save/load on "state" to handle everything.

Is using Java serialization an option? I've heard it's very slow, but is that a problem for save/restoring? Could I just write my data to the SD card? To a database?

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Android :: Save Number In SIM From Droid Application?

Aug 19, 2010

I am working on an android project and i have to save a phone number from my application into a SIM card. Can someone tell me if this is possible and how?

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Android :: Broadcasting SMS - Message - Large Number Of SMS Are Being Sent

Sep 30, 2009

There seems to be a limit to the number of SMS that can be sent programmatically. It seems to be hovering around 70 to 100 messages. After a batch of messages, when I try to resend a batch I get a warning message "A large number of SMS are being sent. Press OK to continue or Cancel to stop sending" This requires user intervention and impedes the program from sending SMS. Is there a way around this error message? Maybe a way to turn off the warnings?

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Android :: ListView Large Number Of Items - Best Practices

Oct 20, 2010

I am working with a ListView, custom adapter and a large number of items. I read in a book for Android that is was more efficient to use what it called the holder pattern. That is to create a wrapper class for each view in the list view that cached the objects in the view so as to avoid calls to findViewById because those are supposed to be expensive. My question is what is better? To have 50,000 objects GC'd every time the user scrolls or to make the 4 or five calls to findViewById per view? Below is my implementation of what the book suggested.

@Override public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView; if (view == null) {
final LayoutInflater inflater = (LayoutInflater)
view = inflater.inflate(R.layout.survey_item, null);
view.setTag(new SurveyItemWrapper(view));
} bindView((SurveyItemWrapper) view.getTag(), position);
return view; } private void bindView(SurveyItemWrapper surveyItemWrapper, int position)
{ final SurveyedItem surveyedItem = surveyedItems.get(position);
surveyItemWrapper.getCube().setText(String.format("%9.2f", surveyedItem.getCube()));
surveyItemWrapper.getShipping().setText(String.format("%d", surveyedItem.getShipping()));
surveyItemWrapper.getNotShipping().setText(String.format("%d", surveyedItem.getNotShipping()));
} private class SurveyItemWrapper { private TextView description;
private TextView cube; private TextView shipping;
private TextView notShipping; private View view;
public SurveyItemWrapper(View view) { this.view = view;
} public TextView getDescription() {
if (description == null) { description = (TextView) view.findViewById(; } return description;
} public TextView getCube() { if (cube == null) {
cube = (TextView) view.findViewById(;
} return cube; } public TextView getShipping() {
if (shipping == null) { shipping = (TextView) view.findViewById(;
} return shipping;} public TextView getNotShipping() {
if (notShipping == null) { notShipping = (TextView) view.findViewById(; } return notShipping; } }

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Android :: Dev - Save State

Sep 1, 2010

can someone helpme out with how to save state of the app when the screen orientation is changed i read the development guide at

But i dont know how to define the method collectMyLoadedData();

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Android :: ListView Scrolling - Array Contain Large Number Of Items

Jun 27, 2010

I have a ListView with a scrolling issue. The Array contain a large number of items. When I try to scroll down, the listview displays the first items again. For example, if the initial view shows 12 items and I scroll down to view the next three, instead of showing 4 through 15, if shows 4 through 12 followed by 1, 2, and three. Debugging the Adapter reports that getView return 4 through 15 just as I would expect.

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Android :: How To Save App State In Phone?

Aug 30, 2010

I am writing an app where I get all the data from the rest call and display all the data in a custom component list(based on Linear Layout) which is added to a LinearLayout. I write this code in onCreate of the activity. The problem is when I switch activity using startActivity, and come back to the calling activity (using startActivity) then onCreate is called again. I see onPause, onStop called when I call other activity. Is there any way that I can save the application's state?

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Android :: Save State In My Application

Jul 16, 2010

I am developing an android application in which,the first activity is that for Login. After successful authentication, user can see an activity with 4 Tabs. My problem is that when user taps on the home button,the application should terminate and when the user again starts my application, he should be able to see the Login screen again and after successful Login, user should be able to see the tab on which he was working before application terminated(i.e., save state for all the tabs).

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Android :: Save .app.Application State?

Aug 9, 2010

I've encountered a problem wile using my own subclass of I have numerous activities in my application and I'm running a custom ROM which consumes quite a lot of memory. What happens is when I launch a third party activity (Camera) my Application is killed. My Application subclass stores vital data for the whole app so it can't work without it. doesn't have any methods for saving or restoring application state. Activity does have them but they are not suitable.

How to perform save/restore state on Application subclass?

UPDATE I've managed to do so by filling a Bundle obtained from onSaveInstanceState and restoring values in onCreate. But is there any better way?

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Android :: Save State Between Orientations?

Sep 4, 2010

In a previous question I asked how I could display two different layouts for portrait and landscape orientations:

Problem switching to landscape orientation

Now I would like to know how I can save the state of my application before it goes into another orientation? I seem to lose this data any time orientation changes.

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Android :: How To Save State During Orientation Change?

Oct 12, 2010

I was looking at the way Android handles orientation change for my application (I discovered that it restarts the mainactivity on orientation change :| ). I've seen that you can ovveride the method protected void onSaveInstanceState(Bundle outState)to save stuff, then have the in onStart. The problem is that I've my view with custom objects and a listview using a custom adapter... Everything is in a ArrayList of these objects, but I've noticed that you can't put arbitrary objects in the bundle! So how do I save the state?

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Android :: Save Instance State For Dialogs?

Sep 24, 2009

I wonder what is the right way to implement this? Could anybody advice whether my solution is correct?

Activity is created
User clicks on button and dialog is launched (Dialog, not dialog styled activity)
User opens keyboard
we have onSaveInstanceState called where we save that our dialog was opened and all respective dialog input
we have onRestoreInstanceState and here we check whether dialog was shown, recreate the dialog with respective input.

Is it the right approach? or there is smth. that is done by Android and I am doing some redundant actions.

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Android :: How To Save State Of An Activity On An ActivityUnitTestCase

Jan 22, 2009

In an ActivityUnitTestCase I'm trying to do:


But on the save state call I get this trace:


Going through the ApplicationContext source code I've found this (


It seems the problem is that the activity token is not set. But here I'm puzzled, I don't know where to go next. Any ideas on how to fix it or workaround it are appreciated. I want to test that my application is saving its state correctly.

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Android :: Correct Way To Save State Of An Activity?

Jul 1, 2010

I have an Activity, which contains a bunch of check boxes and a submit button.

When the submit button is clicked, the activity will exit (finish() will be called). Before the activity exits, I want to save the states of the check boxes in the activity, so when the activity starts again, the check boxes can stay in their previous states. What's the correct way to save these states? Should I use SharedPreference.

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Android :: Save Instance State Of My Application?

Jan 11, 2010

As a follow on from my question on sharing state between Activities, how can I save the instance state of my Application? Since Application does not extend Activity, there is no onSaveInstanceState method to override.

NB: In advance, this is not a duplicate. Despite its name, How do I save an Android application's state? relates to Activity state

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Android :: Super Slow Apps Caused By Large Number Of Unending AsyncTasks

Aug 11, 2010

I have no idea, but my app is stalling sometimes completely (not responding to touching the screen) I thought I was following all the rules for threading, but my app is apparently slowing down the Sprint EVO! I have never used an app as slow as my own. I don't get an ANR dialog, though I think I probably should get getting one. I have no idea how to make this application run like every other app I've ever used -- Not freezing. Is it not a good idea to have one HttpClient and keep a static reference to it for all Activities that want to use it? I used to create a new one each time, and thought that changing it to one sped it up. None of my AsyncTasks ever end. If I go to Activity A -> B -> C -> D the first time it will be smooth. I can press back but when I get back to A, its completely frozen, not responding to anything. That when I took that screenshot. I really have no clue what I am doing wrong. Should I manually kill my AsyncTasks on Activity.onPause()?

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Android :: Save - Complex - Application State To Bundle

Apr 30, 2010

This is a bit complicated to explain (and my first post), so bear with me please: I am currently trying to figure out the best way of saving my application's state in a bundle on the onSaveInstanceState event (working on a game). My application's state is based on a "world" class which contains various objects. Among these objects there is a creature object which contains bitmaps (Bitmap object)(allowing me to draw the various sprites of the creature when it's walking with more flexibility and accessibility).

Bit of creature constructor Java:


After looking around for a few hours I found that serializing the world object (and all its sub-objects) was an acceptable way of saving it in the bundle. Unfortunately it appears that we can't serialize bitmaps and considering they're a part of my "creature" I can't seem to see a workaround.

Here come my questions: 1- Am I doing something fundamentally wrong? (not supposed to save bitmaps in objects? supposed to handle bitmaps in a separate class which I don't pass on the bundle and reload my bitmaps when restoring the application? ...) 2- Is there another way of passing my "world" object into my bundle (would using Parcelable work?)

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Android :: Phone Won't Save Current State Of An Activity / Way To Do

Nov 17, 2010

I am trying to save some values in the onSaveInstanceState(Bundle) method of my activty by following the example here: How do I save an Android application's state?

But it doesnt seem to load it from the Oncreate(). the bundle object is always null but whenever i call another activity, it does indeed go into the onSaveInstanceState method to save my values.

Now i read that question i just posted and someone noted how they could not get it to work in an emulator? unfortunately that is all im working on. On an emulator and cant test the app on the device as i have no device available to me right now And the web services i am interacting with are in a local VM on my work machine that cannot be accesses remotely at the moment.

My question is, is it true that saved bundles dont work on emulators? I also noticed how when i do dismiss or bring up a new activity , the activity calles onPause and then onStop. when i bring back the same activty, it goes straight to onCreate?

now according to the docs here That is correct in terms of what the lifecycle diagram shows but if you read below that diagram on the onStop() section it says the next step it goes into is either onRestart() or onDestroy()? no mention of onCreate? Type on the docs?

Anyways here is my onSaveInstanceState() and onCreate() both in the same activity: code...

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Android : Save (large) Edited JPEG With Full 24bit Colordepth Without Getting OutOfMemoryErrors?

Apr 13, 2009

I managed to handle a full size image (2048x1536) (moving around, zooming, some colorfilters, etc). However, i can only load these images in memory as RGB_565, one at a time. I try to free as much bitmap memory as possible (by recycling every possible bitmap cached/ open in my app), and then load the full-sized image in RGB_565 format. This works well.

The user can make some modifications (color balance, brightness, etc) and I like to save the resulting image in a JPEG file. However, on screen, all edits are shown in RGB_565. You can see the posterization because of the reduced pixel-depth. The quality degradation on the screen is a minor problem. My main problem is to apply these edits to the actual and higher quality ARGB_8888 data of the original JPEG file.

Trying to load a ARGB_8888 JPEG file with size 2048x1536 is not possible. I get an out-of-memory error. Is there any way to apply color-filters to ARGB_8888 data (instead of RGB_565) so that i won't lose a lot of image-quality when trying to save modifications into a JPEG file?

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Android :: How To Save An Instance Of A Custom Class In On SaveInstance State?

Jul 3, 2010

I created an instance of a custom class RestaurantList to hold my data (a list of restaurant data received from a web service as json data).How can I save it in onSaveInstanceState? Code...

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Android :: Save State Of Checked Item In ListView Having Checkbox

Sep 29, 2010

I'm new to android, please help me how to save the state of checkbox,


I've ListView with checkbox, three textview and again checkbox. I wish to save the checked state of item(s),

how to save the state of checkbox.

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Android :: Save My Custom View's State After Orientation Change?

Oct 20, 2009

I have a custom View, what is the proper way of saving / restoring it's state after orientation change. I know I should implement onSaveStateInstatnce() and onRestoreInstanceState() methods, but how exactly (with which argumets) and when I should call them?

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Android :: Singleton Objects To Save State Or Share Data Between Activities?

Nov 24, 2010

It would be nice if StackOverflow had a section where we could post tutorials like mine so that I can answer literally hundreds of questions that have been asked here with a single blow. See... every day I read questions about how to pass complex objects between activities, how to save state so that your app can resume after orientation change, how to update listviews when the data changes, etc, etc. Here is the second part of a tutorial series I posted on my blog... I hope that you actually read it... because I haven't seen any examples like it anywhere... and it has changed how I think about developing for Android across the board. The question is... is there a downside or negative affect of developing like this?

Beyond Smart Lists - How Observable Singletons change the game. Please read through both of these tutorials carefully... I will answer any questions about it here that I can... I really want to know what you think about this and if it might solve issues for you. NOTE TO MODERATORS: there are no advertisements of any kind on my blog.. so don't just close this because you think I am spamming somehow... I am not going to duplicate my post here.

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Motorola Droid :: Save Folder And Contents As Direct Dial Number

Mar 27, 2010

I have been trying out new ROM's and it's been fun. Here is my biggest headache with doing this. I have about 10 contacts that are Direct Dial (speed dial to the rest of the world). What I do is put them in a folder as a shortcut to prevent accidental dialing. But I have to constantly redo this set up. Is there a way to save a folder and it's contents, such as direct dial numbers, to my sd card and bring it back with each new ROM or launcher? Starred folder doesn't work for me as it's more clicking when I am driving. The app Direct Dial still takes several clicks.

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Android :: How To Save Activity's State When Exiting - Android?

Feb 22, 2010

I have a basic app with text inputs, a spinner input, and a second spinner input whose array depends on a setting changed in the Options menu. Currently, when I press Home or press Return while in my app, I either return to the desktop or cycle back through old inputs i put in recently. How can I prevent my app from opening multiple instances of itself so that there is only one instance running at any given time, and then how can I save the data entered into inputs, and the settings chosen in my option menu? I'm a bit new to Java, so I apologize if this is a simple problem.

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