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  • Generic Database table design

    - by Gazeth
    Just trying to figure out the best way to design my table for the following scenario: I have several areas in my system (documents, projects, groups and clients) and each of these can have comments logged against them. My question is should I have one table like this: CommentID DocumentID ProjectID GroupID ClientID etc Where only one of the ids will have data and the rest will be NULL or should I have a seperate CommentType table and have my comments table like this: CommentID CommentTypeID ResourceID (this being the id of the project/doc/client) etc My thoughts are that option 2 would be more efficient from an indexing point of view?

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  • Android Static Variable Scope and Lifetime

    - by Edison
    I have an application that has a Service uses a ArrayList to store in the background for a very long time, the variable is initialized when the service started. The service is in the background and there will be frequent access to the variable (that's why i don't want to use file management or settings since it will be very expensive for a file I/O for the sake of battery life). The variable will likely to be ~1MB-2MB over its life tie. Is it safe to say that it will never be nulled by GC or the system or is there any way to prevent it? Thanks.

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  • Expression parser library for Android.

    - by Malx
    What is the best way to evaluate simple conditional statements like: "a>b" ? "x-4<10+y & y>x" ? Expressions are loaded from external file. Variables are set in application. Syntax used is not essential. It may be "&" or "and" or any other supported with language/library. I need to take different action depending on result of evaluation - is it true or false. Could I use any parser already included with Andorid? Is there some way to use JS "eval" from browser component? Is it possible to use sqlite expressions to get true/false result without selecting anything? Those libraries are implemented in native code. Will it be faster and less battery expensive?

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  • Android application error

    - by Aswan
    Hi folks i developed application with map service and webservices when i run application its became very slow and continuosly it is showing activity not responding force close or wait how to resolve this issue Thanks in advance Aswan

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  • Android: implementing sliding cards in widget

    - by DroidIn.net
    I have a widget that periodically updates itself (hourly) to display top result of search query. I would like to extend it so it captures several top results and then loops through these. The best example would be Genie News and Weather widget for which I was unable to find a source code. QUESTIONS: What would be a good way to implement the animation? I'm thinking ViewAnimator + timer, but is there maybe a better way, say FrameLayout + alerts? I'm already using AlertManager to periodically pull search results for the widget How bad such arraignment would affect phone's battery life?

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  • (android) rows of buttons that take up the entire width of the screen

    - by user558043
    I am trying to make 3 rows of 4 buttons each that will take up the entire width of the screen. I have tried Linear Layout but have trouble adding a second row and from what I have read nesting Linear Layouts is bad practice. I tried to use relative layout several times but I cannot manage to get the buttons to fill the width of the screen because it ignores layout_weight, I then tried nesting linear layout in relative layout but layout_weight is still ignored. What is the best way to accomplish this?

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  • Problem with URI matcher in Android.

    - by Lunchbox
    I have an authority string defined as such: public final static String AUTHORITY = "dsndata.sds2mobile.jobprovider"; Followed by an edition to the UriMatcher: uriMatcher.addURI(JobMetaData.AUTHORITY, "/JobNames/*", JOBNAME_SINGLE_URI); The uri that gets passed to the switch is: content://dsndata.sds2mobile.jobprovider/JobNames/test This falls through the switch and hits the default (which throws an IllegalArgumentException). Am I missing something? I've searched and can't find anything that would account for the mismatch.

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  • Using date functions in android application?

    - by rob
    Hi there, I am displaying some event data based on the todays event and a list of events in a week. Currently I am displaying all the events in form of list from the file, As the file contains out dated events as well but I want to display on the basis of today's date events and a week events then week after. In short I want to restrict the list on the basis of this and extract information. I know there is a class java.util containing Date class, but need some quick idea and help how can I do this? Can anyone quote example? Thanks

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  • Customers and suppliers database design issue

    - by hectorsq
    I am developing a web application in which I will have customers and suppliers. Initially I thought on using a Customers table and a Suppliers table. Then when I was thinking on bank transactions, I noticed that each transaction needs to refer to a customer or a supplier, so I thought on using a single table named Business in which I will save both customers and suppliers. If I use Customers and Suppliers tables when I want to list the bank transactions I will have to search in both tables to get the company name. If I use a Businesses table I will have to use a business type column, and have the union of possible fields for all businesses types. Any suggestions on the design?

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  • Android app crashes on second run

    - by Nick
    I have been working on my app and it runs on the simulator fine. I loaded it into my phone and now I have a problem. It runs fine when I first start it and also if I pick home and then restart it; however, if I use the back arrow and then restart it it crashes on that time, but will work out the next time I start it. I think it has to do with some kind of memory build up, but I verified onDestroy is being called, I figured that deletes everything my program created, right?

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  • Android: Sorting a merged cursor

    - by tonyc
    Hi, I'm wondering if there's any way to merge two cursors together and then resort them. I can easily merge two cursors together by using a MergedCursor, but that doesn't sort them. I have two sets of contacts in two separate cursors (with totally different schemas) and I want to merge them and sort them by name (the name column is different in the two cursors). Is this possible? Thanks, Tony

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  • android: error on SQLiteDatabase rawQuery (fetching data)

    - by Jin
    So I have a SQliteDatabase mDb. It only has one column, and its data are Strings for previously saved inputs. I'm trying to populate all the data from mDb into a String[] for AutoCompleteTextView (so that the autocomplete is based on previous inputs), and here's my code to get all of the String. public String[] fetchAllSearch() { ArrayList<String> allSearch = new ArrayList<String>(); Cursor c = mDb.rawQuery("select * from " + DATABASE_TABLE, null); c.moveToFirst(); if (c.getCount() > 0) { do { allSearch.add(c.getString(c.getColumnIndex("KEY"))); } while (c.moveToNext()); } String[] foo = (String[]) allSearch.toArray(); if (foo == null) { foo = new String[] {""}; } return foo; } my CREATE_TABLE command is private static final String DATABASE_CREATE = "create table " + DATABASE_TABLE; .. public void onCreate(SQLiteDatabase db) { db.execSQL(DATABASE_CREATE); } But for some reason the line mDb.rawQuery(...) is giving me "no such table found" exception, and for the life of me I can't figure out why. Any pointers?

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  • update SMS body, but not Date

    - by everinsearch
    I'm trying to update body of all sms on Android device with getContentResolver().update(Uri.parse("content://sms"), values..... query but after request done, also updates message creation/received time. How i can update message but leave old message date? I have tried send to update query ContentValues values = sms values oject; values.put("body", updatedBody); values.put("date", oldValues.getAsString("date")); but it does not help.

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  • Android thread handler NullPointerException

    - by Realn0whereman
    So this null pointer is confusing me. I believe it is a scope issue. My main activity looks like this: public class App extends Activity { ProgressDialog progressDialog; ProgressThread progressThread; Then inside of the oncreate I do this: ProgressDialog progressDialog = new ProgressDialog(this); progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER); progressDialog.setMessage("Fetching Images..."); ProgressThread progressThread = new ProgressThread(handler,mImageIds,mImages); progressThread.start(); progressDialog.show(); THEN inside progressThread which is a separate class I do mHandler.sendMessage(mHandler.obtainMessage()); Now up until this point i believe it behaves as it should. I have my handler hanging out in class scope right underneath my oncreate final Handler handler = new Handler() { public void handleMessage(Message msg){ progressDialog.hide(); progressThread.interrupt(); } }; The program thinks that progressDialog and progressThread are declared, but are null. Why would they be null if I instantiate in my oncreate.

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  • android : Dynamically changing the content of tab

    - by Jomia
    I want to change the content of a tab? when tha tab is created i set the content of the tab by setContent() method. But if I click again, I want to change the content that means change to another activity. I used setOnTabChangedListener() method, but I am not sure about how to set the content to another intent? Resources res = getResources(); TabHost tabHost=getTabHost(); tabHost.addTab(tabHost.newTabSpec("tab1").setIndicator("HOME").setContent(new Intent(getBaseContext(),homeGroup.class))); tabHost.addTab(tabHost.newTabSpec("tab2").setIndicator("ABOUT US").setContent(new Intent(getBaseContext(),aboutusGroup.class))); tabHost.setCurrentTab(0); tabHost.setOnTabChangedListener(new OnTabChangeListener() { @Override public void onTabChanged(String tabId) { //here i want to set the content of each tab to another intent // for 'tab1', change to home.class // for 'tab2', change to aboutus.class //how to set these? } }); Please help me.. Thank you..

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  • ANDROID SAX Parser issue

    - by Chris Watson
    Since I am new to java programming, I need a bit of help with this. I stuck on this one issue and can't continue until I get this to work. I am trying to make a string from that includes a preference int. I saved the data and can display the int (just sample code): SharedPreferences prefs=PreferenceManager .getDefaultSharedPreferences(this); list.setText(prefs.getString("list", "22")); now, I have a xml parser that is pulling a url correctly as a static string: public static String feedUrl = String.format("http://www.freshpointmarketing.com/iphone/objects/XML/AND.php?ID=%d", 22); Works great... now my issue...... I need to have the preference "int" become the variable in the string, thus making it not static. static SharedPreferences prefs=PreferenceManager.getDefaultSharedPreferences(this); static int myVariable = prefs.getInt("list1", 22); public static String feedUrl = String.format("http://www.freshpointmarketing.com/iphone/objects/XML/AND.php?ID=%d", myVariable); If I take out all static references, I get an error on this: private void loadFeed(ParserType type){ try{ FeedParser parser = FeedParserFactory.getParser(type); long start = System.currentTimeMillis(); messages = parser.parse(); long duration = System.currentTimeMillis() - start; Log.i("AndroidNews", "Parser duration=" + duration); String xml = writeXml(); Log.i("AndroidNews", xml); List<String> titles = new ArrayList<String>(messages.size()); for (Message msg : messages){ titles.add(msg.getTitle()); } ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.row,titles); this.setListAdapter(adapter); } catch (Throwable t){ Log.e("AndroidNews",t.getMessage(),t); } } thanks

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  • Windows Azure Mobil Services first connection in Android

    - by egente
    my application based windows azure mobil services. Application connecting time is well normally but when login to application first time azure mobile services connection is very slow like 10 second, after connection speed is normally. how can i solve this problem? my codes; private MobileServiceClient mClient; private MobileServiceTable<products> mProductsTable; mClient = new MobileServiceClient( "https://example.azure-mobile.net/", "aaaaaaaaaaaaaaaaaaaaaaaa", this).withFilter(new ProgressFilter());; mProductsTable = mClient.getTable(products.class); mProductsTable.where() .execute(new TableQueryCallback<products>() { public void onCompleted(List<products> result, int count, Exception exception, ServiceFilterResponse response) { if (exception == null) { } else{ Toast.makeText(Product.this, "Ops!!! Error.", 1000).show(); }} });

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