Android :: FileOutputStream And Exception Handling
Oct 11, 2010
I'm trying to run this piece of code inside my onCreate method as an initial test into writing private data for my app to use. This code is straight out of the Android SDK development guide located here (http://developer.android.com/guide/topics/data/data-storage.html#filesInternal)
CODE:................
However, this code give me errors for the 3 lines of code at the bottom. The error is an unhanded exception. The suggested quick fix is do to the following:
CODE:..........
But after doing that I get an error for the bottom two lines which states that fos may not be uninitialized. How can I fix this code? It's kind of annoying that the Android SDK gives you an example that doesn't even work.
I can't say I'm an expert at exception handling either.
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Aug 9, 2010
I read somewhere not to exception handle when developing in Android, is that true?
If one does need to exception handle are there any logging tools for 2.1 and above?
If shouldn't exception handle, why is it not recommended to at least use the below?
try {body-code} catch (exception-classname variable-name) {handler-code}
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Aug 18, 2009
AsyncTask blocks exceptions? Please see the below code. My "getOffersStatus" function catches certain exceptions and show them in a AlertDialog. But instead of getting my custom exceptions message I get default error dialog "The application ... has stopped unexpectdly. Please try again".
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Nov 24, 2010
I'm developing a media file app that is meant to play sounds stored in my raw folder. There are about 32 sounds in all. And this is what i'm doing on the click of each button:
CODE:.......
I get a runtime exception saying "app stops unexpectedly" with the follow messages in my logcat window:
CODE:................
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Sep 3, 2010
Have a dump_log which points to "Out of Memory exception". How do I fix the issue as we have a number of applications running on the Android target?
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Jun 22, 2010
I'm trying to catch a login exception thrown by the class that readerAccount belongs to in the code below.
CODE:......................
However, the only part of the catch statement that happens is is the Log.w() function. I was under the impression that during a catch statement, you have the opportunity to recover from errors, but the program blacks out the screen altogether and the dialog is not displayed, nor is the Toast.
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Aug 13, 2010
I am using AsyncTask in my application.
The problem is that when server is down the AsyncTask throws an Interrupted exception. How to track that whether server is down or not.
CODE:.........
This same problem also occurs when the handset is kept idle for some time then keyguard gets lock and I suppose that WI-FI also gets disabled. So, when I enable the keyguard and if my application is in foreground then it gives the same exception. What should I do in order to remove this exception?
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Sep 16, 2010
This is the sequence part of this question: http://stackoverflow.com/questions/3674441/combining-2-images-overlayed
so the problem is: if the image size is too big - it'll got an exception (out of memory exception)
what i want is, to handle even if the handset got the lower spec hardware, it doesn't go to that exception (but it'll take a longer time to process the image) is it possible to do that?
The code snippet is like this:
CODE:......
And that block of code is inside the async task.
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Sep 4, 2010
I have class A in which I have a method openfileConnec().
It was written like the below:
CODE:...............
Now I come to class B where I will call this method like the below:
CODE:.............
I was asked a question in an interview as follows:
Why does the method have a throws Exception in its declaration? Is it that on of the methods called in the implementation throws the base class exception? Also If we get a exception during calling the method (fileConnect( )) control goes to catch block. After executing catch where should the control go, what should be sent to base case?
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Aug 14, 2010
We are converting out suite of iPhone apps written in .NEt MonoTouch to Android.
How do we catch, then publish exceptions so that they are reported via the Android Market?
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Oct 4, 2010
I have written my own Exception (MyException) and implemented Logging and showing Error Messages in Form of Toasts. Here is the shortform of it...
CODE:............
Everything was fine until I now implemented Threads where Exceptions are being thrown and caught.
You probably already have seen, that I played with the Looper Class, but honestly I don't know how to make it work. Is that the right approach? You also can see that I already store a reference of the ApplicationContext in my Controller. Shall I do it with the ActivityContext as well and than make the Toast from this ActivityContext? (But I heard that this is not a good practice in terms of performance)
Update
Is this the way I should go, when an Exception is being caught in a Thread in an Activ ity?
CODE:...........................
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Jul 10, 2010
I am trying to make APP native code for Android. The Native code is in cplusplus. Whenever I try to make, the following error appears.
H236Plus.cpp:135: error: exception handling disabled, use -fexceptions to enable
How do I use -fexceptions to enable exception handling, and where do I use it?
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Mar 10, 2009
I am running android server application which is listening to port 4444 to retreive the file.I want to receive the file sent from Desktop socket client application. To perform this task I used following code as Android socket server. But execution stops infinitely at the
CODE:..................
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Jul 14, 2010
I created a sql lite database with the following columns:
static final String dbName="demoDB";
static final String tableName="Employees";
static final String colID="EmployeeID";
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE "+tableName+" ("+colID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
colName+" TEXT, "+colAge+" Integer);");
I want to select all the records in the database like this and display them in a gridview:SQLiteDatabase db=this.getWritableDatabase();Cursor cur= db.rawQuery("Select "+colName+", "+colAge+" from "+tableName, new String [] {});String [] from=new String []{DatabaseHelper.colName,DatabaseHelper.colAge};
int [] to=new int [] {R.id.colName,R.id.colAge};
SimpleCursorAdapter sca=new SimpleCursorAdapter(this,R.layout.gridrow,c,from,to);
GridView grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(sca);but i receive the following exception:java.lang.IllegalArgumentException: column '_id' does not exist.the db table does not have a column with name '_id'so what is wrong with this code
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Sep 2, 2010
Android device is much slower and have much lower memory compare to PC/server, So what is the best way to handling XML in Android? And I have a set of very complex xml needed to parse. both SAX or DOM will cause too much code. Anybody have good suggestion? I want to make it clean and fast.
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Apr 6, 2010
I'm using a PostMethod, and wondering what try/except handling I should use.
The exception handling here seems to work okay in most scenarios, but is there anything I might be missing? In particular, I'm wondering whether this handles the network connection going down midway through the upload.
CODE:...................
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Jan 1, 2010
I've been wondering if Handcent is supposed to move all my pictures to the top of each thread? And is there anyway to save the pictures with Handcent?
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Jun 3, 2010
From the documentation regarding the android:configChanges='orientation' attribute of the activity tag in the manifest:
Using this attribute should be avoided and used only as a last-resort. Please read Handling Runtime Changes for more information about how to properly handle a restart due to a configuration change.
Why does it say this?
In the case of threads and networking requests via a service API library, a request could be made with a reference to the original Activity, and then an orientation change could occur, leaving the thread pointing to the old Activity.
While this can be fixed, it's tedious and ugly compared to just handling the configuration changes yourself.
Why should it be avoided?
I guess I should also ask: would this be an acceptable reason for doing the orientation configuration changes yourself?
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Sep 22, 2010
I'm trying to do is draw circles around two points that are being touched, and as the fingers drag along on the screen, have these circles follow each finger.
However, I'm getting some weird behavior that I can't figure out. So when I place two fingers on the screen I get my circles no problem. When I drag around with the two fingers everything works like I want it. However, if I lift the first finger, everything stops redrawing, and the second finger that is still on the screen stops being tracked. If I place the first finger back on, everything behaves good again. I figure I must be handling the two fingers poorly.
Also, if I have two fingers on the screen, and I lift and touch the second finger, everything behaves well. It's only in the case where I have two fingers and I lift the first one do I see a problem.
CODE:........................
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Feb 7, 2010
I know how to use handlers to update UI elements such as progress bars toasts etc. The problem I am having is when the context goes away such as the user pressing the back button or the Activity finishing for some reason. This causes my application to crash often. I tried using
getApplicationContext()
(Thinking that this would be available throughout my entire application) but this did not work, ever - instead my application crashed! I put try catch blocks around all UI update code, this works but is it necessary? What is the bast way to handle this?
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Jun 16, 2010
I have some required try/catch statements in my application that in my testing never get called. I have sent them up with:
Log.e("messaage", e.toString());
For my debugging and now that I'm ready to release I am not sure if I should take that out or not. I see in android market you can get error/crash reports and while I do not expect my app to catch any errors, I would like to know if that happens and wondering if I need specific syntax for that. My question is what should I do in the catch statement for these errors? I'm already handling the error from a user standpoint...
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Mar 23, 2010
I want to handle key press and long key press for the key code KEYCODE_CALL(dial button). can any one suggest me how this in android 1.5(API level 3).
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Mar 8, 2010
in my app a background service starts and from that service i want to set Status bar notification, that the service has Started following is the Notification is displayed in Status bar But whin i click on that MyClass.class is not fired.And in log cat it shows
"Input Manager Service Window already focused ignoring focusing ...." Code...
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May 11, 2010
I would like to build an application that caters for multiple accounts (eg. home, work) and account types (e.g. ISP, VoIP, Mobile). Essentially, I would like to get the user to create the accounts they want and then have all the accounts listed on the start page grouped by type.
For example:
ISP:
- Home
- Work
Mobile:
- Mum
- Dad
When you click on the account, it would take you to another screen where I do a bunch of calcs and display the results.
I currently do this via multiple apps but am looking at consolidating into the one app. I am just not sure where to start or how I go about achieving this? The way the Contacts app works is a good example of what I am wanting to do.
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Apr 18, 2010
We have created an AppWidget that takes user inputted text into an EditText and displays a calculated amount of text inside a TextView on the Home Screen. We calculate the amount of text based on the AppWidgetInfo.minWidth, minHeight attributes. We do this to simulate scrolling; we cut up the user-inputted text into chunks that will fit into the widget and swap them based on button clicks.
When we save the widget with the device in Landscape mode, it calculates the appropriate amount of text for Landscape mode and displays it in the widget. The problem is when the user changes orientation of the device to Portrait mode (without opening the widget and resaving the text), the calculated amount of text for Landscape mode is still displayed. This also happens in the vice versa case (the user is in Portrait and saves, etc.)
How can we tell our AppWidget to recalculate the amount of text displayed on screen orientation change? Is this possible? How would you solve this problem?
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Jul 6, 2010
My project is working fine when i hold my HTC device vertical.But the moment i rotate my screen 90degrees , it throws a force close error.Starts all over again, runs fine until i again change the orientation.How do i handle it ?
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Jun 16, 2009
Just started working with the webview. The issue is performance following rotation. The WebView has to reload the page, which can be a bit tedious.What's the best of of handling an orientation change without reloading the page from source each time?
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Mar 16, 2010
I'd like to know how the key event is handled in Android platform.From 'when user type key 'a' on software keyboard',To 'view draw the character 'a' on itself'.Probably, the key event is generated by IME,And it will be sent to parent view,Finally, view(such as EditText) displays chracters.Please somebody explains about these entire key event handling process.
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Dec 1, 2009
I create a CursorAdapter to provide data for my ListView.
I implement the bindView() method to show data in a row of my Listview.
But at the end of my bindView, I add an clickListener to it. But when I run it on emulator, I don't see any print statement.
Can you please tell me how to add event handling in a row in ListView? code...
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Oct 23, 2010
Understanding how to declare activities in the manifest file, how to set the appropriate flags when starting them through intents, is quite challenging in all but the default cases. The combination of all these settings and flags is daunting. I've been developing for Android for over a year now, have read the application fundamentals and the reference guide for 'Intent' quite a few times and still I don't have a good grasp of which manifest settings or intent-flags should be used for starting activities in many situations (workflows). Is there some source/document that can explain certain work-flows (ways of navigation through activities and tasks), that shows examples of how to configure and start activities?
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