Android :: GetView Method Used And Where Is It Getting Called?

Sep 1, 2010

I am new to Android development and have been following the tutorials available on the Android website. I am currently on the section of tutorials for Views, specifically the one for Grid Views: Hello, Grid View Tutorial.I am having trouble understanding how views are made through an adapter. I understand that you must override the getView() method in your adapter class and in this method is where you define how your Views are set up. What I don't understand is where does getView() actually get called? Perhaps I've got the wrong kind of mentality here, but in the code below (the Grid View tutorial) I don't see any calls to getView() (or any other things used in the adapter class such as getCount()).

Android :: getView method used and where is it getting called?


Getview Called When Scrolling Listview

Oct 31, 2013

I am having problems when scrolling a ListView. Each item in the ListView shows an image downloaded from internet.Whenever I scroll the ListView, it calls the method getView(int position, View convertView, ViewGroup parent), causing the image to be downloaded again.

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Android :: Invoke GetView Method In BaseAdapter In Droid From Another WebService Bean?

Mar 19, 2010

How to invoke the getView method in the baseAdapter in Android from another WebService Bean?

The adapter in my code as follows, I extends the base adapter code...

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Android :: Android 1.5 - Asynctask DoInBackground Not Called / Method Called

Oct 26, 2010

I am running into an issue with the way my asynctasks are executed. Here's the problem code:

firstTask = new background().new FirstTask(context);
if(firstTask.execute().get().toString().equals("1"))
secondTask = new background().new SecondTask(context);

What I'm doing here is creating a new asynctask object, assigning it to firstTask and then executing it. I then want to fire off a separate asynctask when the first one is done and making sure it returns a success value (1 in this case). This works perfectly on Android 2.0 and up. However, I am testing with Android 1.5 and problems start popping up. The code above will run the first asynctask but doInBackground() is never called despite onPreExecute() being called. If I am to execute the first task without the get() method, doInBackground() is called and everything works as expected. Except now I do not have a way to determine if the first task completed successfully so that I can tell the second task to execute. Is it safe to assume that this is a bug with asynctask on Android 1.5? Especially since the API says that the get method has been implemented since API 3. Is there any way to fix this? Or another way to determine that the first task has finished?

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Android :: Method Called After Release

Sep 22, 2010

I'm getting this error ( in the end of this post) which I guess I understand it's because I'm calling something after releasing it.. but I can't find a wy to work it around.I've tried all combinations.. I've tried: mCamera.setPreviewCallback(null); This class, where the surfaceview is implemented can be accessed by 2 different classes one that doesnt implement surfaceview and other that does the error just shows me when I go from the activity that uses the camera to the activity that also uses camera.I don't know what else to do.

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Android :: Is OnUpgrade Method Ever Called?

Jul 2, 2010

Is the onUpgrade method of SQLiteOpenHelper ever called? If so, when is it called and by what? Or if it is not called by developers, then why is it there? What should be done in the method I have seen examples where it drops all the tables, but then a comment says that dropping all the tables is NOT what you should do.

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Android :: OnRestart Method Not Called On Restart

Apr 15, 2010

I'm writing a Tetris application on Android for my bachelor thesis at the University of Hasselt. Currently I have a working Tetris base game, but it just keeps on ticking when the activity gets in the background. I'm trying to fix this by overwriting the onStop()and onRestart()methods.when I press my home button on my device I will go to my home screen and onStop() is called. Because the gamemode is now "PAUSE", the game wil not tick anymore. But now, when I longpress my home button and select my tetris activity again, the activity pops up, but it isn't ticking! This is because the onRestart() is never called when I return to play my application.What is the reason that this method is never called? Am I understanding the activity lifecycle wrong?

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Android :: OnServiceConnected Never Called After BindService Method

Mar 21, 2010

a service started by a broadcast receiver starts an activity. I want to make it possible for this activity to communicate back to the service. I have chosen to use AIDL to make it possible. Everything seems works good except for bindService() method called in onCreate() of the activity. bindService(), in fact, throws a null pointer exception because onServiceConnected() is never called while onBind() method of the service is. Anyway bindService() returns true.The service is obviously active because it starts the activity.I know that calling an activity from a service could sound strange, but unfortunately this is the only way to have speech recognition in a service.

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Android :: Stopping Method To Be Called Twice If Already Running

Mar 3, 2010

I'm trying to prevent my application to call the same method twice in the event of a double-click, or if the user presses different buttons quickly, almost at the same time.I have clickable Views, acting as buttons, that call the same method but passing different parameters.Inside this method I'm creating a new Thread, because it queries a web server for the result.The problem is that upon two quick clicks, the method is fired twice, two threads are created, and consequently two new activities are created. That makes my app crash.But this only seems to work on slower phones like the G1, I tried on Nexus and before it set blocked = true, the second request has was granted. So is there any way I can block the method being called if it's already running, or if the thread has started so it wont create a new one.

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Android :: How To Find What Hook / Method Is Being Called In Framework?

Mar 5, 2010

I was wondering how should I proceed to debug while working with frameworks. Like specifically how can i tell which method is being called when a particular event happens.

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Android :: Calling An InputMethod Method When A BroadcastReceiver Gets Called

Feb 19, 2010

I added a BroadCastReceiver to my application.I want to call my inputMethod's method but I can't find a way to access it's instance.but I couldn't find a way to get the the InputMethod instance from the InputMethodManager.Is doing a singleton the only way to access it?

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Android :: Extended SurfaceView's OnDraw Method Never Called

Apr 21, 2010

I'm trying to modify the SurfaceView I use for doing a camera preview in order to display an overlaying square. However, the onDraw method of the extended SurfaceView is never called.

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Android :: Which Method Is Called When Press Back Key On Phone?

Nov 24, 2010

i have an app that haves a lot of activitys, all created with ONACTIVITYRESULT.which method is called when i press back key? i need to know it because i have to override/implement code on it

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Android :: Is It Normal For OnCreate Method To Be Called Multiple Times?

Aug 27, 2010

I have some code in the onCreate method an Activity and noticed that it is being called three times. Is it normal behaviour?

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Android :: Voice Recognition Activity Called In OnCreate Method / Causes App To Load Slowly

Oct 1, 2010

In my android app I call the voice recognition in my onCreate method of my startup activity. I have made it a preference to start up with the voice control or not. However, the app takes about 5-7 seconds to load when voice recognition is on. When it is off, the app starts almost instantly. Below is sample code, I have added Free_Form, max_results 1, and a custom prompt to mine.Why would calling the normal android speech recognition take sooo long to load in my OnCreate method?

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Android :: GetView Vs BindView In A Custom CursorAdapter

Aug 20, 2010

I'm watching this video http://www.youtube.com/watch?v=N6YdwzAvwOA and Romain Guy is showing how to make more efficient UI adapter code using the getView() method. Does this apply to CursorAdapters as well? I'm currently using bindView() and newView() for my custom cursor adapters. Should I be using getView instead?

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Android :: Override GetView In SimpleCursorAdapter Gives NullPointerException?

Mar 8, 2010

I'm trying to change the content of a row in ListView programmatically. In one row there are 3 TextView and a ProgressBar. I want to animate the ProgressBar if the 'result' column of the current row is zero.

After reading some tutorials and docs, I came to the conclusion that LayoutInflater has to be used and getView() - overriden. Maybe I am wrong on this. code...

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Android :: Display Every Other String Within View GetView()?

Jul 19, 2010

I've made a customAdapter that accepts an ArrayList. The ArrayList contains a title and then a link. code...

I'm wanting to display the title and then have the on click listener to have the link. I'm having trouble however figuring out a way to do this.

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Android : Leaking Bitmaps From Adapter's GetView

Mar 31, 2009

I definitely have a memory leak problem and i'm trying to figure out there. After 6-10 config changes i'm getting out of memory in regards to BitmapFactory. I'm kind of suspect that this is going on within adapter. I have a listview . ListItems are an thumbnail image ( ImageView ) and TextView for text.

Here is the getView code.

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

And get ThumbnailBitmap() is basically BitmapFactory.decodeByteArray ..

Is it possible that i'm leaking drawables ? Heap is not increasing by the way .

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Android :: First 6 ListView Elements Are Continuously Being Invoked With GetView

Aug 18, 2010

When I check my logs, when using ListView, I see, that getView() method of a custom adapter is continuously invoked on first 6 elements, even if I scroll to the very end of the list.

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Android :: Detect In An Adapter When Getview() Returned View?

Jul 15, 2010

I have a list and i want to check is the view is returned so i can call loadingAnimation.start() to make a imageview insite listview animate
Let me tell you what i mean.. code...

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Android :: Way To Handle Multiple GetView Calls From Inside An Adapter?

May 20, 2010

I have a ListView with custom ArrayAdapter. Each of the row in this ListView has an icon and some text. These icons are downloaded in background,cached and then using a callback, substituted in their respective ImageViews. The logic to get a thumbnail from cache or download is triggered every time getView() runs.

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Android :: Adapter Filtering Via GetView Still Leaves Gray Lines

Sep 23, 2010

My application uses a list of media files on the phone, i.e. images, audio and video. It also allows the user to filter the list via some checkboxes in a menu, so the user can choose to show or hide each type of files. The way I've been doing this is by putting this in the adapter's getView():

// don't show unwanted file types if (cmo.hasType(MediaType.AUDIO_FILE)){
if(!prefs.getBoolean(PREFS_SHOWAUDIO, true)){ return new ViewStub(mContext);;
} }else if(cmo.hasType(MediaType.IMAGE_FILE)){ if(!prefs.getBoolean(PREFS_SHOWIMG, true)){
return new ViewStub(mContext);;
} }else if( cmo.hasType(MediaType.VIDEO_FILE)){ if(!prefs.getBoolean(PREFS_SHOWVIDEO, true)){ return new ViewStub(mContext);; } }

Which is quite effective in the sense that the list doesn't show those elements. However, the ListView still renders a 1px grey line between each View, even if they are ViewStubs, meaning I see a thick gray line whenever a group of consecutive items are filtered away. How can I get rid of those lines? Should I create a new data array, containing only the elements that should show a view?

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Android :: Stop Reading GetView() Function Again Content Is Already Downloaded In ListView?

Jan 5, 2010

I have a ListView displaying images on every element of the ListView, It works fine... but when I start to scrolling I have realized my image is downloaded again if it is displayed in the screen of my phone device!

How could I stop reloading the images or all the content of the in ListView again?
Or how could I avoid reading the getView() function again If I have already downloaded all its content?

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Android :: GetView Always Giving Null ConvertView Parameter In Preference Class UI

Jul 2, 2010

The preference type of UI is used in many Google built-in applications for example Bluetooth , Wifi etc. And the getView of the preference is used to set the image or text to make it visible in the UI screen.

the getView for the pref type UI is defined as below in framework code : ->

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

Where the convertView is not getting recycled and every time whenever the user is scrolling the list up and down, convertVIew comes out to be null.Therefore by logic inflation of the UI also happens all the time in onCreateView().This is a kind of shortcoming in terms of memory utilization , hence in a discussion (MAKE YOUR UI FAST AND EFFICIENT) where Romain Guy has mentioned about the tricks to increase the app performance doesn't hold good for preference type of UI.

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Android :: ConverView Parameter In GetView() Of My Custom Adapter For Gallery Is Always NULL

Nov 14, 2010

I have made customAdapter (which extends BaseAdapter). I want to reuse the old views..

So I am checking:

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

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Android : Way To Maintain Orange Background Of Selected Listview Item In GetView?

Jun 28, 2009

If you derive a class from ArrayAdapter for the purpose of customizing the views of listview items, and you vary the background color of those items by doing something like this in getView()...

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Android :: Method OnBackPressed() Of Type FirstGroup Must Override Superclass Method

Sep 7, 2010

I'm trying to override the onBackPressed() method of the ActivityGroup class:

public class MyClass extends ActivityGroup {

@Override
public void onBackPressed() {
// do something
return;
}

but I'm getting the error The method onBackPressed() of type MyClass must override a superclass method. I'm relatively new to Java, I've seen here that people do it and it works for them Why I'm getting this error? I'm writing an app for android 1.5, could the problem be here?

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Android :: Show Method Definition - Eclipse Recognizes Warning On Method

Nov 22, 2010

In Eclipse, when I mouse hover over a built-in method, it displays a method definition including stuff like what the method does, input objects, return objects etc. If I have a yellow line (warning) under the method I'm trying to use, I can't get the mouse-over to show the definition. If I try hitting F3, I get a "The Jar of this class file belongs to container "Android 1.6" How do I show the definition of the method I am using when there is a warning?

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Android :: Method.getAnnotation( ) Or Method.isAnnotationPresent( ) Not Working

May 12, 2010

I am trying to use annotation - method.getAnnotation( ) or method.isAnnotationPresent( ) and it is not working. I am using eclipse emulator for 2.1 OS version with JDK 1.6. Following is information about what I did..................

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