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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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.
View 1 Replies View RelatedI 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?
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()...
View 2 Replies View RelatedI am making a time sheet program where a user inputs his in- and out-punches. I have a ListView that I am populating from an array of calendar objects. I would like each row to show the day and date then on a new line the time, but I only want to display the day and date if it is different from the previous element.Currently, I am setting visibility in the Base Adapter based on comparisons using position vs position-1 (which are used as indices to the array). This only works if the whole list fits on the screen. If it extends beyond the screen and the user scrolls around the results are unpredictable.To further confuse things, I am setting the color of the times, based on the position, to alternate between green and red (in/out) and it works as expected, scrolling or not.How does Android handle the ListView position when scrolling or what could I do differently to show/hide the day and date? Code...
View 2 Replies View RelatedI was trying to use a ListActivity which uses a custom Adapter. Every list element is a complex collection of objects which include buttons, checkboxes etc (which also have onClickListeners). Now, the problem is the onListItemClick is not even invoked when a list element is selected. I tried everything possible but am not able to get the selection. Using the trackball I am able to bring focus to the list elements, but am not able to get the call back. But, on touching, I am not even getting the focus. I tried these steps unsuccessfully to solve the problem. * Tried removing onClickListeners from the listElement Objects. * Tried making all the objects non-focussable, by modifying the XML (as suggested by Romain Guy).
View 3 Replies View RelatedScoured the docs and forums, couldn't find an answer or reason why this is happening: I have a class that extends ListActivity and a View coming from XML for each row that looks like this:
<LinearLayout ...> <TextView ... /> <TextView ... />
<CheckBox ... /> </LinearLayout>
When I click on one of the items in the list, the onListItemClick() i have in my activity is not invoked. Turns out, if I comment out the CheckBox node in my layout xml, it works. I feel like there is a simple explanation that I don't know about.. maybe because CheckBox is an actual interactive widget it's overriding some click action or something?
Say that a user clicks on a Button. Is the resulting onClick() function invoked on the main UI thread of the activity?
View 1 Replies View RelatedI'm trying to get a BroadcastReceiver invoked when the screen is turned on. In my AndroidManifest.xml I have specified:
<receiver android:name="IntentReceiver">
<intent-filter>
<action android:name="android.intent.action.SCREEN_ON">
</action>
</intent-filter>
</receiver>
However it seems the receiver is never invoked (breakpoints don't fire, log statements ignored). I've swapped out SCREEN_ON for BOOT_COMPLETED for a test, and this does get invoked. This is in a 1.6 (SDK level 4) project. A Google Code Search revealed this, I downloaded the project and synced it, converted it to work with latest tools, but it too is not able to intercept that event.
http://www.google.com/codesearch/p?hl=en#_8L9bayv7qE/trunk/phxandroid-intent-query/AndroidManifest.xml&q=android.intent.action.SCREEN_ON
Is this perhaps no longer supported? Previously I have been able to intercept this event successfully with a call to Context.registerReceiver() like so:
registerReceiver(new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// ... }
}, new IntentFilter(Intent.ACTION_SCREEN_ON));
However this was performed by a long-living Service. Following sage advice from CommonsWare I have elected to try to remove the long-living Service and use different techniques. But I still need to detect the screen off and on events.
i`ve got some problems with finish() method. I expect what after calling on my Activity finish() method onStop and onDestroy must be triggered(or am wrong??), in majority of examples they are, but Scenario: - reboot phone - launch activity - invoke finish() onPause is triggered but afterwards they are no calls to onStop() and onDestroy()I`ve noticed, that those calls are triggered after launching any other activity.
View 7 Replies View RelatedHow can I write a Broadcast Receiver that will be invoked when user clicks on any application icon?
I tried by writing:
CODE:...................
But it is not called.
I tried, by using Packagemanager I will get ApplicationInfo. From that I can know all the application starting activity name and package names. I thought I can use them to registerReceiver and my receiver will listen by its launching activity and package name.
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()).
View 1 Replies View RelatedI'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?
View 1 Replies View RelatedI'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...
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.
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 .
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...
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.
View 4 Replies View RelatedMy 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?
I would like to run the Android Camera application from my development board for about 2 hours continuously.
I want to disable the phone lock screen that comes and shuts down the app.
Is it possible to have a list activity that dosen't finish? i.e. if you scroll to the end of the list then the start of the list begins again? It's be best if you could also disable the scroll bar.
View 4 Replies View RelatedI am continuously running a thread in my activity which fetches lat/ lon information and the overlays on the map are updated dynamically through a handler. The overlays can be varying in number and can change dynamically. The thread is interrupted in onPause().
I am over riding the onTap() method in my Itemizedoverlay, where I want to call a dialog or may be start anothrer activity which describes that particular overlay item.
Every time I click on the moving overlay my app force closes.
I am basically using same onTap() method in http://developer.android.com/resources/tutorials/views/hello-mapview.... .
If it is only a Toast message and not starting a dialog/activity then it works fine.
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...
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.
I have made customAdapter (which extends BaseAdapter). I want to reuse the old views..
So I am checking:
CODE:........................
I'm trying to figure out how to continuously update the coordinates of the trackball. Right now, I just want to write the values on change to TextViews to understand how it works.
I've been looking at the onTrackballEvent. Right now, I assume that each event passed as an argument to it should be seen as a complete event, that is from the start of the trackball movement to the end. Is this correct? Because if so, the values of x and y will be the same during the execution of the onTrackballEvent body. If this would NOT be the case, I could just use a timer and update the values at a regular interval..
So either I have to somehow interrupt the onTrackballEvent call and write the values, repeatedly over and over again while it is still moving, which seems weird, or...well this is pretty much were my Google search skills and Android knowledge comes to a halt.
I am using soundpool to use sounds in my app. One of the sounds i need to play continuously in background. any example how to do this ?
soundPool.play(soundPoolMap.get(sound), streamVolume, streamVolume, 1, 0, 1f).
I'm trying to use the Media Recorder to have my application continuously record audio in memory (to a circular buffer of a known size). Indeed, I'd like to be able to play back the past 10 seconds of recorded based on a certain event in my program. Much of the Media API is designed to linearly record audio to a file. Has anyone an idea on how I could best do this with or without the default API?
View 2 Replies View RelatedI installed Google Sky Map about a week ago. It appeared to complete the installation and the app is working fine. But when I go back to the Market Downloads it is still displaying the animated 'Installing' bar. I have tried a power off reset, even removed the battery for a few seconds but when I return to Market Downloads the 'Installing' message is still there.
View 3 Replies View RelatedI'm having a conceptual problem with a simple application.
I have an empty FrameLayout and I want for a certain event to being continuously repeated until the finger leaves the display.
If I apply:
### code ###
frameLayout.setOnTouchListener(new View.OnTouchListener() { public boolean onTouch(View v, MotionEvent event) { myEvent(); return false; }});