Android :: Handling Of Multitouch?
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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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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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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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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Nov 19, 2010
I'm developing an application that must handle multitouch. Basically I want single touch for rotating ( this is no problem ). And multitouch for scrolling.
I have the basic code in, but I'm having problems when the shift from single to multitouch, and vice verca, occur. Basically the movement will jolt because the median position of the multitouch ( two fingers ) and the absolute position of the single finger are at a distance. So if I have two fingers on the screen, they make up a median position, and then lift one finger, it would be like a quick movement from that median position to the absolute single finger position. This will be the movement that I don't want.
This is my code:
CODE:........
The onTouchDown function of the camera just sets the first value of the touch move. That's why I also use it in the up movement to set a new begin value for the single touch movement when coming from a multitouch.
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Mar 1, 2010
it should not zoom in too much (x < minZoomLevel etc) or zoom out too much (only one size - width or height - can get smaller than the display size)
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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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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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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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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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Jan 10, 2010
I know that there are browsers like dolphin or xscope that allow multitouch zoom, but I was wondering about something else. I actually happen to like the default browser better than those two, I really just want multitouch. I'm no developer, but I was wondering how possible it would be to take the default browser, and add nothing to it but the multitouch zoom.
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Mar 23, 2010
How we can find whether Multitouch support is available or not in various device?
I tried like this:
CODE:............
How we can use that.
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Feb 17, 2010
I'm seeing a bug with overlays on MapView with the Nexus One. Pinch and zoom multitouch gestures don't scale my overlays until the user releases the gesture, at which point the overlay redraws itself. In contrast, the My Location overlay in Google Maps WILL scale during the gesture. Is there a way to fix this in my app, or is this a MapView bug?
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Feb 6, 2010
I have a user complaining about a FC on my app and they were kind enough to post the stacktrace. It's a class that I cannot find anywhere and it sounds like it is related to multi-touch. I don't specifically call this class, MapView does so I don't have any control over it. It kind of looks like his Google API maps package is trying to use an unknown gesture library. Any ideas? I figure other devs using the MapView class might run into the same issue with their users. The user is using a Droid.
02-06 01:08:37.326: ERROR/AndroidRuntime(4231): Caused by: java.lang.reflect.InvocationTargetException 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at com.google.android.maps.MapView.<init>(MapView.java:238) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at java.lang.reflect.Constructor.constructNative(Native Method) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at java.lang.reflect.Constructor.newInstance(Constructor.java:446) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at android.view.LayoutInflater.createView(LayoutInflater.java:500) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): ... 22 more 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): Caused by: java.lang.NoClassDefFoundError: android.view.ScaleGestureDetector 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at com.google.android.maps.MapView.setup(MapView.java:368) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at com.google.android.maps.MapActivity.setupMapView(MapActivity.java:187) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at com.google.android.maps.MapView.<init>(MapView.java:280) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): at com.google.android.maps.MapView.<init>(MapView.java:255) 02-06 01:08:37.326: ERROR/AndroidRuntime(4231): ... 26 more......
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Dec 19, 2009
Is multitouch available to Android app developers? I've heard its on the new 2.0 version but only seen it accomplished on the Internet browser.
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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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Sep 16, 2009
OK I'm reading this page:
http://developer.android.com/guide/appendix/faq/commontasks.html#thre...
The code is as in the example (see below). In my application, the worker thread has done loading of large bitmaps, and I need to notify the UI thread the filename of the bitmap that was loaded as they get loaded. How can I notify the UI thread of the filename of the bitmap just loaded? I can see anyway to for updateResultsInUi() to be able to take a parameter from the example below.
public class MyActivity extends Activity {
[ . . . ]
// Need handler for callbacks to the UI thread final Handler mHandler = new Handler();
// Create runnable for posting final Runnable mUpdateResults = new Runnable() { public void run() { updateResultsInUi();
} };
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
[ . . . ]
} protected void startLongRunningOperation() {
// Fire off a thread to do some work that we shouldn't do directly in the UI thread
Thread t = new Thread() { public void run() {
mResults = doSomethingExpensive();
mHandler.post(mUpdateResults);
} };
t.start();
} private void updateResultsInUi() {
// Back in the UI thread -- update our UI elements based on the data in mResults
[ . . . ]
}
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Jul 20, 2010
I am looking for an application that can handle large PDF files smoothly. I have tried adobe reader, pdf viewer and RepliGo. They were not very impressive, therefore I have come here for suggestions. Repligo reader I think was better out of the three but I couldn't view a PDF file that had scanned images on it. Was hoping someone could recommend an app that could handle large PDFs and PDFs that contained scanned images.
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