Android :: Strategies For Using Touchscreen MotionEvent Coordinates

Mar 17, 2010

I'm writing a simple tile based game using a canvas and a 5X5 grid of tiles. To determine if a tile is clicked I look at the MotionEvent supplied by onTouch. I get the coordinates when MotionEvent.event is ACTION_UP and translate to tiles. This works great on the emulator but when I touch on a device the actual coordinates of the touch register higher than I'd expect as a end user.

I'm wondering what strategies people have used to get a closer to "expected" result. Do you use a simple Y offset? Do you average the coordinates over the life of the touch? Do you use other methods?

Android :: Strategies for using Touchscreen MotionEvent Coordinates


Android :: MotionEvent - How To Get Coordinates Of Touch/ Pointer/mouse

Sep 26, 2010

I'm trying to get coordinates of the mouse, but there seems to be no easy ways. Can't make the MotionEvent object because the constructor is private. Can anyone please tell me how to get the coordinates of the touch/ pointer/mouse? I only want the touch coordinates of ImageView, but wouldn't mind the touch coordinates anywhere on the screen.

View 2 Replies View Related

Android :: Motionevent - Multitouch Events Give Wrong Coordinates

Jan 6, 2010

I have been racking my brain to try to figure out what is going wrong here. I wanted to experiment with multi-touch, so I decided to add the controls for LunarLander to the touchscreen.

Instead of adding buttons, I defined regions on the screen that when touched, would act like the buttons on the keyboard (for example, the gas fires as long as you press the screen in the area defined for the gas button, and stops firing when you release.)

To do this, I added the onTouchEvent override to the LunarView class as follows:

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

View 2 Replies View Related

Android :: Mismatch Of Event Coordinates And View Coordinates

Jun 30, 2010

I've been trying to write a little application that recognizes custom events in Android: you hold your finger over a TextView for a certain length of time, and it changes color.I'm using the MotionEvent coordinates and checking if they are within the bounds of a particular TextView, which is within a table.I am just attaching the onTouch listener to the table within the activity.But I get weird errors: the coordinates seem to be off by one view (i.e. if I touch the view below the view above reacts); or sometimes one will react, and the other will not. Any idea what might be going on?

View 2 Replies View Related

Android :: How To Convert Screen Coordinates To 3d Coordinates?

Aug 5, 2010

i'm created an application where it consists of 3d rotating cube I want to move the cube with respect to the drag on the screen.In the on touch Listener I'm able to get the x,y coordinates but i don Know how to make those coordinates to map to 3d space.

View 3 Replies View Related

Android :: How To Implement Singleton With Strategies?

Aug 17, 2010

I'm adapting Image Downloader from Google Android blog. I want ImageDownloader to be singleton since I'll be using it in multiple places in my application. I want also to be able to manipulate Bitmaps using different Strategies (eg. produce transparent bitmaps).I want to be able to use ImageDownloader in one activity and set transparent bitmaps, and in another use the same ImageDownloader but get black&white bitmaps using different strategy object.

View 5 Replies View Related

Android :: Strategies For Large Volume Of Location Geocoding

Oct 27, 2009

I have an application that uses the Google Maps API to geocode distances between lat/long pairs as a way of displaying people near to you on your phone (currently Android, working on iPhone). The issue is that even with a test group of 40 users, we are taking upwards of 10 seconds to do our calculations and send the results back to the users. While 10 seconds sounds like a long time, it's not really an issue as far as the client app goes because it's not a real-time update of people's locations (the updates occur every few minutes). Obviously this is a problem though since we'd obviously love to ramp up to tens or even hundreds of thousands of users. I'm curious if anyone else has any experience in this arena in regards to using the Google Maps API for calculating distances between points for large volumes of data?

As an aside, we're using Rails on the server, which is where all of the location calculations are occurring. The phone(s) are merely displaying the maps and updating the server with lat/long coordinates.

View 3 Replies View Related

Motorola Droid :: Ghost Writer Touchscreen - Lost Control Of The Touchscreen

Mar 18, 2010

I wonder if ne one had an major issue with their touch screen before like I had with mine. So I decided to post this little story. Let me start off with a little background info. I got my droid november 6, 5 46am central time zone. don't ask me how but the vzw dude was letting me earlier cuz I had work. I was so happy that day leaving t mobile I did love my g1 but wen I read all about the droid I felt likt I had to leave her and move on. She did do a lot for me but time tells all and it was my time go and move on.Untill two months ago (Present time I'm talking in) I realized not everyone has the bubbly keyboard. I saw friends at my unit (I'm in the army reserves) that bought the droid a couple of months after me had flat keyboards n they were bitching bout how flat it was. I agreed with them since I was woth a g1 the keyboard was a bit flat but nothing to were its such a pain, so my friend shows me his keyboard and I looked shocked played with it was like wow and I pulled my n did a side by side side comprasion and this before I saw the bubbley keyboard thread on here. So unforunately my toucscreen starting doin its own thing like it was ghost writer and spazzing out. I had no control over it this happened monday nite and I was dreading it that I will end up replacing it. But it would not let me do nothing.I couldn't go ne where on my screen it would randomly hit different icons to the point were sum times it would call my contacts. I only had control over the physical buttons. So on Tuesday during work I fought the ghost writer to let get to setting a do a system restore. First minute of the set up was ok but right wen it finish and I was on the home screen again. I was like FUDGE I don't want to replace my rare Droid. After work I replaced it, I was real pissed I had the bubbly keyboard and (something I didn't noticed untill I got my replacement) the golden plated volume side button. I miss my precious rare droid. I was soo proud to be first non employee to have the droid in houston.

View 10 Replies View Related

Android :: MapView Doesn't Display Tiles - Debugging Strategies / What's Actual Problem?

Jul 10, 2010

There are a number of posts (both here & elsewhere) about why a MapView might not be displaying tile info (personally, I've liked http://stackoverflow.com/questions/1809507/android-hello-mapview-tutorial-map-tiles-do-not-load, but there are other good ones, too).

My question is slightly different: I'm not getting tile info to show up (on my handset or in the emulator), and I'm looking for advice on what to try in order to debug this problem. As far as I can tell I've correctly located my debug.keystore, and used the Java JDK keytool to get the signature from it, which I then plugged into the Google web page, and then plugged THAT key back into my XML file. The app runs ok, it just doesn't display any tiles.

I was hoping that if I did something wrong here I'd see an error message in, say, logcat (or an exception that Eclipse might catch) that would confirm that this is the source of the error.

So here's my question - what would y'all recommend someone try in order to figure out what the actual problem is?

View 1 Replies View Related

Android :: Does MotionEvent.getEdgeFlags() Ever Return Anything Other Than 0

Nov 14, 2009

I was expecting the getEdgeFlags() method of MotionEvent to tell me when a MotionEvent had reached the edge of something, but the value returned from getEdgeFlags() is *always* zero. Is this the expected behavior? The documentation says that the flags indicate when a touch has reached the edge of the display. I've tried this on a real device and in the emulator, and the location coordinates never quite reach the edge of the display, and getEdgeFlags() always returns 0. By "never quite reach" I mean that if dragging a finger off the left edge of the display, the smallest X I got was 2. Reaching the edge of the view doesn't seem to change the value returned either.

I suppose I could set the flags myself using setEdgeFlags() using calculations with known dimensions of the object whose edges I care about. Is that how it's supposed to be used? Is this broken for now?

View 3 Replies View Related

Android :: GetPressure Vs GetSize For MotionEvent

Sep 10, 2009

Debugging on my G1 phone, I am trying to use android.view.MotionEvent.getPressure() and MotionEvent.getSize().

For MotionEvent.getSize(), I always get 0 (the documentation says it returns a value ranging from 0 to 1;

For MotionEvent.getPressure(), it seems to me this actually reflects the real finger touch size, as opposed to "pressure"; for me, I get values range from 0 - 0.63.

Am I missing anything or is it a known bug of the SDK?

View 4 Replies View Related

Android :: Motionevent.getX And GetY

Sep 3, 2010

I have a display that is 854x480 pixels. Why is it that the MotionEvent.getX and getY methods return floats? As far as I can tell, the pixels on the display are discrete integers, there is no such thing as a half a pixel on the display.

View 1 Replies View Related

Android : Know MotionEvent Is Relative / Absolute?

Sep 11, 2009

I am implementing OnTouchListener and am receiving MotionEvent objects. Some ACTION_MOVE events reports absolute X/Y coordinates, while some reports relative coordinates.

How can I ask a MotionEvent what kind of coordinates it currently represents?

View 3 Replies View Related

Android :: Activity To Generate MotionEvent.ACTION_UP

Apr 9, 2010

I am having trouble getting my activity to generate a MotionEvent.ACTION_UP. Probably a beginner's error.

In LogCat, I'm only seeing the ACTION_MOVE event (which is an int value of 3). I also see the X/Y coordinates. No ACTION_DOWN and no ACTION_UP.

I looked everywhere for a solution. I found one question on a forum that seems to be the same as my issue, but no solution is proposed: http://groups.google.com/group/android-developers/browse_thread/thread/9a9c23e40f02c134/bf12b89561f204ad?lnk=gst&q=ACTION_UP#bf12b89561f204ad

Here's my code:

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

View 1 Replies View Related

Android :: MotionEvent - Left - Right And Click Event In My App

Jul 10, 2009

I need to have a left, right and click event in my App.

I am trying it like below:

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

View 2 Replies View Related

Android :: MotionEvent HistorySize And Multiple Pointers

Aug 22, 2010

I couldn't find a definite reference for the size of a MotionEvents history, when there are multiple pointers. The reference says that if you use a getHistorical* function, you might pass it a history position which is somewhere between [0..getHistorySize()-1]. But in a lot of examples handling multitouch if there are multiple pointers they only use history positions between [0..getHistorySize()/ getPointers()-1] (so they divide the history's size with the number of pointers). Which one is the correct way?

View 8 Replies View Related

Android :: MotionEvent: Event.getHistoricalEventTime(int Pos) Broken?

Oct 22, 2010

It seems like making any call to event.getHistoricalEventTime(int pos) when there is historical touch position data available makes my application crash. I've searched online and it seems like no one ever uses this method.

View 4 Replies View Related

Android :: Metric Of MotionEvent API GetPressure - GetSize

Oct 12, 2010

I'm working on a program which used the functions as title.

There's a problem that the tunctions above do not have their metrics on API website.

To avoid misunderstanding, here is an example about "metric" I metioned before.

Ex. size = pixel, pressure = kilogram(kg)

I have no idea about the metric at all.

View 1 Replies View Related

Android :: Properly Pass MotionEvent To A Worker Thread?

Jul 20, 2009

My app forwards MotionEvents, reported by GestureDetector.OnGestureListener, to a worker thread. Right now i am doing it by calling MotionEvent.obtain, pass the obtained copy to the worker thread, handle it and recycle it at the worker thread. Is it required to obtain and recycle a MotionEvent if it is passed to another thread? Or could it safely be skiped? If i am making things overly complicated, could you please explain me at which conditions MotionEvent.obtain is usually called?

View 2 Replies View Related

Android :: MotionEvent - Cant Find Left And Right Motion Event

Jul 1, 2010

I am developing one application in which there is an imageview...in which i want to move left or right using mouse touch...for that i found "android.view.MotionEvent" but in MotionEvent there are few events among that ACTION_CANCEL 2. ACTION_DOWN 3. ACTION_UP ......etc.

Hence there is no such event for "LEFT" and "RIGHT" action....so is there any other way to implement the "LEFT" and "RIGHT" move ?

View 1 Replies View Related

Android :: 2.1 - MotionEvent Multiple Touch Events Get Mixed Up And Influence Each Other

Sep 24, 2010

Purpose of the app:

A simple app that draws a circle for every touch recognised on the screen and follows the touch events. On a 'high pressure reading' getPressure (int pointerIndex) the colour of the circle will change and the radius will increase. Additionally the touch ID with getPointerId (int pointerIndex), x- and y-coordinates and pressure are shown next to the finger touch.

Following a code snipplet of the important part (please forgive me it is not the nicest code ;) I know)

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

The problem:

A HTC Desire running Android 2.1 is the test platform. The app works fine and tracks two finger without a problem. But it seems that the two touch points interfere with each other when they get t0o close -- it looks like they circles 'snap'to a shared x and y axle. Sometimes they even swap the input coordinates of the other touch event. Another problem is that even though getPressure (int pointerIndex) refers to an PointerID both touch event have the same pressure reading.

As this is all a bit abstract, find a video here: http://www.youtube.com/watch?v=bFxjFexrclU

My question:

Is my code just simply wrong? Does Android 2.1 not handle the touch events well enough get things mixed up?Is this a hardware problem and has nothing to do with 1) and 2)?

View 1 Replies View Related

Android :: Is Bad MotionEvent/Touch Slowdown Stuff Actually Fixed On First-gen 2.1 Updates

Apr 18, 2010

I'd really like to know what the state of that fix is as 2.1 is rolled out onto first generation (MSM7200-based) devices. As it stands, I don't see much of a problem with touch eating up CPU on the Droid and N1 but those are much faster phones so I don't think it would be quite as pronounced on them. My current 1.6 devices (G1 and Tattoo) cut my framerates in half during any touch (with the sleep hack, even). I optimized my new games so that they would run well-enough (25-40fps) on that hardware but they have very touch-centric interfaces so won't work well with that bug. I talked to a few people who run 2.0/2.1 mods on their G1s and they said the problem isn't any better. They still see the big slowdown. I tested on my 1.6 emulator vs a 2.1 emulator and there is a huge improvement. The 1.6 emulator slows down just like my G1 does and the 2.1 emulator shows only a tiny bit of slowdown, which is what I was hoping for. That's encouraging, but I have yet to see a real 2.1 MSM7200 update in the field so I don't know what to think yet.

View 10 Replies View Related

Android :: MotionEvent And KeyEvent Causing Excessive Garbage Collect (GC) Calls

Jan 3, 2010

I'm running into some issues with input events and garbage collection, or more precisely object allocation. I am creating a game and have pretty much got my head around the OpenGL environment. I've digested all the relevant material I could find regarding performance, memory allocation etc (and watched the excellent presentation by Chris Pruett - http://code.google.com/events/io/2009/sessions/WritingRealTimeGamesAn...). I've pretty much eliminated any object allocations after initial setup from my game (which is still in its infancy), but I'm still getting a bunch of GC calls, like this:...........................

View 6 Replies View Related

Android :: MotionEvent ACTION_DOWN Throwing Security Exception For INJECT_EVENT Permission

Jan 25, 2010

I have added this line in my androidManifest.xml <uses-permission android:name="android.permission.INJECT_EVENT"/>

I am trying to execute following code:

CODE:........

Both above lines are throwing exception W/System.err(762): java.lang.SecurityException: Injecting to another application requires INJECT_EVENT permission.

Do we need anything else too to get it working ?

View 4 Replies View Related

MotionEvent And Relative Layout?

Nov 24, 2011

I have a relative layout built from XML.I am capturing the onTouchEvent.When I touch the screen anywhere except over the TableLayout or ImageButton

the MotionEvent.ACTION_DOWN and MotionEvent.ACTION_MOVE

events work fine.

how to make the onTouchEvent() work on the TableLayout and ImageButton views?

The purpose of the exercise was to have a drag method working over the relative layout,no

Maybe manipulating the layout_margin values? I was contemplating a transparent canvas overlay but haven't figured that out yet.

Code snippets below

XML
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"[code]......

View 2 Replies View Related

Android : Raw GPS Coordinates?

Dec 17, 2009

Is there a way I can see my phone's raw GPS coordinates, i.e. decimal lat/long? Is it built-in, or is there "an app for that" ? I have an Eris Droid.

View 4 Replies View Related

Android :: How To Fix Android WebView Crash Due To Pending MotionEvent

Oct 1, 2010

My Android app is experiencing this crash randomly during operation, and I think it is due to a pending MotionEvent that is dispatched to a null object, but not sure.

Here is the crash output:

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

My Android app manually creates a custom WebView and adds it to the ViewGroup in the Activity.onCreate() method like this:

CODE:....

The reason for doing it this way was to be able to get to the constructor for the WebView in order to pass getApplicationContext() instead of this to the constructor, which was a workaround for a memory leak in 2.1.

The issue, I think, is that this Activity is restarted frequently. This causes the normal chain of onStop(), onDestroy(), onCreate(), etc... to happen often.

So my question is, could the crashes be due to a MotionEvent being dispatched to an instance of MyWebView that was attached to an old Activity that has been garbage collected? Such as if the user clicked something in a webview right before this actvity was recycled?

Another thing to note is I'm seeing these messages following a call to onDestroy() /webviewglue( 436): nativeDestroy view: 0xd738d0

This started happening in Android OS 2.2. I've submitted a bug to Google, but not sure it is their issue.

View 1 Replies View Related

Android :: GPS Coordinates On Phone

Jul 17, 2010

Can GPS on a phone, such as iPhone or Android determine your Z coordinates? I know it certainly has to be able to determine X and Y, well longitude, latitude that is, but what about the Z coordinates? Can it determine your height, and can I obtain height relative to ground?

View 3 Replies View Related

Android :: Way To Be Able To Get Touch Coordinates In App

Jul 8, 2010

I want to know if there is a way to be able to get the touch coordinates in an app. I know of the commands getRawX(),getRawY(),getX(),getY(). But they dont give me the exact coordinates. Shouldnt these coordinates be in the screen resolution range of the phone? or do they have a different range?

View 1 Replies View Related

Android : App For Entering GPS Coordinates?

Apr 10, 2010

I have several tour guide books that list GPS coordinates for various sightseeing features.

Is there any way to enter these into Google Maps or Navigation as a destination? Is there an app that lets you do that?

View 2 Replies View Related







Copyrights 2005-15 www.BigResource.com, All rights reserved