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.

Android :: How to fix Android WebView crash due to pending MotionEvent


Android :: Crash At Drawing WebView Into Canvas / Solve This?

Sep 10, 2009

I am facing a problem. I launched a webview with some url. After url is completely loaded I try to get its content in a Canvas. But I am unable to do so. its crashing at libsgl.so

My goal is to get webview complete data in a bitmap. There is one api getDrawingCache() which gets the webview data in a bitmap format, but it gets only the visible content. I actually want the whole content in a bitmap.

If there is some another way, then how can I go about that.

Here is mine code....

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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?

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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?

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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.

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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?

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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:..........................

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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?

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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:...........................

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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?

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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.

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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.

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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?

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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 ?

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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.

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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)?

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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:.....................

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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.

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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:...........................

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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 ?

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Android :: What Is Pending Intent?

Feb 17, 2010

Please clarify me What is Pending Intent with an example.

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Android :: What Pending Intent Is?

May 11, 2010

I am newbie to Android. I read the Android documents. Can anyone tell me what "Pending Intent" is?

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Android :: Need Widget / Pending Intents

Apr 26, 2010

I've asked here a question about Task Killers and widgets stop working (SO Question) but now, I have reports of user that they don't use any Task Killer and the widgets didn't work after a while. I have a Nexus One and I don't have this problem.I don't know if this is a problem of memory or something. Based on the API: So, I don't know why widget stop working, if Android doesn't kill the Pending Intent by itself, what's the problem? Code...

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Android :: Pending Intents In Notifications

May 13, 2010

I would like to show a notification that displays the progress of an ongoing operation. That works well for me. But at the same time the remote view should contain cancel button to stop the ongoing operation. The usual content intent should still do something else, i.e. not cancel the ongoing operation. It seems though that I can only have one intent. Code...

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Android :: Cancelling Pending Toasts

Aug 13, 2009

I'm writing an application that demonstrates various gesture algorithms, and Toast after each one is detected. of course if the user goes all hogwild then the Toasts back up. can i flush the Toast queue somehow?

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Android :: Pending Intent ReceiverPermission

Oct 29, 2009

I've started using an AlarmManager for some tasks i'm doing and while setting up the pendingIntent to be broadcast I noticed there is no receiverPermission option. Can anyone tell me is it possible to set the receiver permission on a pendingIntent?

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Android :: Exception On Pending Intent

Aug 18, 2010

That message can occurr if the receiving code crashes or takes too long. I am writing an appwidget for my application, there are like multiple pending intents are there to launch an activity or receive a broadcast. The Problem I am facing is , some times I get exception saying that the Pending Intents cannot be delivered. And the widget does not responds to the touch from the user. please help me. I am not able to find any alternative also.

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Jun 9, 2010

I have a alarm thing going on in my app and it launches a notification that then when pressed launched an activity.The problem is that when I create more than one alarm then the activity launched from the notification gets the same extras as the first one. I think the problem is either with the intent i put in the pending intent or in the pending intent itself. I think I might need to put a flag on one of these but I dont know which one.The "details" extra is the same to every the next time a notification happens instead of having the different value.Until I set the intents I am sure that the correct value goes to the "details" so its a problem of getting the first intent everytime i press any notification. How can I make it to launch the correct intents?

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Android :: Way To Access Pending Notification

Sep 30, 2009

Is there a way to access pending notification or the previous notification that my application created?When I use Notification manager and use its setLatestEventInfo() method the last notification (with same intent) is updated. This is exactly what I want but when I update the notification, I want to access the existing notification's intent and get the key/value paris (Extras) and use that information to update the notification. For example in an SMS notification, I want to to get the current message (key/value pair or message itself) and update that with the new value. ( For giving the number of notifications, I can use the Notification.number, but that I want to access more values). One workaround that I am thinking is to put the data of first notification in database or in preference and access it when the second notification comes. But this is not exactly what I want, it is easier to use the existing notification instead of storing in database or preferences. Related Question: What do you suggest I use, Database or Preferences? Is there a best practise in terms of performance and elegance?

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Android :: Passing Data With Pending Intent

Jun 28, 2010

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