Android :: FindViewById In A Subclassed SurfaceView Throwing RuntimeException
Oct 9, 2010
This code works fine if I move the findViewById call in to the Activity. Any hints as to why it doesn't work from inside the LearningView class? I've tried moving the TextView inside the com.example.LearningView tag but no joy. I'd prefer to get the TextView from within the SurfaceView subclass as I feel it's more logical to treat the TV as a "child" of the SV.
This is a contrived example I wrote to figure out the problem in a larger application, but the gist of it is the same, and the stack trace is basically the same.
For what it is worth, the findViewById call is returning null, which obviously threw NullPointerExceptions in some attempts to fix this.
As you can probably gather from my attempts I'm flying blind on this one.
Learning.java:
CODE:..........
main.xml:
CODE:..............
Stack trace:
CODE:......................
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Jul 16, 2010
first of all: yes, I read all the other threads on this topic. And not only those from this site... (you see, i'm a little frustrated) Most of them come with the advice to use "android:id" instead of just "id" in the xml file. I did. From others, i learned, that View.findViewById works different than Activity.findViewById. I handled that, too.
in my location_layout.xml i use
<FrameLayout .... >
<some.package.MyCustomView ... />
<LinearLayout ... >
<TextView ...
android:id="@+id/txtLat" />.................
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Aug 20, 2010
One using a Surfaceview, and the other using a custom view. According to the android SDK development guide, using a surface view is better because you can spawn a separate thread to handle graphics. Th SDK development guide claims that using a custom view with invalidate calls is only good for slower animations, less intense graphics.However, in my simple app, I can clearly see that using a custom view with calls to invalidate seems to render faster.What do you guys know/think about this?My touchEvent code is exactly the same, and my drawing code is exactly the same. The only difference is that one is all in the UI thread, and the other is using a tread to handle the drawing.
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Dec 21, 2009
I have been applying a simultaneous rotate and alpha animation to an ImageView using AnimationSet. It was working fine when I set a Bitmap as the image with Image.setImageBitmap(my_bitmap).
I then extended the Drawable class with my own drawing routine. In my custom drawable I do some porter-duff compositing on the bitmap i was using earlier. I set the image with Image.setImageDrawable( new MyCustomDrawable( my_bitmap ) Now my animation rotates but no longer performs the alpha transition!
One of the things I have tried is returning different values from getOpacity() in my Drawable. None of PixelFormat.TRANSLUCENT, PixelFormat.TRANSPARENT, PixelFormat.OPAQUE, or PixelFormat.UNKNOWN work.
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Nov 20, 2010
Why the following xml file should throw NullPointer exception? If I remove all reference to the array hrs_to_wait_values it is ok.
CODE:..............
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Aug 23, 2010
my app has widgets that have an ImageView and a TextView. On the onUpdate() method of the WidgetProvider, I put a Bitmap inside the ImageView this way:
CODE:..................
setColor() method is this:
CODE:..........
The problem is that sometimes the widget throws a RuntimeException because somebody has recycled the Bitmap, and I don't know what to do.
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Jul 29, 2010
Im trying to get an object form my SQLite database in my Android application. I know that the contact is in the database because when I add it and try finding by ID, it returns the object. When I try finding by first and last name, though, it throws an exception and Im left with a null reference.
Here is the query:
CODE:..........
Ive also tried to find just by first name and just by last name. Same result as above.
The exception is an SQLite exception
no such column: aurelius: , while compiling: SELECT _id, last_name, first_name,
email_address, organization_name, label, label_position FROM contacts WHERE
first_name=marcus AND last_name=aurelius
And also happens when trying to select just first or last name
no such column: marcus: , while compiling: SELECT _id, last_name, first_name,
email_address, organization_name, label, label_position FROM contacts WHERE
first_name=marcus
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Sep 15, 2010
I want to simulate a KEY_UP press on my phone.. but pragmatically can someone tell me the code of a function that can do this? i found some functions searching on www.google.com but all of them are obsolete.
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May 28, 2010
I have a GestureOverlayView over the top of a TextView. The TextView has Linkify.addLinks(tv, Linkify.ALL) called on it.
If you click on an URL in the TextView the following exception is thrown Running 2.2 (apparently a pre-release version)
CODE:...............
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Sep 10, 2010
I'm trying to implement a custom MapView. Inside my MapActivity (named mainmap) I have an inner class which extends MapView:
CODE:........
I have my main.xml formatted to find the inner class like so:
CODE:................
Also, in Androidmanifest.xml, I have the appropriate <uses-library android:name="com.google.android.maps"/> entry.
When I try to run my app, I get (amongst other things) in logcat:
CODE:..............
This is caused by this entry I find in logcat:
CODE:...............
If I understand correctly, my app is crashing because Android is saying it doesn't find the appropriate constructor for my custom MapView (the Lmapview class). As you can see above, however, it is defined and it matches the signature it is looking for.
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Nov 15, 2010
I'm trying to add ScoreNinja, the global high score system, to my Android game, and it works fine when I load it on my phone, but when I release it into the wild, I got crash reports saying: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
Here is part of the call stack:
android.os.Handler.<init>(Handler.java:121)
android.app.Dialog.<init>(Dialog.java:99)
android.app.AlertDialog.<init>(AlertDialog.java:65)
android.app.AlertDialog.<init>(AlertDialog.java:61)....
I thought the main thread had prepare() called automatically, and if not, why would it work fine for me but not anyone else?
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Oct 2, 2010
I'm new to Android and i'm trying to inflate a layout in xml but i get a RuntimeException. I have cut out almost everything except for my activity class and the class extending SurfaceView.
what i'm doing wrong?
CODE:........................
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Jul 25, 2010
I am trying to implement my own Search using searchable, and as soon as press return after entering a query into my custom search field, I get a RuntimeException:
CODE:...............
Here is what the logCat reported:
CODE:............
(More):
CODE:..............
I have been trying to figure it out for hours. Here is my AndroidXML:
CODE:.................
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Nov 19, 2010
I've an application that you can show and close several Dialogs with:
showDialog(...)
removeDialog(...)
I play a little bit with the application and when there is no any Dialog on the screen, I press the menu button and I go to the main android screen.
After a while, I enter again into my application and sometimes, I get this RuntimeException:
CODE:...........
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Aug 22, 2009
I am getting the following logs when i am changing the wallpaper for Homescreen. Even i am recycling the bitmap is done when the wallpaper changes in OnWallpaperChanged(). Still i m getting the bellow error.
CODE:.........................
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Dec 24, 2009
What could be the reason, if I get such a strange error?
CODE:.................
I do not get a special line in my code. How can I find anything out, where the error in my code is?
And the LogCat says all the time:
CODE:............................
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Apr 30, 2009
I would like to do some tests on SlidingDrawer however i always found RuntimeException when SlidingDrawer.onMeasure is called i check the code and think the exception is caused by unspecified MeasureSpec
so i would like to ask how to setup the MeasureSpec in SlidingDrawer?
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Aug 6, 2010
I am accessing a URL that's redirecting me to a URL with spaces in it. (Using HttpClient 4.x) How do I prevent this from throwing an error (replacing the spaces with %20 not +)
CODE:..................
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Sep 12, 2009
I turned on DEBUG_CHECK_GL_ERROR for my GLSurfaceView to try to figure out why I'm having a problem on pause/ resume/reload everything, and when I turned it on, I got an UnsupportedOperationException when calling GL11.glGenBuffers() (for creating Vertex Buffer Objects).
Why is it saying that operation is unsupported when:
1) The vertex_buffer_object extension is listed on the target device and my code checks for it before trying to use VBOs.
2) VBOs are working correctly (and really well might I add).
This is on a G1. Yes, I know the G1 is only OpenGL ES 1.0 compliant and I'm trying to use a 1.1 extension, but if the phone lists the extension, doesn't that mean I can use it? Also - the extension works! Does this mean that it works but use-at-your-own-risk, kinda like how SoundPool was in Android 1.0?
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Apr 7, 2010
I'm currently working on an android app that pulls a list of forums from a JSON feed. I'm trying to parse the feed and immediately upon calling getJSONArray a JSON exception is being thrown with no stack trace. The JSON being returned is stored in an JSONObject jobj with the format as follows: However when running the following code, I get an immediate exception without a stack trace: Code...
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Apr 6, 2010
I created a TextView and put an url to it, using setText(Html.fromHtml("");. Its opening the web page in the built-in browser and when I press back, its coming back to the application.
I don't want to come back to the application, so in activity's onResume(), I call finish(). Its exiting at the first time. But when I open the application again, its throwing some exception.
Any other way to close the application, other than this way.
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Aug 27, 2010
I'm having trouble with a spiner throwing a nullPointerExpression I'm sure I'm missing something stupid? Code...
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Feb 15, 2009
I get the following error in logcat: java.lang.RuntimeException: Binary XML file line #26: You must supply a layout_height attribute. Can you please tell me which xml file that I am missing? And it said 'binary xml', does it mean it is actually line 26 in my file? or it is line 26 in the file after it compiles to be a binary xml file?..........
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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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Nov 8, 2010
I wrote an android app and so far it works perfect except for on one phone. It is the exact phone that I have with 2.2 on both phones and mine works perfect. The other phone is getting force close all the time but only when opening an activity that queries my image DB and tries to show a gallery. Every activity crashes in the same place, the viewimages. At first I thought it was the intent that was doing it but one of the activitys does not have the intent, it opens the images below the gallery. This works on the emulator, on my moto droid and on a few other different droids. Here is the code for the gallery and my bitmap decoder.
The error is below that.
CODE:..............
Here is the error
CODE:.....................
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May 24, 2010
I am creating a layout through code and want to add a View to that layout. The view which is to be added is defined in the xml file. Is there any way to use an View from xml before calling setContentView method. Because we can not call findViewById before setContentView.
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Apr 15, 2009
I have a main.xml as the main view and another alert_dialog_text_entry.xml for one dialog when a button is clicked in the main.xml view. In the click handler of the button, the findViewById () can't work, the returned vaule is null, the code is like this:
CODE:...........
The alert_dialog_text_entry.xml:
CODE:................
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Jun 24, 2009
I develop an application. This don't use activity class. only use service class..
I need method(findviewbyid). but service don't have this method.
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Nov 8, 2010
I try to customize a tab and I write this code:
CODE:.......................
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Feb 5, 2009
I create a dialog using this:
CODE:.................
Then I try to get the 'yes' button using this: Button yesButton = (Button)d.findViewById(R.string.btn_yes);
But I get null for my 'yesButton'.
Any idea why findViewById does not work? And if not, how can I get a reference to yes button of the dialog?
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