Android :: FindViewByID Returns Null - Works Different Than Activity.findViewById

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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Android :: FindViewById Returns Null

Jul 12, 2010

I have super.xml and a subset.xml.

...............

I get a null pointer exception at price.setText(data.getStrTotalPrice()); Very strange, name.setText(data.getStrDescription()); does not give a null pointer exception.

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Android :: FindViewById Returns Null In New Intent

Jun 17, 2010

I am having a problem where in the started Intent, the findViewById returns null. Is there anything special I should know about starting a new intent? It goes something like this for me:

//in the MainList class
Intent stuffList = new Intent(this, StuffList.class);

then in the new Stuff's constructor:...............

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Android :: FindViewById(R.id.list) Returns Null

Sep 23, 2010

I have a class that is called when my app launches. public class MainActivity extends Activity implements NetworkEvent.

In this situation, list = (ListView) findViewById(R.id.list); works perfectly.

However if I then call a new intent via:

CODE:.........

where SimpleList is defined as: public class SimpleList extends ListActivity implements NetworkEvent then when I call

CODE:.........

From within the SimpleList class, list is null :(

How come? Both classes are within the same package.

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Android :: FindViewById Returns Null MapView When Following Maps Tutorial

Jun 4, 2009

I'm following this tutorial here: http://developer.android.com/guide/tutorials/views/hello-mapview.html

and am on point 11

Here's the res/layout/main.xml:

CODE:........

Here's the code:

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

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Android :: Why Return Null When Using FindViewById In Activity To Find And Handle CustomView?

Dec 4, 2009

I wrote CustomView Class, and load it in layout. so i trid to find CustomView using findViewById() in activiy to get handle. but findViewById() was return null.

Written Code is like below:

CODE:.........

MapCanvas.java:

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

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Android :: CheckBox Test - (CheckBox) FindViewById (R.id.test) - Returns Null

Mar 17, 2009

why CheckBox is always null.

<CheckBox id="@+id/checkbox" android:layout_width="wrap_content" android:layout_height="wrap_content" />
code file-
package com.reblogr.reblogrclient;
public class Test extends Activity { /** Called when the activity is first created. */
public CheckBox checkbox;
@Override public void onCreate(Bundle savedInstanceState) { ....................

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Android :: FindViewById Vs Local Reference In Activity

Jun 17, 2010

Would it be there noticeable speed improvement if I would create local references to needed view elements (e.g. EditText or Button) in my activity (in onCreate()) and use them for accessing needed elements or it does not much matter if I always use findViewById() when I need to access some particular element?

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Android :: Use FindViewById Before SetContentView

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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Android :: Can't Use The FindViewById() In An Second View

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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Android :: Findviewbyid In Service?

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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Android :: Get A View With FindViewById()

Nov 8, 2010

I try to customize a tab and I write this code:

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

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Android :: How To Use FindViewById() In A Dialog

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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Android :: FindViewById When Multiple Views Have Same ID

Aug 5, 2009

what would be the outcome of using findViewById when multiple child views have the same ID lets say for example when using a layout to dynamically produce multiples of the same control?

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Android :: Pass Control By Name To FindViewById

Aug 18, 2010

If you got:

CODE:........

where "widget28" is the name of your button, how can you pass this into the findViewById as a String? or get it from R class as a string?

I want to get the Button instance by string and not by the hard code R.id.widget28 reference.

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Android :: Find Some Performance Numbers For FindViewById

Apr 13, 2009

trying to find some performance numbers for findViewById - need to convince to change bunch of the findViewById for the same widget to member variable with just one findViewById on create . Or may be i'm wrong and it's fine ?

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Android :: Add New Id To R.id To Later Reference It Via FindViewById() In Unit Test?

Jul 9, 2010

I am creating an EditText object which i then try to reference in a unit test. what is the best way to add a new 'id' to R.id for this dynamically created object so that i can later reference it via findViewById() in the unit test?

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Android :: Eclipse Is Marking FindViewById(int) As Undefined

May 24, 2010

Eclipse is marking findViewById(int) as undefined; it was doing the same thing for getResources(), but I was able to get around that by calling context.getResources() instead (as seen below) and can't seem to find a similar workaround for findViewById.

Here is the code:

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

Is there another package I need to import for findViewById?

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Android : Droid Typed Controls Instead Of FindViewById

Dec 23, 2009

Is it somehow possible that instead of:

Button btnNextWord = (Button) this.findViewById(R.id.btnNextWord);

Eclipse automatically generates for me something like:

Button btnNextWord = this.btnNextWord;

or

Button btnNextWord = R.id.getBtnNextWord(this);?

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Android :: FindViewByID - Get View Of A TextView Through A Listener Of Another UI Element?

Sep 9, 2010

This is going to be a bit lame question. I have the following code:

CODE:.....

I have a TextView in my xml layout file. I'd like to get it and change my text when I click this button.
But I can't get it (the TextView) unless I make it as a value of a static member of this class and pass it to the constructor. I believe I am missing a big point here, so i'd be very thankful if you could explain how this is meant to be done ?

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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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Android :: Fail On Trying To FindViewById For Nested TextView - Within ListView

Jul 31, 2010

Trying to have a ListView (scrollable list) of rows made of two TextViews. I have a list of items from a database that I want to populating into the LinearLayout->ListView->TextView but can't get to the id...

Layout somewhat like this instructional link, but have backed away from RelativeLayout and using LinearLayout to get it working. Not even worried about how it looks yet; just can't get it wired together yet.

http://android-developers.blogspot.com/2009/02/android-layout-tricks-1.html

Have two XML files (very abbreviated details below)

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

I have an ArrayAdapter where I inflate the stuffView. My thinking and understanding of other examples is it's not inflated (this nested stuffView) until I purposely inflate it. That all works fine but when I do the findViewById it returns null and thus I can't setText().

epic Fail due to complete ignorance/newbieness on my part. Note: I've pored through what I can of Reto's book, especially a simliar example on Page 163 but fail fail fail...

Can some kind soul point me in the right direction?

Must I inflate this nested view? (Reto's example does). If so, what am I missing? I'm hoping someone can point me to a better example.

My code's probably too involved at this point to post and a bit proprietary.

CODE:........

A pojo called Thingy (not copying Thingy.java here - very simple)

The main class:

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

So this code is in essence what I'm looking for help on; neutered the names to call it Thingy.... This sample isn't triggering the getView(). That's a secondary problem I have to sort out. More importantly, your help on the findViewById failure and if I've got the XML right would help a bunch.

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Android :: FindViewById() - Lost In Auto-generated Errors

Nov 14, 2010

I don't consider myself a beginner, but my copy and pasting has left me lost in auto-generated errors.

Here's my dilemma, if I remove the comments below the program crashes unexpectedly; with comments it displays just fine.

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

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Android :: Change Context For FindViewById To Super From Inline Class

Mar 12, 2010

I am trying to get the value of a EditText in a dialog box. A the "*"'ed line in the following code, the safeNameEditText is null; i am assuming because the 'findVeiwById' is searching on the context of the 'AlertDialog.OnClickListener';

How can I get/change the context of that 'findViewById' call?

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

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Android :: Using FindViewById - Create Small Simple Application On Emulator?

Jan 20, 2009

I am trying to create small simple application on emulator. I want to create button and display with some click event. I am not able to use findViewById method with R.id.abc. It always gives error as R.id cannot be resolved.

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Android : Create FindViewById Parm Dynamically Or Programmatically At Runtime

Sep 27, 2010

I have an xml layout that will display a grid made up of textviews within tablerows. The textview names are cell00, cell01, etc. At runtime, my program will determine which cell needs to be changed.

Is there a way get format a name so that it can be passed to the findViewById method at runtime? For example, if cell00 is needed, how can I generate the parm in this code?

TextView currcell = (TextView) findViewById(R.id.cell00)

Something like "cell"+00 doesn't compile because the findViewById method doesn't accept a String type. I don't want have every textview name in the grid hardcoded in the program - there must be a better way.

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Android :: Custom Toast - Service Class Does Not Inherit The > FindViewById() Method

May 19, 2010

The problem seems to be that the Service class does not inherit the > findViewById() method.

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Android :: Geocoder API - Returns A Null Value

Aug 26, 2009

I am having a real hard time with the geocoder API of android sdk 1.5rc2. In my app I am trying to get the addresses corresponding to a location name by using the getFromLocationName method of the Geocoder class. But the problem is whenever I call this method it returns a null value. I have also pushed a geodb file containing some fake addresses at 'data/misc/location' directory in the phone.

The format of the data in the geodb file is as follows :

address 1 latitude "38.898763" longitude "-77.036655" line 0 "1600 Pennsylvania Ave NW" line 1 "Washington, DC 20006" locality "Washington" region "DC" postalCode "20006" countryCode "US" countryName "United States"

and following is the code snippet : Geocoder geocoder = new Geocoder(this, Locale.getDefault()); List<Address> addresses=geocoder.getFromLocationName("1600 Pennsylvania", 10);

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Android :: ANDROID_ID Returns Null On G1?

Nov 15, 2009

Following other threads - I'm trying to get a unique device ID from the device. I tried this:

String ID = Settings.Secure.getString(context.getContentResolver(), android.provider.Settings.Secure.ANDROID_ID);

but this returns null when running on my G1. Is it supposed to be returning a valid number, or am I accessing it wrong? I don't want to use the telephony device ID because that requires more permissions.