Android :: Exception Occur In Tab Layout
Jun 12, 2010
I wanna add three layout in a TabActivity, but it was force closed when I ran it.
Here is the code:
import android.app.TabActivity;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TabHost;
public class Test1 extends TabActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources res = getResources();
TabHost tabHost = getTabHost();
tabHost.addTab(tabHost.newTabSpec("egcquery").setIndicator("EGCQuery").setContent(R.layout.main1));
tabHost.addTab(tabHost.newTabSpec("PatientInfo").setIndicator("PatientInfo").setContent(R.layout.main2));
tabHost.addTab(tabHost.newTabSpec("Comp_Interp").setIndicator("Comp_Interp").setContent(R.layout.main3));}
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Jul 23, 2010
I get this exception when I try to inflate
07-22 19:15:39.903: ERROR/AndroidRuntime(3810): Caused by: java.lang.ClassCastException: android.widget.RelativeLayout
I have a base class:
public class UIBase extends RelativeLayout {}
And a more specific class:
public class Countdown extends UIBase {}
Then I try to inflate and it exceptions:
UIBase newView = (UIBase) inflater.inflate(layoutId, parent, true);
Here's the XML file:
CODE:..................
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Nov 8, 2009
I'm working in with the Android SDK 2.0 / Galileo / ADT 0.9.4 (latest to date). Against Android 1.5 API layer. If I go to the layout editor and add an AutoCompleteTextView the screen immediately gives me a NullPointerException. Does anyone have a documented workaround for this problem? I can't seem to find one. This is obviously a bug in the Android SDK. (It's been filed anyway.)
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Nov 19, 2010
I'm currently developing an application for Android which needs to use a custom made Tabs. I have encountered two problems: I'm getting this exception when i want to switch from a text mode to wyswig mode in Eclipse. This is the actual xml code that gives me that error...
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Oct 12, 2010
There are a lot of Android SDK APIs where callback handlers are registered. For a concrete example, with MediaPlayer you can set an onCompletionListener callback. Will these callbacks be called from the main (UI) thread? If the answer is "it depends", then I'm looking for some general rules for what callbacks will be called from the main thread versus another thread. The SDK documentation doesn't seem to spell it out. (Maybe I missed it) It seems important to know, because if I'm guaranteed main thread callbacks, then I can skip some thread synchronization on data shared between different places in code. If I'm forced to be pessimistic out of ignorance, then I have to write extra synch block code and worry about deadlocks, data integrity, and reduced performance.
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Jun 3, 2010
I am having an interesting problem and would appreciate any advice. My app uses WebView as its primary view. Using a javascript hook, it can launch the camera so the user can take a picture. The camera is launched using: Intent i = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
When the camera starts, it makes sense to use landscape mode, so the user naturally turns the phone on its side. After the user takes a picture, control returns to my launching Activity (actually, my Acitivity gets restarted because it usually gets destroyed to free up memory for the camera on my Moto Droid). When my WebView gets recreated, I restore its state from the Bundle I saved in onSaveInstanceState().
Now everything looks ok, except the phone is still in landscape mode. However, when the user turns the phone upright bringing back into portrait mode, my WebView takes up only half of the screen. Somewhere along the way, the scale of my WebView got lost. This seems like such a minor issue, but it is driving me crazy.
Does anyone have an idea why this might be happening? What is the correct way to preserve the scale of my WebView? I am hesitant to hard code any scale factors because what looks good on my device may not be the same for another.
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Jul 14, 2010
I created a sql lite database with the following columns:
static final String dbName="demoDB";
static final String tableName="Employees";
static final String colID="EmployeeID";
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE "+tableName+" ("+colID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+
colName+" TEXT, "+colAge+" Integer);");
I want to select all the records in the database like this and display them in a gridview:SQLiteDatabase db=this.getWritableDatabase();Cursor cur= db.rawQuery("Select "+colName+", "+colAge+" from "+tableName, new String [] {});String [] from=new String []{DatabaseHelper.colName,DatabaseHelper.colAge};
int [] to=new int [] {R.id.colName,R.id.colAge};
SimpleCursorAdapter sca=new SimpleCursorAdapter(this,R.layout.gridrow,c,from,to);
GridView grid=(GridView)findViewById(R.id.grid);
grid.setAdapter(sca);but i receive the following exception:java.lang.IllegalArgumentException: column '_id' does not exist.the db table does not have a column with name '_id'so what is wrong with this code
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Apr 10, 2010
In my android app, I'm setting an alarm that I want to occur repeatedly, hence using AlarmManager.setRepeating().
I don't want to keep track of whether the alarm is set myself (sounds like a bad idea that's prone to fail at some point), and there seems to be no API support for checking whether a particular alarm is already set for a given Intent.
Hence, I am pessimistically resetting the alarm each time my app activates:
alarmManager.cancel(pendingIntent);
...
alarmManager.setRepeating(..., pendingIntent);
Question: is calling setRepeating() idempotent i.e. do I need to explicitly cancel() any prior alarm or can I safely just call setRepeating() and be done with it?
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Jan 9, 2010
After following some instructions on Diego Torres blog I am able to test my classes using the regular Eclipse JUnit test-runner, however I also want to be able to run my unit tests from within the emulated android environment. For now this should make no real difference since the classes I am working on do very basic numerical or networking tasks, but obviously anything which involves the UI or Android API specific functions can only ever be tested on the emulator.
I set up a new run configuration of type AndroidJUnitTest wich uses the ndroid.test.InstrumentationTestRunner, however whenever I fire up the test I get the following error in the console:
[2010-01-09 00:45:23 - Pal1]Uploading Pal1.apk onto device 'emulator-5556'....................
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Jul 2, 2009
I am using Android SDK 1.5. I am developing an activity with multiple content views. It will call setContentView() with different viewgroup instance for different functionality. It contains a text input dialog popped up by an option menu item. I didn't specify anything for IME in mainfest.xml & EditText attributes. I found at first, the soft keyboard for the text input dialog will overlap on the activity content view. But after several content view switch (by calling setContentView() with different ViewGroup instance), the soft keyboard will resize the activity content view. Why this inconsistent behavior happens?
...........................
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Jul 29, 2010
it's possible to hook process in Android? for example we can hook process in windows:"trap events that will occur, either in your own process or in other processes. By "hooking", you tell Windows about a function, filter function also called hook procedure, that will be called everytime an event you're interested in occurs"
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Aug 11, 2010
How i can display custom error message before foreclose or Application not responding message will happen for an application.
Or
Can i display Custom message like "Please wait....." instead of Application not responding message.
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Aug 14, 2010
While developing for Android, I am unable to open more than one main.xml file in an Eclipse editor at a time.Each time I open one, it simply replaces the editor (tab) of the first main.xml with the new one, instead of opening a new tab - even if the contents of the existing tab were unsaved.Even stranger, I can open multiple main.xml files from different projects with no problems.This only happens when they're within the same project.
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May 4, 2010
I am new in android, i am having few problem in layout alignment. I have divide the screen into three layout,as header, body and footer. I am giving the height dynamically for the three layout in java file, so i need to give 12% of height to header and footer layout, and the remaining 75% i need to assign height to body layout. For that i have made the calculation as follow
first i am getting the height and width for the screen. With the help of the screen height i am getting the 12.5% height for header and footer layout
WindowManager w = getWindowManager(); Display d = w.getDefaultDisplay(); int totalwidth_screen = d.getWidth(); int totalheight_screen = d.getHeight();..................
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Jan 23, 2009
Is it possible to build a GridView object in XML with 3 columns and 4 rows of Image buttons? It doesn't seem to have similar containment relationship like LinearLayout or RelativeLayout viewgroups.
I want to do this entirely in an xml layout file. When I put ImageButton xml tags inside a GridView xml body, The layout panel in eclipse is throwing an exception: UnsupportedOperationException:addView(View, LayoutParams) is not supported in AdapterView.
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May 6, 2010
I have an Activity which uses a layout with a LinearLayout in it. Now I want to create in runtime a subactivity which loads some other layout and add this layout as item of my LinearLatout.
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Sep 27, 2010
I have following in xml
I wanna put the second linear layout at the bottom of the screen.
I have set the property of second Relative layout to bottom but still not showing at bottom..
code:...................
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Sep 6, 2010
I have LinearLayout. Inside to that i have added one more Linearyout ( checkbox & text ).
(LinearLayout) one textView, (LinearLayout) Checkbox,textview , one textview
Now whenever clicks the checkbox, i need to dynamically display EditBox after the checkbox.
code:..........
On the click of checkbox listener i added a code like below.
code:.........
I want to the layout which was added earlier.
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Sep 3, 2009
I am using eclipse 3.5 with the ADT plugin.when I view layout xml files, i get two tabs in the view the source code view and a graphical view.the graphical view almost never works for any of my layouts.it usually shows "NullPointerException: null" at the top and nothing else. when it does work, it often does not match what i get in the simulator or device.it seems like this thing simply is not ready for prime time; although the idea is very cool.has anyone else had much success with it?
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Mar 15, 2009
I have defined the layout which you can see at the end of this message. I do not understand, why the button is not displayed. If I move the button to the top that the rendering works.
CODE:......................
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Nov 4, 2009
In android, there are different sub-directory under 'res'
* layout
* layout-finger
* layout-land-finger
Can you please explain what are the difference between these directories?
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Jul 29, 2010
I've successfully created a countdown kitchen timer activity, however my goal is to have an activity that has 3 timers on it that all work independently. I created a separate layout just for the timer itself and moved the timer code into a class and I've used layoutinflater to create the views and then added them into the linear layout for the activity. I get the layouts fine, however there's no functionality. There doesn't seem to be anything that ties the class code to the activity. How should I approach this? Can anyone point me to some working example code?
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May 4, 2010
Here's a screen shot of the layout I'm looking for: http://www.vimtips.org/media/ll.png Can this all be done with one Relative Layout?
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Nov 10, 2009
Imagine I have a toolbar implemented as a horizontal LinearLayout as follows:
[___Button1____] [___Button2___] [___Button3___] [___Button4___]
When someone clicks on Button2, I want the toolbar to change to:
[___Button1____] [___________Button2___________] [___Button3___]
The toolbar should transition from the first state to the second state through a smooth animation. I would like to use a scale animation on Button2, and while that is happening, Button3 and Button 4 should move to the right (while the animation is going on). At the end of the animation (or maybe during), I will fade Button4 out.
Question: How do I achieve an animation of the layout of the toolbar such that only one component (i.e. Button2) is being scaled while the others are not being scaled - the layout is simply updated during the animation of Button2.
I looked at LayoutAnimationController, but it does not appear to allow me to either:
1. specify different animations for the different components, OR
2. indicate that only animate one component and don't animate the others.
I can't scale the entire toolbar because that distorts Button1/3/4 which I don't want.
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Oct 15, 2010
I have the following code in my layout.xml.
code:............
In the eclipse Plugin layout creator, the EditText and button are shown properly. (see the below screenshot)
But on the device and emulator, the button is not hidden. (see the below screenshot)
why the button is getting hidden in the device?
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Jun 23, 2010
Can I embed Tab Layout into other layout?
The designed layout is like below...
I just want to have tabs in my layout but not the root. Is it possible?
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Aug 2, 2010
My layout files are growing and growing. So I came up with an idea of putting them in subdirectories. Is it possible? Simple code:
<include android:id="@+id/mLayout" layout="@layout/subdirectory/blahblah">
seem not to work.
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Aug 13, 2010
Is it possible to have another layout in my main layout?
Such that i can set my imageview in another layout.
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Sep 26, 2012
I have 5 layout folders. layout, layout-small, layout-normal, layout-medium and layout-large.
My app is heavily image based. As a result I have created the proper images. mdpi, hdpi and xhdpi. I don't think I need to worry about ldpi since screens are only getting bigger.
With this in mind and the need for me to now create a good landscape layout for all my pages, how do I go about this? Is it simple layout-land? No need for large/small/normal again right?
Considering that I've got all my hdpi and xdpi images do I even need layout-medium, layout-large and layout-normal? Because the images will be adjusting themselves based on screensize surely I can use one layout and have that work for all screens..?
It's all getting very confusing now that I'm trying to add a landscape view to my app. It doesn't do it very well at the moment so I will probably have to design a landscape friendly layout so I can understand that I would need to rebuild all my layouts for this particular use (We're talking about 100 layous here but oh well, I can manage it. )
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Jan 4, 2010
How do I go about creating the following layout in Android?
I want a "header", that is, a header that stays the same at all times. The only thing that should change is the area below the header.
Think of it as a webpage, where the content-area is where its all happening =)
+--------------------+
| H E A D E R |
+--------------------+
| |
| |
| |
| C O N T E N T |
| |
| |
| |
+--------------------+
Sure, its easy enough to create a LinearLayot, add a View on the top and then another view below that - tada! But what Im after is how you "set up" or design the project so its easy to just change whats in the Content.
What I really would like is to be able to "swipe" (see here) the area and then just "roll in" a new View/thing in the Content-area, but keep the same header.
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