Android :: Adding Scrollbars In A Custom View
Mar 5, 2010
I am working on adding vertical and horizontal scrollbars in a custom drawn View. I have overridden the compute*ScrollOffset, compute*ScrollRange, etc methods and have enabled the scrollbars by called set*ScrollBarEnabled. However, I do not see the scrollbars in my View, even after a call to scrollBy, which according to the documentation calls awakenScrollbars (I assumed awakenScrollbars is not required as the scrollbars do not auto-fade - isScrollbarFadingEnabled returns false).
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Apr 22, 2010
I was attempting to add a custom view in XML, but I kept getting force closes. It works fine when I just find the parent and use addView() so it isn't the code. I'm pretty sure I'm just getting the constructors wrong. Does anyone have any experience with this?
Here's what I've got:
CODE:................
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Mar 10, 2010
So my layout looks basically like this:
<ScrollView>
<RelativeLayout>
<BunchOfViews/>
<ImageView android:layout_alignParentBottom="true"/>
</RelativeLayout>
</ScrollView>
I have the ScrollView so all of the layout always is visible no matter the height of the screen. The problem is that on a very high screen, I still want my imageview to be at the bottom. However, a child of a ScrollView dont seem to have a defined bottom. The View is placed at the top of the layout. How can I solve this problem in a neat way?
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Mar 20, 2010
I need to draw a child view containing a rectangle and button on top of the content view at particular location on the parent (content view). How can I do this? Did not find an explicit way to set origin of child view?
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Aug 17, 2010
I want to build my own custom view which should look like the Crysis-GUI.At first I designed a XML-based Layout and made it visible via the setContentView(int resid)-Method. Worked pretty well.But now I wan't to go a step further and draw in my Layout. So I created a new Class, let it extend View and overrode the onDraw()-Method. So far so good.But how can I still use my XML-Layout? I can't do setContentView anymore, so how could the same effect be achieved?
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May 26, 2010
I have a custom view that works fine and I'm trying to get gestures into it. The most common technique I see is to add XML, such as this (from Android docs.Can someone point out my errors, suggest a better way that will allow me to get gesture callbacks and/or suggest diagnostic approaches?
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Oct 9, 2010
Is there a possibility to add a view or derivative (button, textview, imageview etc...) to another view without having to go through layouts?
I have a class called ScreenView, it derives from View (e.g. public class ScreenView extends View).
I wanted to display text into it, labels, images etc..
On an iPhone it's trivial, simply create my objects and use addSubview method ; you can embed any UI objects into another. Most UI toolkits work that way too.
Problem with layouts is that I haven't found an easy way to properly position a subview (say a text view) in a given location of the enclosing View. I want one to contain the other...
I was hoping I had missed something in the documentation (which is far from being intuitive that's for sure) and I could do something like myView.addView(subview). But it ain't so :)
As a side question, what is the closest to iPhone's UILabel in the Android world?
A UILabel can contain a text or a graphic. Right now I've been using TextView and ImageView but they aren't anywhere as flexible when it comes to layout as a UILabel
Edit: Making my View inherit from ViewGoup instead, let me add subview..
However, I want to draw in my view. I found that when ScreenView extends ViewGroup, the onDraw function is never called then.
Something like:
CODE:..........
Would paint in yellow my view if ScreenView extends View ; but not if it extends ViewGroup.
How do you draw directly in the view then?
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Jul 31, 2010
I am trying to add a custom data field to a contact, its UID is known.
I have not yet understood what exactly I should do. I saw and tried other code , but to no success.
CODE:..........
And "mod" is always 0.
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May 24, 2010
I am trying to create a ListView and add it to a custom ViewGroup.
Here is my code:
CODE:.................
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Aug 2, 2010
I've got the following node in my XML layout:
CODE:.................
TagLayout is a class that extends ViewGroup, and basically holds a bunch of buttons with text (a custom object that act as tags, but that's neither here or there).
The problem is that when there are too many buttons, the view no longer scrolls. I can confirm that I am adding tags but I can't see anything.
If I wrap the above within a ScrollView, the layout never renders. I tried adding the attributes android:isScrollContainer and android:scrollbars, but that doesn't change anything. Is there something I'm missing here?
I should also add that TagLayout is overriding the onMeasure() event. I guess I need to implement a scrolling mechanism there...?
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Nov 17, 2010
I have a custom ViewGroup that I wrote, and have been able to use it to lay out child elements in code just fine. However, now I'd like to be able to use it for layout in XML. I would also like to be able to add some custom attributes to the XML file to better control my layout. How do I set up, both in XML and in code, a set of custom attributes? Bonus if it can be used with the built in designer in Eclipse.
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Jul 5, 2010
Is there any way to add custom fonts to handcent? I have all the 5 font packs but wanted to add my own.
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Nov 24, 2010
I have defined two views ExampleView1, ExampleView2, ExampleView3 and ExampleView4 in resources. In my Activity I have an empty ViewFlipper. Based on doing some logic I want to add either ExampleView1 and ExampleView2 to the ViewFlipper and show the view. Later I want to add based on internal logic either ExampleView3 and ExampleView4. How do I do this?
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Mar 18, 2010
I'm trying to add views dynamically to a linearlayout. I see through getChildCount() that the views are added to the layout, but even calling invalidate() on the layout doesn't give me the childs showed up.
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Nov 25, 2009
I am trying to add a view to a viewgroup but I am getting the following error when I run the application
Error: E/AndroidRuntime( 570): java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first. Code: public class ExampleApp extends ViewGroup{
private LayoutParams mLAyoutParams; AlbumArtImageView mAlbumArtThumnail;
static final String TAG = "ExampleApp";......................
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Nov 8, 2010
I am trying to find out how I can add an item (from xml drawable/workaround_item.xml) in a LinearLayout that is vertically aligned.
CODE:.........
At the beggining I was trying to use a ListView but as far I as know there is a bug using listview inside a scrollview. I was doing this because i have more components on the view that should be scrolled together with the list view. So I decided to remove the listview and implement a simple linear layout where i will be adding each element bellow other and so on.
The layout for the activity is as folow (layout/workaround.xml) and i would like to start adding the elements below the top bar.
CODE:........
Thats my java code:
CODE:......
Thats the result i am getting: http://twitpic.com/3562yu
Does android allow us to do this? If so, Hoe can I add the elements and set their values? (this layout will be dispalying results of soccer games).
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Sep 15, 2010
I was looking over this code about extending an ImageView: http://marakana.com/forums/android/examples/98.html
And i was wondering how can i add the new View to an existing xml layout file, along with some other views.
Already i did this inside my main linear layout:
CODE:..........
But the problem is that this way the onDraw method doesn't get called.
Maybe some examples where you combine CustomViews with xml layout.
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Apr 19, 2009
I want to add some views in each row of list view. When I add text view and image view in getView() of ArrayAdapter,it works. But after I add other kind of views (like Check Box and Image Button...), I can't select the list row touching down screen directly, I only can select by key down, up and ok.
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Sep 22, 2010
In the official Twitter Android app, the opening activity (the dashboard) and the Tweets tab activity have a live background/wallpaper (clouds moving, etc).How do you accomplish that?Is it as simple as setting your view's background to a live wallpaper drawable?And then adding
<uses-feature android:name="android.software.live_wallpaper" /> to your manifest?
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Aug 18, 2010
I have a custom view (an extension of a TextView) that I want to dynamically add to my Layout (don't want to include it in the main.xml file).
The book says to fetch the RelativeLayout using findViewById() in my java code then create a new instance of my custom view, then use addView on the RelativeLayout to add the new view.
I'm not getting any errors, but when I click my button to add the new view, nothing is happening (view isn't being added). Do I need to set additional properties on my custom view (layout width, layout height for example) in order for it to be shown?
Adding code
CODE:............
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Jul 30, 2010
I was informed in a later answer that I have to add the GestureOverlayView I create in code to my view hierarchy, and I am not 100% how to do that. Below is the original question for completeness.
I want my game to be able to recognize gestures. I have this nice SurfaceView class that I do an onDraw to draw my sprites, and I have a thread thats running it to call the onDraw etc .
This all works great.
I am trying to add the GestureOverlayView to this and it just isn't working. Finally hacked to where it doesn't crash but this is what i have
CODE:..........
The onGesturePerformed is never called. Their example has the GestureOverlay in the xml, I am not using that, my activity is simple:
CODE:................
So I am at a bit of a loss of the missing piece of information here, it doesn't call the onGesturePerformed and the nice pretty yellow "you are drawing a gesture" never shows up.
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Aug 19, 2010
I have a widget that displays a set of information. What I would like to do is to give the user the opportunity to choose the background color/image. I would like to have a popup when the user is selecting the widget to choose the background. So how would I make the popup? And how would I apply the background dynamically?
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Apr 21, 2010
i have problem to get event of list view field when i am adding checkbox in listview. my problem is to get the status of check box form every row of the list view, either it is check or not, according to that i have to do operation.
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Jun 5, 2010
I'm very new to Android programming, so this is probably something pretty basic. I just have an xml layout with a few buttons. I'm trying to follow the model given by the JetBoy demo, so I'm adding a view to the layout which extends SurfaceView. When this new view is put in my xml layout, I just get a blank screen.
Here's the XML layout if it helps. The gameview element is what causes the screen to be blank
CODE:......................
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Nov 3, 2010
I am on Android 2.1 and I have one multi column Custom listview Using BaseAdapter with an editable edittext at the end of the listview. If the data in the listview do not contain the data of user choice then user should be able to enter data. If the data is already there in the list user will be able to select the data using custom selector. If a selection is made in the list view and user wanted to enter data in the text field at the bottom after selection then the marker in the list view should be unselected. I tried to use onclick() method on edit text using click listener. First time when it is clicked, edit text is getting focus and onclick() method is not fired. And when it is clicked second time, onclick() method is fired and notifyDataSetChanged() method is called. I tried to call the notifyDataSetChanged() method from the Focus Listener, list view selection is gone in my first attempt and edit text is not receiving any data input from the keyboard (frozen).
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May 11, 2013
is there any method to add widget into custom roms.I want to add HTC clock and calendar widget into cyanogen mod 10.1 rom for huawei ascend p1.
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Jul 16, 2010
I've created a custom view in an SQLite database for an Android application. I'm using Sqliteman on Ubuntu to test my SQL statements before I put them in my app. I'm trying to do a simple select statement on my view. The select statement works fine in SQLiteman but when I put the same statement in my code it throws an error. The statement: select * from item_view where parent_item_id = 0;........
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Mar 27, 2009
My app uses a TabHost containing one tab with a ListView and another tab with a simple form. When the keyboard is slid out in order to write into the form fields, I don't get automagic scroll bars added to the LinearLayout around my form elements.
The resource xml follows.
CODE:................
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Jul 8, 2009
I'm creating my own View class, and defining custom xml attributes with a attrs.xml. As long as I provide each attribute manually, there is no problem, but
code:...................
The android:text is properly set in my instance, but the borderDrawable is not. I guess this has something to do with namespaces, because inside the styles.xml, the name="mypack:borderDrawable" is not handled by the XML parser's namespace facility, because its inside an attribute value. So "mypack" is in no way connected to "http://some.weird.url.com/seems/not/to/ matter" and adding it via xmlns:mypack... to the stylefile would not help, I guess. In the same file, "android:text" is somehow recognized, even though "android" is AFAIK only a ns-defintion for [url], which is also not declared in that file.
So what is the proper way to set a custom attribute in a style?
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Jul 6, 2010
I know this exists, but I'm not quite understanding what step two means when it says mount my system partition. Any help would be greatly appreciated.droidsp0t - The Incredible Resource Want Facebook Sync back on your custom ROMs?
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