Android :: How To Redraw Only A Part Of My Custom View
Aug 14, 2009I have a custom view, that overrides the onDraw() method. For better performance I want to redraw only a small part of Canvas in onDraw().
View 4 Replies
View 4 Replies
Android : Get A Custom View To Redraw Partially?
Jun 1, 2010I have a custom view that fills my entire screen. (A piano keyboard) When a user touches the key, it causes invalidate() to be called and the whole keyboard gets redrawn to show the new state with a touched key.
Currently the view is very simple, but I plan to add a bit more nice graphics. Since the whole keyboard is dynamically rendered this would make redrawing the entire keyboard more expensive.
So I thought, let's look into partial redrawing. Now I call invalidate(Rect dirty) with the correct dirty region. I set my onDraw(Canvas canvas) method to only draw the keys in the dirty region if I do indeed want a partial redraw. This results in those keys being drawn, but the rest of the keyboard is totally black/not drawn at all.
Am I wrong in expecting that calling invalidate(Rect dirty) would "cache" the current canvas, and only "allows" drawing in the dirty region?
Is there any way I can achieve what I want? (A way to "cache" the canvas and only redraw the dirty area?"
Android :: Setup An Listener Just For A Part Of Custom View?
Jan 31, 2010I want to create a custom view (extends View) which contains an image and a text.
Is it possible to set an listener just for image if i use canvas.drawBitmap(imageBitmap, ...) method?
Android :: How Does ImageView Just Redraw Part Of Its Content When Invalidate(Rect) Is Called?
Nov 8, 2009I am new to Android development, just reading docs and trying the APIs. I am quit confused how ImageView managed to draw just a part of its content after an invalidate(Rect) invocation.
I've checked ImageView.java, found no other drawing method except onDraw(Canvas), but onDraw(Canvas) only cut the drawable only if it is beyound the view's visible boundary. I also read the implementation of View.invalidate(Rect), I think the key of this function is calling to mParent.invalidateChild(this, r);
However, I think the parent view doesn't know how to draw the child in the given Rect, it finally has to call some method of it child to paint out. Has anybody investigated this part of codes? Would you please give me some guide?
Android :: Getting View To Redraw When Parameters Change
Sep 20, 2010I want to get a set of Views to redraw after I change some drawing parameters. I'm calling invalidate() and forceLayout() on the parent of the Views but nothing happens. If I rotate the screen then the Views redraw correctly using the new parameters, as you would expect. What else do I need to do to get the Views to redraw?
View 3 Replies View RelatedAndroid :: Why Setting TextView.Ellipsize As Marquee Cause Its Sibling View In Linearlayout Redraw
Feb 3, 2010We are using TextView's Ellipsize function to scrolling text in it and there many other controls in our window. We noticed CPU would go up to 50% if text started scrolling. After digging deeper, we found all controls in our layout kept drawing when texts scrolling. We wonder why? And how to avoid all controls redrawing?
View 8 Replies View RelatedAndroid :: Draw A Particular Part Of A View?
Mar 4, 2010Let consider this is my tile view (which is a bitmap):
0 0 0 0 0 0 0 0 0
First, I have change the view to
1 0 0 0 0 0 0 0 0
Second, I would like to change the middle one, and I expect the result is 1 0 0 0 1 0 0 0 0
However, the view give the result: 0 0 0 0 1 0 0 0 0
Is there any method that I can draw the particular part but now the whole view? code...
Android :: Redrawing Part Of A Custom ListView
Aug 20, 2009I have a custom ListView and I want to redraw a View inside each row under some circumstances. How would I do that in the ListActivity?
But that seems a waste, redrawing the whole listview. Code...
Android :: How To Create List View As Part Of Form
Sep 29, 2010How to create a list view as a part of a form in android using listview as a part of the form .. something similar to select option in htmk is what i am looking for
View 1 Replies View RelatedMotorola Droid :: Custom Boot Animation - Part II
Dec 23, 2009I finished my boot animation and uploaded it to YouTube, so I thought I'd share it again. (Last time I embedded a .gif file, and it wouldn't play on the DROID.)
View 1 Replies View RelatedAndroid :: Custom View Extending View-Class / Still Based On XML-Layout
Aug 17, 2010I 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?
View 1 Replies View RelatedAndroid :: Text View Cuts Off Part Of An Initial Capital "J"
May 3, 2010I'm having a problem with TextView and would appreciate some help finding out what I might be doing wrong. (Or if this is in fact an Android problem, a workaround If the first letter of text in a TextView is capital "J", the first pixel or two are cut off so that the "J" starts looking a bit more like an "I". If I set the gravity to, say, "center", the "J" looks OK. Setting layout_marginLeft or paddingLeft to a non-zero value does not help. If you would like to see this effect for yourself, the easiest way is to create a default generic Android project and change the "hello" text to something like "JJJ".
View 5 Replies View RelatedAndroid :: How Do I Programmatically Add Gestures View To Custom View?
May 26, 2010I 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?
View 1 Replies View RelatedAndroid :: Multi Column Custom List View / With Editable Edit Text At End Of List View
Nov 3, 2010I 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).
View 1 Replies View RelatedAndroid :: SQLite For Android Custom Table View (SQL VIEW) Discrepancy?
Jul 16, 2010I'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;........
View 2 Replies View RelatedAndroid :: Style Own Styleable With A Style - Custom View Class With Custom Attribute
Jul 8, 2009I'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?
Android :: ExpandableListView Won't Redraw
Jul 29, 2009I have an expandable list view with a static array for the group data and an SQLite database for the child data. It is implemented with the BaseExpandableListAdapter and works great, except, when I edit the database to delete or add children to the list I do not see the changes onscreen. It looks like I can use the registerDataSetObserver method to notify the adapter and expandable list of a data change. What I have to do in the callback to make Android redraw the list after data changes is what I need to know. Can I do it? Documentation on this part of the SDK is a bit sparse and expandable list view example code is not a good match. Can anyone offer advice on how to use a DataSetObserver? It feels like I have to switch over to a Cursor type adapter.
View 2 Replies View RelatedAndroid :: Force A MapView To Redraw?
Mar 10, 2010I've found that after changing the overlays on a MapView, the changes aren't seen until the user moves the Map, causing a redraw. Is there a way to force this redraw?
View 1 Replies View RelatedAndroid :: SurfaceHolder.unlockCanvasAndPost() Does Not Cause Redraw
Sep 29, 2010I'm implementing a fairly standard app with the Android sdk that involves drawing using the SurfaceView, SurfaceHolder, Callback setup.
In my main thread (UI thread) I have no drawing or handling of the SurfaceHolder (or the canvas you retrieve with it).
In a separate thread I have the following:
CODE:...............
This code is being executed, throws no exceptions, and has no negative side effects that I can find; however, the unlockCanvasAndPost() call never causes onDraw() to be called.
In other words, unlockCanvasAndPost() does not cause a redraw of the SurfaceView.
Any ideas what could cause this symptom? I have plenty of java experience, a fair amount of android experience, and a lot of debugging experience and cannot track this one down.
Android :: Redraw Linearlayout After Clicking On Button?
Nov 22, 2010I have a linearlayout that is filled with texviews dynamically when i click on a button , but the content of linearlayout doesn't appear, how can i redraw it?
View 2 Replies View RelatedAndroid :: ArrayList In Custom View?
Oct 9, 2010I'm writing my own custom view, a keyboard, which I think the ArrayList in the keyboard view is causing the application to quit in the emulator.
public static ArrayList<HexButton> hexButtons = new ArrayList<HexButton>();
The application ran fine when I did
setContentView(myKeyboardView);
But I want to nest my keyboard with a TextView so I'd like to be able to do
setContentView(R.layout.main);
Android :: Using Swype On Custom View
Apr 23, 2010Trying to support Swype on application for Android. The code isn't using Android's native EditTextView but our own custom View. What API can be used to retrieve the text once a swype has been completed and what callback method we should expect in our View?
View 3 Replies View RelatedAndroid :: Custom View In Widget
Nov 19, 2010Can I use a custom view like com.examples.me.customview in the xml file of a app widget and can then draw in the onDraw of the custom view? Or do I have to draw into the drawing cache of an ImageView instead?
View 12 Replies View RelatedAndroid :: Using Custom View In Widget
Aug 2, 2010i made a extended a View, overwrote the 3 View Contructors and tried to insert it on my xml of a widget.is it possible to use custom views in Widgets?
View 1 Replies View RelatedAndroid :: Want To Create Custom View
Aug 8, 2010I want to create a custom view.In which i want to have a background image,2 buttons,1 textview.Can anybody tell me how to start with.
View 2 Replies View RelatedAndroid :: How To Add Scrollbar In Custom View?
Mar 11, 2010i have a custom view, when i want to add a scrollbar to it, i have a problem, i have learn the code of GridViewSpecial(which belong to Gallery) to my code, i found that my app can't resolve android.R.styleable, i search this question in groups, i know it was removed from SDK. so i write a styleable same as SDK in my app's attr.xml, but it wasn't work,i get a nullpointer when my view draw scrollbar.So someone can help me ?how can I add a scrollbar in my custom view ? (I don't want use ScrollView in my APP
View 2 Replies View RelatedAndroid :: Custom View Not Appearing?
May 29, 2010When I comment out setContentView(boardView); in my Game.java my custom view in BoardView works fine and displays everything nicely... but onSizeChanged never gets called in BoardView.java... so I can't read the device width and height at runtime. If I leave setContentView uncommented onSizeChanged works... but the screen is blank! I want to be able to read the screen width and height at runtime and set the sizes of my ImageViews at creation so they are the optimal size.
public class Game extends Activity implements OnClickListener{
private BoardView boardView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {....................
Android :: Custom View Not Appearing
Aug 2, 2010Here is the XML for the layout in which I want my custom view to appear.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
android:id="@+id/widget273"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:rs="http://schemas.android.com/apk/res/com.bookcessed.booksearch"..................
Android :: Add Custom View To XML Layout
Nov 28, 2009Currently, I am creating a custom View class (DrawView) that inherits the View class and adding to my activity programatically by using RelativeLayout and LaoutParams etc. But is there an easier way to do this by adding my DrawView to the layout XML file?
View 4 Replies View RelatedAndroid :: Adding A Custom View Through XML
Apr 22, 2010I 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:................