Android :: SurfaceView Transparent Through Its Parent
Feb 11, 2009
I have a SurfaceView that is covering a portion of its parent, a RelativeLayout. I have a background image covering the full RelativeLayout area, and this is my Activity's main layout.
I would like to have the SurfaceView be transparent so that I can see through to the background image on its parent RelativeLayout. I have tried the approach shown in the API Demos example TranslucentGLSurfaceViewActivity, but this succeeds in making the transparency go all the way through my Activity to my desktop!
I'm using the "style/Theme.Translucent" theme on my activity, and setting this on my SurfaceView: mySurfaceView.getHolder().setFormat(PixelFormat.RGBA_8888);
The transparency to the desktop it kinda cool, but not what I'm trying to do! Is it possible to make a SurfaceView transparent only through to its parent?
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Jun 17, 2009
I believe I have found a graphics bug introduced in the 1.5 platform. I'm looking for some confirmation (or a description of what I'm doing wrong) before reporting it as a real bug.
I have a SurfaceView that fills the screen and on top of that I have a LinearLayout that wraps some other components that overlay the surface. These other components are not visible most of the time, and the LinearLayout has a transparent background so that the SurfaceView is unobstructed until the other components are made visible. Under 1.0 and 1.1 this all worked with a background of #00000000 for the LinearLayout. Now under 1.5 there is a black rectangle obstructing my surface unless I give the LinearLayout background some color. I can still keep the transparency so it is still invisible as it should be but it is strange that it can't be black and invisible anymore. My layout is below. The background of #00000001 works, but changing it to #00000000 results in a black rectangle. code...
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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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Aug 19, 2009
seems pretty straightforward.
CODE:..............
But doesn't work!
It scrunches the layout background as the background to each button, I want it to span all three buttons...
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Jul 9, 2010
I have already found how can I do an ImageButton with Transparent background, but I would like to ask, how can I set the effective of it ?
How can I do it more transparent ?
My way as I do it: <gradient android:startColor="#aaffffff" android:endColor="#aaffffff" ...>
What should I write in to the color to be more transparent ?
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Mar 25, 2009
Im creating a simple game using a SurfaceView for drawing the Graphics. It works fine, but now I tried to add a title screen, which is (for now) only a LinearLayout and a Start-button, specified in XML. However, when I click this button and try to switch to my SurfaceView (By doing setContentView(R.layout.game), the screen turns black. But if I do setContentView(R.layout.game) immediatly in my Activity.onCreate it works. But not if I start with my Title-screen and then try to switch
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Apr 30, 2009
I am finally testing my application on a G1 and even though it works fine on the emulator, it crashes on the G1
It crashes when it does:
CODE:.........
And the view is defined like this:
CODE:..............
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Jun 16, 2009
I want to play 2 videos one after one minimizing delay between each video. so I created 2 mediaplayer, one playing the current video and the other preparing to play the following video.
The 1st video is played correctely but I couldn't get the video track of the second video. only sound without any error.
This is my source code : (note that here, I am using files on sdcard but the application will use files on a web server. that's why I need to prepare the second video while the 1st is playing)
CODE:...................................
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Sep 4, 2010
My app fc when activity that's using SurfaceView as content view calls startActivityForResult(...) and activity that has been started calls finish()
This does not happen if I change content view to something else than SurfaceView.
This would be the requested logcat:
CODE:..................
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Dec 16, 2009
Look at this: http://nhenze.net/?p=172
They show that it is possible to put an GLSurfaceview on top on a SurfaceView. I hope it would be useful.
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Sep 7, 2010
I want to determine the available height and width of the parent layout to which I have to add my view.I have used many methods on layout like
layout.getHeight()
layout.getRootView().getHeight()
All these methods return 0(zero) as the result.My main requirement is to be able to give width to a view that is some % of the width of the layout.Also I dont want to use tag for this. I want to do it through code.
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Feb 9, 2010
I have the following l relative layout, which I want an Image to the left and an Image to the right, then the rest is filled by TextView. But I can't get the last image to align right of the parent. I have added 'android:layout_alignParentRight="true"' but it does not work. code...
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Nov 21, 2010
I am writing Java code to create a tabs.i have done that.but now i want the tab widget to be in the lower part of the screen.i hope this will be achieved by adding this code. android:layout_alignParentBottom="true" let me know how to add this coding.....
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Sep 7, 2010
As we know, startActivityForResult() used to get a result for a task from parent activity. Here when we click the setResult(). It returns the result to the parent Activity.
Child Activity means it should maintain the persistent state. That is when the users clicks a button on the child activity. It do not finishes that activity and show the Parent Activity. And again i may go to the child activity from parent activity. If the child does not exists it starts a new child activity else it should show the existing child activity with persistent content.
Simply said, my parent Activity starts a new Child Activity. Now both Activities should be alive. How to call the Parent Activity without finishing the child Activity(in other words, How to BringtoFront the parent Activity)? For this scenario,
you can not use startActivity(). Because it creates a new Activity Instance. Not Existing Parent Activity
you can not use startActivityForResult(). Because it finishes the child Activity Instance.
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Nov 5, 2010
Is it possible for the child of an ExpandableListView also be a parent?
For example, I need something like the following: ParentA ChildA ChildB ParentB ChildC GrandchildA? GrandchildB? ParentC
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Sep 16, 2010
I'm trying to customize the parent(or header) for an expandablelist and I haven't found a solution yet. I want an imageview and two textviews in the parent. This is driving me insane atm.
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Aug 19, 2009
Is there a way to specify layout_height as a percentage of it's parent?
for example, I want an interview LinearLayout view group to only be 70% of it's parent.
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Jul 15, 2010
I have a simple ExpandalbeList. For the group header view, I'm using a simple TextView, I am setting the background of the text to a drawable. I have the textview parameters set to FILL_PARENT, but the background of the TextView only covers the width of the text. I realize that I can put this all inside of a Linear Layout, but that just seems like a waste. isn't there a way to make the bounds of the text view stretch to the edge of the listview?
CODE:..........................
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May 18, 2010
When exiting the activity in a thread in a SurfaceView. This log appears in this situation:.............
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Sep 11, 2010
For years now I've maintained a Tandy Color Computer Emulator applet on my home page. With the purchase of an Incredible I decided to do a port. Getting it going in Android didn't take long but I'm really surprised how slow it runs. You can literally see the pixels painting. I know there are other successful Android emulators so I must be doing something wrong.
My approach was to use a SurfaceView for rendering. There's a separate thread that runs a virtual 6809 CPU. Whenever that thread updates the emulated video memory, it calls SurfaceHolder.lockCanvas() with a Rect describing the part of the screen requiring a repaint. Then it calls the gfx routines with the resulting Canvas...this is where I did a repaint() in AWT/Swing. The gfx routines are smart enough to just render what's in the clipRect. Perhaps I'm still stuck in AWT but I can't think of any way to make this thing run at an acceptable speed. I tried to coalesce the gfx calls but that didn't work either. Any thoughts?
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Apr 24, 2009
I am stuck.My main activity creates and starts a SurfaceView.My app needs to access a listview via the options menu to change properties of the items shown in the view.Two strange things occur:
1.) When I scroll the listview quickly, the list sometimes gets farklempt.Words overlap each other.
2.) When I select the item and the app returns to the main activity, the thread is no longer alive.
If someone out there can offer help I will post the code.This will take a little effort.My code is loosely based upon LunarLander and the GLSurfaceView examples.If there is a good example (more recent example) someone can point me to, that would be boss.
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Mar 23, 2009
I'm currently getting to grips with Android, playing around with the Lunar Lander sample. I've found that if you navigate away from the app (eg, hit the call button) it will destroy the underlying surface (calling surfaceDestroyed). Navigating back (which will trigger onWindowVisibilityChanged) the app will crash, as it will try to draw to the surface without recreating it. Is there some code I can put in onWindowVisibilityChanged (or anywhere else) that will regenerate the SurfaceView's underlying surface and resume execution nicely? It feels like this should be a simple function call but I can't find anything in the API docs.
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Jun 10, 2009
I am creating a custom Widget which extends SurfaceView and I am planning to use it for camera preview.In the main activity I tried to implement some event listeners but can't catch any event.If I press a button the LogCat outputs "Continuing to wait for key to be dispatched" line.Does anyone know how to implement event listeners in main activity using SurfaceView classes?
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May 31, 2009
I had it working with a normal View but that is to slow. I was told to use SurfaceView but can't figure out how to use OnKey with it and if I should use onDraw or draw? And how do I pass stuff to draw? does it happen automatically? code...
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Jul 6, 2010
I'm trying to develop a little game, with 2D Graphics. I want my "gaming board" to be at a specific position on my screen, so that I can display in-game informations above and below the box. But since there is beginning to be a lot of Android phones out there, I was thinking about getting "dynamic" values so that I can adapt my font size to every device.
My game is not in full screen (but it could be, it's no big deal), but in a window with no title bar.
I'm using an extension of the default SurfaceView class, implementing SurfaceHolder.Callback. I tried writing the following method :
CODE:................
But the values returned are zeroes.
(even if it means changing display strategy) ?
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May 19, 2009
I am using a SurfaceView, and wish to animate Drawables. All the animation tutorials I have seen concern using an ImageView, which as I understand is not a sensible approach from within a SurfaceView. Does anyone have any suggestions for doing frame-by-frame animation within a SurfaceView? Can it be done with openGL?
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Aug 7, 2009
When is it necessary, or better to use a SurfaceView instead of a View?
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Jan 16, 2010
I am currently starting a game engine in Android, first forray onto the platform and have the basics in place however i am unsure of the best way to approach resolution independence when using SurfaceView to draw graphics.
Looking for pointers as to how to keep the game / sprites etc all looking the same independent of the screen, obviously it wouldn't be efficient to scale all the sprites every frame or store many variations for differing resolutions
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Aug 5, 2010
I have a database filled with records in the following format: . What I want my application to do is select records from an external database, and display those records on the phone screen using a SurfaceView.
Currently, I have an Activity, and a Service responsible for the record-gathering portion of the application. The Activity passes an intent to the Service, and the Service responds by returning the records that need to be displayed. The records are stored in my program as instances of the Data class, and merely have the screen-coordinates of where the element should be drawn in the View (I am just drawing a circle for every record in the DB).
For the sake of brevity, I won't include the service but I will include a skeleton of the Activity class and the Data that I wish to display.
CODE:.................
The problem that I am having pertains to the SurfaceView. I realize that many people are going to suggest that I use just a regular View, but my application involves a lot of elements, so a SurfaceView would be much more suitable for my needs. Below is a skeleton of my SurfaceView class that contains a nested class to manage the threads.
CODE:............
The problem that I'm having is that once I make the initial call to the Panel class, I'm going to be getting new records from the service, and consequently, my Info Map data-structure is going to get updated. However, my Panel class just gets stuck in a loop and never receives any new Data objects. All examples of SurfaceViews I've found have involved updating them methods within the SurfaceView class itself (e.g. touching the screen and creating a new image, etc.) Sadly, I'm stumped on this particular problem. Is there a better approach for designing my Activity/SurfaceView interaction? Is an additional View required?
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Oct 13, 2010
I have an application with a SurfaceView and a MapView. They are displayed in a single view, like so:
CODE:.........................
Note the MapView comes before the SurfaceView. Because of this, the MapView is drawn "under" the SurfaceView, and all that I see is a black background, with the things that I draw on the SurfaceView showing. If I swap the order, and put SurfaceView first in the file and MapView second, the MapView is drawn, with none of the SurfaceView showing.
According to the SurfaceView Javadoc:
The surface is Z ordered so that it is behind the window holding its SurfaceView; the SurfaceView punches a hole in its window to allow its surface to be displayed. The view hierarchy will take care of correctly compositing with the Surface any siblings of the SurfaceView that would normally appear on top of it.
To me, this means that I should be able to put the SurfaceView first in the file, and have it "punch through" the MapView and display what it has. But, as it is, they seem to be two views, and only one is visible at a time.
After thought: I tried setting the background to #00000000 so that the alpha of the background would be zero (i.e. transparent), but it doesn't have any effect.
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