I'm running into an issue and I would appreciate some guidance. I'm writing a small Android program in Android Studio that uses MediaProjection to grab a screenshot of the whole screen and then I want to pass that screenshot as a Bitmap to my System Overlay (based on the chatheads example). When the MediaProjection runs and the Imagereader creates the bitmaps, I'm passing the bitmap into a class global variable so I can pass it into my System Overlay service and display it. The problem I'm running into is if I "tab out" to a different app, my methods stop working from the MainActivity. When my app is in focus, everything works well, when a different app is focused, the system overlay contracts and expands like it should, but the screenshots are not being taken anymore. My understand is its because my app becomes "asleep" since it's not in focus. Could anyone recommend a solution? Can I momentarily awake my mainActivity so it can take a screenshot? Can I keep my activity from falling asleep on app switch? Can I bring focus to my app, take the screenshot and then switch focus to the previous app? Any other ways?
My code can be found here: https://github.com/asheron21/FacebookLikeChathead
MainActivity:https://github.com/asheron21/FacebookLikeChathead/blob/master/app/src/main/java/com/example/chatheads/MainActivity.java
Service: https://github.com/asheron21/FacebookLikeChathead/blob/master/app/src/main/java/com/example/chatheads/ChatHeadService.java
Global Variables:https://github.com/asheron21/FacebookLikeChathead/blob/master/app/src/main/java/com/example/chatheads/Globals.java
Thanks!
Related
Is it possible to make a screenshot of a phone screen beyond the Activity background?
I want to realize an Overlay button which will make a screenshots of work of other applications on phone.
The first try in this direction was performed in this discussion Taking screenshot using OverlayService Button, but the problem wasn't solved.
I am working on a camera implementation similar to what Snapchat offers.
I have created a subclass of SimpleCameraHost to customize the directories and file paths and to handle saveImage(I am cropping the image into a square before I save it to disk). I have also subclassed CameraFragment as you(Mark) have in the demo.
I need to take three pictures(Take pic...user okays it...Move onto second pic..repeat...) before I continue with the flow of the app. I am using the single shot mode. In the Oncreate() of the DemoFragment
SimpleCameraHost.Builder builder =
new SimpleCameraHost.Builder(new MyCameraHost(getActivity(), useFFC));
setHost(builder.useSingleShotMode(true).build());
Question : I need to know how to prevent the cameraview from restarting
the camera every time I pause the app while I'm on the 'okay the pic page'
and resume.Also if I leave the app idle on this page for a while, it seems to freeze and my camera cannot be started again(from any camera app including the default...I have to restart the device). I reckon this happens because I have not released the camera. Could you please direct me as to how I should handle pausing and resuming the app.
I need to know how to prevent the cameraview from restarting the camera every time I pause the app while I'm on the 'okay the pic page' and resume
In the demo app, if I switch to single-shot mode, take a landscape picture using the rear-facing camera, press HOME from the photo-preview screen, return to the app from the recent-tasks list, and press BACK, everything behaves fine, at least on the Nexus 4 that I just tried it on.
Hence, I would suggest that you compare your app to the demo app and see where things differ that might cause this behavior.
If you feel that there is a bug in the library, feel free to file an issue, but you would need to give me a complete set of materials to be able to reproduce the problem. That would include details of the device (e.g., Build.PRODUCT), the code to reproduce it (if it is not one of the demo apps), and the steps I should manually follow to reproduce it.
Also if I leave the app idle on this page for a while, it seems to freeze and my camera cannot be started again(from any camera app including the default...I have to restart the device)
Once again, I cannot reproduce this behavior. Immediately following the steps that I outlined above, I took another picture in single-shot mode, and left the app on the photo-preview screen while I composed the first part of this answer. I just pressed BACK, and everything is normal. So, again:
Compare your app to the demo app, to see if you can determine what you may be doing that might cause this effect
File an issue if you think that it is a bug in the library, but only do so if you can give me steps to reproduce the bug
I have doing a basic object detection on the camera preview screen in Android (greater than 3.2). For the devices which do not support processing on preview screen, I am buffering the preview screen, processing it and clearing the buffer. This part is working as desired.
What I now want is this app to run in the background while any other app is running in the foreground. I am using android service and am able to run a small test app in the background. However my concern is with the camera preview app.
I don't want to display the preview screen but use the preview screen information for processing. This might be too much to ask, but I wanted to know if this is even possible. I came across this link which shows some hope. Basically I want to process the video (preview) stream without displaying it on the screen. If this is doable, then I can think of putting this app in the background and some other app in the foreground.
Unfortunately I won't be able to share the code, however it is the standard logic of creating a surface view and starting the preview.
I would really appreciate any insight into this.
Check comments here.Basically he opens camera hardware, set preview callback and do startpreview without setting the previewDisplay (this might not work on every device). You can try this from your background service. All this will work if your foreground doesn't access the camera app. Please update this if it works. I am interested to know.
I am developing an application to take images from background application say using android service. i don't want any user interaction to takes images, it should completely work from background.
I have already tried -
Calling camera from service - It not always works sometime works if we have dummy surfaceview, again if Android close the related activity service stopped takings pics, I don't want to run activity for user interaction.
with some changes it working fine but all images are black.
Widget: Not getting how to call camera in widget as widget doesn't support surfaceview.
Live wallpaper: not able to make it work till now, does it supports for camera?
As per my experience till now Android camera service not designed to takes picture if no real preview available.
Is anyone developed something like this? any help will be really appreciate.
If you can ignore older versions, it may be easier to use SurfaceTexture (API 11 and higher) As vikky.rk notes in an answer to a recent question, an introduction to this technique can be found in the PanoramaActivity code of the default Android Camera App.
As Android live wallpapers are becoming more prevalent, and developers are doing more with them, a question coming up more and more is how to hide the home screen icons temporarily while the user interacts with the wallpaper.
For this to work, the icons would have to be removed temporarily – not just made invisible, since a tap on an invisible icon would still run the app.
Also, it would be ideal to have a universal solution that works across customs launchers, not just the Android stock launcher.
This question was already asked on StackOverflow, and the answer was that you cannot do this. But this is clearly not correct, as there are at least two programs on Android Market that do exactly this: Show Off (Your Live Wallpaper) and The Cleaner (Show Wallpaper)
Is there a way to hide Android home screen icons, and then later put them back in place?
You can launch an activty which backgroung will be your live walpaper, and finish the activty upon touch... Just a thought...
Edit:
1st comment answer:
Preventing the delay:
You should be more "gentle" in the onCreate() method...
Try creating the minimum as possible in the onCreate(), like, just displaying the basic background...
in the end of the onCreate function, set an alarm (i.e. by AlarmManager) to call some BroadcastReceiver/Activity after half a second or so (with AlarmManager) to set the rest of the live wallpaper graphics... that way you don't have to worry about the delay.
This would have to be a completely new launcher. This is not possible without this I don't think. Sorry. However; to be absolutely sure though you'd have to look at the Launcher2 package in the android source and look through files like Homescreen.java. I'll look into it later on 2.3.3 for you and see what I find.
Try using the zoom gesture as you would to zoom in on a web page (reverse pinch). And you guessed it, the opposite makes everything come back.