I´m new in android development. I want to create a game where the user needs to quickly drag and drop balls with the finger in the screen to specific locations in order to win.
I don´t know if i can do this with simple ImageViews or i need to use canvas or other thing to draw in the screen.
I have tried to drag and drop an ImageView on top of another ImageView but it does not seem to work very well and i'm hesitating if i need to do it drawing figures instead of using the ImageViews or to do something else.
Please advice. Any help is apreciated. Thank you.
ImageViews are Views designed to hold image drawables, which isn't really needed in your case - you can use a simple View with a color background or implemended onDraw method, you can use an ImageView just as well.
Asfor the drag and drop, what you need is any View with implemented onTouch method so that the view changes its position on screen with ACTION_MOVE touch events.
If you're interested, i have implemented a simple frame layout with drag and drop functionality. My layout requires long-click to start drag, but it can be easily modified so it won't. Check it out at my github page. You can clone the project and run demo activity to see how it works, and start from there.
Related
I have two gridviews and move images between them on a touch event. I would like to have some transition to show the image moving from one view to the other. Ideally it would appear that the images move across the screen similar to the look of a drag and drop. But instead of the user dragging, I would like the image to move from one view to another on a touch event. But any transition that communicates the idea that the image has moved from one list will do.
I've looked at Scene transitions but the doc says "The framework does not support animating changes to ListView objects, so you should not try to animate them during a transition."
Any sample code from anyone that has done something similar would be appreciated or some guidance to the best approach.
I am working on a simple app, which will allow moving one ImageView & dropping it on another ImageView. I am having problems with how onTouch works. It seems that it always takes rectangular input.
Let's say I have a shape like that:
Link
All small dots represent places which will trigger onTouch. But only green ones should... So in other words, I do not want Drag to be triggered when I am touching transparent part of the image.
Is this possible?
BR,
Kuba
If anyone will stumble upon this question, here is an answer: You must extend the DragShadowBuilder class to achieve that. More details in below question:
Set custom anchor when dragging a View
I wan't to develop game named "Balda".
I have a 2d grid of imageviews (or buttons, maybe).
User should be able move his finger on the grid, and app should know wich images in grid was touched in this move.So, in the picture below is what I'm trying to achieve. A - is start point where user pressed on screen. B is end point where finger leaves the screen. And I need to know what images were touched (There are blue in the picture).
I know that I can do something like this. But I think that this is a wrong solution, because It contradicts the principle of giving functionality by responsibilitys.
I think that it is responsibility of the imageView to know when finger enters its borders and when it is leaving its borders.
I thought, that this would be in android API. And it has MotionEvent like EVENT_HOVER_ENTER and EVENT_HOVER_LEAVE but it's not working with finger. After finger is pressed on some View it will recieve all other MotionEvents, if I get it right.
I think that this is wrong. What can I do to get this functionality? Maybe I could create some custom listeners and custom Views, that supports them?
I think your requirement is slightly similar to custom gridview.
You can try below steps-
1)Create Custom view
2)Attach TouchListener to it.
3)Divide this view into 4*3 matrix.
4)Map your images to this 4*3 matrix
5)Write a function which gives the cell number respective toTouched Co-ordinates
6)After getting cell number;get the mapped image for that cell number
7)Put this image in arraylist
8)When user lifts his finger you will get arraylist of touched images(do whatever you want with it).
9)Remember to put this custom view in your activity
Tell me,if you have any doubt or concern
I am trying to make a game. I try to use GridView but wonder how can I drag Item onTouchEvent(). I found an example
http://www.droidnova.com/playing-with-graphics-in-android-part-ii,160.html
It is a great example. I cropped my image in 12 small image bitmap. display them on screen randomly on specific position.
By overriding the onTouchEvent() I got my requirement. Now I want to animate my image as the "swap" other image by animating. I have both images X,Y location.
I am wondring if it can by done by some Animation class.So that I should not put effort for doing it manually. I know it is not a hard job. But I Animation class can do it more smoothly.
So I have a ArrayOfImages(Bitmap) and I want to swap 2Images with animation. I am using a thread that update "Canvas" in background. Please help me.
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I more thing. How can I add Scroll view with surface holder?? Is it possible? Because I think when I try to drag my image , It my not drag and active scrollbar for this response?
Finally I am using a loop for a specific x,y to a specific x,y while updating the canvas. Although this is not a efficient way.
I wanted to add a custom ImageButton on top of my SurfaceView so it essentially scrolls with the View. The canvas scrolls and zooms with a matrix. How could I go about doing this? Thanks.
Assuming I understand the question correctly, can you not just do button.draw(canvas) in your SurfaceView.onDraw() method? You definitely want to bypass the normal layout engine (because it's terribly slow for moving things around) so you'll also have to fake up hit-detection etc.