I am using AndroidPlot and am having a problem with the chart. As my data grows, I would like the chart for older data to move beyond the screen area. Users can use scroll for viewing chart for older data. Can someone help me in achieving this?
I am not entirly clear what you mean but I think looking at the Multi-touch zoom and scroll example will probobly help.
Related
I'm using the AchartEngine libraries to make a pie chart app. But I want to display two dimensional data like this
I can get nice standard pie charts but I know how to do the second dimension. Can anyone please help? The guys on the achartengine-google-support group say it's possible but I was redirected here for tech questions.
Many Thanks
If you take a look at the Budget Pie chart demo it shows you how to highlight a section of your pie chart (https://code.google.com/p/achartengine/source/browse/trunk/achartengine/demo/org/achartengine/chartdemo/demo/chart/BudgetPieChart.java). Take a look at "Project 1" below to see how this looks.
However there is no way to change the radius like you want to in your screenshot above. If you want to achieve this the easiest way would be to extend PieChart and copy over the draw method. In the draw method where it renders highlighted sections (if (seriesRenderer.isHighlighted()) ...) use a different radius instead of translating to an offset.
I have two gridviews, they contains my custom views as their children. I have implemented a drag and drop functionality to drag a view from one grid to another. What I want to achieve now is when I drop my view on the main GameBoard grid, I want the Grid to Zoom automatically. I also want to implement Pinch zoom so that user can zoom in/out the grid by himself also. Is there any way to achieve this?
I have tried to increase the gridview column height and width dynamically, but it is not working out, please suggest me a way to do this.
Thanks.
I have dig out a lot after solving this, but I end up in a black hole. Revised entire game to remove the GridView and use basic Canvas to achieve all the functionality. Hope this helps someone.
Thanks
I'm new to android and I'm starting to develop a GPS like application for android, the basic concept of the app is to show up a blueprint, and display on top of it pins with information related to the position on the blueprint and other settings.
An example of this would be taking a blueprint of an apartment which you can scale and pan, and on top of it place markers with information about each part of the apartment and obviously positioned in the right places like bathrooms, bedrooms, kitchen, etc.
My question is what is the best approach to develop this kind of functionality?
My first thoughts were to use a RelativeLayout as a container, an ImageView for the blueprint with zoom and pan capabilities and individual views for the pinning with the respective place for information positioned based on the zoom and pan of the image.
Then I kept digging and saw the 2d Graphics option but I don't really know how to implemented for this.
I'll appreciate if anyone can send me in the right direction and if is possible some examples as well.
Thank you in advance.
Use a MapView with an ItemizedOverlay to display the markers. Here's a step-by-step answer how to accomplish this (See Item B of the answer).
This is an open question about Android ListViews, Gestures and Animations.
I'm really not familiar with the gestures in Android, so I'm just looking for ideas and grey matter on this.
Here's two screenshot and a video examples of the effect on what I'm trying to cogitate. Consider taking a look at the video, it's really worth it.
The screenshots are from an iOS open source project found here.
The question is, how would you implement a "listview opening" gesture like the one I see more and more often in iPhone/iPad apps, but for Android ?
Edit 1, idea 1:
Okay first idea, AFAIK the Pinch gesture is somehow like a dragging gesture, so I guess we can get the X and Y coordinates of the two fingers on the screen?
Next, the answer to this question may help, the basic idea is:
Get the index position of the first visible item in the list
Get the index position of the last visible item in the list
Iterate from the first index to the last with the getChildAt function
For each child, call the getLocationOnScreen method to get coordinates of the current iterated item
After that, some comparison between the pinch gesture coordinates and each item coordinates might be done inside the loop to get the two items between which the new row must me inserted.
Performances considerations appart I think it could work, but maybe there's a simpler way to get those two items(?).
Who's next? :)
Update:
Thanks for the tip #rhlnair, I take this occasion to tell everybody that I started to work on this on my spare time and you are more then welcome to help on this.
The project is at https://github.com/arnaudbos/Android-GestureListView. I started two different implementations on two different branches, and would enjoy anybody to create a new branch.
I have something really encouraging in branch "attemp-via-scale-gesture-detector" but some side effects from the ListView.
Come on folks!
seems to be a challenging idea..
i think some of the effect in clear app like dragging a selected row up/down can be taken from
https://github.com/commonsguy/cwac-touchlist
When doing a pinch gesture you have two fingers on the screen and therefore a point in the middle of those two points. That is simple euclidean arithmetic to find that middle point.
Then find as you say the element in the list that this point is above. You mention performance and I do not think this will be a problem. You are iteration a loop a few times and asking for coordinates. I have done much worse on touch events.
If the point between the pinch is above the middle of the list item you create the item above, and vice versa below.
See the section at the bottom where they use a scale listener:
http://android-developers.blogspot.com/2010/06/making-sense-of-multitouch.html
Using the scale listener you can use the scale to find out if you create a new element. If the scale is above (you are "zooming" out) a threshold you create a new element and let the view repopulate from the list adapter.
I'm at the starting point of developing an android app similar to a "mindmap" program (like Thinking Space). It shows some graph nodes (containing text, maybe images) and edges that connecting them. I can take care of graph algorithms, but I have two uncertain points about Android components for displaying these things:
The expanded graph will be pretty big, so the user need to be able to scroll both vertically and horizontally. I looked at ScrollView and HorizontalScrollView but they can't scroll both vertically and horizontally. So I hope to know which top level container I should use.
I also want the graph to be zoomable with pinch gestures, so that the user can zoom in to a small part of the graph. But I also want the graph nodes to be interactive, so the user can tap on them, typing text into them and move them with fingers. Should I implement each node as a separate View object? If so, how do I make all the nodes zoom together?
Thanks.
I would definitely rely on custom views for this kind of things, they will give you much more freedom and efficiency than using standard layouts.
Implementing a scrollable view is quite easy, and implementing the pinch gesture will be much easier if you're supporting API >= 8 (see ScaleGestureDetector). Making graph elements interactive and editable would be another thing, though.
Something really much better could be creating a custom layout, that would host editable graph elements (custom views) and draw their relations. It would be much more elegant, clean, expandable, maintainable and reusable, but it would need a lot more designing. Yet I'm sure it would be greatly rewarded.
(This would be quite an ambitious project for me, so... good luck!)