CODEWITHSUNDEEP
androidgraphscrollsurfaceview
user650309
user650309

Reputation: 2899

SurfaceView horizontal scrolling

I'm writing an application which will create a graph and draw it on a SurfaceView. Eventually the graph needs to be able to update live but for now I want the SurfaceView to be scrollable horizontally so that the user can see all the data. Is this possible?

Upvotes: 1

Views: 3047

Answers (2)

Lumis
Lumis

Reputation: 21629

You need to place your custom view inside a horizontal scroll view as a separeate class. When you create an instace of your custom graph view you tell it to size itself according to the width of the graph by overriding the onMeasure method:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {     
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);      

    this.setMeasuredDimension(graphWidth, graphHeight);
}

graphWidth = barLenghtInPixels * barCount + extraSpaceInPixels;

You can place your customView in an xml layout using a custom tag like <com.myApplication.GraphView...> or use myScrollView.addView(myCustomView) and add it into the HorizontalScrollView, before you call setContentView(myLayout).

Upvotes: 2

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Reputation: 5759

Place a HorizontalScrollView element inside surface view. Look at gatherTransparentRegion(Region region) in the HorizontalScrollView documentation

Upvotes: 1

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