Android Question Live update direction arrow

MotoMusher · Sep 19, 2015

Looking for best practices here. I have a GPS application. I would like to add a direction arrow based off of heading to target.

What would be the most efficient method to do this? My first thought is an imageview updated every second in a timer based on a case statement of 36 images, each handling 10 degrees.

Would there be a more efficient way to do this?

eurojam · Sep 19, 2015

I would take a panel, then draw a needle (bitmap) or something on it and use an Animation to rotate it ...here are some fragments, which I used in a similar App:

B4X:

bmpNeedle.Initialize(File.DirAssets, "needle.png")
panNeedle.Initialize("")
panNeedle.setBackgroundimage(bmpNeedle)
...
Rotation.InitializeRotateCenter("Animation", 0, 0, panNeedle) 'Initialize the Animation
Rotation.Duration = 20000

'and later in the change direction event or in the timer:
'where t is the angle 
        Rotation.InitializeRotateCenter("Animation", t, t, panNeedle)
        Rotation.Duration = 20000   
         Rotation.Start(panNeedle)

MotoMusher · Sep 20, 2015

That's the perfect solution, and works very well. Thank you. I had not worked with Animation previously.

MaFu · Sep 27, 2015

For such simple graphics i place an ImageView und draw the arrow with ABExtDrawing lib.
As in my current project (see arrow on right top of the map).

The round buttons on the left top and right bottom are also drawn and no bitmaps.

MotoMusher · Sep 27, 2015

That is a good solution as well. Thanks!

Android Question Live update direction arrow

MotoMusher

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eurojam

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MotoMusher

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MaFu

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MotoMusher

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