Android touch listener drag


Touch and Drag in Android

Android  Android touch listener drag

It’s my pet project to understand the Android platform and start writing applications in Scala onto it. After I obtain the legal aspects of my employment regarding code I produce outdoors of labor I would even have the ability to start delivering code/Android applications/make a websiteOrand so on. For the time being, I am not ready yet to create helpful applications. Hell, I am still exercising the kinks with touch occasions. To that particular finish I have been experimenting with creating a much limited clone from the Alchemy game.

If you have never performed it or seen it, the hyperlink ought to provide enough detail to obtain a concept. From the developer’s perspective there’s hardly any happening. Basically there are several symbols that are attracted towards the screen. By dragging one icon atop another you may produce a new element, i.e. both original symbols disappear and therefore are changed with a new icon. Yes, this can be a very mechanical point of view and absolutely simplified to what’s happening underneath the hood however it works as a good beginning point and goal.

Here’s some sample code that puts a control button on screen (that actually does not have to be there,) draws a symbol in the heart of the vista and enables the consumer to drag the icon around. It consists of an insect and extremely is not blog worthy but I have seen a bazillion SO questions regarding TouchEvents. Hope this can help someone, somewhere&hellip

public class Dragable stretches Activity Known as once the activity is first produced. */
public void onCreate(Bundle savedInstanceState) primary)
final Assets res = getResources()
mTiles = res.getDrawable(R.drawable.tiles)
mDrawHeight = mTiles.getIntrinsicHeight()
mDrawWidth = mTiles.getIntrinsicWidth()
final SurfaceView surf = (SurfaceView)findViewById(
surf.setOnTouchListener( new SurfaceView.OnTouchListener()condition
public boolean onTouch(View v, MotionEvent event) situation MotionEvent.ACTION_Lower:
final int x = (int)event.getX()
final int y = (int)event.getY()
final Rect bounds = mTiles.getBounds()
moving = bounds.intersects(x, y, x+1, y+1)
return true
situation MotionEvent.ACTION_MOVE:
if( moving )

return true
situation MotionEvent.ACTION_UP:
moving = false
return true

return false

final Button addButton = (Button)findViewById(
addButton.setOnClickListener( new OnClickListener()

mDrawTiles = new DrawTiles( surf )

private interface DrawLogic
private class DrawTiles
public void draw(DrawLogic _logic)


The primary.xml file appears like this:


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