Android- How To Drag A Picture On A Canvas
I need to drag an image like in a videogame. I have a few lines drawed and I need to drag it and see the lines drawed before 'out' of the window. I give you two images trying to he
Solution 1:
Check out Canvas.translate
It will "move" everything you draw afterwards the ammount you say in x and y axis.
Don't forget to save and restore it, like:
canvas.save();
canvas.translate(ammountX, ammountY);
// [draw your stuff here]
canvas.restore();
If your question is more towards how to detect the dragging effect, you have to Override your view's onTouchEvent method. Something like:
@Override
public boolean onTouchEvent (MotionEvent event){
if(event.getActionMasked() == MotionEvent.DOWN){
startX = event.getX();
startY = event.getY();
return true;
}else if(event.getActionMasked() == MotionEvent.MOVE){
ammountX = event.getX() - startX;
ammountY = event.getY() - startY;
return true;
}
return super.onTouchEvent(event);
}
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