how to add a line as a gesture while moving from one image to another?

Question

I am making my own Pattern Lock for android phone, i have Done the coding as when i click on an image it stores an integer in an array and when the user re-enters the same p

Answer 1

Implement onTouchEvent(MotionEvent ev), with ACTION_DOWN, ACTION_MOVE, ACTION_UP. As your finger moving, draw a line from previous Coordinate to current Coordinate.
Get coordinate by using ev.getX() ev.getY()
I've just thought of two solution currently:

1. When detecting touch event, at ACTION_DOWN, draw a transparent VIEW on top of parent view, make it Canvas and draw as long as ACTION_MOVE is under processing.
   
   
2. Use SurfaceView instead of regular View. A sample on SurfaceView to draw: http://www.droidnova.com/playing-with-graphics-in-android-part-ii,160.html