Realization thought: 1 to use a class to represent the first point in the 9 points. Which retains the current point of the upper and lower left and right of the various positions, etc. 2 custom GroupView, used to hold 9 points, 9 points of the display is through the ImageView. Copy the onLayout approach, make arrangement according to demand 3 the definition of a line drawing of View, carbon onTouchEvent method, draw line operation in this method. 4. Determine the fingers of a user s current location, remove the current position to compare with each point in the nine point position, if the location of the user within a certain point, so when the replacement of the background image.

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