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I want to make a simple doodle application, for android, but I don't know how to get some data from android! I need:
The position of the mouse before and after the drag or if it is a simple touch how to get the position of the touch.
How should I go about drawing the lines?
Can somebody please help me?
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Drag event listeners and callback methods A View receives drag events with either a drag event listener that implements View. OnDragListener or with the view's onDragEvent() callback method.
ACTION_DRAG_ENTERED. Action constant returned by getAction() : Signals to a View that the drag point has entered the bounding box of the View. If the View can accept a drop, it can react to ACTION_DRAG_ENTERED by changing its appearance in a way that tells the user that the View is the current drop target.
The draw() method is called by the framework when the view need to be re-drawn and the draw() method then calls the onDraw() to draw the view's content.
You can override the onTouchEvent method in your View:
@Override
public boolean onTouchEvent (MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
start_x = event.getX();
start_y = event.getY();
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
//create the line from start_x and start_y to the current location
//don't forget to invalidate the View otherwise your line won't get redrawn
} else if (event.getAction() == MotionEvent.ACTION_UP) {
//might not need anything here
}
return true;
}
I am assuming you want to draw a straight line from the start of the drag to the endpoint and you don't want to "doodle", but its pretty simple to modify this code to handle either.
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