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POImplementing drag and drop with multi-touch in Android
 

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  1. POImplementing drag and drop with multi-touch in Android
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    <p>I'm looking for a way to implement drag and drop with multi touch in my application. I have many views and I want that a first user drag a view in the same time than a second user is dragging an other view.</p> <p>My single touch drag and drop works well, here is a part of my code (my views are implementing this listener. onDragStart records the point touched, onDragContinuing change the position of the view and onDrop check if the position is valid) :</p> <pre><code>public boolean onTouch(View v, MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { return onDragStart(event.getX(), event.getY()); } else if (event.getAction() == MotionEvent.ACTION_MOVE){ return onDragContinuing(event.getRawX(), event.getRawY()); } else if (event.getAction() == MotionEvent.ACTION_UP){ return onDrop(event.getRawX(), event.getRawY()); } else{ return false; } } </code></pre> <p>I have tried to implement the multitouch like that, but it doesn't works :</p> <pre><code>private static final int INVALID_POINTER_ID = -1; // The ‘active pointer’ is the one currently moving our object. private int mActivePointerId = INVALID_POINTER_ID; public boolean onTouch(View v, MotionEvent event) { int action = event.getAction(); int actionCode = action &amp; MotionEvent.ACTION_MASK; switch(actionCode){ case MotionEvent.ACTION_DOWN :{ Toast.makeText(getContext(), "down", Toast.LENGTH_SHORT).show(); // Save the ID of this pointer mActivePointerId = event.getPointerId(0); return onDragStart(event.getX(), event.getY()); } case MotionEvent.ACTION_POINTER_DOWN :{ Toast.makeText(getContext(), "pointer down", Toast.LENGTH_SHORT).show(); // Save the ID of this pointer // Extract the index of the pointer that left the touch sensor final int pointerIndex = (action &amp; MotionEvent.ACTION_POINTER_ID_MASK) &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT; mActivePointerId = event.getPointerId(pointerIndex); return onDragStart(event.getX(mActivePointerId), event.getY(mActivePointerId)); } case MotionEvent.ACTION_MOVE :{ Toast.makeText(getContext(), "move", Toast.LENGTH_SHORT).show(); final int pointerIndex = (action &amp; MotionEvent.ACTION_POINTER_ID_MASK) &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT; final int mCurrentPointerId = event.getPointerId(pointerIndex); if (mActivePointerId == mCurrentPointerId){ return onDragContinuing(getRawX(event, mActivePointerId), getRawY(event, mActivePointerId)); } else return false; } case MotionEvent.ACTION_UP :{ Toast.makeText(getContext(), "up", Toast.LENGTH_SHORT).show(); final int pointerIndex = (action &amp; MotionEvent.ACTION_POINTER_ID_MASK) &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT; final int mCurrentPointerId = event.getPointerId(pointerIndex); if (mActivePointerId == mCurrentPointerId){ return onDrop(event.getRawX(), event.getRawY()); } else return false; } case MotionEvent.ACTION_POINTER_UP :{ Toast.makeText(getContext(), "pointer up", Toast.LENGTH_SHORT).show(); final int pointerIndex = (action &amp; MotionEvent.ACTION_POINTER_ID_MASK) &gt;&gt; MotionEvent.ACTION_POINTER_ID_SHIFT; final int mCurrentPointerId = event.getPointerId(pointerIndex); if (mActivePointerId == mCurrentPointerId){ return onDrop(getRawX(event, pointerIndex), getRawY(event, pointerIndex)); } else return false; } default :{ return false; } } } /** * MotionEvent has no getRawX(int) method; simulate it pending future API approval. */ private static float getRawX(MotionEvent event, int pointerIndex) { float offset = event.getX() - event.getRawX(); return event.getX(pointerIndex) + offset; } /** * MotionEvent has no getRawY(int) method; simulate it pending future API approval. */ private static float getRawY(MotionEvent event, int pointerIndex) { float offset = event.getY() - event.getRawY(); return event.getY(pointerIndex) + offset; } </code></pre> <p>What's wrong ? Can you help me ? Thanks you !</p>
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