Im trying to set an OnDragListener to certain words of a TextView using SpannableString. Im able to add an OnClick Listener by using ClickableSpan
by doing
hashText.setSpan(new ClickableSpan() { So I figured I would try the same but replace ClickableSpan with OnDragListener.
I'm able to read the different drag events, but I have not been able to isolate the drag events to the specific words I choose, as Im able to do with ClickableSpan.
hashText.setSpan(new View.OnDragListener() { @Override public boolean onDrag(View targetView, DragEvent event) { int action = event.getAction(); TextView targetVariable = (TextView) targetView; String textGetter; textGetter = targetVariable.getText().toString(); // boolean actionDropOutside = (DragEvent.ACTION_DRAG_ENDED != DragEvent.ACTION_DROP); switch (event.getAction()) { case DragEvent.ACTION_DRAG_STARTED: Log.d(TAG, "DRAG STARTED"); break; case DragEvent.ACTION_DRAG_ENTERED: ////create method that checks if text is empty if so lights up //if (textGetter.equals("")) { targetView.setBackgroundColor(CARD_SLECTED); //lightupVariableCard(cardV); Log.d(TAG, "DRAG ENTERED EMPTY TEXT"); //} Log.d(TAG, "DRAG ENTERED" + targetVariable.getText().toString()); break; case DragEvent.ACTION_DRAG_EXITED: targetView.setBackgroundColor(CARD_UNSLECTED); Log.d(TAG, "DRAG EXITED"); break; case DragEvent.ACTION_DROP: // Dropped, reassign View to ViewGroup //if (textGetter.equals("")) { TextView draggedView = (TextView) event.getLocalState(); ViewGroup owner = (ViewGroup) draggedView.getParent(); targetVariable.setText(draggedView.getText()); owner.setVisibility(View.INVISIBLE); targetView.setBackgroundColor(CARD_UNSLECTED); //fabDisplayCounter++; //displayFab(); Log.d(TAG, "DRAG DROPPED"); //} Log.d(TAG, "DRAG NOT POSSSIBLE HERE"); break; case DragEvent.ACTION_DRAG_ENDED: // if (actionDropOutside == true){ // Log.d(TAG, "DRAG DROPPED OUTSIDE TRUE"); // } Log.d(TAG, "DRAG ENDED"); //default: } return true; } }, matcher.start(), matcher.end(), i); the_question.setText(hashText); the_question.setMovementMethod(LinkMovementMethod.getInstance()); //the_question.setOnDragListener(new MyDragListener(hashText.nextSpanTransition())); 1 Answers
Answers 1
I'm not a big expert in this field, never had to dig it out. But since you have no replies I try to give you some hint / direction.
I think what you need is a custom MovementMethod.
The android platform MovementMethod are managed here inside this package: https://github.com/android/platform_frameworks_base/tree/master/core/java/android/text/method
Specifically this interface: https://github.com/android/platform_frameworks_base/blob/master/core/java/android/text/method/MovementMethod.java
As you see it has a onTouchEvent() method.
ClickableSpan has an onClick method, but it only works because there's a LinkMovementMethod handling the touch events, looking for ClickableSpan and issuing the onClick() on them.
which extend: https://github.com/android/platform_frameworks_base/blob/master/core/java/android/text/method/ScrollingMovementMethod.java
which extend https://github.com/android/platform_frameworks_base/blob/master/core/java/android/text/method/BaseMovementMethod.java
but this last is not really related with touches.
ScrollingMovementMethod use the class Touch to delegate the touch event handling, you can see this class here: https://github.com/android/platform_frameworks_base/blob/master/core/java/android/text/method/Touch.java
Looking at the code very quickly I think you can extend the LinkMovementMethod and add the drag detection there. Then create a new Span type for the Drag and call the dragging methods inside it.
I know I did not gave you a solution but I hope I pointed you in the right direction.
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