NPE when enabling the DSLV inside a longclick event.

[gomigbg]

I am using drag-sort-listview in a ListFragment.

Things are working when I enable the dragsort on creation. However, I would like to leave it disabled until a longclick on one of the items in the listview.

So I would like to set

mDslv.setDragEnabled(false);

in 3 places: onCreateView(), DragSortListView.DropListener, and DragSortListView.RemoveListener

In my ListFragment, I have:

        listView.setOnItemLongClickListener( new AdapterView.OnItemLongClickListener(){ 
            @Override 
            public boolean onItemLongClick(AdapterView<?> av, View v, int pos, long id) {
                mDslv.setDragEnabled(true);
                return true; 
            } 
        });

My hope is that a long click on any item will turn on the DSLV and allow that item to be dropped or removed, after which DSLV will be disabled again.

However, after (not while) the setDrageEnabled(true) is called, I get a NullPointerException:

09-03 00:03:33.749: E/AndroidRuntime(9703): FATAL EXCEPTION: main
09-03 00:03:33.749: E/AndroidRuntime(9703): java.lang.NullPointerException
09-03 00:03:33.749: E/AndroidRuntime(9703):     at com.mobeta.android.dslv.DragSortController.onScroll(DragSortController.java:381)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.GestureDetector.onTouchEvent(GestureDetector.java:541)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at com.mobeta.android.dslv.DragSortController.onTouch(DragSortController.java:243)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.View.dispatchTouchEvent(View.java:3881)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1703)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1133)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1687)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2196)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1880)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.os.Handler.dispatchMessage(Handler.java:99)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.os.Looper.loop(Looper.java:130)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at android.app.ActivityThread.main(ActivityThread.java:3729)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at java.lang.reflect.Method.invokeNative(Native Method)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at java.lang.reflect.Method.invoke(Method.java:507)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:876)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:634)
09-03 00:03:33.749: E/AndroidRuntime(9703):     at dalvik.system.NativeStart.main(Native Method)

Has anyone tried this? Any ideas? It looks like one of the motion events is NULL, probably because I am enabling DSLV during a touch event.

[AndroidInternal]

did you solve the problem?

[shruity]

I am having the same problem. Could anyone help me with this?

[leaderdevil]

To make the item focused on long click, I use dslv:drag_start_mode="onLongPress"

Below is the example

<com.mobeta.android.dslv.DragSortListView android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" dslv:drag_start_mode="onLongPress" />