我正在使用drag-sort-listview (https://github.com/bauerca/drag-sort-listview) 在一个ListFragment中。
当我在创建时启用dragsort时,一切正常。但是,我希望将其禁用,直到长按列表视图中的其中一个项目。
因此,我想设置
mDslv.setDragEnabled(false);
需要在三个地方进行修改:onCreateView()、DragSortListView.DropListener 和 DragSortListView.RemoveListener。
在我的ListFragment中,我有以下代码:
listView.setOnItemLongClickListener( new AdapterView.OnItemLongClickListener(){
@Override
public boolean onItemLongClick(AdapterView<?> av, View v, int pos, long id) {
mDslv.setDragEnabled(true);
return true;
}
});
我希望长按任何项目都可以启用DSL并允许删除或移动该项目,之后DSL将再次禁用。
然而,在调用setDragEnabled(true)后(而不是同时),我遇到了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)
有人尝试过这个吗?有什么想法吗?看起来其中一个动作事件是NULL,可能是因为我在触摸事件期间启用了DSLV。