我创建了一个recyclerView-

public class PlayerListRecyclerViewAdapter extends RecyclerView.Adapter<PlayerListRecyclerViewAdapter.ViewHolder>


 playerAdapter = new PlayerListRecyclerViewAdapter(this,cursor, playerDataSet);
        playerRecyclerView.setAdapter(playerAdapter);


一切正常,但是我创建了以下方法:

public void swapCursor(Cursor newCursor) {
    // Always close the previous mCursor first
    if (pCursor != null) pCursor.close();
    pCursor = newCursor;
    if (newCursor != null) {
        // Force the RecyclerView to refresh
        this.notifyDataSetChanged();
    }
}


但是,当我尝试从链接到适配器的活动中调用它时,找不到它:

 new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.RIGHT) {
            @Override
            public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
                //Do nothing, we are not moving anything
                //But maybe we can let the user arrange their list?
                return false;
            }

            @Override
            public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
                long id = (long) viewHolder.itemView.getTag();
                removePlayer(id);
                playerAdapter.swapCursor(getAllPlayers());

            }
        }).attachToRecyclerView(playerRecyclerView);
    }


交换光标为红色,并且在适配器中显示从未使用的消息。

我正在尝试遵循:

https://github.com/udacity/ud851-Exercises/blob/student/Lesson07-Waitlist/T07.05-Solution-AddGuests/app/src/main/java/com/example/android/waitlist/GuestListAdapter.java

但是我不确定我缺少什么吗?
其他一切正常,我可以滑动,它会加载详细信息。出于某种原因仅调用此方法都不好用。

最佳答案

请检查您的播放器适配器获取的是空值。

因为swapCursor方法在定义playeradapter对象之后访问。

if(playerAdapter!=null){
playerAdapter.swapCursor(getAllPlayers());
}

关于java - 无法从RecyclerView适配器类调用方法,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/50100060/

10-12 06:08