Question

代码询问用户是否要从recyclerview / mysql数据库中删除条目。该功能有效，但是，如果用户未选择任何项目，则仍需要从回收者视图中删除该项（临时），直到刷新屏幕，然后它才会回来。我尝试将removeItem（position）方法移动到yes / no方法中。但是，它声明必须将变量设为最终变量。如果我最终确定，它将破坏功能。我该如何以这种方式排列代码，即当用户单击时不会删除视口？

 /**
 * Method which removes a row from the recycler-view view-holder. Also captured the cbtId Primary Key which is sent
  * via Retrofit to the server to ensure the correct row is deleted from the database.
 * @param position
 */
public void removeItem(int position) {
    cbtId = mWorkoutLogList.get(position).getCbtId();
    mWorkoutLogList.remove(position);
    mWorkoutLogAdapter.notifyItemRemoved(position);
}


/**
 * On click method which calls the deleteLog() method to delete the row from the recycler view.
 * @param position
 */
@Override
public void onDeleteClick(int position) {

    deleteLog(position);

}


/**
 * Method which uses Retrofit to send a call to the MYSQL server to delete a workout log.
 */
private void deleteLog(int position){

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("Are you Sure?");
    builder.setMessage("Deleted Workout Logs cannot be restored.");
    builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {

            Call<WorkoutLogList> call = RetrofitClient.getInstance().getApi().deleteLog(cbtId);
            call.enqueue(new Callback<WorkoutLogList>() {
                @Override
                public void onResponse(Call<WorkoutLogList> call, Response<WorkoutLogList> response) {
                    removeItem(position);
                }

                @Override
                public void onFailure(Call<WorkoutLogList> call, Throwable t) {

                }
            });
        }
    });
    builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {

        }
    });

    AlertDialog ad = builder.create();
    ad.show();

}

Answer 1

将位置变量最终确定并移动到正确的位置即可解决此问题。

 @Override
    public void onClick(DialogInterface dialog, int which) {
        removeItem(position);
        Call<WorkoutLogList> call = RetrofitClient.getInstance().getApi().deleteLog(cbtId);
        call.enqueue(new Callback<WorkoutLogList>() {
            @Override
            public void onResponse(Call<WorkoutLogList> call, Response<WorkoutLogList> response) {

            }

removeItem（posiiton）方法仅在改装数据库调用之前放置，因为此方法获取cbtId，如果没有该id，则无法从数据库中删除行。

如果不将其设置为Final，则无法访问内部类中的变量

1 个答案: