如何在Recycler View中插入元素？

Question

我对RecyclerView有问题。每当我尝试管理用于插入，删除或更新某些元素的Rec View时，我都必须与Recycler View和邪恶的notifyDataSetChange进行斗争。

我尝试过runOnUiThread，每次此解决方案都无用。我试图在实例或“ Rec View”实例的“ Activity”中调用notifyDataSetChange。

我真的需要知道如何每次都能成为一名更好的开发人员。我真的希望绝对能解决这个问题。

这是我的新尝试

public class MainActivity extends AppCompatActivity {


    private Button nextTurn;
    private Button submit;
    private EditText name;
    private EditText number;

    private CounterElementAdapter mAdapter;
    private RecyclerView recV;
    private List<CounterElement> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        nextTurn = (Button) findViewById(R.id.button2);
        submit = (Button) findViewById(R.id.button);
        name = (EditText) findViewById(R.id.editText);
        number = (EditText) findViewById(R.id.editText2);
        recV = (RecyclerView) findViewById(R.id.recV);

        list = new ArrayList<CounterElement>();

        mAdapter = new CounterElementAdapter(list);
        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
        recV.setLayoutManager(mLayoutManager);
        recV.setItemAnimator(new DefaultItemAnimator());
        recV.setAdapter(mAdapter);

        submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(name.getText().toString().length() > 0 && number.getText().toString().length() > 0) {
                    mAdapter.addElement(new CounterElement(name.getText().toString(), Integer.parseInt(number.getText().toString())));
                }
            }
        });

        nextTurn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mAdapter.nextTurn();
            }
        });
    }
} 

public class CounterElementAdapter extends RecyclerView.Adapter<CounterElementAdapter.MyViewHolder> {

    private List<CounterElement> elementList;

    public class MyViewHolder extends RecyclerView.ViewHolder {

        public TextView name, counter;

        public MyViewHolder(View view) {
            super(view);
            name = view.findViewById(R.id.name);
            counter = view.findViewById(R.id.counter);
        }
    }


    public CounterElementAdapter(List<CounterElement> elementList) {
        this.elementList = elementList;
    }

    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.element, parent, false);

        return new MyViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        CounterElement ce = elementList.get(position);
        holder.name.setText(ce.getName());
        holder.counter.setText(ce.getDuration());
    }

    @Override
    public int getItemCount() {
        return elementList.size();
    }

    public void addElement(CounterElement ce){
        elementList.add(ce);
        notifyDataSetChanged();
    }

    public void nextTurn(){
        for(CounterElement ce : elementList){
            if(ce.getStatus() >= 1)
                ce.setStatus(ce.getStatus() - 1);
            else {
                elementList.remove(elementList.indexOf(ce));
                notifyDataSetChanged();
            }
        }
    }
}

提前感谢

Answer 1

[查看了一段时间的代码，似乎没有发现任何错误，您使用的是Android模拟器进行测试还是使用物理设备？有时，仿真器往往是越野车。首先尝试使用一些虚拟值初始化数组列表，然后尝试添加或删除并查看是否有帮助

Answer 2

您的代码看起来不错。我建议您看看这个article另外，请尝试调试代码并检查elementList是否正确更新。