Question

我尝试使用SwipeRefreshlayout更新Recyclerview中的所有项目，但不幸的是，只会更新最后一项，其他项目保持不变。

以下是我的相关代码：

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //LeakCanary.install(this.getApplication());

    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
        window.setStatusBarColor(ContextCompat.getColor(this, R.color.colorPrimaryDark));
    }

    handleArrayList(getApplicationContext(), 0);
    Log.d("Arraylist", "" + intentNumber2.size());

    recyclerView = (RecyclerView) findViewById(R.id.rv);
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
    linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(linearLayoutManager);
    recyclerView.setItemAnimator(null);
    recyclerView.setHasFixedSize(true);

    SimpleAdapter adapter = new SimpleAdapter();

    recyclerView.addItemDecoration(new SimpleDividerItemDecoration(this));
    recyclerView.setAdapter(adapter);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(getBaseContext(), AddReminder.class);
            startActivity(intent);
        }
    });

    adapter.notifyItemInserted(cards.size() - 1);

    refreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayout);

    updateRemainingTime();

    refreshLayout.setOnRefreshListener(this);
}

@Override
public void onRefresh() {
    updateRemainingTime();
}

//refresh the time remaining on the cards
private void updateRemainingTime() {

    if (!cards.isEmpty()) {

        for (int i = cards.size()-1; i >= 0; i--) {
            Card card = cards.get(i);

            String time = card.getCardTime();
            String date = card.getCardDate();

            Date now = new Date();
            Date then = null;
            try {
                then = sdtf.parse(date + " " + time);
            } catch (ParseException e) {
                Log.d("PARSEEXCEPTION:", " " + e);
            }

            String remainingTime = calculate.calcTimeDiff(then.getTime(), now.getTime());
            Log.d("Card","Card updated " + remainingTime);
            card.cardRemainingTime(remainingTime);
            recyclerView.getAdapter().notifyItemChanged(i);
        }

        refreshLayout.setRefreshing(false);
    } else {
        refreshLayout.setRefreshing(false);
    }
}

我的适配器：

    public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.ViewHolder> implements RemoveItem {

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

        return new ViewHolder(itemView, this);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Card card = cards.get(position);
        holder.setReminderText(card.getCardText());
        card_tv2.setText(card.getCardRemainingTime());
        holder.setSelectable(true);
    }

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

    @Override
    public void remove(int position) {
        cards.remove(position);
        Log.d("Main", "removed " + position);
        notifyItemRemoved(position);
        notifyItemRangeChanged(position, cards.size());

        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

        Intent intent1 = new Intent(getBaseContext(), AlarmReceiver.class);

        int intentNumber = intentNumber2.get(position);
        intentNumber2.remove(position);
        Log.d("IntentNumber", "" + intentNumber);

        PendingIntent alarmIntent = PendingIntent.getBroadcast(getApplicationContext(), intentNumber, intent1, PendingIntent.FLAG_CANCEL_CURRENT);
        alarmIntent.cancel();

        alarmManager.cancel(alarmIntent);

        File dir = getFilesDir();
        File file = new File(dir, "Reminder" + " " + position);
        boolean deleted = file.delete();

        MainActivity.handleArrayList(getApplicationContext(), 1);
    }

    public class ViewHolder extends SwappingHolder implements View.OnClickListener, View.OnLongClickListener {

        public final LinearLayout background;

        public ViewHolder(View itemView, RemoveItem removeItem1) {
            super(itemView, multiSelector);
            itemView.setOnClickListener(this);
            itemView.setOnLongClickListener(this);
            itemView.setLongClickable(true);
            removeItem = removeItem1;

            card_tv = (TextView) itemView.findViewById(R.id.card_tv);
            card_tv2 = (TextView) itemView.findViewById(R.id.card_tv2);
            card_th = (ImageView) itemView.findViewById(R.id.thumbnail);
            card_check = (ImageView) itemView.findViewById(R.id.card_check);
            background = (LinearLayout) itemView.findViewById(R.id.background);

        }


        @Override
        public void onClick(View view) {
            if (multiSelector.tapSelection(this)) {

                background.setSelected(true);

            } else {

                int position = getAdapterPosition();
                String text = "error";
                String time = "error";
                String date = "error";
                String repeat;
                boolean repeat2 = false;
                String quantity = "error";
                String mode = "error";

                try {
                    InputStream inputStream = openFileInput("Reminder" + " " + position);
                    InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
                    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                    text = bufferedReader.readLine();
                    time = bufferedReader.readLine();
                    date = bufferedReader.readLine();
                    repeat = bufferedReader.readLine();
                    repeat2 = repeat.equals("true");
                    quantity = bufferedReader.readLine();
                    mode = bufferedReader.readLine();
                    inputStreamReader.close();
                    bufferedReader.close();
                    inputStream.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }

                Intent intent2 = new Intent(getBaseContext(), ChangeReminder.class);
                intent2.putExtra("POSITION", position);
                intent2.putExtra("TIME", time);
                intent2.putExtra("DATE", date);
                intent2.putExtra("TEXT", text);
                intent2.putExtra("REPEAT", repeat2);
                intent2.putExtra("QUANTITY", quantity);
                intent2.putExtra("MODE", mode);
                startActivity(intent2);

            }
        }

        @Override
        public boolean onLongClick(View view) {
            AppCompatActivity activity = MainActivity.this;
            activity.startSupportActionMode(mDeleteMode);
            multiSelector.setSelectable(true);
            multiSelector.setSelected(this, true);
            background.setSelected(true);
            return true;
        }

        public void setReminderText(String cardText) {
            card_tv.setText(cardText);

            ColorGenerator colorGenerator = ColorGenerator.MATERIAL;
            TextDrawable drawableBuilder;
            String letter = "A";

            if (cardText != null && !cardText.isEmpty()) {
                letter = cardText.substring(0, 1);
            }

            int color = colorGenerator.getRandomColor();

            drawableBuilder = TextDrawable.builder()
                    .buildRound(letter, color);
            card_th.setImageDrawable(drawableBuilder);
          }
        }
      }
    }

卡类：

    public class Card implements Serializable {
public int drawable;
private String cardText;
private String cardDate;
private String cardTime;
private String cardRemainingTime;

public void cardText(String cardText) {
    this.cardText = cardText;
}

public void cardDate(String cardDate) {
    this.cardDate = cardDate;
}

public void cardTime(String cardTime) {
    this.cardTime = cardTime;
}

public void cardRemainingTime(String cardRemainingTime) {
    this.cardRemainingTime = cardRemainingTime;
}

public String getCardText() {
    return cardText;
}

public String getCardDate() {
    return cardDate;
}

public String getCardTime() {
    return cardTime;
}

public String getCardRemainingTime() {
    return cardRemainingTime;
  }
}

编辑：我发现当我重新打开应用程序时，时间会正确更新所有项目。这意味着从onRefresh和onCreate调用updateRemainingTime之间必须有区别，但我不知道哪个。任何帮助将不胜感激。

Answer 1

在updateRemainingTime方法中进行更改。

if (!cards.isEmpty()) {
        for (int i = cards.size() - 1; i >= 0; i--) {
            Card card = cards.get(i);
            String time = card.getCardTime();
            String date = card.getCardDate();

            Date now = new Date();
            Date then = null;
            try {
                then = sdtf.parse(date + " " + time);
            } catch (ParseException e) {
                Log.d("PARSEEXCEPTION:", " " + e);
            }

            String remainingTime = calculate.calcTimeDiff(then.getTime(), now.getTime());
            Log.d("Card", "Card updated " + remainingTime);
            //card.cardRemainingTime(remainingTime);
            //replaces to
            cards.get(i).cardRemainingTime(remainingTime);

        }
        List<Card> cardTemp = new ArrayList<>();
        cardTemp = cards;
        cards.clear();
        cards.addAll(cardTemp);
        recyclerView.notifyDataSetChanged();
    }

SwipeRefreshLayout仅正确更新上一个Recyclerview项目

1 个答案: