android - 在 RecyclerView 中配置 ItemTouchHelper 以处理被显示的另一个 Snackbar 关闭的 Snackbar-6ren

android - 在 RecyclerView 中配置 ItemTouchHelper 以处理被显示的另一个 Snackbar 关闭的 Snackbar

转载作者：行者123 更新时间：2023-12-05 00:04:19

我的应用程序中有一个包含消息的 RecyclerView。在向右滑动时，我将其配置为删除消息，在向左滑动时，我将其配置为存档消息。下面是 ItemTouchHelper 部分删除归档相关的代码:

if (direction == ItemTouchHelper.LEFT) {
    donorMessagesAdapter.deleteMessages(position);
} else if (direction == ItemTouchHelper.RIGHT) {
    donorMessagesAdapter.archiveMessages(position);
}

下面是 deleteMessages() 和 archiveMessages() 函数(它们几乎相同):

public void deleteMessages(final int position) {
    recentlyDeletedPeer = sortedPeers.get(position);
    recentlyDeletedPeerPosition = position;

    sortedPeers.remove(position);
    notifyItemRemoved(position);

    Snackbar snackbar = Snackbar.make(activity.findViewById(R.id.constraint_layout),
            "Messages Deleted", Snackbar.LENGTH_LONG);
    snackbar.setAction("UNDO", new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            sortedPeers.add(recentlyDeletedPeerPosition, recentlyDeletedPeer);
            notifyItemInserted(recentlyDeletedPeerPosition);
        }
    });
    snackbar.setActionTextColor(0xff0099ff);

    snackbar.addCallback(new Snackbar.Callback() {
        @Override
        public void onDismissed(Snackbar snackbar, int event) {
            if (event == Snackbar.Callback.DISMISS_EVENT_TIMEOUT || event == Snackbar.Callback.DISMISS_EVENT_CONSECUTIVE) {
                MainActivity.database.receivedMessagesDao().deleteAllReceivedMessagesFromSender(email, recentlyDeletedPeer);
                MainActivity.database.sentMessagesDao().deleteAllSentMessagesFromReceiver(email, recentlyDeletedPeer);
            }
        }
    });

    snackbar.show();
}

public void archiveMessages(final int position) {
    recentlyArchivedPeer = sortedPeers.get(position);
    recentlyArchivedPeerPosition = position;

    sortedPeers.remove(position);
    notifyItemRemoved(position);

    Snackbar snackbar = Snackbar.make(activity.findViewById(R.id.constraint_layout),
            "Messages archived", Snackbar.LENGTH_LONG);
    snackbar.setAction("UNDO", new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            sortedPeers.add(recentlyArchivedPeerPosition, recentlyArchivedPeer);
            notifyItemInserted(recentlyArchivedPeerPosition);
        }
    });
    snackbar.setActionTextColor(0xff0099ff);

    snackbar.addCallback(new Snackbar.Callback() {
        @Override
        public void onDismissed(Snackbar snackbar, int event) {
            if (event == Snackbar.Callback.DISMISS_EVENT_TIMEOUT || event == Snackbar.Callback.DISMISS_EVENT_CONSECUTIVE) {
                MainActivity.database.receivedMessagesDao().archive(email, recentlyArchivedPeer);
                MainActivity.database.sentMessagesDao().archive(email, recentlyArchivedPeer);
            }
        }
    });

    snackbar.show();
}

删除/归档一条消息时一切正常。在 Snackbar 消失后滑动删除或存档消息，当我单击撤消时，删除/存档被逆转。删除/归档多条消息时会出现问题。

问题 1: 当我删除/存档多条消息而不等待每条消息的 Snackbar 消失时，除第一条消息外的所有消息都被删除/存档。让我感到奇怪的是，不仅仅是最后一条消息被删除/存档，除了第一条消息之外的所有消息都被删除/存档。

问题 2: 当我删除/归档多条消息而不等待每条消息的 Snackbar 消失时，如果我按下 UNDO，即在 Snackbar 上为最后一条被删除的消息/存档，应用程序崩溃。

顺便说一下，我正在使用 Room Library 将消息存储在数据库中(由 MainActivity.database 引用)。

我认为问题出在 Snackbar 的 addCallback() 函数中。我应该为 event == Snackbar.Callback.DISMISS_EVENT_CONSECUTIVE 和 event == Snackbar.Callback.DISMISS_EVENT_TIMEOUT 做一些不同的事情，但我不知道到底是什么我应该采取不同的做法，以及究竟是什么导致了问题。

这是我的整个适配器类供引用(错误消息行旁边标有注释):

package com.example.treeapp;

import android.app.Activity;
import android.content.Intent;
import android.os.Handler;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.snackbar.Snackbar;
import com.mikhaellopez.circularimageview.CircularImageView;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;

public class DonorMessagesAdapter extends RecyclerView.Adapter<DonorMessagesAdapter.DonorMessagesViewHolder> { // line 24 in error message
    private Activity activity;
    public String email;
    public List<String> sortedPeers;
    public static CircularImageView imageView;
    private String recentlyDeletedPeer;
    private int recentlyDeletedPeerPosition;
    private String recentlyArchivedPeer;
    private int recentlyArchivedPeerPosition;

    public static class DonorMessagesViewHolder extends RecyclerView.ViewHolder {
        public Button middleButton;
        public TextView nameTextView;
        public TextView messageTextView;

        DonorMessagesViewHolder(View view) {
            super(view);

            middleButton = view.findViewById(R.id.middle_button);
            imageView = view.findViewById(R.id.image_view);
            nameTextView = view.findViewById(R.id.text_view_name);
            messageTextView = view.findViewById(R.id.text_view_message);
        }
    }

    DonorMessagesAdapter(Activity activity, String email) {
        this.activity = activity;
        this.email = email;
        this.sortedPeers = getSortedPeers(email);
    }

    @NonNull
    @Override
    public DonorMessagesViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.message, parent, false);

        return new DonorMessagesViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull DonorMessagesViewHolder holder, int position) {
        final String current = sortedPeers.get(position);

        // Start of getting last message
        String lastMessage;
        String lastMessageType;
        List<Integer> receivedMessages = MainActivity.database.receivedMessagesDao().getMessagesToReceiverFromSender(email, current, 0);
        List<Integer> sentMessages = MainActivity.database.sentMessagesDao().getMessagesBySenderToReceiver(email, current, 0);

        if (sentMessages.size() == 0) {
            lastMessage = MainActivity.database.receivedMessagesDao().getMessage(receivedMessages.get(receivedMessages.size() - 1));  // line 74 in error message
            lastMessageType = "received";
            if (MainActivity.database.receivedMessagesDao().getImage(receivedMessages.get(receivedMessages.size() - 1)) == 1) {
                lastMessageType = "receivedImage";
            }
        } else if (receivedMessages.size() == 0) {
            lastMessage = MainActivity.database.sentMessagesDao().getMessage(sentMessages.get(sentMessages.size() - 1));
            lastMessageType = "sent";
            if (MainActivity.database.sentMessagesDao().getImage(sentMessages.get(sentMessages.size() - 1)) == 1) {
                lastMessageType = "sentImage";
            }
        } else {
            LocalDateTime lastReceivedMessageTime = LocalDateTime.parse(MainActivity.database.receivedMessagesDao().getTime(receivedMessages.get(receivedMessages.size() - 1)));
            LocalDateTime lastSentMessageTime = LocalDateTime.parse(MainActivity.database.sentMessagesDao().getTime(sentMessages.get(sentMessages.size() - 1)));

            if (lastReceivedMessageTime.isAfter(lastSentMessageTime)) {
                lastMessage = MainActivity.database.receivedMessagesDao().getMessage(receivedMessages.get(receivedMessages.size() - 1));
                lastMessageType = "received";
                if (MainActivity.database.receivedMessagesDao().getImage(receivedMessages.get(receivedMessages.size() - 1)) == 1) {
                    lastMessageType = "receivedImage";
                }
            } else {
                lastMessage = MainActivity.database.sentMessagesDao().getMessage(sentMessages.get(sentMessages.size() - 1));
                lastMessageType = "sent";
                if (MainActivity.database.sentMessagesDao().getImage(sentMessages.get(sentMessages.size() - 1)) == 1) {
                    lastMessageType = "sentImage";
                }
            }
        }
        // End of getting last message

        if (MainActivity.database.plantersDao().checkEmail(current) == 1) {
            if (MainActivity.database.plantersDao().getImageUrl(current) != null) {
                new DownloadImageTask(imageView).execute(MainActivity.database.plantersDao().getImageUrl(current));
            }
        } else if (MainActivity.database.donorsDao().checkEmail(current) == 1) {
            if (MainActivity.database.donorsDao().getImageUrl(current) != null) {
                new DownloadImageTask(imageView).execute(MainActivity.database.donorsDao().getImageUrl(current));
            }
        }

        if (MainActivity.database.plantersDao().checkEmail(current) == 1) {
            holder.nameTextView.setText(MainActivity.database.plantersDao().getName(current));
        } else if (MainActivity.database.donorsDao().checkEmail(current) == 1) {
            holder.nameTextView.setText(MainActivity.database.donorsDao().getName(current));
        }

        if (lastMessageType.equals("received")) {
            if (lastMessage.length() > 17) {
                holder.messageTextView.setText(lastMessage.substring(0, 16) + "...");
            } else {
                holder.messageTextView.setText(lastMessage);
            }
        } else if (lastMessageType.equals("sent")) {
            if (lastMessage.length() > 12) {
                holder.messageTextView.setText("You: " + lastMessage.substring(0, 11) + "...");
            } else {
                holder.messageTextView.setText("You: " + lastMessage);
            }
        } else if (lastMessageType.equals("receivedImage")) {
            holder.messageTextView.setText("Image");
        } else if (lastMessageType.equals("sentImage")) {
            holder.messageTextView.setText("You: " + "Image");
        }

        holder.middleButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(view.getContext(), MessageActivity.class);
                intent.putExtra("email", email);
                intent.putExtra("peerEmail", current);
                intent.putExtra("archived", 0);

                view.getContext().startActivity(intent);
            }
        });
    }

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

    public void reload() {
        sortedPeers = getSortedPeers(email);
        notifyDataSetChanged();
    }

    private List<String> getSortedPeers(String email) {
        List<String> senders = MainActivity.database.receivedMessagesDao().getSendersForReceiver(email, 0);
        List<String> receivers = MainActivity.database.sentMessagesDao().getReceiversForSender(email, 0);

        List<String> peers = new ArrayList<>();
        peers.addAll(senders);
        peers.addAll(receivers);
        peers = new ArrayList<>(new HashSet<>(peers));

        List<String> sortedPeers = new ArrayList<>();
        while (peers.size() > 0) {
            LocalDateTime latestMessageTime = null;
            String latestPeer = null;

            for (String peer : peers) {
                List<Integer> receivedMessages = MainActivity.database.receivedMessagesDao().getMessagesToReceiverFromSender(email, peer, 0);
                List<Integer> sentMessages = MainActivity.database.sentMessagesDao().getMessagesBySenderToReceiver(email, peer, 0);

                LocalDateTime lastMessageTime;
                if (sentMessages.size() == 0) {
                    lastMessageTime = LocalDateTime.parse(MainActivity.database.receivedMessagesDao().getTime(receivedMessages.get(receivedMessages.size() - 1)));
                } else if (receivedMessages.size() == 0) {
                    lastMessageTime = LocalDateTime.parse(MainActivity.database.sentMessagesDao().getTime(sentMessages.get(sentMessages.size() - 1)));
                } else {
                    LocalDateTime lastReceivedMessageTime = LocalDateTime.parse(MainActivity.database.receivedMessagesDao().getTime(receivedMessages.get(receivedMessages.size() - 1)));
                    LocalDateTime lastSentMessageTime = LocalDateTime.parse(MainActivity.database.sentMessagesDao().getTime(sentMessages.get(sentMessages.size() - 1)));

                    if (lastReceivedMessageTime.isAfter(lastSentMessageTime)) {
                        lastMessageTime = lastReceivedMessageTime;
                    } else {
                        lastMessageTime = lastSentMessageTime;
                    }
                }

                if (latestMessageTime != null) {
                    if (lastMessageTime.isAfter(latestMessageTime)) {
                        latestMessageTime = lastMessageTime;
                        latestPeer = peer;
                    }
                } else {
                    latestMessageTime = lastMessageTime;
                    latestPeer = peer;
                }
            }

            sortedPeers.add(latestPeer);
            peers.remove(latestPeer);
        }

        return sortedPeers;
    }

    public void deleteMessages(final int position) {
        recentlyDeletedPeer = sortedPeers.get(position);
        recentlyDeletedPeerPosition = position;

        sortedPeers.remove(position);
        notifyItemRemoved(position);

        Snackbar snackbar = Snackbar.make(activity.findViewById(R.id.constraint_layout),
                "Messages Deleted", Snackbar.LENGTH_LONG);
        snackbar.setAction("UNDO", new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                sortedPeers.add(recentlyDeletedPeerPosition, recentlyDeletedPeer);
                notifyItemInserted(recentlyDeletedPeerPosition);
            }
        });
        snackbar.setActionTextColor(0xff0099ff);

        snackbar.addCallback(new Snackbar.Callback() {
            @Override
            public void onDismissed(Snackbar snackbar, int event) {
                if (event == Snackbar.Callback.DISMISS_EVENT_TIMEOUT || event == Snackbar.Callback.DISMISS_EVENT_CONSECUTIVE) {
                    MainActivity.database.receivedMessagesDao().deleteAllReceivedMessagesFromSender(email, recentlyDeletedPeer);
                    MainActivity.database.sentMessagesDao().deleteAllSentMessagesFromReceiver(email, recentlyDeletedPeer);
                }
            }
        });

        snackbar.show();
    }

    public void archiveMessages(final int position) {
        recentlyArchivedPeer = sortedPeers.get(position);
        recentlyArchivedPeerPosition = position;

        sortedPeers.remove(position);
        notifyItemRemoved(position);

        Snackbar snackbar = Snackbar.make(activity.findViewById(R.id.constraint_layout),
                "Messages archived", Snackbar.LENGTH_LONG);
        snackbar.setAction("UNDO", new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                sortedPeers.add(recentlyArchivedPeerPosition, recentlyArchivedPeer);
                notifyItemInserted(recentlyArchivedPeerPosition);
            }
        });
        snackbar.setActionTextColor(0xff0099ff);

        snackbar.addCallback(new Snackbar.Callback() {
            @Override
            public void onDismissed(Snackbar snackbar, int event) {
                if (event == Snackbar.Callback.DISMISS_EVENT_TIMEOUT || event == Snackbar.Callback.DISMISS_EVENT_CONSECUTIVE) {
                    MainActivity.database.receivedMessagesDao().archive(email, recentlyArchivedPeer);
                    MainActivity.database.sentMessagesDao().archive(email, recentlyArchivedPeer);
                    reload();
                }
            }
        });

        snackbar.show();
    }
}

这是我得到的错误(我的类标有 **):

2020-09-12 19:24:11.547 689-689/com.example.treeapp E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.treeapp, PID: 689
    java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
        at java.util.ArrayList.get(ArrayList.java:439)
        **at com.example.treeapp.DonorMessagesAdapter.onBindViewHolder(DonorMessagesAdapter.java:74)
        at com.example.treeapp.DonorMessagesAdapter.onBindViewHolder(DonorMessagesAdapter.java:24)**
        at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
        at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
        at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
        at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
        at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2303)
        at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1627)
        at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1587)
        at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:665)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
        at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
        at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
        at android.view.View.layout(View.java:20967)
        at android.view.ViewGroup.layout(ViewGroup.java:6440)
        at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1762)
        at android.view.View.layout(View.java:20967)
        at android.view.ViewGroup.layout(ViewGroup.java:6440)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:20967)
        at android.view.ViewGroup.layout(ViewGroup.java:6440)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:20967)
        at android.view.ViewGroup.layout(ViewGroup.java:6440)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at android.view.View.layout(View.java:20967)
        at android.view.ViewGroup.layout(ViewGroup.java:6440)
        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791)
        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635)
        at android.widget.LinearLayout.onLayout(LinearLayout.java:1544)
        at android.view.View.layout(View.java:20967)
        at android.view.ViewGroup.layout(ViewGroup.java:6440)
        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
        at com.android.internal.policy.DecorView.onLayout(DecorView.java:955)
        at android.view.View.layout(View.java:20967)
        at android.view.ViewGroup.layout(ViewGroup.java:6440)
        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3092)
        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2779)
        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1863)
        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:8072)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
        at android.view.Choreographer.doCallbacks(Choreographer.java:723)
        at android.view.Choreographer.doFrame(Choreographer.java:658)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)

最佳答案

要解决您的第一个问题，您可以尝试只检查解雇是否是由点击引起的，例如:

snackbar.addCallback(new Snackbar.Callback() {
    @Override
    public void onDismissed(Snackbar snackbar, int event) {
        if (event != Snackbar.Callback.DISMISS_EVENT_ACTION) {
            MainActivity.database.receivedMessagesDao().deleteAllReceivedMessagesFromSender(email, recentlyDeletedPeer);
            MainActivity.database.sentMessagesDao().deleteAllSentMessagesFromReceiver(email, recentlyDeletedPeer);
        }
    }
});

至于你的第二个问题，崩溃的发生是因为你只检查 sentMessages 列表是否为空

if (sentMessages.size() == 0) {
        lastMessage = MainActivity.database.receivedMessagesDao().getMessage(receivedMessages.get(receivedMessages.size() - 1));  // line 74 in error message
        lastMessageType = "received";
        if (MainActivity.database.receivedMessagesDao().getImage(receivedMessages.get(receivedMessages.size() - 1)) == 1) {
            lastMessageType = "receivedImage";
        }
    }

您在这里忘记做的是检查 reveivedMessages 是否也为空。例如:

if (sentMessages.size() == 0) {
    if(receivedMessages.size() != 0) {
        lastMessage = MainActivity.database.receivedMessagesDao().getMessage(receivedMessages.get(receivedMessages.size() - 1));  // line 74 in error message
        lastMessageType = "received";
        if (MainActivity.database.receivedMessagesDao().getImage(receivedMessages.get(receivedMessages.size() - 1)) == 1) {
            lastMessageType = "receivedImage";
        }
    }
}

发生的情况是您的 receivedMessages 列表也是空的，这意味着您尝试获取位置 -1 的项目，这显然行不通。

即使这些技巧解决了您的问题，您也应该认真考虑如何访问数据库中的数据，因为您似乎在 UI 线程上执行所有调用，这是不可取的，因为它会阻塞 UI 线程。

关于android - 在 RecyclerView 中配置 ItemTouchHelper 以处理被显示的另一个 Snackbar 关闭的 Snackbar，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63861451/

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我们最近切换到 Java 8 以使用 java.time API(LocalDate、LocalDateTime，...)。因此，我们将 Hibernate 依赖项更新到版本 4.3.10。我们编写了
quarkus实战之六：配置
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NGINX 配置 :
我是 NGINX 的新手，我正在尝试对我们的 ERP 网络服务器进行负载平衡。我有 3 个网络服务器在由 websphere 提供支持的端口 80 上运行，这对我来说是一个黑盒子: * web01.e
Gerrit 配置
我们想使用 gerrit 进行代码审查，但我们在 webview 中缺少一些设置。是否可以禁止提交者审查/验证他们自己的提交？是否有可能两个审稿人给 +1 一个累积它到+2，以便可以提交？谢
AEM 配置
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Neo4j 配置
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CELERYD_OPTS 配置
我在/etc/default/celeryd 中有以下配置 CELERYD_NODES = "worker1 worker2 worker3" CELERYD_CHDIR = "path to pro
Plone 配置
Plone 在其页面中显示来 self 的母语(巴西葡萄牙语)的特殊字符。但是，当我使用我创建的 spt 页面时，它会显示转义序列，例如: Educa\xc3\xa7\xc3\xa3o 代替 Educ
Emacs 配置
我正在尝试开始使用 Emacs/Clojure。安装 emacs 扩展的正确方法是什么。我正在尝试安装以下插件: https://bitbucket.org/kotarak/vimclojure 我已
CMake 配置
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android - 在 RecyclerView 中配置 ItemTouchHelper 以处理被显示的另一个 Snackbar 关闭的 Snackbar