mobile-development 相关问题

我的 Android 应用程序中有一个名为 ChatActivity 的活动。这是 xml 布局：我的 Android 应用程序中有一个名为 ChatActivity 的活动。这是 xml 布局： <?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/main" android:layout_width="match_parent" android:layout_height="match_parent" android:windowSoftInputMode="adjustResize" tools:context=".ui.home.ui.chat.ChatActivity"> <com.google.android.material.appbar.MaterialToolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:navigationIcon="?attr/homeAsUpIndicator" app:navigationIconTint="@color/black" app:title="@string/chat" app:titleCentered="true" > <de.hdodenhof.circleimageview.CircleImageView android:id="@+id/ivProfile" android:layout_width="@dimen/_30sdp" android:layout_height="@dimen/_30sdp" android:src="@drawable/ic_dummy_user" android:layout_marginHorizontal="@dimen/_10sdp" android:layout_gravity="end" /> </com.google.android.material.appbar.MaterialToolbar> <androidx.recyclerview.widget.RecyclerView android:id="@+id/rvMessages" android:layout_width="match_parent" android:layout_height="wrap_content" app:layout_constraintTop_toBottomOf="@id/toolbar" android:paddingBottom="@dimen/_95sdp" app:layout_constraintHorizontal_bias="1.0" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintVertical_bias="1.0" tools:listitem="@layout/item_message_sent" /> <com.google.android.material.textfield.TextInputLayout android:id="@+id/tiMessage" style="@style/textInputLayout" android:layout_width="0dp" android:layout_height="wrap_content" android:maxHeight="@dimen/_200sdp" android:layout_marginLeft="@dimen/_5sdp" android:layout_marginRight="@dimen/_35sdp" android:layout_marginTop="5dp" android:layout_marginBottom="5dp" app:errorEnabled="false" android:layout_marginVertical="@dimen/_5sdp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" > <com.google.android.material.textfield.TextInputEditText android:layout_width="match_parent" android:layout_height="wrap_content" android:maxHeight="@dimen/_200sdp" android:autofillHints="name" android:hint="@string/message" android:inputType="textMultiLine" /> </com.google.android.material.textfield.TextInputLayout> <ImageView android:id="@+id/ivSend" android:layout_width="@dimen/_25sdp" android:layout_height="@dimen/_25sdp" android:src="@drawable/ic_send_message" app:layout_constraintRight_toRightOf="parent" app:layout_constraintBottom_toBottomOf="parent" android:layout_marginBottom="@dimen/_12sdp" app:layout_constraintLeft_toRightOf="@id/tiMessage" app:tint="@color/blue" /> </androidx.constraintlayout.widget.ConstraintLayout> 当我打开 textInput 字段时，布局不适应它，它仅显示要打开的键盘，但是当我在键盘中键入时，它确实会在文本输入布局中键入，但在键入时用户无法看到文本输入布局。关闭键盘 + 回收视图开始从上到下滚动，但我希望它像聊天一样，从下到上。在添加的新消息上，它确实滚动到底部，但在现有列表的最后一项上，而不是在新项目上。我尝试过使用 android:windowSoftInputMode="adjustResize" 作为键盘和 private fun scrollToBottom() { binding.rvMessages.scrollToPosition(adapter.itemCount -1) } 用于回收视图。欢迎任何优化代码/改进的建议。我的活动代码是： @AndroidEntryPoint class ChatActivity : AppCompatActivity() { private lateinit var binding: ActivityChatBinding private lateinit var database: DatabaseReference private lateinit var adapter: ChatAdapter private var currentUserId: Int = 0 private var otherUserId: Int = 0 private lateinit var conversationId: String private var convoId = "" override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) enableEdgeToEdge() binding = ActivityChatBinding.inflate(layoutInflater) setContentView(binding.root) ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets -> val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars()) v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom) insets } binding.toolbar.setNavigationOnClickListener { onBackPressedDispatcher.onBackPressed() } val userDetails = intent.getParcelableExtra<ConnectionDetailDTO>("USER_DETAILS") val currentUser = Paper.book().read<User>(Constant.k_user) currentUserId = currentUser?.id!! otherUserId = userDetails?.id!! binding.toolbar.title = userDetails.name Glide.with(this).load(userDetails.profileUrl).placeholder(R.drawable.ic_dummy_user).into(binding.ivProfile) binding.ivProfile.setOnClickListener{showProfile()} adapter = ChatAdapter(currentUserId) binding.rvMessages.layoutManager = LinearLayoutManager(this) binding.rvMessages.adapter = adapter scrollToBottom() val database = FirebaseDatabase.getInstance() val reference = database.getReference("Conversations") reference.addValueEventListener(object : ValueEventListener { override fun onDataChange(dataSnapshot: DataSnapshot) { val messages = mutableListOf<Message>() for (conversationSnapshot in dataSnapshot.children) { val conversationIdParts = conversationSnapshot.key?.split("_") if (conversationIdParts?.size == 3) { val firstUserId = conversationIdParts[1] val secondUserId = conversationIdParts[2] convoId = "conversation_${firstUserId}_${secondUserId}" if (firstUserId == currentUserId.toString() && secondUserId == otherUserId.toString() || firstUserId == otherUserId.toString() && secondUserId == currentUserId.toString()) { val conversationMessages = mutableListOf<Message>() for (messageSnapshot in conversationSnapshot.child("messages").children) { val content = messageSnapshot.child("content").value.toString() val date = messageSnapshot.child("date").value.toString() val messageId = messageSnapshot?.child("id")?.value.toString() val isRead = messageSnapshot.child("isRead").value as? Boolean ?: false val name = messageSnapshot.child("name").value.toString() val senderEmail = messageSnapshot.child("senderEmail").value.toString() val type = messageSnapshot.child("type").value.toString() val message = Message(content, date, messageId, isRead, name, senderEmail, type) conversationMessages.add(message) Log.d(TAG, "onDataChange: $message") } messages.addAll(conversationMessages) } } } Log.d(TAG, "onDataChange: $messages") adapter.updateMessages(messages) } override fun onCancelled(databaseError: DatabaseError) { println("Error: ${databaseError.message}") } }) binding.ivSend.setOnClickListener { val messageText = binding.tiMessage.editText?.text.toString().trim() if (messageText.isNotEmpty()) { val conversationId1 = "conversation_${currentUserId}_${otherUserId}" val conversationId2 = "conversation_${otherUserId}_${currentUserId}" reference.child(conversationId1).get().addOnCompleteListener { task -> if (task.isSuccessful) { val data = task.result?.value val conversationId = if (data != null) { conversationId1 } else { conversationId2 } val messageReference = reference.child(conversationId).child("messages").push() val message = Message( content = messageText, date = SimpleDateFormat( "yyyy-MM-dd HH:mm:ss", Locale.getDefault() ).format(Date()), id = messageReference.key!!, isRead = false, name = currentUser?.name ?: "", senderEmail = currentUserId.toString(), type = "text" ) messageReference.setValue(message) binding.tiMessage.editText?.setText("") scrollToBottom() } } addUser(currentUserId.toString()) } } } private fun scrollToBottom() { binding.rvMessages.scrollToPosition(adapter.itemCount -1) } } 我尝试了 StackOverFLow 和 Chat GPT 的回收器视图解决方案回收视图开始从上到下滚动，但我希望它是就像聊天一样，从下到上。添加新消息后，它会滚动到底部，但在现有列表的最后一项上，而不是在新项目上。我尝试过使用.. recyclerView 从顶部开始并且不会在新项目上滚动到底部的原因是因为您在将项目添加到适配器之前调用了scrollToBottom()。删除scrollToBottom()中的binding.ivSend.setOnClickListener{}并将其添加到adapter.updateMessages(messages)下面 Log.d(TAG, "onDataChange: $messages") adapter.updateMessages(messages) scrollToBottom() 这样，当首次从数据库加载项目以及添加新项目时，回收器视图将向下滚动。为了更容易阅读代码，我建议您将代码排序到方法中，而不是将所有内容都放在 override fun onCreate(savedInstanceState: Bundle?) {} 中。 override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) enableEdgeToEdge() binding = ActivityChatBinding.inflate(layoutInflater) setContentView(binding.root) ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets -> val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars()) v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom) insets } setArgs() setupUI() setupDatabase() setupListeners() } private fun setArgs(){ userDetails = intent.getParcelableExtra<ConnectionDetailDTO>("USER_DETAILS") currentUser = Paper.book().read<User>(Constant.k_user) } private fun setupUI(){ //toolbar binding.toolbar.setNavigationOnClickListener { onBackPressedDispatcher.onBackPressed() } binding.toolbar.title = userDetails.name Glide.with(this).load(userDetails.profileUrl).placeholder(R.drawable.ic_dummy_user).into(binding.ivProfile) binding.ivProfile.setOnClickListener{showProfile()} //recycler view adapter = ChatAdapter(currentUser.id) binding.rvMessages.layoutManager = LinearLayoutManager(this) binding.rvMessages.adapter = adapter } private fun setupDatabase(){ database = FirebaseDatabase.getInstance() reference = database.getReference("Conversations") } private fun setupListeners(){ reference.addValueEventListener(object : ValueEventListener { override fun onDataChange(dataSnapshot: DataSnapshot) { val messages = mutableListOf<Message>() for (conversationSnapshot in dataSnapshot.children) { val conversationIdParts = conversationSnapshot.key?.split("_") if (conversationIdParts?.size == 3) { val firstUserId = conversationIdParts[1] val secondUserId = conversationIdParts[2] convoId = "conversation_${firstUserId}_${secondUserId}" if (firstUserId == currentUser.id.toString() && secondUserId == currentUser.id.toString() || firstUserId == userDetails.id.toString() && secondUserId == currentUser.id.toString()) { val conversationMessages = mutableListOf<Message>() for (messageSnapshot in conversationSnapshot.child("messages").children) { val content = messageSnapshot.child("content").value.toString() val date = messageSnapshot.child("date").value.toString() val messageId = messageSnapshot?.child("id")?.value.toString() val isRead = messageSnapshot.child("isRead").value as? Boolean ?: false val name = messageSnapshot.child("name").value.toString() val senderEmail = messageSnapshot.child("senderEmail").value.toString() val type = messageSnapshot.child("type").value.toString() val message = Message(content, date, messageId, isRead, name, senderEmail, type) conversationMessages.add(message) Log.d(TAG, "onDataChange: $message") } messages.addAll(conversationMessages) } } } Log.d(TAG, "onDataChange: $messages") adapter.updateMessages(messages) } override fun onCancelled(databaseError: DatabaseError) { println("Error: ${databaseError.message}") } }) binding.ivSend.setOnClickListener { val messageText = binding.tiMessage.editText?.text.toString().trim() if (messageText.isNotEmpty()) { val conversationId1 = "conversation_${currentUser.id}_${userDetails.id}" val conversationId2 = "conversation_${userDetails.id}_${currentUser.id}" reference.child(conversationId1).get().addOnCompleteListener { task -> if (task.isSuccessful) { val data = task.result?.value val conversationId = if (data != null) { conversationId1 } else { conversationId2 } val messageReference = reference.child(conversationId).child("messages").push() val message = Message( content = messageText, date = SimpleDateFormat( "yyyy-MM-dd HH:mm:ss", Locale.getDefault() ).format(Date()), id = messageReference.key!!, isRead = false, name = currentUser?.name ?: "", senderEmail = currentUser.id.toString(), type = "text" ) messageReference.setValue(message) binding.tiMessage.editText?.setText("") scrollToBottom() } } addUser(currentUser.id.toString()) } } } 最后我建议您阅读 MVVM 设计模式以获取更多代码结构。

android xml kotlin android-recyclerview mobile-development

回答 1 投票 0

致命异常：java.lang.UnsupportedOperationException：无法解析索引 5 处的属性：TypedValue{t=0x2/d=0x7f040109 a=23}

我遇到一条错误消息，每当我单击 MaterialDatePicker 时就会触发该消息。我认为它与 ThemeOverlay 有关，但我不知道如何摆脱它。这是错误消息...

java android android-studio material-components-android mobile-development

回答 1 投票 0

获取 java.lang.IndexOutOfBoundsException：对于我的适配器代码，索引 8 超出长度 8 的范围

我的 logcat 看起来像： logcat 应用程序崩溃类 ChatAdapter(private val currentUserId: Int) ： RecyclerView.Adapter() { 私有 val 消息 = mutableListO...

android kotlin android-recyclerview mobile-development

回答 1 投票 0

谁能告诉我美国亚马逊Android App的包名吗？因为不同国家的Amazon app的包名是不一样的

我需要使用亚马逊应用程序的包名称触发一个意图。但我正在构建的功能需要仅针对美国地区的亚马逊应用程序。我尝试了 VPN 并分享了来自 Google Play 的应用程序链接