[英]OnClickListener in fragment does not work anymore
我想實現一個小聊天應用程序,因此我需要一個發送按鈕來清除輸入字段並發送消息(現在只向回收站視圖添加一個元素)。 我已經實現了 OnClickListener 接口並將我的片段作為偵聽器添加到按鈕,但不知何故從未調用過 onClick。
class MainFragment : Fragment(), View.OnClickListener {
private val messageList = ArrayList<MessageData>()
val interactor = MainInteractor()
private lateinit var viewModel: MainViewModel
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View {
initRecycler()
InputButton.setOnClickListener(this)
return inflater.inflate(R.layout.main_fragment, container, false)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
}
private fun initRecycler(){
messageList.add(MessageData("Das ist die erste Nachricht", 0))
messageList.add(MessageData("Das ist die zweite Nachricht", 1))
messageList.add(MessageData("Das ist die dritte Nachricht,\nwelche über 2 Zeilen geht", 0))
val recyclerView: RecyclerView = recycler
val manager: RecyclerView.LayoutManager = LinearLayoutManager(requireActivity())
val adapter: RecyclerView.Adapter<*> = MessageAdapter(messageList)
recyclerView.layoutManager = manager
recyclerView.adapter = adapter
}
private fun sendMessage(){
messageList.add(MessageData(input_field.text.toString(), 0))
input_field.setText("")
}
override fun onClick(v: View?) {
Toast.makeText(context,"Button Pressed",Toast.LENGTH_SHORT).show()
sendMessage()
}
}
這就是我的 Fragment 中的代碼,我的布局看起來像這樣
<?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:background="@color/gray"
tools:context=".ui.main.MainFragment">
<TextView
android:id="@+id/ueberschrift"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="Chat"
android:textColor="@color/yellow"
android:textSize="30sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="@+id/divider"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="5dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:background="@color/yellow"
app:layout_constraintTop_toBottomOf="@+id/ueberschrift"
tools:layout_editor_absoluteX="1dp" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler"
android:layout_width="match_parent"
android:layout_height="0dp"
android:scrollbars="vertical"
android:layout_marginTop="20dp"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
app:layout_constraintTop_toBottomOf="@+id/divider"
app:layout_constraintBottom_toTopOf="@+id/textInputLayout">
</androidx.recyclerview.widget.RecyclerView>
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/textInputLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginBottom="20dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toStartOf="@id/InputButton"
app:layout_constraintBottom_toBottomOf="parent"
tools:layout_editor_absoluteX="1dp"
android:textColorHint="#FFFFFF">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/input_field"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="2"
android:textColor="#FFFFFF"
android:hint="Your Message"
/>
</com.google.android.material.textfield.TextInputLayout>
<Button
android:id="@+id/InputButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="20dp"
android:layout_marginStart="10dp"
android:text="Send"
android:textColor="#2E2E2E"
android:background = "@color/yellow"
app:layout_constraintStart_toEndOf="@id/textInputLayout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@id/textInputLayout"
app:layout_constraintBottom_toBottomOf="@id/textInputLayout"
/>
</androidx.constraintlayout.widget.ConstraintLayout>
這應該不難,因為這是一個基本的 Android 機制,但我不知道為什么這不起作用。 我錯過了什么?
您應該通知適配器有關數據更改的信息:
private fun sendMessage(){
messageList.add(MessageData(input_field.text.toString(), 0))
recycler.adapter.notifyDataSetChanged()
input_field.setText("")
}
嘗試以這種方式設置您的點擊監聽器:
class MainFragment : Fragment(R.layout.main_fragment) {
//...
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
InputButton.setOnClickListener {
InputButton.setOnClickListener(this)
sendMessage()
}
}
}
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