我正在嘗試通過使用RecyclerView. 但是,當我嘗試MenuItem為我的 ArrayList創建一個時,當我嘗試打開activity_menu.xml螢屏時應用程式崩潰。我將如何到達options_menu.xml人口稠密的地方activity_menu.xml RecyclerView?謝謝!
我的最終結果

我有的

活動選單.xml
<androidx.recyclerview.widget.RecyclerView
android:id="@ id/menuRecyclerView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="12dp"
android:layout_marginTop="12dp"
android:layout_marginEnd="12dp"
android:layout_marginBottom="12dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/view" />
選單活動.kt
class MenuActivity : AppCompatActivity() {
lateinit var menuAdapter: MenuAdapter
val menuList = ArrayList<MenuItem>()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_menu)
createMenu()
}
private fun createMenu() {
menuAdapter = MenuAdapter(this, menuList)
val menuRecycleView = findViewById<RecyclerView>(R.id.menuRecyclerView)
menuRecycleView.apply {
layoutManager = LinearLayoutManager(this@MenuActivity, LinearLayoutManager.VERTICAL, false)
adapter = menuAdapter
setHasFixedSize(true)
}
}
}
options_meny.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@ id/menu1"
android:icon="@drawable/outline_person_"
android:title="@string/my_profile" />
<item
android:id="@ id/menu2"
android:icon="@drawable/bookings_"
android:title="@string/my_bookings" />
<item
android:id="@ id/menu3"
android:icon="@drawable/payment_"
android:title="@string/payment" />
<item
android:id="@ id/menu4"
android:icon="@drawable/on_going_jobs_"
android:title="@string/on_going_jobst" />
<item
android:id="@ id/menu5"
android:icon="@drawable/settings_"
android:title="@string/settings" />
</menu>
item_menu.xml
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.card.MaterialCardView 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:layout_width="match_parent"
android:layout_height="50dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@ id/iconImageButton"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_marginStart="16dp"
android:background="@drawable/circle_shape"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:ignore="TouchTargetSizeCheck,SpeakableTextPresentCheck" />
<ImageView
android:id="@ id/iconImageView"
android:layout_width="15dp"
android:layout_height="15dp"
android:elevation="10dp"
app:layout_constraintBottom_toBottomOf="@ id/iconImageButton"
app:layout_constraintEnd_toEndOf="@ id/iconImageButton"
app:layout_constraintStart_toStartOf="@ id/iconImageButton"
app:layout_constraintTop_toTopOf="@ id/iconImageButton"
app:srcCompat="@drawable/profile_photo_"
android:contentDescription="@string/string_menu_icon_image" />
<TextView
android:id="@ id/menuLabelTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:text="@string/menu_label"
android:textAllCaps="false"
android:textColor="@color/black"
android:textSize="12sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toEndOf="@ id/iconImageButton"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@ id/menuArrowImageView"
android:layout_width="15dp"
android:layout_height="15dp"
android:layout_marginEnd="16dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/right_chevron_"
android:contentDescription="@string/menu_arrow" />
</androidx.constraintlayout.widget.ConstraintLayout>
</com.google.android.material.card.MaterialCardView>
選單項.kt
class MenuItem constructor(val menuName: String = "", val menuImage: String = "")
選單配接器.kt
class MenuAdapter(var context: Context, var list: ArrayList<MenuItem>) : RecyclerView.Adapter<MenuAdapter.MyViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
val v = LayoutInflater.from(parent?.context).inflate(R.layout.menu_item, parent, false)
return MyViewHolder(v)
}
override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
holder?.bindItems(list[position])
}
override fun getItemCount(): Int {
return list.size
}
class MyViewHolder(view: View) : RecyclerView.ViewHolder(view){
fun bindItems(items: MenuItem) {
val menuName = itemView.findViewById<TextView>(R.id.menuLabelTextView)
val menuImage = itemView.findViewById<ImageView>(R.id.iconImageView)
menuName.text = items.menuName
Picasso.get().load(items.menuImage).into(menuImage)
}
}
}
uj5u.com熱心網友回復:
實際上,您還沒有向串列中添加任何專案,并且基于此,回收站視圖沒有顯示任何內容,因為它的配接器的專案計數為零
轉載請註明出處,本文鏈接:https://www.uj5u.com/ruanti/395995.html
上一篇:Python子行程沒有將大括號作為引數傳遞?或者雙引號的問題
下一篇:當我嘗試從ViewModel更改ModalBottomSheetState時,此CoroutineContext中沒有MonotonicFrameClock
