我在使用replace函数更改主"活动"的框架时遇到此错误，我创建的片段显示类型不匹配所需的片段已找到DashboardFragmentCompapnion
package com.shivanshu.bookhub
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.MenuItem
import android.widget.FrameLayout
import android.widget.Toast
import android.widget.Toolbar
import androidx.appcompat.app.ActionBarDrawerToggle
import androidx.coordinatorlayout.widget.CoordinatorLayout
import androidx.core.view.GravityCompat
import androidx.drawerlayout.widget.DrawerLayout
import com.google.android.material.navigation.NavigationView
class MainActivity : AppCompatActivity() {
lateinit var drawerLayout: DrawerLayout
lateinit var coordinatorLayout: CoordinatorLayout
lateinit var toolbar: androidx.appcompat.widget.Toolbar
lateinit var frameLayout: FrameLayout
lateinit var navigationView: NavigationView
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
drawerLayout = findViewById(R.id.drawerLayout)
coordinatorLayout = findViewById(R.id.coordinatorLayout)
toolbar = findViewById(R.id.toolbar)
frameLayout = findViewById(R.id.frameLayout)
navigationView = findViewById(R.id.navigationView)
setUpToolbar()
val actionBarDrawerToggle = ActionBarDrawerToggle(
this@MainActivity,
drawerLayout,
R.string.open_drawer,
R.string.close_drawer
)
drawerLayout.addDrawerListener(actionBarDrawerToggle)
actionBarDrawerToggle.syncState()
navigationView.setNavigationItemSelectedListener {
when(it.itemId){
R.id.dashboard -> {
supportFragmentManager.beginTransaction().
replace(R.id.frameLayout, DashboardFragment).commit()
}
R.id.profile ->{
Toast.makeText(this@MainActivity,"Profile Clicked",Toast.LENGTH_LONG)
}
R.id.about_app -> {
Toast.makeText(this@MainActivity,"About Section Clicked",Toast.LENGTH_LONG)
}
R.id.favourites -> {
Toast.makeText(this@MainActivity,"Favourites Clicked",Toast.LENGTH_LONG)
}
}
return@setNavigationItemSelectedListener true
}
}
fun setUpToolbar() {
setSupportActionBar(toolbar)
supportActionBar?.title = "Toolbar Title"
supportActionBar?.setHomeButtonEnabled(true)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
val id = item.itemId
if(id == android.R.id.home){
drawerLayout.openDrawer(GravityCompat.START )
}
return super.onOptionsItemSelected(item)
}
}
碎片文件：
package com.shivanshu.bookhub
import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"
/**
* A simple [Fragment] subclass.
* Use the [DashboardFragment.newInstance] factory method to
* create an instance of this fragment.
*/
class DashboardFragment : Fragment() {
// TODO: Rename and change types of parameters
private var param1: String? = null
private var param2: String? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
arguments?.let {
param1 = it.getString(ARG_PARAM1)
param2 = it.getString(ARG_PARAM2)
}
}
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?): View? {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_dashboard2, container, false)
}
companion object {
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment DashboardFragment.
*/
// TODO: Rename and change types and number of parameters
@JvmStatic fun newInstance(param1: String, param2: String) =
DashboardFragment().apply {
arguments = Bundle().apply {
putString(ARG_PARAM1, param1)
putString(ARG_PARAM2, param2)
}
}
}
}
我实现了具有各种菜单项的NavigationDrawer，当我点击仪表板菜单项时，它将打开我创建的仪表板片段
您应该传递DashboardFragment的一个实例来替换函数。
val dashboardFragmentInctance = DashboardFragment.newInstance("param","param")
supportFragmentManager.beginTransaction().
replace(R.id.frameLayout, dashboardFragmentInctance).commit()