我在“所有用户”片段中都有一个列表。单击列表上的名称时,应切换到“用户详细信息”片段。我似乎找不到办法以某种方式销毁此碎片并提出新的碎片,或者只是在旧的碎片上显示新的碎片。
使用的语言是Kotlin。我是新来的。我用Fragment Manager尝试了一些方法,但似乎找不到正确的语法。
主要活动.kt
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//Default view when app starts
title = resources.getString(R.string.allusers)
loadFragment(AllUsersFragment())
//Bottom Navigation Bar
navigationView.setOnNavigationItemSelectedListener {
when (it.itemId) {
R.id.navigation_allusers -> {
title = resources.getString(R.string.allusers)
loadFragment(AllUsersFragment())
return@setOnNavigationItemSelectedListener true
}
R.id.navigation_transfer -> {
title = resources.getString(R.string.transfer)
loadFragment(TransferFragment())
return@setOnNavigationItemSelectedListener true
}
R.id.navigation_logs -> {
title = resources.getString(R.string.logs)
loadFragment(LogsFragment())
return@setOnNavigationItemSelectedListener true
}
}
false
}
}
//function to load fragment when bottom navigation is clicked
fun loadFragment(fragment: Fragment) {
val transaction = supportFragmentManager.beginTransaction()
transaction.replace(R.id.container, fragment)
transaction.addToBackStack(null)
transaction.commit()
}
}
AllUsersFragment.kt
class AllUsersFragment : Fragment(){
private lateinit var listView:ListView
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val rootView = inflater.inflate(R.layout.fragment_allusers, container, false)
val details = UserDetailsFragment()
val bundle = Bundle() //To transfer information
listView = rootView.findViewById(R.id.usersList)
val userNames = arrayOf(
"Andrew Jackson",
"Barry Alan",
"Caitlyn Snow",
"Drake Ramoray"
)
val adapter = ArrayAdapter(context, android.R.layout.simple_list_item_1, userNames)
listView.adapter = adapter
//List view item clicked listener
listView.onItemClickListener = AdapterView.OnItemClickListener { adapterView, view, i, l ->
val userName = userNames[i]
bundle.putString("str", userName)
bundle.putInt("int", i)
details.arguments = bundle
}
return rootView
}
}
UserDetails.kt
class UserDetailsFragment : Fragment(){
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val rootView = inflater.inflate(R.layout.fragment_user_details,container,false)
val nameField = rootView.findViewById<TextView>(R.id.nameField)
val imageField = rootView.findViewById<ImageView>(R.id.imageField)
//Importing images
val andrewjackson = BitmapFactory.decodeResource(context!!.resources,R.drawable.andrewjackson)
val barryalan = BitmapFactory.decodeResource(context!!.resources,R.drawable.barryalan)
val caitlynsnow = BitmapFactory.decodeResource(context!!.resources,R.drawable.caitlynsnow)
val drakeramoray = BitmapFactory.decodeResource(context!!.resources,R.drawable.drakeramoray)
val userImages = ArrayList<Bitmap>()
userImages.add(andrewjackson)
userImages.add(barryalan)
userImages.add(caitlynsnow)
userImages.add(drakeramoray)
val name = arguments!!.getString("str") //Displays name clicked on Details Page
nameField.setText(name)
val i =arguments!!.getInt("int") //Displays image of user from array
imageField.setImageBitmap(userImages[i])
return rootView
}
}
我认为可以在loadFragment
中使用MainActivity.kt
函数,但是我想不出一种在片段中使用该函数的方法。
预期输出:
单击列表上的名称后,它应更改为同一容器中的另一个片段,以显示用户详细信息。
答案 0 :(得分:2)
您可以在片段中使用此代码替换容器中的片段
val someFragment = YourUserDetailsFragment()
val transaction = fragmentManager!!.beginTransaction()
transaction.replace(R.id.container, someFragment)
transaction.addToBackStack(null)
transaction.commit()
答案 1 :(得分:1)
是的,有两种方法可以使用Interface和public方法。由于片段与活动绑定,这意味着活动是父项。
因此,您可以使用
来访问仅用于使公共不活动和访问的方法。(activity as MainActivity).loadFragment(//Your fragment intance)
Here是在活动和片段之间进行通信的示例。
答案 2 :(得分:1)
您已经完成了所有设置,在点击监听器中,您只需致电activity?.loadFragment(UserDetailsFragment())
listView.onItemClickListener = AdapterView.OnItemClickListener { adapterView, view, i, l ->
val userName = userNames[i]
bundle.putString("str", userName)
bundle.putInt("int", i)
details.arguments = bundle
(activity as MainActivity)?.loadFragment(details)
}