有沒有辦法解決這個故障？

Question

我在片段中包含了一個片段，它在 FAB 的幫助下進入了片段 2。

但我的應用程序出現故障。 該按鈕在 apk 和模擬器中不起作用，如圖所示，在右下角的一個小框中。

按下按鈕前的模擬器

按下按鈕后的模擬器

我的兩個片段的代碼：

片段1：

@Suppress("DEPRECATION")
class IncomeFragment: Fragment(){

private lateinit var recyclerView: RecyclerView
private lateinit var incomeViewModel: IncomeViewModel
private lateinit var mAdapter: IncomeAdapter
private lateinit var addIncomeFab: FloatingActionButton

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_income, container, false)


}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    addIncomeFab = view.findViewById(R.id.incomeFab)
    addIncomeFab.setOnClickListener {

        val addBankFragment = AddBankFragment()
        val transaction =
            fragmentManager!!.beginTransaction()
        transaction.replace(R.id.linMain, addBankFragment)
        transaction.addToBackStack(null)

        transaction.commit()
    }

    recyclerView = view.findViewById(R.id.incomeRecyclerView)
    val layoutManager: RecyclerView.LayoutManager =
        LinearLayoutManager(activity, LinearLayoutManager.VERTICAL, false)
    recyclerView.layoutManager = layoutManager
    val dividerItemDecoration = DividerItemDecoration(activity, DividerItemDecoration.VERTICAL)
    recyclerView.addItemDecoration(dividerItemDecoration)

    mAdapter = IncomeAdapter()

    recyclerView.adapter = mAdapter

    incomeViewModel = ViewModelProviders.of(this).get(IncomeViewModel::class.java)

    IncomeViewModel.getIncomeEntitiesPagedList()
        .observe(viewLifecycleOwner, Observer<PagedList<IncomeEntity>> { incomeEntities ->
            if (incomeEntities == null || incomeEntities.size == 0) {
                IncomeViewModel.getIncomeEntitiesPagedList()
            }

            if (incomeEntities.size == 0) {
                incomeRelView.visibility = View.VISIBLE
            } else {
                incomeRelView.visibility = View.INVISIBLE
            }

            mAdapter.submitList(incomeEntities)
        })
    }
}

片段2：

@Suppress("DEPRECATION")
class AddBankFragment : Fragment() {

private lateinit var editBankName: EditText
private lateinit var editBankAc: EditText
private lateinit var editBankBalance: EditText
private lateinit var fabSave: FloatingActionButton
private lateinit var bankName: String
private lateinit var bankAc: String
private lateinit var bankBalance: String
private var getBankName:String = ""
private var getBankAc:String = ""
private var getBankBalance:String = ""
private lateinit var intent: Intent


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    arguments?.let {
        //columnCount = it.getInt
    }
}

override fun onCreateView(
    inflater: LayoutInflater, container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    // Inflate the layout for this fragment
    return inflater.inflate(R.layout.fragment_add_bank, container, false)
}

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)

    editBankName = view!!.findViewById(R.id.enter_bank)
    editBankAc = view!!.findViewById(R.id.edit_bank_ac)
    editBankBalance = view!!.findViewById(R.id.edit_bank_balance)
    fabSave = view!!.findViewById(R.id.fab_save)
    editTextListener()
    getCurrentDateAndTime()

    fabSave.setOnClickListener {

        if (!TextUtils.isEmpty(editBankName.text.toString()) && !TextUtils.isEmpty(
                editBankAc.text.toString()) && !TextUtils.isEmpty(
                editBankBalance.text.toString()
            )
        ) {
            !tilEnterBankName.isErrorEnabled
            !tilEnterBankAc.isErrorEnabled
            !tilEnterBankBalance.isErrorEnabled
            bankName = editBankName.text.toString()
            bankAc = editBankAc.text.toString()
            bankBalance = editBankBalance.text.toString()


            if(Companion.id ==0)
            {
                IncomeRepository.insertBankInDb(bankName, bankAc, bankBalance )
            }
            else{
                IncomeRepository.updateBankInDb(Companion.id,bankName, bankAc, bankBalance)

            }
            getActivity()?.finish()
        }
    }
}

private fun editTextListener() {
    editBankName.addTextChangedListener(textWatcher)
    editBankAc.addTextChangedListener(textWatcher)
    editBankBalance.addTextChangedListener(textWatcher)
}

var textWatcher = object : TextWatcher {
    override fun afterTextChanged(s: Editable?) {
        //Not required to check here
    }

    override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
        //Not required to check here
    }

    override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
        validation()
    }
}

private fun validation() {
    if (TextUtils.isEmpty(editBankName.text.toString())) {
        tilEnterBankName.isErrorEnabled
        tilEnterBankName.error = getString(R.string.please_enter_bank)

    } else {
        !tilEnterBankName.isErrorEnabled
        tilEnterBankName.error = ""
    }

    if (TextUtils.isEmpty(editBankAc.text.toString())) {
        tilEnterBankAc.isErrorEnabled
        tilEnterBankAc.error = getString(R.string.please_enter_account_number)

    } else {
        !tilEnterBankAc.isErrorEnabled
        tilEnterBankAc.error = ""
    }

    if (TextUtils.isEmpty(editBankBalance.text.toString())) {
        tilEnterBankBalance.isErrorEnabled
        tilEnterBankBalance.error = getString(R.string.please_enter_account_balance)

    } else {
        !tilEnterBankBalance.isErrorEnabled
        tilEnterBankBalance.error = ""
    }
}

@SuppressLint("SimpleDateFormat")
private fun getCurrentDateAndTime(): String {
    var answer=""
    answer = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        val current = LocalDateTime.now()
        val formatter = DateTimeFormatter.ofPattern("dd.MM.yyyy. HH:mm:ss")
        current.format(formatter)
    } else {
        val date = Date()
        val formatter = SimpleDateFormat("MMM dd yyyy HH:mma")
        formatter.format(date)
    }
    return answer
}

MainActivity 的代碼

class MainActivity : AppCompatActivity() {

private lateinit var incomeBtn: ImageButton
private lateinit var dashboardBtn: ImageButton
private lateinit var expenseBtn: ImageButton


private lateinit var mViewPager: ViewPager
private lateinit var mPagerViewAdapter: PagerViewAdapter


override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    //adding Fragment
    val incomeFragment = IncomeFragment()
    val fm: FragmentManager = supportFragmentManager

    fm.beginTransaction().add(R.id.linMain, incomeFragment).commit()


    mViewPager = findViewById(R.id.mViewPager)
    incomeBtn = findViewById(R.id.income_btn)
    dashboardBtn = findViewById(R.id.dashboard_btn)
    expenseBtn = findViewById(R.id.expense_btn)



    //onclick listener

    incomeBtn.setOnClickListener {
        mViewPager.currentItem = 0

    }

    dashboardBtn.setOnClickListener {

        mViewPager.currentItem = 1
    }

    expenseBtn.setOnClickListener {
        mViewPager.currentItem = 2
    }

    mPagerViewAdapter = PagerViewAdapter(supportFragmentManager)
    mViewPager.adapter = mPagerViewAdapter
    mViewPager.offscreenPageLimit = 3

    //add Page listener
    mViewPager.addOnPageChangeListener(object : ViewPager.OnPageChangeListener {
        override fun onPageScrolled(
            position: Int,
            positionOffset: Float,
            positionOffsetPixels: Int
        ){

        }
        override fun onPageSelected(position: Int) {
            changeTabs(position)
        }

        override fun onPageScrollStateChanged(state: Int) {}
    })

    mViewPager.currentItem = 0
    dashboardBtn.setImageResource(R.drawable.ic_baseline_dashboard_blue)
}

private fun changeTabs(position: Int) {

    if (position == 0) {
        incomeBtn.setImageResource(R.drawable.ic_baseline_add_blue)
        dashboardBtn.setImageResource(R.drawable.ic_baseline_dashboard_24)
        expenseBtn.setImageResource(R.drawable.ic_baseline_minimize_24)
    }

    if (position == 1) {
        incomeBtn.setImageResource(R.drawable.ic_baseline_add_24)
        dashboardBtn.setImageResource(R.drawable.ic_baseline_dashboard_blue)
        expenseBtn.setImageResource(R.drawable.ic_baseline_minimize_24)
    }

    if (position == 2) {
        incomeBtn.setImageResource(R.drawable.ic_baseline_add_24)
        dashboardBtn.setImageResource(R.drawable.ic_baseline_dashboard_24)
        expenseBtn.setImageResource(R.drawable.ic_baseline_minimize_blue)
    }
}
}

Answer 1

在MainActivity中打開您的代碼：

   fm.beginTransaction().add(R.id.linMain, incomeFragment).commit()

至

   fm.beginTransaction().replace(R.id.linMain, incomeFragment).commit()

並更改每個add function 調用以replace您的代碼。