[코틀린] Base 코드 관련 정리 (feat. BaseActivity, BaseFragment)

[2021-04-13 업데이트]

 

BaseActivity 같은 것을 만들고 이것을 액티비티에서 상속받아 쓰면 여러모로 편리한 점이 많다. (중복 코드 제거 및 깔끔해짐 등등 )

 

이것에 대해 기록용 포스팅을 남깁니다.

 

 

BaseActivity

package com.mtjin.nomoneytrip.base

import android.os.Bundle
import android.widget.Toast
import androidx.annotation.LayoutRes
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import androidx.databinding.ViewDataBinding
import io.reactivex.disposables.CompositeDisposable

abstract class BaseActivity<B : ViewDataBinding>(
    @LayoutRes val layoutId: Int
) : AppCompatActivity() {
    lateinit var binding: B
    private val compositeDisposable = CompositeDisposable()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, layoutId)
        binding.lifecycleOwner = this
    }

    protected fun showToast(msg: String) {
        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show()
    }

    override fun onDestroy() {
        super.onDestroy()
        compositeDisposable.clear()
    }
}

class MainActivity : BaseActivity<ActivityMainBinding>(
    R.layout.activity_main
) {

 

 

 

 

BaseViewModel

package com.mtjin.nomoneytrip.base

import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import io.reactivex.disposables.CompositeDisposable

abstract class BaseViewModel : ViewModel() {
    protected val compositeDisposable = CompositeDisposable()

    private val _isLoading = MutableLiveData<Boolean>(false)
    val isLoading: LiveData<Boolean> get() = _isLoading

    override fun onCleared() {
        compositeDisposable.dispose()
        super.onCleared()
    }

    protected fun showProgress() {
        _isLoading.value = true
    }

    protected fun hideProgress() {
        _isLoading.value = false
    }
}

 

 

 

BaseFragment (세가지종류)

package com.mtjin.nomoneytrip.base

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.annotation.LayoutRes
import androidx.databinding.DataBindingUtil
import androidx.databinding.ViewDataBinding
import androidx.fragment.app.Fragment

abstract class BaseFragment<B : ViewDataBinding>(
    @LayoutRes val layoutId: Int
) : Fragment() {
    lateinit var binding: B

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = DataBindingUtil.inflate(inflater, layoutId, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.lifecycleOwner = this
        init()
    }

    abstract fun init()

    protected fun showToast(msg: String) =
        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show()
}

 

package com.mtjin.cnunoticeapp.base

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Toast
import androidx.annotation.LayoutRes
import androidx.databinding.DataBindingUtil
import androidx.databinding.ViewDataBinding
import androidx.fragment.app.Fragment

abstract class BaseFragment<B : ViewDataBinding, VM : BaseViewModel>(
    @LayoutRes val layoutId: Int
) : Fragment() {
    protected lateinit var binding: B
    protected abstract val viewModel: VM

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = DataBindingUtil.inflate(inflater, layoutId, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.lifecycleOwner = this
        init()
    }

    abstract fun init()

    protected fun showToast(msg: String) =
        Toast.makeText(context, msg, Toast.LENGTH_SHORT).show()
}

abstract class BaseFragment<VM : ViewModel, B : ViewDataBinding>(
    viewModelClass: KClass<VM>,
    @LayoutRes val layoutResId: Int
) : DaggerFragment() {

    @Inject
    lateinit var analytics: EventAnalytics

    @Inject
    lateinit var viewModelFactory: ViewModelProvider.Factory

    protected val viewModel: VM by viewModel(viewModelClass) { viewModelFactory }

    protected lateinit var binding: B

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = DataBindingUtil.inflate(inflater, layoutResId, container, false)
        with(binding) {
            setVariable(BR.viewModel, viewModel)
            lifecycleOwner = viewLifecycleOwner
        }
        return binding.root
    }
}

 

 

댓글과 공감은 큰 힘이 됩니다. 감사합니다. !!