File Templates. Android Studio. Kotlin. Fragment and ViewModel

01. TemplateFragment.kt

/*
How to add this template to Android Studio:
1. Settings -> Edditor -> File and Code Templated;
2. Open "Files" tab;
3. Click icon "Plus" and paste the code below;
4. "Enable Live Templates" should be turned off.
*/

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#end

import android.content.Intent
import android.content.pm.PackageManager
import android.os.Bundle
import android.view.View
import com.cdvdev.videoinventory.R
import com.mobiledevpro.commons.fragment.BaseFragment
import org.koin.androidx.scope.lifecycleScope
import org.koin.androidx.viewmodel.scope.viewModel

#parse("File Header.java") 

//BaseFragment class is a part of java library https://github.com/mobile-dev-pro/commons-ui
//See BaseFragment class here
//https://github.com/mobile-dev-pro/commons/blob/8b65335e549ce160063f33d427e69b82c15ee909/src/main/java/com/mobiledevpro/commons/fragment/BaseFragment.java

class ${FRAGMENT_NAME}Fragment : BaseFragment() {
    private val args: ${NAME}Args by navArgs()

    private val viewModel${FRAGMENT_NAME}: ${FRAGMENT_NAME}ViewModel
        by lifecycleScope.viewModel(this)

    override fun getLayoutResId() = 0 //R.layout.fragment_..... Layout with data binding

    override fun getAppBarTitle() = 0 //R.string.app_title_.....

    override fun getHomeAsUpIndicatorIcon() = R.drawable.ic_arrow_back_white_24dp

    override fun initPresenters() {
        //add lifecycle observer to presenter
        lifecycle.addObserver(viewModel${FRAGMENT_NAME})
    }

    override fun populateView(layoutView: View?, savedInstanceState: Bundle?): View {
        //databinding
        val binding = Fragment${FRAGMENT_NAME}Binding.bind(layoutView)
            .apply {
                viewModel = viewModel${FRAGMENT_NAME}
            }
        binding.lifecycleOwner = viewLifecycleOwner

        observeLiveData()

        return binding.root
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        var isGranted = false
        for (result in grantResults) {
            if (result == PackageManager.PERMISSION_GRANTED) {
                isGranted = true
            } else {
                isGranted = false
                break
            }
        }

        when (requestCode) {
            //check request codes here and do something
            
            else -> super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        when (requestCode) {
            //check request codes here and do something
 
            else -> super.onActivityResult(requestCode, resultCode, data)
        }
    }

    private fun observeLiveData() {
       //listen LiveData changes here
       
    }

}

02. TemplateViewModel.kt

/*
How to add this template to Android Studio:
1. Settings -> Edditor -> File and Code Templated;
2. Open "Files" tab;
3. Click icon "Plus" and paste the code below;
4. "Enable Live Templates" should be turned off.
*/

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#end

import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleObserver
import androidx.lifecycle.OnLifecycleEvent
import com.cdvdev.videoinventory.common.BaseViewModel

#parse("File Header.java") 

class ${NAME} : BaseViewModel(), LifecycleObserver {


    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    fun onStartView() {
        //do something on start view if it's needed
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    fun onStopView() {
        //do something on stop view if it's needed
    }
}

BaseViewModel.kt

//You should use RxJava2

abstract class BaseViewModel : ViewModel() {

    private var disposable: CompositeDisposable = CompositeDisposable()

    val subscriptions: CompositeDisposable
        get() {
            if (disposable.isDisposed) disposable = CompositeDisposable()
            return disposable
        }

    fun clearSubscriptions() {
        disposable.dispose()
    }

    override fun onCleared() {
        disposable.dispose()
    }
}