Reducing complexity & duplication

Author: Melih Aksoy

core/src/main/kotlin/com/melih/core/base/lifecycle/BaseFragment.kt

@@ -10,6 +10,9 @@ import androidx.databinding.ViewDataBinding
 import androidx.fragment.app.Fragment
 import androidx.navigation.NavController
 import androidx.navigation.fragment.NavHostFragment
+import com.google.android.material.snackbar.Snackbar
+import com.melih.repository.interactors.base.Reason
+import kotlinx.coroutines.ExperimentalCoroutinesApi
 
 /**
  * Parent of all fragments.
@@ -38,6 +41,17 @@ abstract class BaseFragment<T : ViewDataBinding> : Fragment() {
         return binding.root
     }
 
+    @ExperimentalCoroutinesApi
+    protected fun showSnackbarWithAction(reason: Reason, block: () -> Unit) {
+        Snackbar.make(
+            binding.root,
+            resources.getString(reason.messageRes),
+            Snackbar.LENGTH_INDEFINITE
+        ).setAction(com.melih.core.R.string.retry) {
+            block()
+        }.show()
+    }
+
     @LayoutRes
     abstract fun getLayoutId(): Int
     // endregion

core/src/main/kotlin/com/melih/core/extensions/UtilityExtension.kt

@@ -0,0 +1,3 @@
+package com.melih.core.extensions
+
+fun CharSequence.containsIgnoreCase(other: CharSequence) = contains(other, true)

features/detail/src/main/kotlin/com/melih/detail/ui/DetailFragment.kt

@@ -4,7 +4,6 @@ import android.os.Bundle
 import android.text.method.ScrollingMovementMethod
 import android.view.View
 import androidx.navigation.fragment.navArgs
-import com.google.android.material.snackbar.Snackbar
 import com.melih.core.base.lifecycle.BaseDaggerFragment
 import com.melih.core.extensions.createFor
 import com.melih.core.extensions.observe
@@ -43,13 +42,9 @@ class DetailFragment : BaseDaggerFragment<DetailBinding>() {
 
         // Observing error to show toast with retry action
         observe(viewModel.errorData) {
-            Snackbar.make(
-                binding.root,
-                resources.getString(it.messageRes),
-                Snackbar.LENGTH_INDEFINITE
-            ).setAction(com.melih.core.R.string.retry) {
+            showSnackbarWithAction(it) {
                 viewModel.retry()
-            }.show()
+            }
         }
 
         observe(viewModel.successData) {

features/list/src/main/kotlin/com/melih/list/ui/LaunchesFragment.kt

@@ -6,17 +6,16 @@ import android.view.MenuInflater
 import android.view.View
 import androidx.appcompat.widget.SearchView
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
-import com.google.android.material.snackbar.Snackbar
 import com.melih.core.actions.Actions
 import com.melih.core.base.lifecycle.BaseDaggerFragment
+import com.melih.core.extensions.containsIgnoreCase
 import com.melih.core.extensions.createFor
 import com.melih.core.extensions.observe
 import com.melih.list.R
 import com.melih.list.databinding.ListBinding
 import com.melih.repository.entities.LaunchEntity
 import com.melih.repository.interactors.base.Result
 import kotlinx.coroutines.ExperimentalCoroutinesApi
-import timber.log.Timber
 
 class LaunchesFragment : BaseDaggerFragment<ListBinding>(), SwipeRefreshLayout.OnRefreshListener {
 
@@ -40,20 +39,43 @@ class LaunchesFragment : BaseDaggerFragment<ListBinding>(), SwipeRefreshLayout.O
         binding.rocketList.adapter = launchesAdapter
         binding.swipeRefreshLayout.setOnRefreshListener(this)
 
+        observeDataChanges()
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
+        inflater.inflate(R.menu.menu_rocket_list, menu)
+
+        (menu.findItem(R.id.search).actionView as SearchView).apply {
+            setOnQueryTextListener(object : SearchView.OnQueryTextListener {
+
+                override fun onQueryTextSubmit(query: String?): Boolean {
+                    clearFocus()
+                    return true
+                }
+
+                override fun onQueryTextChange(newText: String?): Boolean {
+                    launchesAdapter.submitList(filterItemListBy(newText))
+                    return true
+                }
+            })
+        }
+
+        super.onCreateOptionsMenu(menu, inflater)
+    }
+
+    @ExperimentalCoroutinesApi
+    private fun observeDataChanges() {
+
         // Observing state to show loading
         observe(viewModel.stateData) {
             binding.swipeRefreshLayout.isRefreshing = it is Result.State.Loading
         }
 
         // Observing error to show toast with retry action
         observe(viewModel.errorData) {
-            Snackbar.make(
-                binding.root,
-                resources.getString(it.messageRes),
-                Snackbar.LENGTH_INDEFINITE
-            ).setAction(com.melih.core.R.string.retry) {
+            showSnackbarWithAction(it) {
                 viewModel.retry()
-            }.show()
+            }
         }
 
         observe(viewModel.successData) {
@@ -64,46 +86,18 @@ class LaunchesFragment : BaseDaggerFragment<ListBinding>(), SwipeRefreshLayout.O
     }
 
     private fun onItemSelected(item: LaunchEntity) {
-        Timber.i("${item.id}")
         startActivity(Actions.openDetailFor(item.id))
     }
 
-    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
-        inflater.inflate(R.menu.menu_rocket_list, menu)
-
-        (menu.findItem(R.id.search).actionView as SearchView).apply {
-            setOnQueryTextListener(object : SearchView.OnQueryTextListener {
-
-                override fun onQueryTextSubmit(query: String?): Boolean {
-                    clearFocus()
-                    return true
-                }
-
-                override fun onQueryTextChange(newText: String?): Boolean {
-                    launchesAdapter.submitList(
-                        if (!newText.isNullOrBlank()) {
-                            itemList.filter {
-                                it.rocket.name.contains(
-                                    newText,
-                                    true
-                                ) || (it.missions.size > 0 && it.missions[0].description.contains(
-                                    newText,
-                                    true
-                                ))
-                            }
-                        } else {
-                            itemList
-                        }
-                    )
-
-                    return true
-                }
-            })
+    private fun filterItemListBy(query: String?) =
+        if (!query.isNullOrBlank()) {
+            itemList.filter {
+                it.rocket.name.containsIgnoreCase(query) || it.missions.any { it.description.containsIgnoreCase(query) }
+            }
+        } else {
+            itemList
         }
 
-        super.onCreateOptionsMenu(menu, inflater)
-    }
-
     @ExperimentalCoroutinesApi
     override fun onRefresh() {
         viewModel.refresh()