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Android Recyclerview Kotlin Library, Gencycler a Boilerplate free RecyclerView adapter. Gencycler uses annotation processing to analyze your code and generates the Recyclerview adapter for you, which means you only need to worry about your logic and not about the adapter. For Java Code click here Author Gil Goldzweig (gilgoldzweig) Link https://github.com/gilgoldzweig/gencycler Min SDK 14 (Android 4.0–4.0.2 Ice Cream Sandwich) Version 2.1.0 (Jan 5, 2019) Lisence MIT License Written in Kotlin <3, for Kotlin and JavaGenerates human readable code(plus comments, minus the human errors)Clean and optimized code – Generates only what is requiredClick / Long-Click listenersMulti view typesExpandable itemsSwipe to deleteHeadersFootersSimple Drag and dropFilterEasily extensibleCustom variable namingParses your layout file so no more findViewByIdComes with useful HelpersNo runtime cost – everything happens at compile-timeMulti flavor supportButterknife R2 support Gencycler works in compile time so no runtime performance impact Gencycler will generated a readable multi view type RecyclerView Adapter with a thread-safe accessing mechanism. It eliminates the need to write all of the boilerplate code needed for writing an adapter and leaves you with only the bare minimum needed to write your business logic. Implement in your project Using maven Kotlin apply plugin: 'kotlin-kapt' repositories { maven { url "https://jitpack.io" } } dependencies { implementation 'com.github.gilgoldzweig.Gencycler:gencycler:latest_version' kapt 'com.github.gilgoldzweig.Gencycler:compiler:latest_version' } How to use 1. Implement your model Just create a class which implements the GencyclerModel and annotate it with @GencyclerViewHolder Each class represents a ViewHolder & Data model. In order to associate the class with a layout we place the layout id of what the item should look like inside the annotation as shown below. Kotlin @GencyclerViewHolder(R.layout.item_simple) data class SimpleModel(val name: String, val description: String) : GencyclerModel 2. Implement your adapter Just create a class and annotate it with @GencyclerAdapter place every model you want the adapter to use inside the annotation as shown below. Kotlin – Single view type @GencyclerAdapter(SimpleModel::class) class SimpleAdapter Kotlin – Mutli view type @GencyclerAdapter(SimpleModel::class, AnotherModel::class) //for multiple view types just seperated each model by a comma class SimpleAdapter 3. Compile Compile your project and when the compilation finishes your adapters and view holders will be generated. The generated adapter will be named Generated + Your adapter class name and will be an abstract class with a bind function for every model you provided The ViewHolder we be Generated and implemented automatically 4. Implementing the generated adapter Now that we have the generated code all we need to do is implement it The generated adapter will require 3 parameters context: Context | Used to inflate the layout of the ViewHolder elements: MutableList with the type of the provided model or GencyclerModel when multiple models wer’e provided. Default: ArrayList() | Each element represents a Generated ViewHolder updateUi: Boolean Default: true The generated adapter comes with many helper methods (add, remove, etc…) each action will update the elements in the adapter but if updateUi is True the adapter will also run a UI Thread check and call the appropriate notify method of the adapter (notifyItemInserted, notifyItemRemoved, etc…) whenever one of those function is called And a onBind abstract function The complete adapter will look like this Kotlin @GencyclerAdapter(SimpleModel::class) class SimpleAdapter(context: Context, elements: ArrayList ) : GeneratedSimpleAdapter(context, elements) { override fun onBindSimpleModelViewHolder( simpleModelViewHolder: SimpleModelViewHolder, //Generated ViewHolder, all the views from your layout are here simpleModel: SimpleModel, position: Int) { //Your logic here } } Advance/Extras Custom naming Gencycler provides renaming options to the adapter and the variables inside the ViewHolder Adapter By default the generated adapter will be named Generated + Your adapter name but you can select a custom name for your adapter by specifying it inside the @GencyclerAdapter as shown below Kotlin @GencyclerAdapter(SimpleModel::class, customName "CustomNameAdapter") class SimpleAdapter Variables By default the processor turns the id of every view in the xml layout to variable name and converts it to lower camel-case You can change the names of the variables by specifying a naming adapter inside the @GencyclerViewHolder as shown below Kotlin @GencyclerViewHolder(R.layout.item_simple, NamingCase.NAMING_CASE_SNAKE) data class SimpleModel(val name: String, val description: String) : GencyclerModel You can choose between the following enum class NamingCase { NAMING_CASE_NONE, NAMING_CASE_CAMEL, //Default NAMING_CASE_SNAKE } Event listeners For now Genecycler supports two listeners but if you want to create one for yourself just create and send pull request Click / Long Click 1. Annotate your adapter with @Clickable or @LongClickable To add listeners for item click all you need to do is annotate your adapter with @Clickable or @LongClickable (You can both at the same time) as shown below Kotlin @GencyclerAdapter(SimpleModel::class) @Clickable @LongClickable class SimpleAdapter 2. Compile Once the compilation completes an interface will be added to the generated adapter constructor OnItemClickedListener for @ClickableOnItemLongClickedListener for @LongClickable T a generic type Your model for single type GencyclerModel for multi view types Simple gestures(Drag and Drop, Swipe to delete) Create a new SimpleGesturesHelper and provide it your generated adapter Kotlin val gesturesHelper SimpleGesturesHelper(adapter) gesturesHelper.setSwipeEnabled(enabled: Boolean, vararg directions: Int) //ItemTouchHelper.START or ItemTouchHelper.END gesturesHelper.setDragAndDropEnabled(enabled: Boolean, longPressOnly: Boolean false) gesturesHelper.attachToRecyclerView(recyclerView) Filter Gencycler provides you with a way to filter your items in order to that you need to do the following 1. Annotate your adapter with @Filterable Kotlin @GencyclerAdapter(SimpleModel::class) @Filterable class SimpleAdapter 2. Compile 3. Implement the performFilter method Kotlin @GencyclerAdapter(SimpleModel::class) @Filterable class SimpleAdapter(context: Context, elements: ArrayList ) : GeneratedSimpleAdapter(context, elements) { //other methods override fun performFilter(constraint: CharSequence, simpleModel: SimpleModel): Boolean { //return true if the item should be retained and false if the item should be removed. } } To filter the items, inside your Activity/Fragment call Call this in onQueryTextSubmit() & onQueryTextChange() when using SearchView Kotlin adapter.filter("yourSearchTerm") Custom view recycling Gencycler generates functions for binding and recycling of ViewHolders The amount of functions will be the same for binding and recycling functions Binding function are abstract because the system does not provide a default option Recycling on the other hand do have a default option which you should edit in order to improve performance The generated functions look as shown below Kotlin override fun onRecycledSimpleModelViewHolder(simpleModelViewHolder: SimpleModelViewHolder, position: Int) { super.onRecycledSimpleModelViewHolder(simpleModelViewHolder, position) //remove this line //apply your custom recycleing logic } Miscellaneous(Optional) Gencycler supports number of custom options regarding customized build/flavors All of the option are inputed as shown below android { //your project configuration defaultConfig { //your project default config //Add this section javaCompileOptions { annotationProcessorOptions { arguments [ "androidManifestFile": Providing specific file path to the manifest "rClassPackage": Providing R class package - Just like when you do import but with the .R at the end (example: com.example.app.R com.example.app) "androidUseR2": true / false if you want to use Butterknife's R2 instead of R "resourcesFolder": In case you use multi flavor layouts you need to use getCurrentFlavor() ] } } } } This only applies if you have duplicate layouts for multi flavors here is a function to get the current flavor Add the following function to your gradle file def getCurrentFlavor() { Gradle gradle getGradle() Pattern pattern; String taskRequest gradle.getStartParameter().getTaskRequests().toString() if (taskRequest.contains("assemble")) { pattern Pattern.compile("assemble(\\w+)(Release|Debug)") } else { pattern Pattern.compile("generate(\\w+)(Release|Debug)") } Matcher matcher pattern.matcher(taskRequest) if (matcher.find()) { return matcher.group(1).toLowerCase() } else { println "NO MATCH FOUND" return ""; } } License MIT License Copyright (c) 2018 Gil Goldzweig Goldbaum Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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Android Recyclerview Kotlin Library Gencycler

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