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| <?xml version="1.0" encoding="utf-8"?> | |
| <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
| xmlns:app="http://schemas.android.com/apk/res-auto" | |
| xmlns:tools="http://schemas.android.com/tools" | |
| android:layout_width="match_parent" | |
| android:layout_height="match_parent" | |
| tools:context=".MainActivity"> | |
| <androidx.recyclerview.widget.RecyclerView | |
| android:id="@+id/rvTodoItems" | |
| android:layout_width="match_parent" | |
| android:layout_height="0dp" | |
| app:layout_constraintBottom_toTopOf="@+id/btnAddTodo" | |
| app:layout_constraintEnd_toEndOf="parent" | |
| app:layout_constraintStart_toStartOf="parent" | |
| app:layout_constraintTop_toTopOf="parent" /> | |
| <EditText | |
| android:id="@+id/etTodoTitle" | |
| android:layout_width="0dp" | |
| android:layout_height="wrap_content" | |
| android:hint="Enter Todo Title" | |
| app:layout_constraintBottom_toBottomOf="parent" | |
| app:layout_constraintEnd_toStartOf="@+id/btnAddTodo" | |
| app:layout_constraintStart_toStartOf="parent" /> | |
| <Button | |
| android:id="@+id/btnAddTodo" | |
| android:layout_width="wrap_content" | |
| android:layout_height="wrap_content" | |
| android:text="Add Todo" | |
| app:layout_constraintBottom_toBottomOf="parent" | |
| app:layout_constraintEnd_toStartOf="@+id/btnDeleteDoneTodo" /> | |
| <Button | |
| android:id="@+id/btnDeleteDoneTodo" | |
| android:layout_width="wrap_content" | |
| android:layout_height="wrap_content" | |
| android:text="Delete Done" | |
| app:layout_constraintBottom_toBottomOf="parent" | |
| app:layout_constraintEnd_toEndOf="parent" /> | |
| </androidx.constraintlayout.widget.ConstraintLayout> |
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| plugins { | |
| id 'com.android.application' | |
| id 'kotlin-android' | |
| id 'kotlin-android-extensions' | |
| } | |
| android { | |
| compileSdkVersion 30 | |
| buildToolsVersion "30.0.3" | |
| defaultConfig { | |
| applicationId "com.example.todolist" | |
| minSdkVersion 21 | |
| targetSdkVersion 30 | |
| versionCode 1 | |
| versionName "1.0" | |
| testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" | |
| } | |
| buildTypes { | |
| release { | |
| minifyEnabled false | |
| proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' | |
| } | |
| } | |
| compileOptions { | |
| sourceCompatibility JavaVersion.VERSION_1_8 | |
| targetCompatibility JavaVersion.VERSION_1_8 | |
| } | |
| kotlinOptions { | |
| jvmTarget = '1.8' | |
| } | |
| } | |
| dependencies { | |
| implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" | |
| implementation 'androidx.core:core-ktx:1.3.1' | |
| implementation 'androidx.appcompat:appcompat:1.2.0' | |
| implementation 'com.google.android.material:material:1.2.1' | |
| implementation 'androidx.constraintlayout:constraintlayout:2.0.1' | |
| testImplementation 'junit:junit:4.+' | |
| androidTestImplementation 'androidx.test.ext:junit:1.1.2' | |
| androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0' | |
| implementation 'com.google.android.material:material:1.3.0-alpha02' | |
| } |
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| <?xml version="1.0" encoding="utf-8"?> | |
| <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" | |
| xmlns:app="http://schemas.android.com/apk/res-auto" | |
| android:layout_width="match_parent" | |
| android:layout_height="80dp" | |
| android:paddingStart="8dp" | |
| android:paddingEnd="8dp"> | |
| <TextView | |
| android:id="@+id/tvTodoTitle" | |
| android:layout_width="0dp" | |
| android:layout_height="wrap_content" | |
| android:text="Example" | |
| android:textSize="24sp" | |
| app:layout_constraintBottom_toBottomOf="parent" | |
| app:layout_constraintEnd_toStartOf="@+id/cbDone" | |
| app:layout_constraintStart_toStartOf="parent" | |
| app:layout_constraintTop_toTopOf="parent" /> | |
| <CheckBox | |
| android:id="@+id/cbDone" | |
| android:layout_width="wrap_content" | |
| android:layout_height="wrap_content" | |
| app:layout_constraintBottom_toBottomOf="parent" | |
| app:layout_constraintEnd_toEndOf="parent" | |
| app:layout_constraintTop_toTopOf="parent" /> | |
| </androidx.constraintlayout.widget.ConstraintLayout> |
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| package com.example.todolist | |
| import androidx.appcompat.app.AppCompatActivity | |
| import android.os.Bundle | |
| import androidx.recyclerview.widget.LinearLayoutManager | |
| import kotlinx.android.synthetic.main.activity_main.* | |
| class MainActivity : AppCompatActivity() { | |
| private lateinit var todoAdapter : TodoAdapter | |
| override fun onCreate(savedInstanceState: Bundle?) { | |
| super.onCreate(savedInstanceState) | |
| setContentView(R.layout.activity_main) | |
| todoAdapter = TodoAdapter(mutableListOf()) | |
| rvTodoItems.adapter = todoAdapter | |
| rvTodoItems.layoutManager = LinearLayoutManager(this) | |
| btnAddTodo.setOnClickListener { | |
| val todoTitle = etTodoTitle.text.toString() | |
| if(todoTitle.isNotEmpty()) { | |
| val todo = Todo(todoTitle) | |
| todoAdapter.addTodo(todo) | |
| etTodoTitle.text.clear() | |
| } | |
| } | |
| btnDeleteDoneTodo.setOnClickListener { | |
| todoAdapter.deleteDoneTodos() | |
| } | |
| } | |
| } |
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| package com.example.todolist | |
| data class Todo ( | |
| val title: String, | |
| var isChecked: Boolean = false | |
| ) |
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| package com.example.todolist | |
| import android.graphics.Paint.STRIKE_THRU_TEXT_FLAG | |
| import android.view.LayoutInflater | |
| import android.view.View | |
| import android.view.ViewGroup | |
| import android.widget.TextView | |
| import androidx.recyclerview.widget.RecyclerView | |
| import kotlinx.android.synthetic.main.activity_main.view.* | |
| import kotlinx.android.synthetic.main.item_todo.view.* | |
| class TodoAdapter( | |
| private val todos: MutableList<Todo> | |
| ) : RecyclerView.Adapter<TodoAdapter.TodoViewHolder>() { | |
| class TodoViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) | |
| override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): TodoViewHolder { | |
| return TodoViewHolder( | |
| LayoutInflater.from(parent.context).inflate( | |
| R.layout.item_todo, | |
| parent, | |
| false | |
| ) | |
| ) | |
| } | |
| private fun toggleStrikeThrough(tvTodoTitle: TextView, isChecked: Boolean) { | |
| if(isChecked) { | |
| tvTodoTitle.paintFlags = tvTodoTitle.paintFlags or STRIKE_THRU_TEXT_FLAG | |
| } else { | |
| tvTodoTitle.paintFlags = tvTodoTitle.paintFlags and STRIKE_THRU_TEXT_FLAG.inv() | |
| } | |
| } | |
| fun addTodo(todo: Todo) { | |
| todos.add(todo) | |
| notifyItemInserted(todos.size -1) | |
| } | |
| fun deleteDoneTodos() { | |
| todos.removeAll { todo -> | |
| todo.isChecked | |
| } | |
| notifyDataSetChanged() | |
| } | |
| override fun onBindViewHolder(holder: TodoViewHolder, position: Int) { | |
| val curTodo = todos[position] | |
| holder.itemView.apply { | |
| tvTodoTitle.text = curTodo.title | |
| cbDone.isChecked = curTodo.isChecked | |
| toggleStrikeThrough(tvTodoTitle, curTodo.isChecked) | |
| cbDone.setOnCheckedChangeListener { _, isChecked -> | |
| toggleStrikeThrough(tvTodoTitle, isChecked) | |
| curTodo.isChecked = !curTodo.isChecked | |
| } | |
| } | |
| } | |
| override fun getItemCount(): Int { | |
| return todos.size | |
| } | |
| } |
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