Sw-spec/2048

Layout

res/drawable/cell_back.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" >
    <solid android:color="@android:color/white" />
    <stroke android:width="1dip" android:color="#707070"/>
</shape>

activity_main.xml

    <TextView
        android:id="@+id/cell00"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell01"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell01"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell02"
        app:layout_constraintLeft_toRightOf="@id/cell00"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell02"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell03"
        app:layout_constraintLeft_toRightOf="@id/cell01"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell03"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintLeft_toRightOf="@id/cell02"
        android:gravity="center"
        android:text="2048"/>

    <TextView
        android:id="@+id/cell10"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell11"
        app:layout_constraintTop_toBottomOf="@id/cell00"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell11"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell12"
        app:layout_constraintLeft_toRightOf="@id/cell10"
        app:layout_constraintTop_toBottomOf="@id/cell00"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell12"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell13"
        app:layout_constraintLeft_toRightOf="@id/cell11"
        app:layout_constraintTop_toBottomOf="@id/cell00"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell13"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintLeft_toRightOf="@id/cell12"
        app:layout_constraintTop_toBottomOf="@id/cell00"
        android:gravity="center"
        android:text="2048"/>

    <TextView
        android:id="@+id/cell20"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell21"
        app:layout_constraintTop_toBottomOf="@id/cell10"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell21"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell22"
        app:layout_constraintLeft_toRightOf="@id/cell20"
        app:layout_constraintTop_toBottomOf="@id/cell10"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell22"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell23"
        app:layout_constraintLeft_toRightOf="@id/cell21"
        app:layout_constraintTop_toBottomOf="@id/cell10"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell23"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintLeft_toRightOf="@id/cell22"
        app:layout_constraintTop_toBottomOf="@id/cell10"
        android:gravity="center"
        android:text="2048"/>

    <TextView
        android:id="@+id/cell30"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell31"
        app:layout_constraintTop_toBottomOf="@id/cell20"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell31"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell32"
        app:layout_constraintLeft_toRightOf="@id/cell30"
        app:layout_constraintTop_toBottomOf="@id/cell20"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell32"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintRight_toLeftOf="@id/cell33"
        app:layout_constraintLeft_toRightOf="@id/cell31"
        app:layout_constraintTop_toBottomOf="@id/cell20"
        android:gravity="center"
        android:text="2048"/>
    <TextView
        android:id="@+id/cell33"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:minWidth="70dp"
        android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"
        app:layout_constraintDimensionRatio="1:1"
        android:background="@drawable/cell_back"
        app:layout_constraintLeft_toRightOf="@id/cell32"
        app:layout_constraintTop_toBottomOf="@id/cell20"
        android:gravity="center"
        android:text="2048"/>

    <Button
        android:id="@+id/restartButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/cell33"
        android:text="Restart"/>

    <Button
        android:id="@+id/leftButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/restartButton"
        android:text="Left"/>
    <Button
        android:id="@+id/upButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/restartButton"
        app:layout_constraintLeft_toRightOf="@id/leftButton"
        android:text="Up"/>
    <Button
        android:id="@+id/downButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/restartButton"
        app:layout_constraintLeft_toRightOf="@id/upButton"
        android:text="Down"/>
    <Button
        android:id="@+id/rightButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/restartButton"
        app:layout_constraintLeft_toRightOf="@id/downButton"
        android:text="Right"/>

GameBoard

GameBoard.kt

class GameBoard {
    var values = Array(4,{IntArray(4)})

    companion object {
        val DIR_UP = 1
        val DIR_RIGHT = 2
        val DIR_DOWN = 3
        val DIR_LEFT = 4
    }

    fun reset() {
    }

    fun randomAdd() {
    }

    fun slide(dir: Int) {
    }
}

GameBoardViewHolder

Put this inside MainActivity.kt

    class GameBoardViewHolder(activity: Activity) {
        val views: Array<Array<TextView?>> = Array(4, {
            arrayOf<TextView?>(null,null,null,null)
        })
        lateinit var gameBoard: GameBoard

        init {
            for(r in 0..3) {
                for(c in 0..3) {
                    val cellId = "cell${r}${c}"
                    val resId = activity.resources.getIdentifier(cellId,
                            "id",
                            activity.packageName)
                    views[r][c] = activity.findViewById(resId)
                }
            }
        }

        fun bind(board: GameBoard) {
            gameBoard = board
            updateView()
        }

        fun updateView() {
            for(r in 0..3) {
                for (c in 0..3) {
                    views[r][c]?.text = "${gameBoard.values[r][c]}"
                }
            }
        }
    }