import androidx.appcompat.app.AppCompatActivity;

import androidx.core.content.ContextCompat;

import android.os$.$Bundle;

import android.os$.$CountDownTimer;

import android.view.View;

import android.widget.$*$;

public class $|$MainActivity extends AppCompatActivity $\{$

$5$ usages

private MemoryGame mGame;

$10$ usages

private GridLayout mMemoryGrid;

$6$ usages

private int mTurnNumber;

$5$ usages

private int mFirstBtnNdx;

@override

protected void oncreate$($Bundle savedinstancestate$)\{$

super.onCreate $($savedinstancestate$)$;

setContentView$($R$.$layout.activity$\_$main$)$;

mMemoryGrid $=$ findViewById$($R$.$id$.$memory$\_$grid$)$;

$//$ Add the same click handler to all grid buttons

for $($int buttonIndex $=0$; buttonIndex $<$ mMemoryGrid.getchildCount$()$; $))$

$\{$

Button gridButton $=($Button$)$ mMemoryGrid.getchildAt$($buttonIndex$)$;

gridButton.setonclickListener$($this: :onTileButtonclick$)$;

$\}$

mGame $=$ new MemoryGame$()$;

startGame$()$;

$\}$

private void startGame$()\{$

mGame. newGame$()$;

mTurnNumber $=0$;

mFirstBtnNdx $=-1$;

for $($int buttonIndex $=0$; buttonIndex $<$ mMemoryGrid.getChildCount$()$; buttonIndex$++)$

$\{$

Button gridButton $=($Button$)$ mMemoryGrid.getchildAt$($buttonIndex$)$;

$//$ TODO #$2-$ Call the setEnabled and setBackgroundColor methods on the gridButton

$//$ object to enable all grid buttons and set the background color to darkgray $($from color resources$)$

$\}$

$\}$

$1$ usage

private void onTileButtonclick$($View view$)\{$

$//$ Try to prevent fast$-$clicking tiles creating errors

if $($mTurnNumber $==2)$

$\{$

return;

$\}$

$//$ Find the button's row and col

int buttonIndex $=$ mMemoryGrid.indexofChild$($view$)$;

$//$ show the color for this tile

Button gridButton $=($Button$)$ mMemoryGrid.getChildAt$($buttonIndex$)$;

gridButton.setBackgroundColor$($ContextCompat$.$getColor$($context: this, mGame.getTileColor$($buttonIndex$)))$;

if $($mTurnNumber $==0$

$\{$

mTurnNumber $=1$;

mFirstBtnNdx $=$ buttonIndex;

$//$ Disable the first grid button so we can't click it a second time

gridButton.setEnabled$($false$)$;

$\}$

else

$\{$

mTurnNumber $=2$;

$//$ Is it a match??

if$($mGame$.$getTileColor$($mFirstBtnNdx$)==$ mGame.getTileColor$($buttonIndex$))$

$\{$

$//$ Yes, disable the buttons and leave the colors displayed

Button firstButton Button$)$ mMemoryGrid.getChildAt $($mFirstBtnNdx$)$;

firstButton. setEnabled$($false$)$;

gridButton.setEnabled$($false$)$;

Toast.makeText $($ context: this, "It's a match!", Toast.LENGTH$\_$SHORT$).$show$()$;

$//$ check if game is over...

checkForGameover$()$;

$\}$

else

$\{$

$//$ No$,$ delay $750$ then hide the tiles

new CountDownTimer $($ millisinFuture: $750,$ countDowninterval: $750)\{$

$5$ usages

public void onTick$($long millisUntilFinished$)\{$

$\}$

public void onFinish$()\{$

Button firstButton Button$)$ mMemoryGrid.getChildAt$($mFirstBtnNdx$)$;

hideTiles$($firstButton$,$ gridButton$)$;

$\}$

$\}.$start$()$;

$\}$

mTurnNumber $=0$;

$\}$

public void hideTiles$($Button btn$1,$ Button btn$2)$

$\{$

btn$1.$setBackgroundColor $($ContextCompat$.$getColor $($context: this, R$.$color.darkGray$))$;

btn$2.$setBackgroundColor $($ContextCompat$.$getColor $($context: this, R$.$color.darkGray$))$;

btn$1.$setEnabled$($true$)$;

btn$2.$setEnabled$($true$)$;

$\}$

$1$ usage

public void onNewGameClick$($View view$)\{$startGame$()$; $\}$

$1$ usage

public void checkForGameOver$()$

$\{$

boolean gameover $=$ true;

for $($int buttonIndex $=0$; $)$ mMemoryGrid.getChildCount $()$; buttonIndex$++)$

$\{$

$//$ TODO #$3-$ Get a reference to each grid button and call the isEnabled method

$//$ to determine if any grid buttons are enabled. If the enabled property is true

$//$ the gameover variable should be set to false

$\}$

$//$ Congratulate the user if the game is over

if $($gameover$)\{$

Toast.makeText $($ context: this, "Congratulations!", Toast.LENGTH$\_$LONG$).$show$()$;

$\}$

$\}$

$2$ usages

public class MemoryGame $\{$

$3$ usages

private int mGameSize; $//$ How many tiles will be displayed

$2$ usages

private int$[]$ mTilecolors; $//$ Array to hold the color assigned to each tile in the game

$1$ usage

public MemoryGame$()$

$\{$

$//$ Default game size

mGamesize $=16$;

$//$ Create color array

mTilecolors $=$ new int$[$mGameSize$]$;

$\}$

public void newGame$()$

$\{$

Random $rn=$ new Random$()$;

$//$ Create an ArrayList and initialize with all possible values for the game tiles...

ArrayList$<$

$1)$ In MemoryGame.java, complete the definition for the getTileColor method so it will return the indicated element from the mTileColors array.

$2)$ In MainActivity.java, add code to the startGame method to enable each gridButton and set the background color to darkGray $($from color resources$).$ Use the setEnabled and setBackgroundColor methods to set these attributes.

$3)$ In MainActivity.java, complete the checkForGameOver method by adding code inside the for loop to check isEnabled for each grid button and set the gameOver to false if you find a button that is enabled.

$4)$ Add a help activity that displays a simple help message. Make sure you include the code to save the context so you can return to the game in progress.

$5)$ Create a Landscape Qualifier for activity$\_$main.xml$.$ Edit the new land xml so the New Game and Help buttons are located to the right of the game grid.