├── README.md
└── mathgame
    ├── MainActivity.kt
    ├── ResultActivity.kt
    ├── GameActivity.kt
    ├── GameActivity1.kt
    └── GameActivity2.kt


/README.md:
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1 | # Math_Game_for_Kids
2 | I have created an app which is for kids and have also put this app on play store for study purpose. If there is any problem, please commit.
3 | 


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/mathgame/MainActivity.kt:
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 1 | package com.lkrd.mathgame
 2 | 
 3 | import android.annotation.SuppressLint
 4 | import android.content.Intent
 5 | import androidx.appcompat.app.AppCompatActivity
 6 | import android.os.Bundle
 7 | import android.widget.Button
 8 | 
 9 | class MainActivity : AppCompatActivity() {
10 | 
11 |     lateinit var addition:Button
12 |     lateinit var subtraction:Button
13 |     lateinit var multi:Button
14 | 
15 |     @SuppressLint("MissingInflatedId")
16 |     override fun onCreate(savedInstanceState: Bundle?) {
17 |         super.onCreate(savedInstanceState)
18 |         setContentView(R.layout.activity_main)
19 | 
20 |         addition=findViewById(R.id.buttonAdd)
21 |         subtraction=findViewById(R.id.buttonSub)
22 |         multi=findViewById(R.id.buttonMulti)
23 | 
24 |         addition.setOnClickListener {
25 | 
26 |             var intent=Intent(this,GameActivity::class.java)
27 |             startActivity(intent)
28 |         }
29 |         subtraction.setOnClickListener {
30 |             val intent=Intent(this,GameActivity1::class.java)
31 |             startActivity(intent)
32 | 
33 |         }
34 |         multi.setOnClickListener {
35 |             val intent=Intent(this,GameActivity2::class.java)
36 |             startActivity(intent)
37 |         }
38 |     }
39 | }


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/mathgame/ResultActivity.kt:
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 1 | package com.lkrd.mathgame
 2 | 
 3 | import android.content.Intent
 4 | import androidx.appcompat.app.AppCompatActivity
 5 | import android.os.Bundle
 6 | import android.widget.Button
 7 | import android.widget.TextView
 8 | 
 9 | class ResultActivity : AppCompatActivity() {
10 | 
11 |     lateinit var result: TextView
12 |     lateinit var playAgain: Button
13 |     lateinit var exit: Button
14 | 
15 |     override fun onCreate(savedInstanceState: Bundle?) {
16 |         super.onCreate(savedInstanceState)
17 |         setContentView(R.layout.activity_result)
18 | 
19 |         result=findViewById(R.id.textViewResult)
20 |         playAgain=findViewById(R.id.buttonAgain)
21 |         exit=findViewById(R.id.buttonExit)
22 | 
23 |         val score = intent.getIntExtra("score",0)
24 |         result.text= "Your score: " + score
25 | 
26 |         playAgain.setOnClickListener {
27 | 
28 |             var intent = Intent(this,MainActivity::class.java)
29 |             startActivity(intent)
30 |             finish()
31 |         }
32 |         exit.setOnClickListener {
33 |             var intent = Intent(Intent.ACTION_MAIN)
34 |             intent.addCategory(Intent.CATEGORY_HOME)
35 |             intent.flags= Intent.FLAG_ACTIVITY_NEW_TASK
36 |             startActivity(intent)
37 |         }
38 |     }
39 | }


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/mathgame/GameActivity.kt:
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  1 | package com.lkrd.mathgame
  2 | 
  3 | import android.content.Intent
  4 | import androidx.appcompat.app.AppCompatActivity
  5 | import android.os.Bundle
  6 | import android.os.CountDownTimer
  7 | import android.widget.Button
  8 | import android.widget.EditText
  9 | import android.widget.TextView
 10 | import android.widget.Toast
 11 | import java.util.Locale
 12 | import kotlin.random.Random
 13 | 
 14 | class GameActivity : AppCompatActivity() {
 15 | 
 16 |     lateinit var textScore:TextView
 17 |     lateinit var textLife:TextView
 18 |     lateinit var textTime:TextView
 19 | 
 20 |     lateinit var textQuestion:TextView
 21 |     lateinit var editTextAnswer:EditText
 22 | 
 23 |     lateinit var buttonOk:Button
 24 |     lateinit var buttonNext:Button
 25 | 
 26 |     var correctAnswer = 0
 27 |     var userScore= 0
 28 |     var userLife= 3
 29 | 
 30 |   lateinit var timer : CountDownTimer
 31 |   private val startTimerMillis : Long =40000
 32 |     var timeLeftInMillis : Long = startTimerMillis
 33 | 
 34 |     override fun onCreate(savedInstanceState: Bundle?) {
 35 |         super.onCreate(savedInstanceState)
 36 |         setContentView(R.layout.activity_game)
 37 | 
 38 |         supportActionBar?.title = "Addition"
 39 | 
 40 |         textScore = findViewById(R.id.textViewScore)
 41 |         textLife = findViewById(R.id.textViewLife)
 42 |         textTime = findViewById(R.id.textViewTime)
 43 |         textQuestion = findViewById(R.id.textViewQuestion)
 44 |         editTextAnswer = findViewById(R.id.editTextAnswer)
 45 |         buttonOk = findViewById(R.id.buttonOk)
 46 |         buttonNext = findViewById(R.id.buttonNext)
 47 | 
 48 |         gameContinue()
 49 | 
 50 |         buttonOk.setOnClickListener {
 51 | 
 52 |             var input = editTextAnswer.text.toString()
 53 |             if (input == "") {
 54 |                 Toast.makeText(
 55 |                     this, "Please write an answer or click the next button",
 56 |                     Toast.LENGTH_SHORT
 57 |                 ).show()
 58 |             } else {
 59 | 
 60 |                 pauseTimer()
 61 | 
 62 |                 val userAnswer = input.toInt()
 63 | 
 64 |                 if (userAnswer == correctAnswer) {
 65 |                     userScore = userScore + 10
 66 |                     textQuestion.text = "Congratulation,your answer is correct"
 67 |                     textScore.text = userScore.toString()
 68 |                 } else {
 69 |                     userLife--
 70 |                     textQuestion.text = "Sorry, your answer is wrong "
 71 |                     textLife.text = userLife.toString()
 72 |                 }
 73 |             }
 74 |         }
 75 |         buttonNext.setOnClickListener {
 76 | 
 77 |             pauseTimer()
 78 |             resetTimer()
 79 |             editTextAnswer.setText("")
 80 | 
 81 |             if (userLife == 0) {
 82 | 
 83 |                 Toast.makeText(this, "Game Over", Toast.LENGTH_SHORT).show()
 84 |                 val intent = Intent(this, ResultActivity::class.java)
 85 |                 intent.putExtra("score", userScore)
 86 |                 startActivity(intent)
 87 |                 finish()
 88 | 
 89 |             } else {
 90 |                 gameContinue()
 91 |             }
 92 |         }
 93 |     }fun gameContinue(){
 94 | 
 95 |         var number1= Random.nextInt(0,100)
 96 |         var number2= Random.nextInt(0,50)
 97 | 
 98 |         textQuestion.text="$number1 + $number2"
 99 | 
100 |         correctAnswer= number1 + number2
101 | 
102 |         startTimer()
103 |     }
104 | 
105 |     fun startTimer()
106 |     {
107 |         timer = object : CountDownTimer(timeLeftInMillis,1000){
108 |             override fun onTick(millisUntilFinished : Long) {
109 | 
110 |                 timeLeftInMillis = millisUntilFinished
111 |                 updateText()
112 |             }
113 |             override fun onFinish() {
114 | 
115 |                 pauseTimer()
116 |                 resetTimer()
117 |                 updateText()
118 | 
119 |                 userLife--
120 |                 textLife.text= userLife.toString()
121 |                 textQuestion.text = "Sorry,Time is up!"
122 | 
123 |             }
124 |         }.start()
125 | 
126 |     }
127 |     fun updateText(){
128 |         var remainingTime: Int = (timeLeftInMillis/1000).toInt()
129 |         textTime.text = String.format(Locale.getDefault(),"%02d",remainingTime)
130 |     }
131 |     fun pauseTimer(){
132 |         timer.cancel()
133 | 
134 |     }
135 |     fun resetTimer(){
136 |         timeLeftInMillis = startTimerMillis
137 |         updateText()
138 |     }
139 | }
140 | 
141 | 


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/mathgame/GameActivity1.kt:
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  1 | package com.lkrd.mathgame
  2 | 
  3 | import android.annotation.SuppressLint
  4 | import android.content.Intent
  5 | import androidx.appcompat.app.AppCompatActivity
  6 | import android.os.Bundle
  7 | import android.os.CountDownTimer
  8 | import android.widget.Button
  9 | import android.widget.EditText
 10 | import android.widget.TextView
 11 | import android.widget.Toast
 12 | import java.util.Locale
 13 | import kotlin.random.Random
 14 | 
 15 | class GameActivity1 : AppCompatActivity() {
 16 | 
 17 |     lateinit var textScore: TextView
 18 |     lateinit var textLife: TextView
 19 |     lateinit var textTime: TextView
 20 | 
 21 |     lateinit var textQuestion: TextView
 22 |     lateinit var editTextAnswer: EditText
 23 | 
 24 |     lateinit var buttonOk: Button
 25 |     lateinit var buttonNext: Button
 26 | 
 27 |     var correctAnswer = 0
 28 |     var userScore= 0
 29 |     var userLife= 3
 30 | 
 31 |     lateinit var timer : CountDownTimer
 32 |     private val startTimerMillis : Long =40000
 33 |     var timeLeftInMillis : Long = startTimerMillis
 34 | 
 35 |     @SuppressLint("MissingInflatedId")
 36 |     override fun onCreate(savedInstanceState: Bundle?) {
 37 |         super.onCreate(savedInstanceState)
 38 |         setContentView(R.layout.activity_game1)
 39 | 
 40 |         supportActionBar?.title = "Subtraction"
 41 | 
 42 |         textScore = findViewById(R.id.textViewScore)
 43 |         textLife = findViewById(R.id.textViewLife)
 44 |         textTime = findViewById(R.id.textViewTime)
 45 |         textQuestion = findViewById(R.id.textViewQuestion)
 46 |         editTextAnswer = findViewById(R.id.editTextAnswer)
 47 |         buttonOk = findViewById(R.id.buttonOk)
 48 |         buttonNext = findViewById(R.id.buttonNext)
 49 | 
 50 |         gameContinue()
 51 | 
 52 |         buttonOk.setOnClickListener {
 53 | 
 54 |             var input = editTextAnswer.text.toString()
 55 |             if (input == "") {
 56 |                 Toast.makeText(
 57 |                     this, "Please write an answer or click the next button",
 58 |                     Toast.LENGTH_SHORT
 59 |                 ).show()
 60 |             } else {
 61 | 
 62 |                 pauseTimer()
 63 | 
 64 |                 val userAnswer = input.toInt()
 65 | 
 66 |                 if (userAnswer == correctAnswer) {
 67 |                     userScore = userScore + 10
 68 |                     textQuestion.text = "Congratulation,your answer is correct"
 69 |                     textScore.text = userScore.toString()
 70 |                 } else {
 71 |                     userLife--
 72 |                     textQuestion.text = "Sorry, your answer is wrong "
 73 |                     textLife.text = userLife.toString()
 74 |                 }
 75 |             }
 76 |         }
 77 |         buttonNext.setOnClickListener {
 78 | 
 79 |             pauseTimer()
 80 |             resetTimer()
 81 |             editTextAnswer.setText("")
 82 | 
 83 |             if (userLife == 0) {
 84 | 
 85 |                 Toast.makeText(this, "Game Over", Toast.LENGTH_SHORT).show()
 86 |                 val intent = Intent(this, ResultActivity::class.java)
 87 |                 intent.putExtra("score", userScore)
 88 |                 startActivity(intent)
 89 |                 finish()
 90 | 
 91 |             } else {
 92 |                 gameContinue()
 93 |             }
 94 |         }
 95 |     }fun gameContinue(){
 96 | 
 97 |         var number1= Random.nextInt(0,100,)
 98 |         var number2= Random.nextInt(0,40)
 99 | 
100 |         textQuestion.text="$number1 - $number2"
101 | 
102 |         correctAnswer= number1 - number2
103 | 
104 |         startTimer()
105 |     }
106 | 
107 |     fun startTimer()
108 |     {
109 |         timer = object : CountDownTimer(timeLeftInMillis,1000){
110 |             override fun onTick(millisUntilFinished : Long) {
111 | 
112 |                 timeLeftInMillis = millisUntilFinished
113 |                 updateText()
114 |             }
115 |             override fun onFinish() {
116 | 
117 |                 pauseTimer()
118 |                 resetTimer()
119 |                 updateText()
120 | 
121 |                 userLife--
122 |                 textLife.text= userLife.toString()
123 |                 textQuestion.text = "Sorry,Time is up!"
124 | 
125 |             }
126 |         }.start()
127 | 
128 |     }
129 |     fun updateText(){
130 |         var remainingTime: Int = (timeLeftInMillis/1000).toInt()
131 |         textTime.text = String.format(Locale.getDefault(),"%02d",remainingTime)
132 |     }
133 |     fun pauseTimer(){
134 |         timer.cancel()
135 | 
136 |     }
137 |     fun resetTimer(){
138 |         timeLeftInMillis = startTimerMillis
139 |         updateText()
140 |     }
141 | }


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/mathgame/GameActivity2.kt:
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  1 | package com.lkrd.mathgame
  2 | 
  3 | import android.annotation.SuppressLint
  4 | import android.content.Intent
  5 | import androidx.appcompat.app.AppCompatActivity
  6 | import android.os.Bundle
  7 | import android.os.CountDownTimer
  8 | import android.widget.Button
  9 | import android.widget.EditText
 10 | import android.widget.TextView
 11 | import android.widget.Toast
 12 | import java.util.Locale
 13 | import kotlin.random.Random
 14 | 
 15 | class GameActivity2 : AppCompatActivity() {
 16 | 
 17 |     lateinit var textScore: TextView
 18 |     lateinit var textLife: TextView
 19 |     lateinit var textTime: TextView
 20 | 
 21 |     lateinit var textQuestion: TextView
 22 |     lateinit var editTextAnswer: EditText
 23 | 
 24 |     lateinit var buttonOk: Button
 25 |     lateinit var buttonNext: Button
 26 | 
 27 |     var correctAnswer = 0
 28 |     var userScore= 0
 29 |     var userLife= 3
 30 | 
 31 |     lateinit var timer : CountDownTimer
 32 |     private val startTimerMillis : Long =40000
 33 |     var timeLeftInMillis : Long = startTimerMillis
 34 | 
 35 |     @SuppressLint("MissingInflatedId")
 36 |     override fun onCreate(savedInstanceState: Bundle?) {
 37 |         super.onCreate(savedInstanceState)
 38 |         setContentView(R.layout.activity_game2)
 39 | 
 40 |         supportActionBar?.title = "Multiplication"
 41 | 
 42 |         textScore = findViewById(R.id.textViewScore)
 43 |         textLife = findViewById(R.id.textViewLife)
 44 |         textTime = findViewById(R.id.textViewTime)
 45 |         textQuestion = findViewById(R.id.textViewQuestion)
 46 |         editTextAnswer = findViewById(R.id.editTextAnswer)
 47 |         buttonOk = findViewById(R.id.buttonOk)
 48 |         buttonNext = findViewById(R.id.buttonNext)
 49 | 
 50 |         gameContinue()
 51 | 
 52 |         buttonOk.setOnClickListener {
 53 | 
 54 |             var input = editTextAnswer.text.toString()
 55 |             if (input == "") {
 56 |                 Toast.makeText(
 57 |                     this, "Please write an answer or click the next button",
 58 |                     Toast.LENGTH_SHORT
 59 |                 ).show()
 60 |             } else {
 61 | 
 62 |                 pauseTimer()
 63 | 
 64 |                 val userAnswer = input.toInt()
 65 | 
 66 |                 if (userAnswer == correctAnswer) {
 67 |                     userScore = userScore + 10
 68 |                     textQuestion.text = "Congratulation,your answer is correct"
 69 |                     textScore.text = userScore.toString()
 70 |                 } else {
 71 |                     userLife--
 72 |                     textQuestion.text = "Sorry, your answer is wrong "
 73 |                     textLife.text = userLife.toString()
 74 |                 }
 75 |             }
 76 |         }
 77 |         buttonNext.setOnClickListener {
 78 | 
 79 |             pauseTimer()
 80 |             resetTimer()
 81 |             editTextAnswer.setText("")
 82 | 
 83 |             if (userLife == 0) {
 84 | 
 85 |                 Toast.makeText(this, "Game Over", Toast.LENGTH_SHORT).show()
 86 |                 val intent = Intent(this, ResultActivity::class.java)
 87 |                 intent.putExtra("score", userScore)
 88 |                 startActivity(intent)
 89 |                 finish()
 90 | 
 91 |             } else {
 92 |                 gameContinue()
 93 |             }
 94 |         }
 95 |     }fun gameContinue(){
 96 | 
 97 |         var number1= Random.nextInt(0,20,)
 98 |         var number2= Random.nextInt(0,20)
 99 | 
100 |         textQuestion.text="$number1 * $number2"
101 | 
102 |         correctAnswer= number1 * number2
103 | 
104 |         startTimer()
105 |     }
106 | 
107 |     fun startTimer()
108 |     {
109 |         timer = object : CountDownTimer(timeLeftInMillis,1000){
110 |             override fun onTick(millisUntilFinished : Long) {
111 | 
112 |                 timeLeftInMillis = millisUntilFinished
113 |                 updateText()
114 |             }
115 |             override fun onFinish() {
116 | 
117 |                 pauseTimer()
118 |                 resetTimer()
119 |                 updateText()
120 | 
121 |                 userLife--
122 |                 textLife.text= userLife.toString()
123 |                 textQuestion.text = "Sorry,Time is up!"
124 | 
125 |             }
126 |         }.start()
127 | 
128 |     }
129 |     fun updateText(){
130 |         var remainingTime: Int = (timeLeftInMillis/1000).toInt()
131 |         textTime.text = String.format(Locale.getDefault(),"%02d",remainingTime)
132 |     }
133 |     fun pauseTimer(){
134 |         timer.cancel()
135 | 
136 |     }
137 |     fun resetTimer(){
138 |         timeLeftInMillis = startTimerMillis
139 |         updateText()
140 |     }
141 | }


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