feat: 닉네임 검증 로직 구현

android/app/src/main/java/com/created/team201/presentation/onBoarding/OnBoardingActivity.kt

@@ -1,13 +1,56 @@
 package com.created.team201.presentation.onBoarding
 
+import android.content.Context
+import android.content.Intent
 import android.os.Bundle
+import android.text.InputFilter.LengthFilter
+import androidx.activity.viewModels
+import androidx.annotation.ColorRes
+import androidx.annotation.StringRes
 import com.created.team201.R
 import com.created.team201.databinding.ActivityOnBoardingBinding
 import com.created.team201.presentation.common.BindingActivity
 
 class OnBoardingActivity :
     BindingActivity<ActivityOnBoardingBinding>(R.layout.activity_on_boarding) {
+    private val viewModel: OnBoardingViewModel by viewModels {
+        OnBoardingViewModel.Factory
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        initBinding()
+        initNickname()
+        setObserveNickname()
+    }
+
+    private fun initBinding() {
+        binding.lifecycleOwner = this
+        binding.viewModel = viewModel
+    }
+
+    private fun initNickname() {
+        binding.etOnBoardingNickname.filters =
+            arrayOf(viewModel.getInputFilter(), LengthFilter(MAX_NICKNAME_LENGTH))
+    }
+
+    private fun setObserveNickname() {
+        viewModel.nicknameState.observe(this) { state ->
+            setNicknameValidateIntroduction(state.color, state.introduction)
+        }
+    }
+
+    private fun setNicknameValidateIntroduction(
+        @ColorRes color: Int, @StringRes text: Int
+    ) {
+        binding.tvOnBoardingNicknameValidateIntroduction.setTextColor(getColor(color))
+        binding.tvOnBoardingNicknameValidateIntroduction.text = getString(text)
+    }
+
+    companion object {
+        private const val MAX_NICKNAME_LENGTH = 8
+
+        fun getIntent(context: Context): Intent = Intent(context, OnBoardingActivity::class.java)
     }
 }

android/app/src/main/java/com/created/team201/presentation/onBoarding/OnBoardingViewModel.kt

@@ -0,0 +1,84 @@
+package com.created.team201.presentation.onBoarding
+
+import android.text.InputFilter
+import android.text.Spanned
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MediatorLiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewmodel.initializer
+import androidx.lifecycle.viewmodel.viewModelFactory
+import com.created.team201.presentation.onBoarding.model.NicknameState
+import com.created.team201.presentation.onBoarding.model.NicknameUiModel
+import com.created.team201.util.NonNullLiveData
+import com.created.team201.util.NonNullMutableLiveData
+import java.util.regex.Pattern
+
+class OnBoardingViewModel : ViewModel() {
+    private val _nickname: MutableLiveData<NicknameUiModel> = MutableLiveData()
+    val nickname: LiveData<NicknameUiModel>
+        get() = _nickname
+
+    private val _introduction: NonNullMutableLiveData<String> = NonNullMutableLiveData("")
+    val introduction: NonNullLiveData<String>
+        get() = _introduction
+
+    private val _nicknameState: MutableLiveData<NicknameState> = MutableLiveData()
+    val nicknameState: LiveData<NicknameState>
+        get() = _nicknameState
+
+    private val _isEnableSave: MediatorLiveData<Boolean> =
+        MediatorLiveData<Boolean>().apply {
+            addSourceList(nickname, nicknameState) {
+                isInitializeOnBoarding()
+            }
+        }
+    val isEnableSave: LiveData<Boolean>
+        get() = _isEnableSave
+
+    fun setNickname(nickname: String) {
+        _nickname.value = NicknameUiModel(nickname)
+    }
+
+    fun getInputFilter(): InputFilter = object : InputFilter {
+        override fun filter(
+            text: CharSequence,
+            start: Int,
+            end: Int,
+            dest: Spanned,
+            dStart: Int,
+            dEnd: Int
+        ): CharSequence {
+            if (text.isBlank() || PATTERN_NICKNAME.matcher(text).matches())
+                return text
+
+            _nicknameState.value = NicknameState.UNAVAILABLE
+            return ""
+        }
+    }
+
+    private fun isInitializeOnBoarding(): Boolean =
+        nickname.value != null && nicknameState.value == NicknameState.AVAILABLE
+
+    private fun <T> MediatorLiveData<T>.addSourceList(
+        vararg liveDataArgument: LiveData<*>,
+        onChanged: () -> T,
+    ) {
+        liveDataArgument.forEach {
+            this.addSource(it) {
+                value = onChanged()
+            }
+        }
+    }
+
+    companion object {
+        private val PATTERN_NICKNAME = Pattern.compile("^[_a-zA-Z0-9가-힣ㄱ-ㅎㅏ-ㅣ]+$")
+
+        val Factory: ViewModelProvider.Factory = viewModelFactory {
+            initializer {
+                OnBoardingViewModel()
+            }
+        }
+    }
+}

android/app/src/main/java/com/created/team201/presentation/onBoarding/model/NicknameState.kt

@@ -0,0 +1,34 @@
+package com.created.team201.presentation.onBoarding.model
+
+import androidx.annotation.ColorRes
+import androidx.annotation.StringRes
+import com.created.team201.R
+
+sealed interface NicknameState {
+    @get:ColorRes
+    val color: Int
+
+    @get:StringRes
+    val introduction: Int
+
+    object AVAILABLE : NicknameState {
+        override val color: Int
+            get() = R.color.blue_9BB9F2
+        override val introduction: Int
+            get() = R.string.onBoarding_available_nickname
+    }
+
+    object UNAVAILABLE : NicknameState {
+        override val color: Int
+            get() = R.color.red_EB7A7A
+        override val introduction: Int
+            get() = R.string.onBoarding_unAvailable_nickname
+    }
+
+    object DUPLICATE : NicknameState {
+        override val color: Int
+            get() = R.color.red_EB7A7A
+        override val introduction: Int
+            get() = R.string.onBoarding_duplicate_nickname
+    }
+}

android/app/src/main/java/com/created/team201/presentation/onBoarding/model/NicknameUiModel.kt

@@ -0,0 +1,5 @@
+package com.created.team201.presentation.onBoarding.model
+
+data class NicknameUiModel(
+    val nickname: String
+)

android/app/src/main/res/layout/activity_on_boarding.xml

@@ -4,6 +4,9 @@
 
     <data>
 
+        <variable
+            name="viewModel"
+            type="com.created.team201.presentation.onBoarding.OnBoardingViewModel" />
     </data>
 
     <androidx.constraintlayout.widget.ConstraintLayout
@@ -72,6 +75,7 @@
             android:inputType="text"
             android:maxLength="8"
             android:maxLines="1"
+            android:onTextChanged="@{(text, start, before, count) -> viewModel.setNickname(text)}"
             android:paddingHorizontal="12dp"
             android:textAppearance="@style/text_r14"
             android:textColor="@color/white"
@@ -144,6 +148,7 @@
             android:layout_marginHorizontal="16dp"
             android:layout_marginBottom="28dp"
             android:background="@drawable/bg_btn_color_and_radius_10dp_disabled"
+            android:enabled="@{viewModel.isEnableSave()}"
             android:paddingVertical="14dp"
             android:text="@string/onBoarding_btn_text"
             android:textAlignment="center"