Create the OnboardingActivity

MAILAND-2695

app/src/main/AndroidManifest.xml

@@ -433,6 +433,7 @@
         <activity
             android:name="me.proton.core.crypto.validator.presentation.ui.CryptoValidatorErrorDialogActivity"
             android:theme="@style/ProtonTheme.Transparent" />
+        <activity android:name=".onboarding.presentation.OnboardingActivity" />
     </application>
 
 </manifest>

app/src/main/java/ch/protonmail/android/onboarding/presentation/OnboardingActivity.kt

@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2022 Proton Technologies AG
+ *
+ * This file is part of ProtonMail.
+ *
+ * ProtonMail is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ProtonMail is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ProtonMail. If not, see https://www.gnu.org/licenses/.
+ */
+
+package ch.protonmail.android.onboarding.presentation
+
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import androidx.activity.viewModels
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.lifecycleScope
+import androidx.viewpager2.widget.ViewPager2
+import ch.protonmail.android.R
+import ch.protonmail.android.databinding.ActivityOnboardingBinding
+import ch.protonmail.android.onboarding.presentation.model.OnboardingItemUiModel
+import dagger.hilt.android.AndroidEntryPoint
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+
+@AndroidEntryPoint
+class OnboardingActivity : AppCompatActivity() {
+
+    private val viewModel: OnboardingViewModel by viewModels()
+    private val binding by lazy {
+        ActivityOnboardingBinding.inflate(layoutInflater)
+    }
+    private val onboardingAdapter = OnboardingAdapter()
+    private val onPageChangeCallback = object : ViewPager2.OnPageChangeCallback() {
+        override fun onPageSelected(position: Int) {
+            super.onPageSelected(position)
+            if (position == onboardingAdapter.itemCount - 1) {
+                binding.onboardingButton.setText(R.string.onboarding_get_started)
+                binding.onboardingToolbar.menu.findItem(R.id.skip)?.isVisible = false
+            } else {
+                binding.onboardingButton.setText(R.string.onboarding_next)
+                binding.onboardingToolbar.menu.findItem(R.id.skip)?.isVisible = true
+            }
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(binding.root)
+        setSupportActionBar(binding.onboardingToolbar)
+        supportActionBar?.setDisplayShowTitleEnabled(false)
+
+        window.statusBarColor = ContextCompat.getColor(this, R.color.background_secondary)
+
+        viewModel.onboardingState
+            .onEach {
+                setOnboardingAdapterItems(it.onboardingItemsList)
+            }
+            .launchIn(lifecycleScope)
+
+        binding.onboardingViewPager.adapter = onboardingAdapter
+        binding.onboardingViewPager.registerOnPageChangeCallback(onPageChangeCallback)
+        binding.onboardingButton.setOnClickListener {
+            if (binding.onboardingViewPager.currentItem == onboardingAdapter.itemCount - 1) {
+                finish()
+            } else {
+                binding.onboardingViewPager.currentItem = binding.onboardingViewPager.currentItem + 1
+            }
+        }
+    }
+
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        menuInflater.inflate(R.menu.menu_onboarding, menu)
+        return super.onCreateOptionsMenu(menu)
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        if (item.itemId == R.id.skip) finish()
+        return super.onOptionsItemSelected(item)
+    }
+
+    override fun onBackPressed() {
+        // The user shouldn't be able to exit the onboarding with the back button
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        binding.onboardingViewPager.unregisterOnPageChangeCallback(onPageChangeCallback)
+    }
+
+    private fun setOnboardingAdapterItems(onboardingItemsList: List<OnboardingItemUiModel>) {
+        onboardingAdapter.setOnboardingItemsList(onboardingItemsList)
+    }
+}

app/src/main/java/ch/protonmail/android/onboarding/presentation/OnboardingViewModel.kt

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2022 Proton Technologies AG
+ *
+ * This file is part of ProtonMail.
+ *
+ * ProtonMail is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * ProtonMail is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ProtonMail. If not, see https://www.gnu.org/licenses/.
+ */
+
+package ch.protonmail.android.onboarding.presentation
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import ch.protonmail.android.R
+import ch.protonmail.android.onboarding.presentation.model.OnboardingItemUiModel
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.flow.stateIn
+import javax.inject.Inject
+
+@HiltViewModel
+class OnboardingViewModel @Inject constructor() : ViewModel() {
+
+    val onboardingState = flowOf(
+        OnboardingState(
+            listOf(
+                OnboardingItemUiModel(
+                    R.drawable.img_onboarding_encryption,
+                    R.string.onboarding_privacy_for_all_headline,
+                    R.string.onboarding_privacy_for_all_description
+                ),
+                OnboardingItemUiModel(
+                    R.drawable.img_onboarding_labels_folders,
+                    R.string.onboarding_neat_and_tidy_headline,
+                    R.string.onboarding_neat_and_tidy_description
+                )
+            )
+        )
+    ).stateIn(viewModelScope, SharingStarted.Lazily, OnboardingState(emptyList()))
+
+    data class OnboardingState(val onboardingItemsList: List<OnboardingItemUiModel>)
+}