1 files changed, 124 insertions, 0 deletions
diff --git a/app/src/main/java/com/google/jetpackcamera/MainActivity.kt b/app/src/main/java/com/google/jetpackcamera/MainActivity.kt
new file mode 100644
index 0000000..a499bb9
--- /dev/null
+++ b/app/src/main/java/com/google/jetpackcamera/MainActivity.kt
@@ -0,0 +1,124 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.google.jetpackcamera
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.viewModels
+import androidx.annotation.VisibleForTesting
+import androidx.compose.foundation.background
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.size
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import com.google.jetpackcamera.MainActivityUiState.Loading
+import com.google.jetpackcamera.MainActivityUiState.Success
+import com.google.jetpackcamera.feature.preview.PreviewViewModel
+import com.google.jetpackcamera.settings.model.DarkMode
+import com.google.jetpackcamera.ui.JcaApp
+import com.google.jetpackcamera.ui.theme.JetpackCameraTheme
+import dagger.hilt.android.AndroidEntryPoint
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.launch
+
+/**
+ * Activity for the JetpackCameraApp.
+ */
+@AndroidEntryPoint(ComponentActivity::class)
+class MainActivity : Hilt_MainActivity() {
+    private val viewModel: MainActivityViewModel by viewModels()
+
+    @VisibleForTesting
+    var previewViewModel: PreviewViewModel? = null
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        var uiState: MainActivityUiState by mutableStateOf(Loading)
+
+        lifecycleScope.launch {
+            lifecycle.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                viewModel.uiState
+                    .onEach {
+                        uiState = it
+                    }
+                    .collect()
+            }
+        }
+        setContent {
+            when (uiState) {
+                Loading -> {
+                    Column(
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .background(Color.Black),
+                        verticalArrangement = Arrangement.Center,
+                        horizontalAlignment = Alignment.CenterHorizontally
+                    ) {
+                        CircularProgressIndicator(modifier = Modifier.size(50.dp))
+                        Text(text = stringResource(R.string.jca_loading), color = Color.White)
+                    }
+                }
+
+                is Success -> {
+                    // TODO(kimblebee@): add app setting to enable/disable dynamic color
+                    JetpackCameraTheme(
+                        darkTheme = isInDarkMode(uiState = uiState),
+                        dynamicColor = false
+                    ) {
+                        Surface(
+                            modifier = Modifier.fillMaxSize(),
+                            color = MaterialTheme.colorScheme.background
+                        ) {
+                            JcaApp(onPreviewViewModel = { previewViewModel = it })
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+
+/**
+ * Determines whether the Theme should be in dark, light, or follow system theme
+ */
+@Composable
+private fun isInDarkMode(uiState: MainActivityUiState): Boolean = when (uiState) {
+    Loading -> isSystemInDarkTheme()
+    is Success -> when (uiState.cameraAppSettings.darkMode) {
+        DarkMode.DARK -> true
+        DarkMode.LIGHT -> false
+        DarkMode.SYSTEM -> isSystemInDarkTheme()
+    }
+}