android: Add LobstersTheme

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

android/src/main/java/dev/msfjarvis/claw/android/MainActivity.kt

@@ -3,6 +3,7 @@ package dev.msfjarvis.claw.android
 import android.os.Bundle
 import androidx.activity.compose.setContent
 import androidx.appcompat.app.AppCompatActivity
+import dev.msfjarvis.claw.android.theme.LobstersTheme
 import dev.msfjarvis.claw.common.posts.LobstersItem
 import dev.msfjarvis.lobsters.data.local.SavedPost
 
@@ -22,13 +23,15 @@ class MainActivity : AppCompatActivity() {
   override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     setContent {
-      LobstersItem(
-        post = TEST_POST,
-        isSaved = false,
-        {},
-        {},
-        {},
-      )
+      LobstersTheme {
+        LobstersItem(
+          post = TEST_POST,
+          isSaved = false,
+          {},
+          {},
+          {},
+        )
+      }
     }
   }
 }

android/src/main/java/dev/msfjarvis/claw/android/theme/Theme.kt

@@ -0,0 +1,42 @@
+package dev.msfjarvis.claw.android.theme
+
+import androidx.compose.foundation.isSystemInDarkTheme
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.darkColors
+import androidx.compose.material.lightColors
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.graphics.Color
+
+val titleColor = Color(0xFF7395D9)
+
+val lightColors =
+  lightColors(
+    primary = Color.White,
+    secondary = Color(0xFF6C0000),
+    background = Color.White,
+    surface = Color.White,
+    onPrimary = Color.DarkGray,
+    onSecondary = Color.White,
+    onBackground = Color.White,
+    onSurface = Color.White,
+  )
+
+val darkColors =
+  darkColors(
+    primary = Color.White,
+    secondary = Color(0xFFD2362D),
+    background = Color.Black,
+    surface = Color.Black,
+    onPrimary = Color.Black,
+    onSecondary = Color.White,
+    onBackground = Color.White,
+    onSurface = Color.White,
+  )
+
+@Composable
+fun LobstersTheme(children: @Composable () -> Unit) {
+  MaterialTheme(
+    colors = if (isSystemInDarkTheme()) darkColors else lightColors,
+    content = children,
+  )
+}