android example fixes

Author: AndreiKingsley

examples/android-example/app/build.gradle.kts

@@ -77,5 +77,6 @@ dependencies {
     debugImplementation(libs.androidx.ui.tooling)
     debugImplementation(libs.androidx.ui.test.manifest)
 
+    // TODO update version
     implementation("org.jetbrains.kotlinx:dataframe:1.0.0-dev-7831")
-}
+}

examples/android-example/app/keks.ipynb

@@ -54,6 +54,16 @@ class MainActivity : ComponentActivity() {
     }
 }
 
+@Preview(showBackground = true)
+@Composable
+fun DefaultDataFrameScreenPreview() {
+    val df = dataFrameOf(
+        "name" to listOf("Andrei", "Nikita", "Jolan"),
+        "age" to listOf(22, 16, 37)
+    ).cast<Person>()
+    DataFrameScreen(df)
+}
+
 @Composable
 fun DataFrameScreen(df: DataFrame<Person>) {
     Column(
@@ -87,6 +97,16 @@ fun DataFrameScreen(df: DataFrame<Person>) {
     }
 }
 
+@Preview(showBackground = true)
+@Composable
+fun DefaultDataFrameTablePreview() {
+    val df = dataFrameOf(
+        "name" to listOf("Andrei", "Nikita", "Jolan"),
+        "age" to listOf(22, 16, 37)
+    ).cast<Person>()
+    DataFrameTable(df)
+}
+
 @Composable
 fun DataFrameTable(df: DataFrame<*>) {
     val columnNames = df.columnNames()