Initial commit

app/src/main/java/com/example/superheroes/MainActivity.kt

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+/*
+ * Copyright (c) 2022 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.example.superheroes
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Scaffold
+import androidx.compose.material.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import com.example.superheroes.model.HeroesRepository
+import com.example.superheroes.ui.theme.SuperheroesTheme
+
+class MainActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContent {
+            SuperheroesTheme {
+                SuperheroesApp()
+            }
+        }
+    }
+}
+
+/**
+ * Composable that displays an app bar and a list of heroes.
+ */
+@Composable
+fun SuperheroesApp() {
+    Scaffold(
+        modifier = Modifier.fillMaxSize(),
+        topBar = {
+            TopAppBar()
+        }
+    ) {
+        /* Important: It is not a good practice to access data source directly from the UI.
+        In later units you will learn how to use ViewModel in such scenarios that takes the
+        data source as a dependency and exposes heroes.
+         */
+        val heroes = HeroesRepository.heroes
+        HeroesList(heroes = heroes, Modifier.padding(it))
+
+    }
+}
+
+/**
+ * Composable that displays a Top Bar with an icon and text.
+ *
+ * @param modifier modifiers to set to this composable
+ */
+@Composable
+fun TopAppBar(modifier: Modifier = Modifier) {
+    Box(
+        modifier = modifier
+            .fillMaxWidth()
+            .size(56.dp),
+        contentAlignment = Alignment.Center
+    ) {
+        Text(
+            text = stringResource(R.string.app_name),
+            style = MaterialTheme.typography.h1,
+        )
+    }
+}
+
+@Preview(showBackground = true)
+@Composable
+fun SuperHeroesPreview() {
+    SuperheroesTheme {
+        SuperheroesApp()
+    }
+}