Кастомный PieChart c категориями трат

app/src/main/java/otus/homework/customview/MainActivity.kt

@@ -2,10 +2,107 @@ package otus.homework.customview
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.widget.TextView
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import java.io.InputStream
+import java.util.Locale
 
 class MainActivity : AppCompatActivity() {
+
+    private lateinit var pieChartView: PieChartView
+    private lateinit var selectedCategoryText: TextView
+    private lateinit var selectedAmountText: TextView
+    private lateinit var selectedPercentageText: TextView
+
+    companion object {
+        private const val KEY_SELECTED_CATEGORY = "selected_category"
+        private const val KEY_SELECTED_AMOUNT = "selected_amount"
+        private const val KEY_SELECTED_PERCENTAGE = "selected_percentage"
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        pieChartView = findViewById(R.id.pieChartView)
+        selectedCategoryText = findViewById(R.id.selectedCategoryText)
+        selectedAmountText = findViewById(R.id.selectedAmountText)
+        selectedPercentageText = findViewById(R.id.selectedPercentageText)
+
+        // Загружаем данные из JSON
+        val expenses = loadExpensesFromJson()
+
+        // Устанавливаем данные в график
+        pieChartView.setData(expenses)
+
+        // Восстанавливаем состояние если есть
+        if (savedInstanceState != null) {
+            restoreState(savedInstanceState)
+        } else {
+            // Или используем состояние из PieChartView
+            pieChartView.getSelectedCategory()?.let { category ->
+                updateCategoryInfo(category)
+            }
+        }
+
+        // Устанавливаем коллбек
+        pieChartView.onCategoryClickListener = { category ->
+            updateCategoryInfo(category)
+        }
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+
+        // Сохраняем выбранную категорию
+        pieChartView.getSelectedCategory()?.let { category ->
+            outState.putString(KEY_SELECTED_CATEGORY, category.category)
+            outState.putDouble(KEY_SELECTED_AMOUNT, category.totalAmount)
+            outState.putFloat(KEY_SELECTED_PERCENTAGE, category.percentage)
+        }
     }
+
+    private fun restoreState(savedInstanceState: Bundle?) {
+        val categoryName = savedInstanceState?.getString(KEY_SELECTED_CATEGORY)
+        val amount = savedInstanceState?.getDouble(KEY_SELECTED_AMOUNT)
+        val percentage = savedInstanceState?.getFloat(KEY_SELECTED_PERCENTAGE)
+
+        if (categoryName != null) {
+            // Создаем временный объект категории
+            val category = CategoryData(
+                category = categoryName,
+                totalAmount = amount ?: 0.0,
+                percentage = percentage ?: 0f,
+                color = 0
+            )
+
+            // Обновляем UI
+            updateCategoryInfo(category)
+
+            // Сообщаем PieChartView о выбранной категории
+            pieChartView.setSelectedCategory(categoryName)
+        }
+    }
+
+    private fun updateCategoryInfo(category: CategoryData) {
+        selectedCategoryText.text = getString(R.string.category_template, category.category)
+        selectedAmountText.text = getString(R.string.amount_template, category.totalAmount)
+        selectedPercentageText.text = getString(R.string.percentage_template, category.percentage.toInt())
+    }
+
+    private fun loadExpensesFromJson(): List<Expense> {
+        return try {
+            val inputStream: InputStream = resources.openRawResource(R.raw.payload)
+            val jsonString = inputStream.bufferedReader().use { it.readText() }
+
+            val gson = Gson()
+            val type = object : TypeToken<List<Expense>>() {}.type
+            gson.fromJson(jsonString, type)
+        } catch (e: Exception) {
+            e.printStackTrace()
+            emptyList()
+        }
+    }
+
 }

app/src/main/java/otus/homework/customview/Models.kt

@@ -0,0 +1,16 @@
+package otus.homework.customview
+
+data class Expense(
+    val id: Int,
+    val name: String,
+    val amount: Double,
+    val category: String,
+    val time: Long
+)
+
+data class CategoryData(
+    val category: String,
+    val totalAmount: Double,
+    val percentage: Float,
+    val color: Int
+)