diff --git a/app/src/main/java/otus/homework/customview/Expense.kt b/app/src/main/java/otus/homework/customview/Expense.kt
new file mode 100644
index 00000000..52685ba2
--- /dev/null
+++ b/app/src/main/java/otus/homework/customview/Expense.kt
@@ -0,0 +1,19 @@
+package otus.homework.customview
+
+import android.content.Context
+import com.google.gson.Gson
+
+data class Expense(
+    val id: Int,
+    val name: String,
+    val amount: Float,
+    val category: String,
+    val time: Long
+)
+
+fun Context.loadExpenses(): List<Expense> {
+    val input = resources.openRawResource(R.raw.payload)
+    val json = input.bufferedReader().use { it.readText() }
+    return Gson().fromJson(json, Array<Expense>::class.java).toList()
+}
+
diff --git a/app/src/main/java/otus/homework/customview/MainActivity.kt b/app/src/main/java/otus/homework/customview/MainActivity.kt
index 78cb9448..b7875b98 100644
--- a/app/src/main/java/otus/homework/customview/MainActivity.kt
+++ b/app/src/main/java/otus/homework/customview/MainActivity.kt
@@ -2,10 +2,20 @@ package otus.homework.customview
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import android.widget.Toast
 
 class MainActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        val pie = findViewById<PieChartView>(R.id.pieChart)
+        pie.setExpenses(loadExpenses())
+
+        pie.listener = object : PieChartView.OnSliceClickListener {
+            override fun onCategoryClick(category: String) {
+                Toast.makeText(this@MainActivity, category, Toast.LENGTH_SHORT).show()
+            }
+        }
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/otus/homework/customview/PieChartView.kt b/app/src/main/java/otus/homework/customview/PieChartView.kt
new file mode 100644
index 00000000..91051c74
--- /dev/null
+++ b/app/src/main/java/otus/homework/customview/PieChartView.kt
@@ -0,0 +1,113 @@
+package otus.homework.customview
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.RectF
+import android.os.Bundle
+import android.os.Parcelable
+import android.util.AttributeSet
+import android.view.MotionEvent
+import android.view.View
+import kotlin.math.atan2
+import kotlin.math.min
+
+class PieChartView @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null
+) : View(context, attrs) {
+
+    interface OnSliceClickListener {
+        fun onCategoryClick(category: String)
+    }
+
+    var listener: OnSliceClickListener? = null
+
+    private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
+    private val rect = RectF()
+
+    private val colors = listOf(
+        Color.RED, Color.BLUE, Color.GREEN, Color.CYAN, Color.MAGENTA,
+        Color.YELLOW, Color.DKGRAY, Color.GRAY, Color.LTGRAY, Color.BLACK
+    )
+
+    private var data: Map<String, Float> = emptyMap()
+    private var angles = mutableListOf<Pair<String, Float>>()
+
+    fun setExpenses(expenses: List<Expense>) {
+        data = expenses.groupBy { it.category }
+            .mapValues { it.value.sumOf { e -> e.amount.toDouble() }.toFloat() }
+        calculateAngles()
+        invalidate()
+    }
+
+    private fun calculateAngles() {
+        angles.clear()
+        val total = data.values.sum()
+        data.forEach { (cat, value) ->
+            angles += cat to (value / total * 360f)
+        }
+    }
+
+    // --- onMeasure (учтены все MeasureSpec) ---
+    override fun onMeasure(w: Int, h: Int) {
+        val size = min(
+            MeasureSpec.getSize(w),
+            MeasureSpec.getSize(h)
+        )
+
+        val finalSize = when {
+            MeasureSpec.getMode(w) == MeasureSpec.EXACTLY -> MeasureSpec.getSize(w)
+            MeasureSpec.getMode(h) == MeasureSpec.EXACTLY -> MeasureSpec.getSize(h)
+            else -> size
+        }
+        setMeasuredDimension(finalSize, finalSize)
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        var startAngle = -90f
+        rect.set(0f, 0f, width.toFloat(), height.toFloat())
+
+        angles.forEachIndexed { i, (cat, sweep) ->
+            paint.color = colors[i % colors.size]
+            canvas.drawArc(rect, startAngle, sweep, true, paint)
+            startAngle += sweep
+        }
+    }
+
+    // --- обработка клика ---
+    override fun onTouchEvent(e: MotionEvent): Boolean {
+        if (e.action != MotionEvent.ACTION_DOWN) return true
+
+        val cx = width / 2f
+        val cy = height / 2f
+        val angle = (Math.toDegrees(
+            atan2(e.y - cy, e.x - cx).toDouble()
+        ) + 360 + 90) % 360
+
+        var acc = 0f
+        for ((cat, sweep) in angles) {
+            acc += sweep
+            if (angle <= acc) {
+                listener?.onCategoryClick(cat)
+                break
+            }
+        }
+        return true
+    }
+
+    // --- сохранение состояния ---
+    override fun onSaveInstanceState(): Parcelable =
+        Bundle().apply {
+            putParcelable("super", super.onSaveInstanceState())
+            putSerializable("data", HashMap(data))
+        }
+
+    override fun onRestoreInstanceState(state: Parcelable) {
+        val b = state as Bundle
+        super.onRestoreInstanceState(b.getParcelable("super"))
+        data = (b.getSerializable("data") as HashMap<String, Float>)
+        calculateAngles()
+    }
+}
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 79ae6993..db225aad 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -7,13 +7,13 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
+    <otus.homework.customview.PieChartView
+        android:id="@+id/pieChart"
+        android:layout_width="300dp"
+        android:layout_height="300dp"
+        app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
 
-</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/art/Screenshot_20260202_230456.png b/art/Screenshot_20260202_230456.png
new file mode 100644
index 00000000..43e0abd8
Binary files /dev/null and b/art/Screenshot_20260202_230456.png differ