дз custom view #119
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,11 +1,62 @@ | ||
| package otus.homework.customview | ||
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| import android.os.Bundle | ||
| import android.widget.Toast | ||
| import androidx.appcompat.app.AppCompatActivity | ||
| import com.google.gson.Gson | ||
| import com.google.gson.reflect.TypeToken | ||
| import otus.homework.customview.databinding.ActivityMainBinding | ||
| import otus.homework.customview.view.PieChartView | ||
| import android.graphics.Color | ||
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| class MainActivity : AppCompatActivity() { | ||
| private lateinit var binding: ActivityMainBinding | ||
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| override fun onCreate(savedInstanceState: Bundle?) { | ||
| super.onCreate(savedInstanceState) | ||
| binding = ActivityMainBinding.inflate(layoutInflater) | ||
| setContentView(binding.root) | ||
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| val data = loadExpenses() | ||
| initPieChartView(data) | ||
| initLineChartView(data) | ||
| } | ||
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| private fun loadExpenses(): List<PriceData> { | ||
| val json = resources.openRawResource(R.raw.payload) | ||
| .bufferedReader() | ||
| .use { it.readText() } | ||
| val type = object : TypeToken<List<PriceData>>() {}.type | ||
| return Gson().fromJson(json, type) | ||
| } | ||
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| private fun initLineChartView(data: List<PriceData>) { | ||
| binding.lineChart.setData(data, getColorsForGradient()) | ||
| } | ||
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| private fun initPieChartView(data: List<PriceData>) { | ||
| binding.pieChart.setData(data, getColorsForGradient()) | ||
| binding.pieChart.applyCallback(object : PieChartView.Callback { | ||
| override fun onSectorClick(priceData: PriceData) { | ||
| Toast.makeText( | ||
| this@MainActivity, | ||
| "${priceData.name} - ${priceData.amount} USD", | ||
| Toast.LENGTH_SHORT | ||
| ).show() | ||
| } | ||
| }) | ||
| } | ||
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| private fun getColorsForGradient() = listOf( | ||
| Color.RED to Color.rgb(255, 165, 0), | ||
| Color.BLUE to Color.CYAN, | ||
| Color.rgb(138, 43, 226) to Color.rgb(255, 105, 180), | ||
| Color.GREEN to Color.rgb(50, 205, 50), | ||
| Color.YELLOW to Color.rgb(255, 215, 0), | ||
| Color.rgb(255, 0, 0) to Color.rgb(255, 182, 193), | ||
| Color.rgb(64, 224, 208) to Color.rgb(0, 191, 255), | ||
| Color.BLACK to Color.rgb(169, 169, 169), | ||
| Color.rgb(0, 0, 139) to Color.rgb(135, 206, 250), | ||
| Color.rgb(128, 0, 128) to Color.rgb(230, 230, 250) | ||
| ).shuffled() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| package otus.homework.customview | ||
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| data class PriceData( | ||
| val id: Long, | ||
| val name: String, | ||
| val amount: Long, | ||
| val category: String, | ||
| val time: Long, | ||
| ) |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,202 @@ | ||
| package otus.homework.customview.view | ||
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| import android.content.Context | ||
| import android.graphics.Canvas | ||
| import android.graphics.Color | ||
| import android.graphics.Paint | ||
| import android.graphics.Path | ||
| import android.os.Bundle | ||
| import android.os.Parcelable | ||
| import android.util.AttributeSet | ||
| import android.view.View | ||
| import otus.homework.customview.PriceData | ||
| import java.text.SimpleDateFormat | ||
| import java.util.Date | ||
| import java.util.Locale | ||
| import androidx.core.graphics.toColorInt | ||
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| class CategoryChartView @JvmOverloads constructor( | ||
| context: Context, | ||
| attrs: AttributeSet? = null, | ||
| defStyleAttr: Int = 0 | ||
| ) : View(context, attrs, defStyleAttr) { | ||
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| private val paint = Paint(Paint.ANTI_ALIAS_FLAG).apply { | ||
| color = "#9C27B0".toColorInt() | ||
| strokeWidth = 4f | ||
| style = Paint.Style.STROKE | ||
| } | ||
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| private val fillPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply { | ||
| color = "#9C27B0".toColorInt() | ||
| alpha = 50 | ||
| style = Paint.Style.FILL | ||
| } | ||
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| private val textPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply { | ||
| color = Color.BLACK | ||
| textSize = 30f | ||
| textAlign = Paint.Align.CENTER | ||
| } | ||
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| private val axisLinePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply { | ||
| color = Color.GRAY | ||
| strokeWidth = 2f | ||
| } | ||
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| private var data: List<PriceData> = listOf() | ||
| private var category: String = "" | ||
| private var maxAmount = 0.0 | ||
| private var dateFormat = SimpleDateFormat("dd.MM", Locale.getDefault()) | ||
| private var chartPath = Path() | ||
| private var fillPath = Path() | ||
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| private var paddingHorizontal = 100f | ||
| private var paddingVertical = 100f | ||
| private var chartWidth = 0f | ||
| private var chartHeight = 0f | ||
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| fun setData(newData: List<PriceData>, category: String) { | ||
| this.data = newData.filter { it.category == category } | ||
| this.category = category | ||
| calculateChartDimensions() | ||
| invalidate() | ||
| } | ||
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| private fun calculateChartDimensions() { | ||
| if (data.isEmpty()) return | ||
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| maxAmount = data.groupBy { it.time * 1000L } | ||
| .mapValues { it.value.sumOf { expense -> expense.amount } } | ||
| .maxOf { it.value }.toDouble() | ||
| } | ||
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| override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) { | ||
| val desiredWidth = suggestedMinimumWidth + paddingLeft + paddingRight | ||
| val desiredHeight = suggestedMinimumHeight + paddingTop + paddingBottom | ||
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| val width = resolveSize(desiredWidth, widthMeasureSpec) | ||
| val height = resolveSize(desiredHeight, heightMeasureSpec) | ||
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| setMeasuredDimension(width, height) | ||
| } | ||
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| override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) { | ||
| super.onSizeChanged(w, h, oldw, oldh) | ||
| chartWidth = w - 2 * paddingHorizontal | ||
| chartHeight = h - 2 * paddingVertical | ||
| } | ||
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| override fun onDraw(canvas: Canvas) { | ||
| super.onDraw(canvas) | ||
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| if (data.isEmpty()) return | ||
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| canvas.drawLine( | ||
| paddingHorizontal, | ||
| height - paddingVertical, | ||
| width - paddingHorizontal, | ||
| height - paddingVertical, | ||
| axisLinePaint | ||
| ) | ||
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| canvas.drawLine( | ||
| paddingHorizontal, | ||
| paddingVertical, | ||
| paddingHorizontal, | ||
| height - paddingVertical, | ||
| axisLinePaint | ||
| ) | ||
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| val dailyExpenses = data.groupBy { it.time * 1000L } | ||
| .mapValues { it.value.sumOf { expense -> expense.amount } } | ||
| .toSortedMap() | ||
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| if (dailyExpenses.isEmpty()) return | ||
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| val timeRange = dailyExpenses.lastKey() - dailyExpenses.firstKey() | ||
| val xScale = chartWidth / timeRange | ||
| val yScale = chartHeight / maxAmount | ||
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| chartPath.reset() | ||
| fillPath.reset() | ||
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| var isFirst = true | ||
| dailyExpenses.forEach { (time, amount) -> | ||
| val x = paddingHorizontal + (time - dailyExpenses.firstKey()) * xScale | ||
| val y = height - paddingVertical - (amount * yScale).toFloat() | ||
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| if (isFirst) { | ||
| chartPath.moveTo(x, y) | ||
| fillPath.moveTo(x, height - paddingVertical) | ||
| fillPath.lineTo(x, y) | ||
| isFirst = false | ||
| } else { | ||
| chartPath.lineTo(x, y) | ||
| fillPath.lineTo(x, y) | ||
| } | ||
| } | ||
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| fillPath.lineTo( | ||
| paddingHorizontal + chartWidth, | ||
| height - paddingVertical | ||
| ) | ||
| fillPath.close() | ||
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| canvas.drawPath(fillPath, fillPaint) | ||
| canvas.drawPath(chartPath, paint) | ||
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| val dateStep = timeRange / 5 | ||
| for (i in 0..5) { | ||
| val time = dailyExpenses.firstKey() + dateStep * i | ||
| val x = paddingHorizontal + (time - dailyExpenses.firstKey()) * xScale | ||
| val date = Date(time) | ||
|
Contributor
There was a problem hiding this comment. Каждая итерация создаёт объект Date. Это тоже плохо. В onDraw нельзя создавать новые объекты. |
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| canvas.drawText( | ||
| dateFormat.format(date), | ||
| x, | ||
| height - paddingVertical + 40, | ||
| textPaint | ||
| ) | ||
| } | ||
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| val amountStep = maxAmount / 5 | ||
| for (i in 0..5) { | ||
| val amount = amountStep * i | ||
| val y = height - paddingVertical - (amount * yScale).toFloat() | ||
| canvas.drawText( | ||
| String.format("%.0f", amount), | ||
| paddingHorizontal - 40, | ||
| y + textPaint.textSize/2, | ||
| textPaint | ||
| ) | ||
| } | ||
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| textPaint.textSize = 40f | ||
| canvas.drawText( | ||
| category, | ||
| width / 2f, | ||
| paddingVertical - 40, | ||
| textPaint | ||
| ) | ||
| } | ||
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| override fun onSaveInstanceState(): Parcelable { | ||
| val bundle = Bundle() | ||
| bundle.putParcelable("superState", super.onSaveInstanceState()) | ||
| bundle.putString("category", category) | ||
| bundle.putFloat("chartWidth", chartWidth) | ||
| bundle.putFloat("chartHeight", chartHeight) | ||
| return bundle | ||
| } | ||
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| override fun onRestoreInstanceState(state: Parcelable?) { | ||
| if (state is Bundle) { | ||
| category = state.getString("category", "") | ||
| chartWidth = state.getFloat("chartWidth") | ||
| chartHeight = state.getFloat("chartHeight") | ||
| super.onRestoreInstanceState(state.getParcelable("superState")) | ||
| } else { | ||
| super.onRestoreInstanceState(state) | ||
| } | ||
| } | ||
| } | ||
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Каждый вызов groupBy, mapValues и toSortedMap создаёт новые коллекции. Лучше выносить эту логику из onDraw в setData