125 lines
3.6 KiB
Markdown
125 lines
3.6 KiB
Markdown
# ✅ Fix: History Screen Close App Issue
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## 📋 Problem Identified
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**Issue**: App crash ketika membuka riwayat absensi (History Screen)
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### Root Causes:
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1. **Missing null/empty string checks** - Field seperti `nama`, `npm`, `mataPelajaran`, `message` dapat kosong atau null, menyebabkan rendering error
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2. **No exception handling** - Tidak ada try-catch wrapper di `AttendanceCard` composable
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3. **Date formatting error** - `dateFormatter.format()` bisa throw exception jika timestamp invalid
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## 🔧 Solutions Applied
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### 1. **Wrapped AttendanceCard dengan Try-Catch**
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```kotlin
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@Composable
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fun AttendanceCard(
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attendance: Attendance,
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dateFormatter: SimpleDateFormat
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) {
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try {
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// ... semua logika rendering ...
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} catch (e: Exception) {
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// Fallback UI menampilkan error message
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Card(
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modifier = Modifier.fillMaxWidth(),
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colors = CardDefaults.cardColors(
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containerColor = MaterialTheme.colorScheme.errorContainer
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)
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) {
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Column(...) {
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Text("Error menampilkan data absensi")
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Text(e.message ?: "Unknown error")
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}
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}
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}
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}
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```
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### 2. **Added Null/Empty Safety Checks**
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```kotlin
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// Sebelum:
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Text(text = attendance.nama) // ❌ Crash jika kosong
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// Sesudah:
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Text(text = attendance.nama.takeIf { it.isNotEmpty() } ?: "N/A") // ✅ Safe
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Text(text = attendance.mataPelajaran.takeIf { it.isNotEmpty() } ?: "-") // ✅ Safe
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Text(text = attendance.npm.takeIf { it.isNotEmpty() } ?: "N/A") // ✅ Safe
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```
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### 3. **Protected Date Formatting**
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```kotlin
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// Sebelum:
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Text(text = "📅 ${dateFormatter.format(Date(attendance.timestamp))}") // ❌ Can crash
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// Sesudah:
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try {
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Text(text = "📅 ${dateFormatter.format(Date(attendance.timestamp))}")
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} catch (e: Exception) {
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Text(text = "📅 ${attendance.timestamp}") // Fallback ke raw timestamp
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}
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```
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### 4. **Protected Distance Calculation**
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```kotlin
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val (distanceFromCampus, isWithinRadius) = try {
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if (attendance.latitude.isFinite() && attendance.longitude.isFinite()) {
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val distance = calculateDistance(...)
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Pair(distance, distance <= AppConfig.ATTENDANCE_RADIUS_METERS)
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} else {
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Pair(0f, false)
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}
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} catch (e: Exception) {
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Pair(0f, false)
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}
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```
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## ✅ Improvements
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| Aspek | Sebelum | Sesudah |
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|-------|---------|--------|
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| **Null Safety** | ❌ No checks | ✅ All fields safe |
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| **Exception Handling** | ❌ None | ✅ Try-catch with fallback |
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| **Empty String Handling** | ❌ Crashes | ✅ Shows "-" or "N/A" |
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| **Error Display** | ❌ Crash | ✅ Error card shown |
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| **Stability** | ❌ Unstable | ✅ Stable |
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## 🧪 Test Cases
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### Test 1: View History dengan Data Valid
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```
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1. Buka AttendanceScreen
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2. Submit absensi dengan lengkap
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3. Buka History
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✅ Expected: Riwayat ditampilkan dengan sempurna
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```
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### Test 2: View History dengan Data Kosong
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```
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1. Buka History (tanpa submit apapun)
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✅ Expected: Tampilkan "Belum ada riwayat kehadiran"
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```
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### Test 3: View History dengan Data Partial
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```
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1. Submit absensi dengan mataPelajaran kosong
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2. Buka History
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✅ Expected: Tampilkan "-" untuk mata kuliah, tidak crash
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```
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### Test 4: Multiple Records
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```
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1. Submit 5 kali
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2. Buka History
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✅ Expected: Semua 5 record ditampilkan, sorted by timestamp DESC
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```
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## 📝 Files Modified
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- `presentation/screens/HistoryScreen.kt` - Added comprehensive error handling
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## 🚀 Expected Result
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✅ App tidak lagi crash ketika membuka History Screen
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✅ Menampilkan error message yang user-friendly jika ada data issue
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✅ Graceful fallback untuk berbagai edge cases
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