android: add in-chat circle recorder with live camera preview

android/app/build.gradle.kts

@@ -106,6 +106,11 @@ dependencies {
     implementation("androidx.media3:media3-exoplayer:1.4.1")
     implementation("androidx.media3:media3-datasource:1.4.1")
     implementation("androidx.media3:media3-datasource-okhttp:1.4.1")
+    implementation("androidx.camera:camera-core:1.4.2")
+    implementation("androidx.camera:camera-camera2:1.4.2")
+    implementation("androidx.camera:camera-lifecycle:1.4.2")
+    implementation("androidx.camera:camera-video:1.4.2")
+    implementation("androidx.camera:camera-view:1.4.2")
 
     implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.9.0")
     implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.7.3")

android/app/src/main/java/ru/daemonlord/messenger/ui/chat/ChatScreen.kt

@@ -115,6 +115,7 @@ import androidx.compose.ui.layout.onSizeChanged
 import androidx.annotation.StringRes
 import androidx.hilt.navigation.compose.hiltViewModel
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import androidx.lifecycle.compose.LocalLifecycleOwner
 import androidx.core.content.ContextCompat
 import androidx.core.content.FileProvider
 import androidx.core.view.WindowCompat
@@ -183,6 +184,19 @@ import java.util.Locale
 import java.net.URLEncoder
 import kotlinx.coroutines.delay
 import kotlin.math.roundToInt
+import androidx.camera.core.CameraSelector
+import androidx.camera.core.Preview
+import androidx.camera.lifecycle.ProcessCameraProvider
+import androidx.camera.video.FileOutputOptions
+import androidx.camera.video.PendingRecording
+import androidx.camera.video.Quality
+import androidx.camera.video.QualitySelector
+import androidx.camera.video.Recorder
+import androidx.camera.video.Recording
+import androidx.camera.video.VideoCapture
+import androidx.camera.video.VideoRecordEvent
+import androidx.camera.view.PreviewView
+import androidx.compose.ui.window.Dialog
 
 @Composable
 fun ChatRoute(
@@ -191,7 +205,9 @@ fun ChatRoute(
 ) {
     val state by viewModel.uiState.collectAsStateWithLifecycle()
     val context = LocalContext.current
+    val lifecycleOwner = LocalLifecycleOwner.current
     val voiceRecorder = remember(context) { VoiceRecorder(context) }
+    var showCircleRecorder by remember { mutableStateOf(false) }
     var hasAudioPermission by remember {
         mutableStateOf(
             ContextCompat.checkSelfPermission(
@@ -200,7 +216,16 @@ fun ChatRoute(
             ) == PackageManager.PERMISSION_GRANTED
         )
     }
+    var hasCameraPermission by remember {
+        mutableStateOf(
+            ContextCompat.checkSelfPermission(
+                context,
+                Manifest.permission.CAMERA,
+            ) == PackageManager.PERMISSION_GRANTED
+        )
+    }
     var startRecordingAfterPermissionGrant by remember { mutableStateOf(false) }
+    var openCircleAfterPermissionGrant by remember { mutableStateOf(false) }
     val startVoiceRecording: () -> Unit = {
         val started = voiceRecorder.start()
         if (started) {
@@ -219,6 +244,18 @@ fun ChatRoute(
         }
         startRecordingAfterPermissionGrant = false
     }
+    val circlePermissionLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.RequestMultiplePermissions(),
+    ) { grants ->
+        hasCameraPermission = grants[Manifest.permission.CAMERA] == true ||
+            ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED
+        hasAudioPermission = grants[Manifest.permission.RECORD_AUDIO] == true ||
+            ContextCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) == PackageManager.PERMISSION_GRANTED
+        if (hasCameraPermission && openCircleAfterPermissionGrant) {
+            showCircleRecorder = true
+        }
+        openCircleAfterPermissionGrant = false
+    }
     DisposableEffect(voiceRecorder) {
         onDispose {
             voiceRecorder.cancel()
@@ -247,26 +284,18 @@ fun ChatRoute(
     }
     var pendingCaptureVideoUri by remember { mutableStateOf<Uri?>(null) }
     var pendingCaptureVideoFile by remember { mutableStateOf<File?>(null) }
-    var pendingCaptureCircle by remember { mutableStateOf(false) }
     val captureVideoLauncher = rememberLauncherForActivityResult(
         contract = ActivityResultContracts.CaptureVideo(),
     ) { success ->
         val uri = pendingCaptureVideoUri
         val file = pendingCaptureVideoFile
-        val asCircle = pendingCaptureCircle
         pendingCaptureVideoUri = null
         pendingCaptureVideoFile = null
-        pendingCaptureCircle = false
         if (success && uri != null) {
             val picked = uri.readMediaPayload(context)
             if (picked != null) {
-                val fileName = if (asCircle) {
-                    "circle_${System.currentTimeMillis()}.mp4"
-                } else {
-                    "camera_video_${System.currentTimeMillis()}.mp4"
-                }
                 viewModel.onMediaPicked(
-                    fileName = fileName,
+                    fileName = "camera_video_${System.currentTimeMillis()}.mp4",
                     mimeType = if (picked.mimeType.startsWith("video/")) picked.mimeType else "video/mp4",
                     bytes = picked.bytes,
                 )
@@ -302,22 +331,22 @@ fun ChatRoute(
                 "${context.packageName}.fileprovider",
                 file,
             )
-            pendingCaptureCircle = false
             pendingCaptureVideoFile = file
             pendingCaptureVideoUri = uri
             captureVideoLauncher.launch(uri)
         },
         onCaptureCircleVideo = {
-            val file = createTempCaptureFile(context = context, prefix = "circle_", suffix = ".mp4")
-            val uri = FileProvider.getUriForFile(
-                context,
-                "${context.packageName}.fileprovider",
-                file,
-            )
-            pendingCaptureCircle = true
-            pendingCaptureVideoFile = file
-            pendingCaptureVideoUri = uri
-            captureVideoLauncher.launch(uri)
+            if (hasCameraPermission) {
+                showCircleRecorder = true
+            } else {
+                openCircleAfterPermissionGrant = true
+                circlePermissionLauncher.launch(
+                    arrayOf(
+                        Manifest.permission.CAMERA,
+                        Manifest.permission.RECORD_AUDIO,
+                    ),
+                )
+            }
         },
         onSendRemoteMedia = { fileName, mimeType, bytes ->
             viewModel.onMediaPicked(
@@ -372,6 +401,20 @@ fun ChatRoute(
         onTransferOwnership = viewModel::transferOwnership,
         onUnbanMember = viewModel::unbanMember,
     )
+    if (showCircleRecorder) {
+        CircleVideoRecorderDialog(
+            lifecycleOwner = lifecycleOwner,
+            onDismiss = { showCircleRecorder = false },
+            onSend = { payload ->
+                viewModel.onMediaPicked(
+                    fileName = payload.fileName,
+                    mimeType = payload.mimeType,
+                    bytes = payload.bytes,
+                )
+                showCircleRecorder = false
+            },
+        )
+    }
 }
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -2234,6 +2277,266 @@ private data class PickedMediaPayload(
     val bytes: ByteArray,
 )
 
+private enum class CircleFinalizeAction {
+    Send,
+    Cancel,
+}
+
+@Composable
+private fun CircleVideoRecorderDialog(
+    lifecycleOwner: androidx.lifecycle.LifecycleOwner,
+    onDismiss: () -> Unit,
+    onSend: (PickedMediaPayload) -> Unit,
+) {
+    val context = LocalContext.current
+    val mainExecutor = remember(context) { ContextCompat.getMainExecutor(context) }
+    val previewView = remember {
+        PreviewView(context).apply {
+            implementationMode = PreviewView.ImplementationMode.COMPATIBLE
+            scaleType = PreviewView.ScaleType.FILL_CENTER
+        }
+    }
+    var videoCapture by remember { mutableStateOf<VideoCapture<Recorder>?>(null) }
+    var activeRecording by remember { mutableStateOf<Recording?>(null) }
+    var activeFile by remember { mutableStateOf<File?>(null) }
+    var isRecording by remember { mutableStateOf(false) }
+    var isLocked by remember { mutableStateOf(false) }
+    var durationMs by remember { mutableStateOf(0L) }
+    var finalizeAction by remember { mutableStateOf<CircleFinalizeAction?>(null) }
+
+    LaunchedEffect(isRecording) {
+        while (isRecording) {
+            delay(100L)
+            durationMs += 100L
+        }
+    }
+
+    DisposableEffect(lifecycleOwner, previewView) {
+        val cameraProviderFuture = ProcessCameraProvider.getInstance(context)
+        val listener = Runnable {
+            val provider = runCatching { cameraProviderFuture.get() }.getOrNull() ?: return@Runnable
+            val preview = Preview.Builder().build().apply {
+                setSurfaceProvider(previewView.surfaceProvider)
+            }
+            val recorder = Recorder.Builder()
+                .setQualitySelector(QualitySelector.from(Quality.SD))
+                .build()
+            val capture = VideoCapture.withOutput(recorder)
+            runCatching {
+                provider.unbindAll()
+                provider.bindToLifecycle(
+                    lifecycleOwner,
+                    CameraSelector.DEFAULT_FRONT_CAMERA,
+                    preview,
+                    capture,
+                )
+                videoCapture = capture
+            }
+        }
+        cameraProviderFuture.addListener(listener, mainExecutor)
+        onDispose {
+            runCatching { activeRecording?.stop() }
+            activeRecording = null
+            isRecording = false
+            val provider = runCatching { cameraProviderFuture.get() }.getOrNull()
+            runCatching { provider?.unbindAll() }
+            runCatching { activeFile?.delete() }
+            activeFile = null
+        }
+    }
+
+    fun stopWith(action: CircleFinalizeAction) {
+        val recording = activeRecording ?: return
+        finalizeAction = action
+        recording.stop()
+        activeRecording = null
+        isRecording = false
+    }
+
+    fun startRecording() {
+        if (isRecording) return
+        val capture = videoCapture ?: return
+        val file = createTempCaptureFile(context = context, prefix = "circle_", suffix = ".mp4")
+        activeFile = file
+        durationMs = 0L
+        isLocked = false
+        val output = FileOutputOptions.Builder(file).build()
+        var pending = capture.output.prepareRecording(context, output)
+        if (
+            ContextCompat.checkSelfPermission(context, Manifest.permission.RECORD_AUDIO) ==
+            PackageManager.PERMISSION_GRANTED
+        ) {
+            pending = pending.withAudioEnabled()
+        }
+        activeRecording = pending.start(mainExecutor) { event ->
+            when (event) {
+                is VideoRecordEvent.Start -> {
+                    isRecording = true
+                }
+                is VideoRecordEvent.Finalize -> {
+                    isRecording = false
+                    val completedFile = activeFile
+                    val action = finalizeAction
+                    finalizeAction = null
+                    activeFile = null
+                    activeRecording = null
+                    val hasError = event.hasError()
+                    if (hasError || completedFile == null || !completedFile.exists()) {
+                        runCatching { completedFile?.delete() }
+                        return@start
+                    }
+                    when (action) {
+                        CircleFinalizeAction.Send -> {
+                            val bytes = runCatching { completedFile.readBytes() }.getOrNull()
+                            if (bytes != null && bytes.isNotEmpty()) {
+                                onSend(
+                                    PickedMediaPayload(
+                                        fileName = "circle_${System.currentTimeMillis()}.mp4",
+                                        mimeType = "video/mp4",
+                                        bytes = bytes,
+                                    ),
+                                )
+                            }
+                            runCatching { completedFile.delete() }
+                            onDismiss()
+                        }
+                        CircleFinalizeAction.Cancel, null -> {
+                            runCatching { completedFile.delete() }
+                        }
+                    }
+                }
+                else -> Unit
+            }
+        }
+    }
+
+    Dialog(onDismissRequest = {
+        if (!isRecording) {
+            onDismiss()
+        } else {
+            stopWith(CircleFinalizeAction.Cancel)
+        }
+    }) {
+        Surface(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(16.dp),
+            shape = RoundedCornerShape(24.dp),
+            color = MaterialTheme.colorScheme.surface,
+        ) {
+            Column(
+                modifier = Modifier
+                    .fillMaxWidth()
+                    .padding(16.dp),
+                horizontalAlignment = Alignment.CenterHorizontally,
+                verticalArrangement = Arrangement.spacedBy(12.dp),
+            ) {
+                Box(
+                    modifier = Modifier
+                        .size(260.dp)
+                        .clip(CircleShape)
+                        .background(Color.Black),
+                ) {
+                    AndroidView(
+                        factory = { previewView },
+                        modifier = Modifier.fillMaxSize(),
+                    )
+                }
+                Text(
+                    text = if (isRecording) "Recording ${formatDuration(durationMs.toInt())}" else "Circle video",
+                    style = MaterialTheme.typography.titleMedium,
+                )
+                if (!isRecording) {
+                    CircleHoldToRecordButton(
+                        onStart = { startRecording() },
+                        onLock = { isLocked = true },
+                        onCancel = { stopWith(CircleFinalizeAction.Cancel) },
+                        onRelease = { stopWith(CircleFinalizeAction.Send) },
+                    )
+                    TextButton(onClick = onDismiss) { Text(stringResource(id = R.string.common_cancel)) }
+                } else {
+                    if (isLocked) {
+                        Row(
+                            modifier = Modifier.fillMaxWidth(),
+                            horizontalArrangement = Arrangement.spacedBy(10.dp, Alignment.CenterHorizontally),
+                        ) {
+                            TextButton(onClick = { stopWith(CircleFinalizeAction.Cancel) }) {
+                                Text(stringResource(id = R.string.common_cancel))
+                            }
+                            Button(onClick = { stopWith(CircleFinalizeAction.Send) }) {
+                                Text(stringResource(id = R.string.common_send))
+                            }
+                        }
+                    } else {
+                        CircleHoldToRecordButton(
+                            onStart = {},
+                            onLock = { isLocked = true },
+                            onCancel = { stopWith(CircleFinalizeAction.Cancel) },
+                            onRelease = { stopWith(CircleFinalizeAction.Send) },
+                        )
+                    }
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun CircleHoldToRecordButton(
+    onStart: () -> Unit,
+    onLock: () -> Unit,
+    onCancel: () -> Unit,
+    onRelease: () -> Unit,
+) {
+    Box(
+        modifier = Modifier
+            .pointerInput(Unit) {
+                awaitEachGesture {
+                    val down = awaitFirstDown(requireUnconsumed = false)
+                    onStart()
+                    var cancelled = false
+                    var locked = false
+                    while (true) {
+                        val event = awaitPointerEvent()
+                        val change = event.changes.first()
+                        val delta = change.position - down.position
+                        if (!locked && delta.y < -120f) {
+                            locked = true
+                            onLock()
+                            break
+                        }
+                        if (!locked && delta.x < -150f) {
+                            cancelled = true
+                            onCancel()
+                            break
+                        }
+                        if (!change.pressed) {
+                            if (!cancelled && !locked) onRelease()
+                            break
+                        }
+                        if (change.positionChange() != Offset.Zero) {
+                            change.consume()
+                        }
+                    }
+                }
+            },
+    ) {
+        Surface(
+            shape = CircleShape,
+            color = MaterialTheme.colorScheme.primary.copy(alpha = 0.18f),
+        ) {
+            Row(
+                modifier = Modifier.padding(horizontal = 20.dp, vertical = 10.dp),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(8.dp),
+            ) {
+                Icon(imageVector = Icons.Filled.RadioButtonChecked, contentDescription = null)
+                Text("Slide up to lock, left to cancel")
+            }
+        }
+    }
+}
+
 private fun Bitmap.toJpegPayload(quality: Int = 92): PickedMediaPayload? {
     val stream = java.io.ByteArrayOutputStream()
     val ok = compress(Bitmap.CompressFormat.JPEG, quality.coerceIn(1, 100), stream)