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MainActivity.kt
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MainActivity.kt
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package com.github.kpdandroid
import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.util.Log
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.result.contract.ActivityResultContracts
import androidx.activity.viewModels
import androidx.compose.material.MaterialTheme
import androidx.compose.runtime.LaunchedEffect
import androidx.core.content.ContextCompat
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleEventObserver
import androidx.lifecycle.LifecycleOwner
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.composable
import androidx.navigation.compose.rememberNavController
import com.github.kpdandroid.ui.screens.CameraAnalysisScreen
import com.github.kpdandroid.ui.screens.FileAnalysisScreen
import com.github.kpdandroid.ui.screens.MAIN_SCREEN
import com.github.kpdandroid.ui.screens.NavDestination
import com.github.kpdandroid.ui.screens.NavScreen
import com.github.kpdandroid.ui.theme.KeypointDetectAppTheme
import com.github.kpdandroid.ui.viewmodels.CameraAnalysisViewModel
import com.github.kpdandroid.ui.viewmodels.FileAnalysisViewModel
import com.github.kpdandroid.utils.PreferencesManager
import com.github.kpdandroid.utils.camera.CameraHandler
private const val TAG = "MainActivity"
class MainActivity : ComponentActivity() {
private lateinit var prefs: PreferencesManager
private lateinit var cameraHandler: CameraHandler
private val fileViewModel by viewModels<FileAnalysisViewModel>()
private val cameraViewModel by viewModels<CameraAnalysisViewModel>()
private val cameraPermissionRequest =
registerForActivityResult(ActivityResultContracts.RequestPermission()) { granted ->
if (granted) {
Log.i(TAG, "Camera permission was granted.")
// In Android Q and later permission window triggers onTopResumedActivityChanged()
if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.Q) {
tryStartCameraAnalysisIfNeeded()
}
} else {
Log.e(TAG, "Camera permission was NOT granted.")
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
prefs = (application as KeypointDetectApp).prefs
cameraHandler = CameraHandler(this, cameraViewModel.analyzer)
setContent {
KeypointDetectAppTheme {
val navController = rememberNavController()
fileViewModel.keypointColor = MaterialTheme.colors.primary
cameraViewModel.keypointColor = MaterialTheme.colors.primary
NavHost(navController = navController, startDestination = MAIN_SCREEN) {
composable(MAIN_SCREEN) { NavScreen { navController.navigate(it.name) } }
composable(NavDestination.FILE_ANALYSIS.name) {
FileAnalysisScreen(fileViewModel)
}
composable(NavDestination.CAMERA_ANALYSIS.name) { backStackEntry ->
LaunchedEffect(backStackEntry) {
tieCameraLifecycleTo(backStackEntry)
tryStartCameraAnalysisIfNeeded()
}
CameraAnalysisScreen(
vm = cameraViewModel,
supportedResolutions =
cameraHandler.supportedResolutions.map { it.toString() },
onResolutionSelected = this@MainActivity::tryStartCameraAnalysis
)
}
}
}
}
}
private fun tieCameraLifecycleTo(owner: LifecycleOwner) {
Log.i(TAG, "Tying camera lifecycle to $owner.")
if (cameraHandler.isAnalyzing()) {
Log.d(TAG, "Stopping image analysis first.")
cameraHandler.stopImageAnalysis()
}
cameraHandler.tieCameraLifecycleIfNeededTo(
owner.apply {
lifecycle.addObserver(
{ owner: LifecycleOwner, event: Lifecycle.Event ->
if (event == Lifecycle.Event.ON_DESTROY) {
Log.i(TAG, "Untying camera lifecycle from $owner.")
cameraHandler.untieCameraLifecycleIfNeededFrom(owner)
}
} as LifecycleEventObserver
)
}
)
}
private fun tryStartCameraAnalysisIfNeeded() {
if (cameraHandler.run { isCameraLifecycleTied && !isAnalyzing() }) tryStartCameraAnalysis()
}
private fun tryStartCameraAnalysis() {
val isCameraPermissionGranted = isPermissionGranted(Manifest.permission.CAMERA)
cameraViewModel.isCameraPermissionGranted = isCameraPermissionGranted
Log.i(
TAG,
"Trying to start camera analysis (permissions granted: $isCameraPermissionGranted)."
)
when {
isCameraPermissionGranted -> cameraHandler.startImageAnalysis(
targetResolution = prefs.resolution,
callback = prefs::resolution::set
)
shouldRationalize(Manifest.permission.CAMERA) -> Toast.makeText(
this,
"Camera permission is required for camera analysis.",
Toast.LENGTH_SHORT
).show()
else -> cameraPermissionRequest.launch(Manifest.permission.CAMERA)
}
}
private fun isPermissionGranted(permission: String) =
ContextCompat.checkSelfPermission(this, permission) == PackageManager.PERMISSION_GRANTED
private fun shouldRationalize(permission: String) =
(android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) &&
shouldShowRequestPermissionRationale(permission)
// Not using onResume to account for changes made in split screen
override fun onTopResumedActivityChanged(isTopResumedActivity: Boolean) {
if (isTopResumedActivity) tryStartCameraAnalysisIfNeeded()
}
override fun onDestroy() {
cameraHandler.shutdown()
super.onDestroy()
}
}