Prevent crash on devices with camera killswitches.

Addresses #13450.

app/src/main/java/org/thoughtcrime/securesms/mediasend/CameraXFragment.java

@@ -377,10 +377,14 @@ public class CameraXFragment extends LoggingFragment implements CameraFragment {
     selfieFlash = requireView().findViewById(R.id.camera_selfie_flash);
 
     captureButton.setOnClickListener(v -> {
+      if (cameraController.isInitialized()) {
         captureButton.setEnabled(false);
         flipButton.setEnabled(false);
         flashButton.setEnabled(false);
         onCaptureClicked();
+      } else {
+        Log.i(TAG, "Camera capture button clicked but the camera controller is not yet initialized.");
+      }
     });
 
     previewView.setScaleType(PREVIEW_SCALE_TYPE);

app/src/main/java/org/thoughtcrime/securesms/mediasend/camerax/CameraXController.kt

@@ -27,6 +27,8 @@ import java.util.concurrent.Executor
 
 interface CameraXController {
 
+  fun isInitialized(): Boolean
+
   fun initializeAndBind(context: Context, lifecycleOwner: LifecycleOwner)
 
   @RequiresPermission(Manifest.permission.CAMERA)

app/src/main/java/org/thoughtcrime/securesms/mediasend/camerax/PlatformCameraController.kt

@@ -31,6 +31,10 @@ import java.util.concurrent.Executor
 class PlatformCameraController(context: Context) : CameraXController {
   val delegate = LifecycleCameraController(context)
 
+  override fun isInitialized(): Boolean {
+    return delegate.initializationFuture.isDone
+  }
+
   override fun initializeAndBind(context: Context, lifecycleOwner: LifecycleOwner) {
     delegate.bindToLifecycle(lifecycleOwner)
     delegate.setCameraSelector(CameraXUtil.toCameraSelector(TextSecurePreferences.getDirectCaptureCameraId(context)))

app/src/main/java/org/thoughtcrime/securesms/mediasend/camerax/SignalCameraController.kt

@@ -110,6 +110,10 @@ class SignalCameraController(
   private lateinit var extensionsManager: ExtensionsManager
   private lateinit var cameraProperty: Camera
 
+  override fun isInitialized(): Boolean {
+    return this::cameraProvider.isInitialized && this::extensionsManager.isInitialized
+  }
+
   override fun initializeAndBind(context: Context, lifecycleOwner: LifecycleOwner) {
     bindToLifecycle(lifecycleOwner) { Log.d(TAG, "Camera initialization and binding complete.") }
   }
@@ -117,7 +121,7 @@ class SignalCameraController(
   @RequiresPermission(Manifest.permission.CAMERA)
   override fun bindToLifecycle(lifecycleOwner: LifecycleOwner, onCameraBoundListener: Runnable) {
     ThreadUtil.assertMainThread()
-    if (this::cameraProvider.isInitialized && this::extensionsManager.isInitialized) {
+    if (isInitialized()) {
       bindToLifecycleInternal()
       onCameraBoundListener.run()
     } else if (!listenerAdded) {