How to Overlay drawing on CameraX display.

[Rob]

Hi All,

We are trying to figure out how to overlay drawing ON the PreviewView on which the Camerax is displayed. We already know where the face is located so we don't

need to use Firebase to get that information. We tried placing an ImageView over the PreviewView and creating a transparent bitmap displayed in the ImageView.

We did this with Camera1 and Camera2 using a TextureView, for the camera display and ImageView for drawing but are having difficulty with CameraX.

Does anyone have a sample, preferable in Java, but anything is fine or idea if this is the correct approach.  We have seen a few, but they are done with the pre alpha07 update.

<ImageView

    android:id="@+id/overlayView"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:visibility="visible" />

<androidx.camera.view.PreviewView

    android:id="@+id/view_finder"

    android:layout_width="match_parent"

    android:layout_height="match_parent" />

Thanks,

Rob

[Scott Nien]

Hi Rob, 

Can you try to swap the order of <ImageView> and <PreviewView> ?   Does it fix the problem ? 

Scott

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[adnan ganie]

yes, we can but using constraintLayout

<ImageView

app:layout_constraintEnd_toEndOf="view_finder"
app:layout_constraintStart_toStartOf="view_finder"
app:layout_constraintTop_toTopOf="view_finder"
app:layout_constraintBottom_BottomOf="view_finder"

   android:id="@+id/overlayView"

   android:layout_width="match_parent"

   android:layout_height="match_parent"

   android:visibility="visible" />

<androidx.camera.view.PreviewView

   android:id="@+id/view_finder"

   android:layout_width="match_parent"

   android:layout_height="match_parent" />

[Rob]

Yes that did help.  We tried so many things, I'm sure we tried that, but we must have had other issues and never flipped it back.

Thanks,

Rob

On Friday, June 19, 2020 at 10:16:07 PM UTC-4, Scott Nien wrote:

Hi Rob, 

Can you try to swap the order of <ImageView> and <PreviewView> ?   Does it fix the problem ? 

Scott

On Fri, Jun 19, 2020 at 8:28 PM Rob <r9o...@gmail.com> wrote:

Hi All,

We are trying to figure out how to overlay drawing ON the PreviewView on which the Camerax is displayed. We already know where the face is located so we don't

need to use Firebase to get that information. We tried placing an ImageView over the PreviewView and creating a transparent bitmap displayed in the ImageView.

We did this with Camera1 and Camera2 using a TextureView, for the camera display and ImageView for drawing but are having difficulty with CameraX.

Does anyone have a sample, preferable in Java, but anything is fine or idea if this is the correct approach.  We have seen a few, but they are done with the pre alpha07 update.

<ImageView

    android:id="@+id/overlayView"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:visibility="visible" />

<androidx.camera.view.PreviewView

    android:id="@+id/view_finder"

    android:layout_width="match_parent"

    android:layout_height="match_parent" />

Thanks,

Rob

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[Scott Nien]

Hi Rob, 
What are the specific issues when you try to place an ImageView on top of a PreviewView ?  

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