Customize android camera view layout

I'm developing an app that will use the android API camera. However, I will use the camera only for the user to see certain points on a target, ie, it is not necessary to capture photos or videos. The idea is to create a VISUALIZATION DISPLAY .

With the XML layout and the following code I was able to instantiate and display the camera in MainActivity:

XML:

<FrameLayout
    android:id="@+id/frameLayoutCamera"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

CLASS MAIN ACTIVITY:

public class MainActivity extends AppCompatActivity {

//Atributos para trabalhar com a camera
private Camera camera;
private FrameLayout frameLayout;
private ShowCamera showCamera;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    this.frameLayout = (FrameLayout) findViewById(R.id.frameLayoutCamera);

    this.camera = Camera.open();
    this.showCamera = new ShowCamera(this, camera);//instanciando a classe showCamera
    this.frameLayout.addView(showCamera);
}

@Override
protected void onPause() {
    super.onPause();
    if (camera != null) {
        camera.stopPreview();
        camera.release();
        camera = null;
    }
}

}

CLASS SHOWCAMERA:

public class ShowCamera extends SurfaceView implements SurfaceHolder.Callback {

private Camera camera;
private SurfaceHolder holder;

public ShowCamera(Context context, Camera camera) {
    super(context);

    this.camera = camera;
    this.holder = getHolder();
    this.holder.addCallback(this);
}

@Override
public void surfaceCreated(SurfaceHolder holder) {
    Camera.Parameters parameters = this.camera.getParameters();
    if (this.getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE){
        parameters.set("orientation", "portrait");
        this.camera.setDisplayOrientation(90);
        parameters.setRotation(90);
    }else {
        parameters.set("orientation", "landscape");
        this.camera.setDisplayOrientation(0);
        parameters.setRotation(0);
    }

    this.camera.setParameters(parameters);

    try {
        this.camera.setPreviewDisplay(holder);
        this.camera.startPreview();
    }catch (IOException e){
        e.printStackTrace();
    }
}

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {

}

}

With the implementations above, I was able to display the camera on the Smartphone screen according to the demo image below:

ButIwantedtostylizethepreviewscreenfortheuserasshownbelow:

Wellthinkingitwouldbesimpletosolve,IcreatedanimagethetemplateIwanted,Iimporteditintothedrawablefolder,andIchangedXMLasfollows,imgaemPNGasbackgroundoftheFrameLayoutcomponent:

<FrameLayoutandroid:id="@+id/frameLayoutCamera"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/display_background"/>

But as a result the app made an error and stopped working "nor did it actually run".

After that, I tried to include an ImageView component overlapping the Camera's FrameLayout component, but it also gave an error:

<ImageView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/display_background"/>


<FrameLayout
    android:id="@+id/frameLayoutCamera"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

Note: I can put any component overlapping the FrameLayout, Buttons, TextViews, ImageView and others, the application runs normally, but if any component I put an image as background it gives error .. .

Thank you very much if someone can help me, because I am researching the days to see if I find something on the INTERNET to help me, but without success! Until then, I thought it was a simple thing to do, but now it has become difficult.

But I believe that somehow it is possible to do this, display the camera of the phone and put it as if it were a frame in the camera's Preview.

From now on thank you for helping me, hugs!