Error inflating when extending a class

Question

I'm trying to create a custom view GhostSurfaceCameraView that extends SurfaceView. Here's my class definition file

GhostSurfaceCameraView.java:

public class GhostSurfaceCameraView extends SurfaceView implements SurfaceHolder.Callback {

    SurfaceHolder mHolder;

    Camera mCamera;

    GhostSurfaceCameraView(Context context) {

        super(context);

        // Install a SurfaceHolder.Callback so we get notified when the

        // underlying surface is created and destroyed.

        mHolder = getHolder();

        mHolder.addCallback(this);

        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    }

    public void surfaceCreated(SurfaceHolder holder) {

        // The Surface has been created, acquire the camera and tell it where to draw.

        mCamera = Camera.open();

        try {

            mCamera.setPreviewDisplay(holder);

        } catch (IOException exception) {

            mCamera.release();

            mCamera = null;

            // TODO: add more exception handling logic here

        }

    }

    public void surfaceDestroyed(SurfaceHolder holder) {

        // Surface will be destroyed when we return, so stop the preview.

        // Because the CameraDevice object is not a shared resource, it's very

        // important to release it when the activity is paused.

        mCamera.stopPreview();

        mCamera.release();

        mCamera = null;

    }   

    public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {

        // Now that the size is known, set up the camera parameters and begin

        // the preview.

        Camera.Parameters parameters = mCamera.getParameters();

        parameters.setPreviewSize(w, h);

        parameters.set("orientation", "portrait");

        // parameters.setRotation(90); // API 5+

        mCamera.setParameters(parameters);

        mCamera.startPreview();

    }

}

And this is in my ghostviewscreen.xml:

<com.alpenglow.androcap.GhostSurfaceCameraView android:id="@+id/ghostview_cameraview"

  android:layout_width="fill_parent"

  android:layout_height="fill_parent"/>

Now in the activity I made:

protected void onCreate(Bundle savedInstanceState) {

    try {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.ghostviewscreen);

    }

}

When setContentView() gets called, an exception is thrown:

Binary XML file 09-17 22:47:01.958: ERROR/ERROR(337):

ERROR IN CODE:

android.view.InflateException: Binary

XML file line #14: Error inflating

class

com.alpenglow.androcap.GhostSurfaceCameraView

Can anyone tell me why I get this error? Thanks.

Answer 1

I think I figured out why this wasn't working. I was only providing a constructor for the case of one parameter 'context' when I should have provided a constructor for the two parameter 'Context, AttributeSet' case. I also needed to give the constructor(s) public access. Here's my fix:

public class GhostSurfaceCameraView extends SurfaceView implements SurfaceHolder.Callback {

        SurfaceHolder mHolder;

        Camera mCamera;

        public GhostSurfaceCameraView(Context context)

        {

            super(context);

            init();

        }

        public GhostSurfaceCameraView(Context context, AttributeSet attrs)

        {

            super(context, attrs);

            init();

        }

        public GhostSurfaceCameraView(Context context, AttributeSet attrs, int defStyle) {

            super(context, attrs, defStyle);

            init();

        }