Android: Error inflating class

Question

Hello, I'm new to Android development and I've been having an issue that I haven't been able to fix. I'm mostly using code from examples provided in the SDK so I'm not sure what's happening here. I'm simply 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();
        }