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    lt com alpenglow androcap GhostSurfaceCameraView android id    id ghostview cameraview    android layout width  fill parent    android layout height  fill parent   gt    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

User · Answer

The thing to understand here is that    The constructor ViewClassName Context context  AttributeSet attrs   is called when inflating the customView via xml   You see you are not using the new keyword to instantiate your object i e  you are not doing new GhostSurfaceCameraView    Doing this you are calling the first constructor i e  public View  Context context     Whereas when inflating view from XML  i e  when using setContentView R layout ghostviewscreen   or using findViewById  you  NO  not you   the android system calls the ViewClassName Context context  AttributeSet attrs   constructor    This is clear when reading the documentation    Constructor that is called when inflating a view from XML   See  https   developer android com reference android view View html View android content Context  20android util AttributeSet   Hence  never forget basic polymorphism and never forget reading through the documentation  It saves a ton of headache

User · Answer

fwiw  I received this error due to some custom initialization within the constructor attempting to access a null object

User · Answer

I had the same problem extending a TextEdit  For me the mistake was I did non add  public  to the constructor  In my case it works even if I define only one constructor  the one with arguments Context and AttributeSet  The wired thing is that the bug reveals itself only when I build an APK  singed or not  and I transfer it to the devices  When the application is run via AndroidStudio -  RunApp on a USB connected device the app works

User · Answer

Tim - Both the constructors are not required  only the ViewClassName Context context  AttributeSet attrs   constructor is necessary  I found this out the painful way  after hours and hours of wasted time    I am very new to Android development  but I am making a wild guess here  that it maybe due to the fact that since we are adding the custom View class in the XML file  we are setting several attributes to it in the XML  which needs to be processed at the time of instantiation  Someone far more knowledgeable than me will be able to shed clearer light on this matter though

User · Answer

Another possible cause of the  Error inflating class  message could be misspelling the full package name where it s specified in XML    lt com alpenglow androcap GhostSurfaceCameraView android id    id ghostview cameraview      android layout width  fill parent      android layout height  fill parent   gt    Opening your layout XML file in the Eclipse XML editor should highlight this problem

User · Answer

in my case I added such cyclic resource    lt drawable name  above shadow  gt  drawable above shadow lt  drawable gt    then changed to    lt drawable name  some name  gt  drawable other name lt  drawable gt    and it worked

User · Answer

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

User · Answer

In my case  I copied my class from somewhere else and didn t notice right away that it was an abstract class  You can t inflate abstract classes

User · Answer

It s important to write full class path in the xml  I got  Error inflating class  when only subclass s name was written in

User · Answer

I had this error plaguing me for the past few hours  Turns out  I had added the custom view lib as a module in Android Studio  but I had neglected to add it as a dependency in app s build gradle   dependencies               compile project   gifview

[java] Error inflating when extending a class

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