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java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.Context android.view.ViewGroup.getContext()' on a null object reference	at android.support.design.widget.Snackbar.(Snackbar.java:180)	at android.support.design.widget.Snackbar.make(Snackbar.java:209)	at nidhinkumar.gridcam.camerasample.adapter.GridViewImageAdapter$OnImageClickListener.onClick(GridViewImageAdapter.java:95)	at android.view.View.performClick(View.java:4848)	at android.view.View$PerformClick.run(View.java:20260)	at android.os.Handler.handleCallback(Handler.java:815)	at android.os.Handler.dispatchMessage(Handler.java:104)	at android.os.Looper.loop(Looper.java:194)	at android.app.ActivityThread.main(ActivityThread.java:5624)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)