java.lang.illegalstateexception could not find a method (view) in the activity class android fragment

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You can’t register the onClick callback(using android:onClick) for the Button(from the layout of the Dialog) in the Fragment class because Android will not find it as it will search only the Activity for a method matching that name(Btn_pumpInfo_Clicked) and it will throw that exception. Instead look for the Button in the Dialog and assign it a normal listener:

//...
dialog.setContentView(R.layout.pump_menu)
Button b = (Button) dialog.findViewById(R.id.Button_pumpInfo);
b.setOnClickListener(new OnClickListener() {

   @Override
   public void onCLick(View v) {
       // profit
   }
});

Or move the method :

public void Btn_pumpInfo_Clicked(View v) {
    // TODO Auto-generated method stub
    Toast.makeText(getActivity(), "You clicked on Item 1",
            Toast.LENGTH_LONG).show();
}

in the Activity class if it fits you.

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