Hi @all, I wanted to create an activity where the top of the activity is dynamic and depends on a state change of the application (pressing a button).
Here is my xml file: <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"; android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:weightSum="2"> <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1"> <include android:id="@+id/included_main_screen" layout="@layout/ main_screen" /> <include android:id="@+id/included_onbuttonclick_screen" layout="@layout/onbuttonclick_screen" /> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" > <Button ... /> </LinearLayout> </LinearLayout> Both includes are RelativeLayout with id="main_screen" or id="onbuttonclick_screen". The idea was to play with VISIBLE and INVISIBLE attributes. But to my surprise the result is a NullPointerException. When I try to load the RelativeLayout (here in the example is a View) in the onCreate method of the activity View mMainScreen = this.findViewById(R.id.main_screen); View mOnButtonClickScreen= this.findViewById(R.id.onbuttonclick_screen); it is always null. The application crashes with a null pointer exception if I press the button and try to get the second xml file into the foreground. mMainScreen.setVisibility(View.INVISIBLE); mOnButtonClickScreen.setVisibility(View.VISIBLE); Does anybody see the reason why this can not work? I played around but was not able to get rid of that findViewById returns always a null pointer. The main_screen is shown correctly. First pressing the button leads to the crash - unfortunately! Does anybody have another idea, which is easy to handle? Thank you in advance. T-Droid -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
