Set onclicklistener to a button inside the dialog box "Dialog"

Question

I have this piece of code for a dialog snippet

public class DialogOne extends DialogFragment { private Button b; public DialogOne() {} @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.dialog_one, container); getDialog().setTitle("Titolo del dialog"); b = (Button)getDialog().findViewById(R.button.ok); b.setOnclickListener(new OnClickListener() { @Override public void onClick(View v) { getDialog().dismiss(); } }); return view; } 

so when i click the button the dialog should be closed. When I launch the application, I have a NullPoinerException in the line containing the new OnClickListener. How can i fix this?

 > 02-28 21:05:44.623: E/AndroidRuntime(8487): FATAL EXCEPTION: main 02-28 21:05:44.623: E/AndroidRuntime(8487): java.lang.NullPointerException 02-28 21:05:44.623: E/AndroidRuntime(8487): at com.example.dialogs.DialogOne.onActivityCreated(DialogOne.java:37) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:1468) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:931) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.os.Handler.handleCallback(Handler.java:725) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.os.Handler.dispatchMessage(Handler.java:92) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.os.Looper.loop(Looper.java:137) 02-28 21:05:44.623: E/AndroidRuntime(8487): at android.app.ActivityThread.main(ActivityThread.java:5041) 02-28 21:05:44.623: E/AndroidRuntime(8487): at java.lang.reflect.Method.invokeNative(Native Method) 02-28 21:05:44.623: E/AndroidRuntime(8487): at java.lang.reflect.Method.invoke(Method.java:511) 02-28 21:05:44.623: E/AndroidRuntime(8487): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 02-28 21:05:44.623: E/AndroidRuntime(8487): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 02-28 21:05:44.623: E/AndroidRuntime(8487): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

I think you want to replace

b = (Button)getDialog().findViewById(R.button.ok);

with

b = (Button) view.findViewById(R.button.ok);