Hide title of an activity with Dialog theme

Question

I need to hide or change color my activity action bar. But when I try to do this I got an error FATAL EXCEPTION: main.

My activity theme is android:theme="@style/Theme.AppCompat.Light.Dialog

To hide

getSupportActionBar().hide();

To change background color

android.app.ActionBar bar = getActionBar();
bar.setBackgroundDrawable(new ColorDrawable(Color.RED));

I am stuck with this error.

Error log

10-03 18:09:38.088 14160-14160/com.example.myown.myapplication 
E/AndroidRuntime: FATAL EXCEPTION: main

Process: com.example.myown.myapplication, PID: 14160

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.myown.myapplication/com.example.myown.myapplication.MainActivity}: java.lang.NullPointerException
                                                                                  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2377)

how can we help with just error and setter code, kindly post getActionBar method completely, there will be some issue which is causing setter to scream. — mfaisalhyder, Oct 03 '17 at 12:10
Refer this :https://stackoverflow.com/questions/8024706/how-do-i-change-the-background-color-of-the-actionbar-of-an-actionbaractivity-us — Let's help, Oct 03 '17 at 12:13

Nabin Bhandari · Accepted Answer · 2017-10-03T12:56:34.267

5

Dialog theme do not have any ActionBar, use Theme.AppCompat.Light.

If you still want to use the Dialog theme and want to hide the title bar, call supportRequestWindowFeature(Window.FEATURE_NO_TITLE); immediately after super.onCreate.

edited Oct 03 '17 at 12:56

answered Oct 03 '17 at 12:10

Nabin Bhandari

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I need activity as half of the screen with transparency. so i use dialog theme. – JBR Oct 03 '17 at 12:15
in dialog theme there have an action bar – JBR Oct 03 '17 at 12:15
@JBR You will get null result if you call `getSupportActionBar()` in an activity with dialog theme. Which background are you trying to change? – Nabin Bhandari Oct 03 '17 at 12:31
then how we can hide it?? – JBR Oct 03 '17 at 12:42

Hide title of an activity with Dialog theme

1 Answers1