测试应用时，Android应用标题栏没有显示？

Question

I'm creating an app, and when I build it and start it on my phone (a Sony Xperia Z1 with Android 4.4.4), the title bar doesn't show. All activities is rendered without the title bar, like this:

I'm using Android Studio, and in the editor, the title bar is visible. It just don't work when the app is being ran.

All help with this is appreciated!

Answer 1

Update to this answer. ActionBarActivity was deprecated as of version 22.1.0. To achieve this same outcome, extend AppCompatActivity.

ActionBarActivity API Class Reference

Answer 2

I just found the answer. Each of my Activity classes extended Activity , and when changing that to ActionBarActivity , the action bar (called "title bar" by me) shows up. I changed those values when I created the classes, because I "was sure" that in all my other projects, the classes extended just Activity , and not ActionBarActivity , but I "was sure wrong".

Thanks everyone for your suggestions!

Answer 3

我不在我的电脑上，因此我无法链接它，但请转到您的styles.xml并确保没有任何内容表示NoActionBar。