科特林

您可以以这种方式在Kotlin中以编程方式完成它。如果"supportActionBar"为空，你就忽略它:

    supportActionBar?.setTitle(R.string.my_text)
    supportActionBar?.title = "My text"

或者这样。如果“supportActionBar”为空，则抛出异常。

    supportActionBar!!.setTitle(R.string.my_text)
    supportActionBar!!.title = "My text"

ActionBar ab = getActionBar();
TextView tv = new TextView(getApplicationContext());

LayoutParams lp = new RelativeLayout.LayoutParams(
        LayoutParams.MATCH_PARENT, // Width of TextView
        LayoutParams.WRAP_CONTENT);
tv.setLayoutParams(lp);
tv.setTextColor(Color.RED);
ab.setCustomView(tv);

欲了解更多信息，请查看此链接:

http://android--code.blogspot.in/2015/09/android-how-to-change-actionbar-title_21.html

我们可以用以下两种方式之一更改动作栏标题:

In the Manifest: in the manifest file, set the label of each Activity. android:label="@string/TitleWhichYouWantToDisplay" In code: in code, call the setTitle() method with a String or the id of String as the argument. public class MainActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { setTitle(R.string.TitleWhichYouWantToDisplay); // OR You can also use the line below // setTitle("MyTitle") setContentView(R.layout.activity_main); } }

只需在onCreate方法中添加此代码。

setTitle("new title");

试着这样做……

public void onCreate(Bundle savedInstanceState) 
{
super.onCreate(savedInstanceState);
    this.setTitle(String.format(your_format_string, your_personal_text_to_display));
    setContentView(R.layout.your_layout);
       ...
       ...
}

这对我很有用

在onCreateView中添加这个:

(activity as AppCompatActivity).supportActionBar?.title ="My APP Title"