getSupportActionBar)。setTitle(“头衔”);

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); } }

getSupportActionBar)。setTitle(“头衔”);

如果你在活动中，最简单的方法是调用this.setTitle("…")。 如果你在一个片段中，只需调用getActivity().setTitle("…");

这样可以让你随时更改标题，不需要在setContentView(r.b ayout.activity_test)之前调用它;

在onCreateView中添加这个:

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

更改操作栏名称最简单的方法是转到AndroidManifest.xml并键入以下代码。

<activity android:name=".MainActivity"
    android:label="Your Label> </activity>