build.gradle (app):

//Android Studio 4.0 或更高版本
android {
    ...
    buildFeatures {
        viewBinding true
    }
}

activity_main:

<LinearLayout
       android:orientation="vertical"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
       
       <TextView android:id="@+id/tv_text"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"/>
</LinearLayout>

進行build 或 rebuild後，每個 Layout 就會對應生成一個綁定類別。如：MainActivity 的 Layout 為 activity_main，就會產生一個「ActivityMainBinding.java」

MainActivity:

public class MainActivity extends AppCompatActivity {
    private ResultProfileBinding binding;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       
       binding = ResultProfileBinding.inflate(getLayoutInflater());
       View view = binding.getRoot();
       setContentView(view);
       
       binding.tvText.setText("hello world");
    }
}

謝謝大家願意花時間閱讀，小弟弟我在此鞠躬