java - 在新 Activity 中找不到 id 的 View

Question

我创建了一个用于条形码扫描的 Activity 。 onCreate 看起来像这样:

public class GradeScreenScanner extends AppCompatActivity implements ZXingScannerView.ResultHandler {

    public static final int REQUEST_CAMERA = 1;

    protected ZXingScannerView scannerView;
    protected FirebaseFirestore db;
    protected String scanResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        scannerView = new ZXingScannerView(this);
        setContentView(scannerView);

        db = FirebaseFirestore.getInstance();
    }
}

一旦我得到结果，我就想启动一个新的 fragment ，如下所示:

android.app.FragmentManager fragmentManager = getFragmentManager();

ScreenFragment screenFragment = new ScreenFragment();

screenFragment.db = db;
screenFragment.serialNumberScanned = serialNumberScanned;

fragmentManager.beginTransaction()
        .addToBackStack("screen")
        .replace(R.id.content_frame, screenFragment)
        .commit();

但是我收到以下错误，我不知道如何处理:

java.lang.IllegalArgumentException: No view found for id 0x7f08005a (uk.wefix:id/content_frame) for fragment ScreenFragment{6262536 #1 id=0x7f08005a}

以防万一，创建时的 fragment 如下所示:

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
    myView = inflater.inflate(R.layout.grade_screens_layout, container, false);

    return myView;
}

感谢帮助。

@Override
public void setContentView(View view) {
    getDelegate().setContentView(view);
}

Answer 1

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/content_frame"/>

Activity View 中的 xml 缺失。我的错误，很明显 Umair