我需要将数据从activity输出到片段

Bundle bundle = new Bundle();
bundle.putString("key", "value");

Fragment fragment = new YourFragment();
fragment.setArguments(bundle);

Bundle bundle = getArguments();
String value = bundle.getString("key");

public interface DataListener {
    void onDataReceived(String data);
}

public class YourActivity extends AppCompatActivity implements DataListener {
    @Override
    public void onDataReceived(String data) {
        // 处理接收到的数据
    }
}

DataListener listener = (DataListener) getActivity();
listener.onDataReceived("data");

public class YourActivity extends AppCompatActivity {
    private SharedViewModel viewModel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        viewModel = ViewModelProviders.of(this).get(SharedViewModel.class);
        viewModel.setData("data");
    }
}

public class YourFragment extends Fragment {
    private SharedViewModel viewModel;

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

        viewModel = ViewModelProviders.of(getActivity()).get(SharedViewModel.class);
        String data = viewModel.getData();
    }
}