将活动结果传递给正确的片段

public interface OnDataPass {
    void onDataPass(String data);
}

public class MainActivity extends AppCompatActivity implements OnDataPass {
    // ...

    @Override
    public void onDataPass(String data) {
        TargetFragment targetFragment = (TargetFragment) getSupportFragmentManager().findFragmentById(R.id.target_fragment);
        if (targetFragment != null) {
            targetFragment.updateData(data);
        }
    }
}

public class SourceFragment extends Fragment {
    private OnDataPass dataPasser;

    // ...

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        dataPasser = (OnDataPass) context;
    }

    private void sendDataToTargetFragment(String data) {
        dataPasser.onDataPass(data);
    }
}

public class TargetFragment extends Fragment {
    // ...

    public void updateData(String data) {
        // 处理传递过来的数据
    }
}