小编pea*_*nut的帖子

我创建了一个全新的项目来演示我的问题。基本上，我的片段有两个RadioButton. 当 onCreateView 时，我总是使用radioButtonFirst.setChecked(true);. 但是，如果我检查radioButtonSecond然后按“后退”按钮导航，下次打开它时，它会自动检查radioButtonSecond. 这种行为打破了我的逻辑。

MainActivity.java

public class MainActivity extends AppCompatActivity {
    private WeirdFragment weirdFragment;
    private FragmentManager fragmentManager;
    private FragmentTransaction fragmentTransaction;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        weirdFragment = new WeirdFragment();
        fragmentManager = getSupportFragmentManager();
    }
    public void openFragment(View v){
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.container, weirdFragment);
        fragmentTransaction.addToBackStack(null);
        fragmentTransaction.commit();
    }
}

奇怪的Fragment.java

public class WeirdFragment extends Fragment {
    private RadioButton radioButtonFirst;
    private RadioButton radioButtonSecond;
    private Button buttonReturn;
    @Nullable
    @Override
    public View onCreateView(@NonNull …