在Android中保存和還原片段狀態

Question

如何在Android中保存和還原Fragment狀態？ 我的代碼用於保存和恢復狀態：

  @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt("CurrentState",CurrentState);
    }


public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        if (savedInstanceState != null) {
            // Restore last state for checked position.
            CurrentState = savedInstanceState.getInt("CurrentState", 0);
        }
        .
         .
        .
        switch (CurrentState){
            case 1 :button_DisplayMemoris.performClick();break;
            case 2 :
                linearLayout_AddMemoris.setVisibility(View.VISIBLE);
                linearLayout_Memoris.setVisibility(View.GONE);
                linearLayout_DisplayMemoris.setVisibility(View.GONE);
                break;
            default:break;
        }
        return inflate;
    }

當CurrentState=2 ， linearLayout_AddMemoris不顯示

我如何解決它？

更新：

這是我的活動：

public class ToolsActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tools);
        displayView();
    }
    public void displayView() {
        // update the main content by replacing fragments
        Fragment fragment = = new MemoirsFragment();
            FragmentManager fm = getFragmentManager();
            FragmentTransaction ft = fm.beginTransaction();
            ft.replace(R.id.frame_container, fragment);
            ft.commit();
    }
}

有辦法解決問題嗎？ 我不知道

Answer 1

加入onCreate方法的空檢查，現在您將恢復的片段替換為新的片段

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tools);
    if (savedInstanceState == null)
        displayView();
}