保存數據片段的方向變化

什麼，我試圖做 ::我想保存數據進入的EditText和微調onorientation改變保存數據片段的方向變化

發生了什麼 :::我不能保存數據，我怎麼能解決這個

MainActivity.java

public class MainActivity extends FragmentActivity { 

    Fragment_A frgObj; 

    @Override 
    protected void onCreate(Bundle arg0) { 
     super.onCreate(arg0); 
     Log.d("MAIN-ACTIVITY", "onCreate"); 
     setContentView(R.layout.activity_main); 
    } 

    @Override 
    protected void onStart() { 
     super.onStart(); 
     Log.d("MAIN-ACTIVITY", "onStart"); 
     frgObj=Fragment_A.newInstance(); 

     getSupportFragmentManager().beginTransaction().replace(R.id.container, frgObj).addToBackStack(null).commit(); 
    } 

    public void onSaveInstanceState(Bundle outState){ 
      getSupportFragmentManager().putFragment(outState,"myfragment",frgObj); 
     } 
     public void onRetoreInstanceState(Bundle inState){ 
      frgObj = (Fragment_A) getSupportFragmentManager().getFragment(inState,"myfragment"); 
     } 
}

Fragment_A.java

public class Fragment_A extends Fragment{ 

    Button btn; 
    Spinner spinner; 
    EditText editText; 
    SeekBar seekBar; 

    public static Fragment_A newInstance() { 
     Log.d("FRAGMENT-A", "newInstance"); 

     Fragment_A fragment = new Fragment_A(); 
     return fragment; 
    } 

    @Override 
    public void onAttach(Activity activity) { 
     Log.d("FRAGMENT-A", "onAttach"); 
     super.onAttach(activity); 
    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     Log.d("FRAGMENT-A", "onCreate"); 
     super.onCreate(savedInstanceState); 


    } 

    @Override 
    public void onSaveInstanceState(Bundle outState) { 
     Log.d("FRAGMENT-A", "onSaveInstanceState"); 

     super.onSaveInstanceState(outState); 
     //City Spinner state 
     outState.putString("editText", editText.getText().toString()); 
     outState.putInt("yourSpinner", spinner.getSelectedItemPosition()); 

    } 



    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
      Bundle savedInstanceState) { 
     Log.d("FRAGMENT-A", "onCreateView"); 
     View view=inflater.inflate(R.layout.fragment_a, container, false); 

     btn=(Button) view.findViewById(R.id.buttonId1); 
     spinner=(Spinner) view.findViewById(R.id.spinnerId1); 
     editText=(EditText) view.findViewById(R.id.editTextId1); 
     seekBar=(SeekBar) view.findViewById(R.id.seekBarId1); 

     return view; 
    } 


    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     Log.d("FRAGMENT-A", "onActivityCreated"); 
     super.onActivityCreated(savedInstanceState); 

     if (savedInstanceState != null) { 
       //City Spinner state 
      editText.setText(savedInstanceState.getString("editText")); 
      spinner.setSelection(savedInstanceState.getInt("yourSpinner", 0)); 

      }  
    } 

    @Override 
    public void onStart() { 
     Log.d("FRAGMENT-A", "onStart"); 
     super.onStart(); 

     btn.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       Log.d("FRAGMENT-A", "button Clicked"); 

       Fragment_B frgObj=Fragment_B.newInstance(); 

       getActivity().getSupportFragmentManager().beginTransaction().replace(R.id.container, frgObj,"Fragment_B").addToBackStack(null).commit(); 

      } 
     }); 
    } 

}

來源

2014-07-22 Devrath

在你的MainActivity中刪除onSaveInstanceState和onRetoreInstanceState –

@Rod_Algonquin ....我認爲這是必要的權利.....（我引用此棧發佈http://stackoverflow.com/a/15914053/1083093） – Devrath

我不認爲你需要改變你的任何活動除了打電話super.onSaveInstanceState(Bundle)。將數據onSaveInstanceState保存在片段中應該足夠了。我會把恢復邏輯放在onCreateView而不是onActivityCreated。 onCreateView保證在重新創建片段時調用，但onActivityCreated不是這種情況。

另一件你可以嘗試的事情就是不去做任何這些事情，並且使用setRetainInstance(true)，它應該通過方向改變來保留你的實例變量。

來源

2014-07-22 06:59:31 Ali

保存數據片段的方向變化

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