OnCreate對話框和屏幕旋轉

Question

我在我的活動的onCreate（）中有一個alertDialog，它設置活動的某些屬性。

public class MyActivity extends AppCompatActivity { 

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

     AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this); 
     alertDialogBuilder.setTitle("My Dialog"); 
     alertDialogBuilder 
      .setCancelable(false) 
      ... 

     AlertDialog alertDialog = alertDialogBuilder.create(); 
     alertDialog.show(); 
    } 
} 

當我開始活動時，對話框會啓動，並在提交對話框後設置屬性並關閉對話框。到現在爲止還挺好。但是，如果此時（在提交/解除對話框之後），我旋轉設備/屏幕，再次調用onCreate（），並再次打開對話框（我不想）。

如何防止在屏幕旋轉中打開對話框？或者我應該在其他地方創建對話框（而不是在activity的onCreate（）中）？

Answer 1

您的問題被稱爲每次旋轉屏幕時間onCreateMethod可以覆蓋onSaveInstanceState方法來保存當前佈局的實例現在

boolean isSubmited=false; 
public void onSaveInstanceState(Bundle savedInstanceState) { 
// Save the user's current game state 
savedInstanceState.putBoolean(isSubmited, true); 


// Always call the superclass so it can save the view hierarchy state 
super.onSaveInstanceState(savedInstanceState); 
} 

當您提交的對話框中，更改isSubmited爲true然後鍵入

if(isSubmited) 
alertDialog.show(); 

參考http://developer.android.com/training/basics/activity-lifecycle/recreating.html

Answer 2

基於羅勒Battikhi的SOLUT離子我結束了以下工作：

@Override 
protected void onSaveInstanceState(Bundle savedInstanceState) { 
    // save whether dialog has been submitted 
    savedInstanceState.putBoolean("isSubmitted", isSubmitted); 

    super.onSaveInstanceState(savedInstanceState); 
} 

@Override 
protected void onPause() { 
    super.onPause(); 
    if (alertDialog != null) { 
     alertDialog.dismiss(); // prevent window leak when screen is rotated while dialog shown 
    } 
} 

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

    // check whether activity is recreated or created for the first time 
    if(savedInstanceState != null) { 
     // recover information on whether dialog was submitted 
     isSubmitted = savedInstanceState.getBoolean("isSubmitted"); 
    } 

    alertDialogBuilder.setPositiveButton("Start", new DialogInterface.OnClickListener() { 
       public void onClick(DialogInterface dialog, int id) { 
       ... 
       isSubmitted=true; 
       })} 

    if (!isSubmitted) { 
     alertDialog.show(); 
    }