活動重新創建和閃爍

Question

我有FirstRunActivity和MainActivity（啓動器）。當應用程序打開，如果應用程序第一次打開，我開始FirstRunActivity（與清除活動的歷史）。

它工作正常。但是，在設備中啓用自動旋轉功能後，使用旋轉的設備打開應用程序時，屏幕會閃爍。在日誌中，我可以看到該活動在循環中重新創建。

日誌：

3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:00.390 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:00.410 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:00.410 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:00.480 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:00.480 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:00.520 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:00.520 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:00.630 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:00.630 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:00.680 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:00.680 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:00.800 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:00.810 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:00.870 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:00.870 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:00.960 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:00.970 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:00.990 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:00.990 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:01.060 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:01.060 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:01.080 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:01.080 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:01.150 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:01.150 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:01.180 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:01.180 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:01.250 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 
04-17 22:49:01.250 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStop 
04-17 22:49:01.280 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onStart 
04-17 22:49:01.280 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onResume 
04-17 22:49:01.430 3028-3028/tm.mobile.payment D/SazHyzmat﹕ FirstRunActivity onPause 

FirstRunActivity.java：

public class FirstRunActivity extends ActionBarActivity { 

    @InjectView(R.id.password) EditText passwordView; 
    @InjectView(R.id.password_retype) EditText passwordRetypeView; 
    @InjectView(R.id.save) View saveButton; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_first_run); 
     ButterKnife.inject(this); 
    } 

    @Override protected void onStart() { 
     super.onStart(); 
     U.l("FirstRunActivity onStart"); 
    } 

    @Override protected void onStop() { 
     super.onStart(); 
     U.l("FirstRunActivity onStop"); 
    } 

    @Override protected void onPause() { 
     super.onStart(); 
     U.l("FirstRunActivity onPause"); 
    } 

    @Override protected void onResume() { 
     super.onStart(); 
     U.l("FirstRunActivity onResume"); 
    } 
} 

MainActivity.java：

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     settingsManager = SettingsManager.getInstance(this); 
     //If app not initialized 
     if (! settingsManager.isAppInitialized()) { 
      Intent intent = new Intent(this, FirstRunActivity.class); 
      intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); 
      ComponentName cn = intent.getComponent(); 
      Intent mainIntent = IntentCompat.makeRestartActivityTask(cn); 
      startActivity(mainIntent); 
       finish(); 
     } else { 
      //Other code 
     } 
} 

如果我改變代碼，開始第一次運行活性（MainActivity.java）在剛開始活動時，活動不會閃爍，但按下後按鈕將打開MainAct與白色屏幕的真實感。 或以其他方式清除活動歷史記錄，例如：Clear the entire history stack and start a new activity on Android無論如何屏幕​​閃爍。

那麼，我該如何停止閃爍和清除活動歷史？

編輯

測試後我發現，在我的其他活動，這與上面的代碼沒有關係，有同樣的問題，閃爍。使用旋轉的設備打開活動時。

Answer 1

查看IntentCompat.makeRestartActivityTask的文檔，它聽起來像它創建一個意圖，用於重新啓動您當前的活動。我建議刪除這兩行：

ComponentName cn = intent.getComponent(); 
Intent mainIntent = IntentCompat.makeRestartActivityTask(cn); 

我從來不需要他們，而改變活動。

此外，對於mContext.finish（）的調用可以用finish（）完成，在這種情況下永遠不能爲null，很可能是因爲你看到白色屏幕的原因是mContext爲null，所以你從未成功完成該活動。

Answer 2

您需要使用NoDisplay主題在清單中定義活動。然後，啓動FirstRunActivity或LoginActivity（或其他）。不需要IntentCompat除非你支持蜂窩下面，在這裏你可以使用版本FLAG_ACTIVITY_CLEAR_TASK

見https://stackoverflow.com/a/4892712/218473