Android Exception: View not attached to window manager

 

最近公司項目上線之前用Monkey測試，一直出這個錯誤：Exception: View not attached to window manager。特別糾結，後來總結了下，就是在Activity消失的情況下，還調用dialog的dismiss方法就出這個錯誤了。我的解決辦法是：
判斷當前的activity.isFinishing() + !=null + isShowing()，這三種方式去防止發生這個問題。

Exception: View not attached to window manager/ProcessDialog調用是旋轉螢幕拋出異常01-28 14:09:07.889: ERROR/AndroidRuntime(5084): java.lang.IllegalArgumentException: View not attached to window manager
01-28 14:09:07.889: ERROR/AndroidRuntime(5084):     at android.view.WindowManagerImpl.findViewLocked(WindowManagerImpl.java:355)
01-28 14:09:07.889: ERROR/AndroidRuntime(5084):     at android.view.WindowManagerImpl.removeView(WindowManagerImpl.java:200)
01-28 14:09:07.889: ERROR/AndroidRuntime(5084):     at android.view.Window$LocalWindowManager.removeView(Window.java:432)
01-28 14:09:07.889: ERROR/AndroidRuntime(5084):     at android.app.Dialog.dismissDialog(Dialog.java:278)
在Dialog轉圈圈的過程中，如果手機螢幕方向改變，那麼可能會拋出這個異常，原因就是螢幕翻轉後那些view重新畫出來，dialog在執行dismiss()的時候，
找不到原來的位置了。那麼要處理這個問題，最簡單的幾種方法是：

1. 限制螢幕翻轉
可在AndroidManifest.xml中設定android:screenOrientation=”portrait”

2. 如果是需要翻轉的，那麼限制那些view做重畫動作。
可在AndroidManifest.xml中設定android:configChanges=”orientation|keyboardHidden|navigation”

3.  如果你又要翻轉，又要重畫view，那你就用代碼去控制
private void lockScreen(){       

            Configuration newConfig = getResources().getConfiguration();      

           if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE){         //橫屏           

                        U.dout("ORIENTATION_LANDSCAPE lock it!");           

                        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);       

             }else if(newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){         //豎屏           

                       U.dout("SCREEN_ORIENTATION_PORTRAIT lock it!");           

                       setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);      

              } else if(newConfig.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_NO){         //鍵盤沒關閉。螢幕方向為橫屏                   

                       setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);       

              }else if(newConfig.hardKeyboardHidden == Configuration.KEYBOARDHIDDEN_YES){         //鍵盤關閉。螢幕方向為豎屏                   

                       setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);      

               }   

    }     

                private void unlockScreen(){       

                         U.dout("unlock!");       

                         setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);   

         }

參考：
http://www.2cto.com/kf/201202/119310.html