Android報錯：WindowManager$BadTokenException: Unable to add window -- window has already been added

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很久之前測試通過的代碼，現在手機升級了Android7.0後一運行就崩潰，報出這樣的錯誤，具體錯誤如下：

Process: com.example.sho.android_anti_theft, PID: 26807            
android.view.WindowManager$BadTokenException: Unable to add window -- window [email protected] has already been added at android.view.ViewRootImpl.setView(ViewRootImpl.java:691) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:342) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94) at android.widget.Toast$TN.handleShow(Toast.java:434) at android.widget.Toast$TN$2.handleMessage(Toast.java:345) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

從報錯資訊中，我得出這樣一個結論：

在Android6.0以前，使用windowManager添加一個懸浮窗時，我使用的懸浮窗類型是TYPE_TOAST，即
params.type = WindowManager.LayoutParams.TYPE_TOAST;
windowManager.addView(contentView, params);
但是系統升級Android7.0後，就會報ndroid.view.WindowManager$BadTokenException: Unable to add window -- window [email protected] has already been added
的錯，具體意思是Toast已經被添加到視窗中，所以這時候我們可以把TYPE_TOAST換成TYPE_PHONE，這樣就可以顯示懸浮窗了，程式也不會crash。

這裡附上添加懸浮窗的代碼，僅供參考：

WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);WindowManager.LayoutParams params = new     WindowManager.LayoutParams();params.type = WindowManager.LayoutParams.TYPE_PHONE;params.format = PixelFormat.RGBA_8888;params.gravity = Gravity.LEFT | Gravity.TOP;params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;params.width = windowManager.getDefaultDisplay().getWidth();params.height = windowManager.getDefaultDisplay().getHeight();params.x = 0;params.y = 0;windowManager.addView(contentView, params);      //這裡要的contentview需要自己定義，而且添加懸浮窗需要動態申請懸浮窗許可權。

    

Android報錯：WindowManager$BadTokenException: Unable to add window -- window has already been added