在寫播放器的時候,遇到了關于全屏模式的坑。翻閱了網上一些資料和google 官方的demo后,終于把坑填完了。
全屏主要的干擾就是 頂部狀態欄stateBar和部分手機的虛擬按鍵NavigationBar。
這是google demo的源碼:
/** * Detects and toggles immersive mode (also known as "hidey bar" mode). */ public void toggleHideyBar() { // BEGIN_INCLUDE (get_current_ui_flags) // The UI options currently enabled are rePResented by a bitfield. // getSystemUiVisibility() gives us that bitfield. int uiOptions = getActivity().getWindow().getDecorView().getSystemUiVisibility(); int newUiOptions = uiOptions; // END_INCLUDE (get_current_ui_flags) // BEGIN_INCLUDE (toggle_ui_flags) boolean isImmersiveModeEnabled = ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions); if (isImmersiveModeEnabled) { Log.i(TAG, "Turning immersive mode mode off. "); } else { Log.i(TAG, "Turning immersive mode mode on."); } // Navigation bar hiding: Backwards compatible to ICS. if (Build.VERSION.SDK_INT >= 14) { newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION; } // Status bar hiding: Backwards compatible to Jellybean if (Build.VERSION.SDK_INT >= 16) { newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN; } // Immersive mode: Backward compatible to KitKat. // Note that this flag doesn't do anything by itself, it only augments the behavior // of HIDE_NAVIGATION and FLAG_FULLSCREEN. For the purposes of this sample // all three flags are being toggled together. // Note that there are two immersive mode UI flags, one of which is referred to as "sticky". // Sticky immersive mode differs in that it makes the navigation and status bars // semi-transparent, and the UI flag does not get cleared when the user interacts with // the screen. if (Build.VERSION.SDK_INT >= 18) { newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY; } getActivity().getWindow().getDecorView().setSystemUiVisibility(newUiOptions); //END_INCLUDE (set_ui_flags) }這個demo比較簡單,不做詳細的解釋。就簡單的介紹下Flag等意思。
getActivity().getWindow().getDecorView() //獲取當前頁面的跟布局。View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;//控制NavigationBar的隱藏于顯示。View.SYSTEM_UI_FLAG_FULLSCREEN;//控制stateBar的隱藏與顯示。View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;這個標簽比較有趣。其實這個標簽有兩個:View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY 和 View.SYSTEM_UI_FLAG_IMMERSIVE。這兩個標簽都必須和View.SYSTEM_UI_FLAG_HIDE_NAVIGATION、View.SYSTEM_UI_FLAG_FULLSCREEN 一起使用。下面分為3中情況:
1、只使用View.SYSTEM_UI_FLAG_HIDE_NAVIGATION 和 View.SYSTEM_UI_FLAG_FULLSCREEN 。
這種情況下,在進入全屏模式后,用戶有任何操作,SYSTEM_UI_FLAG_HIDE_NAVIGATION和SYSTEM_UI_FLAG_FULLSCREEN 就會被清除。狀態欄和虛擬按鍵會一直可見。除非再次設置SYSTEM_UI_FLAG_HIDE_NAVIGATION和SYSTEM_UI_FLAG_FULLSCREEN。在狀態欄和虛擬按鍵顯示變化時會調用View.OnSystemUiVisibilityChangeListener。
2、SYSTEM_UI_FLAG_IMMERSIVE 配合View.SYSTEM_UI_FLAG_HIDE_NAVIGATION 和 View.SYSTEM_UI_FLAG_FULLSCREEN使用。
用戶操作不會清除SYSTEM_UI_FLAG_HIDE_NAVIGATION和SYSTEM_UI_FLAG_FULLSCREEN。會一直保持全屏模式。顯示切換時也會觸發View.OnSystemUiVisibilityChangeListener。還有一個區別就是 ,全屏模式時,從原本狀態欄或者虛擬按鍵的位置 響屏幕內部滑動,會清除SYSTEM_UI_FLAG_HIDE_NAVIGATION和SYSTEM_UI_FLAG_FULLSCREEN,保持可見狀態,并且也會觸發View.OnSystemUiVisibilityChangeListener監聽。3.SYSTEM_UI_FLAG_IMMERSIVE_STICKY配合View.SYSTEM_UI_FLAG_HIDE_NAVIGATION 和 View.SYSTEM_UI_FLAG_FULLSCREEN使用。
用戶操作不會清除SYSTEM_UI_FLAG_HIDE_NAVIGATION和SYSTEM_UI_FLAG_FULLSCREEN。會一直保持全屏模式。顯示切換時也會觸發View.OnSystemUiVisibilityChangeListener。,全屏模式時,,從原本狀態欄或者虛擬按鍵的位置 響屏幕內部滑動, 狀態欄 和 虛擬按鍵欄會暫時可見,一段時間后自動隱藏。與SYSTEM_UI_FLAG_IMMERSIVE 不同的是,因為是臨時的顯示,所以不會觸發View.OnSystemUiVisibilityChangeListener??赡苷f的有點混亂,可以參考下下面的表格。
個人覺得使用toggleHideyBar()來控制有點不順手,所以拆分成了showBar()和hideBar()。
public void showBar(){ int uiOptions = getWindow().getDecorView().getSystemUiVisibility(); int newUiOptions = uiOptions; boolean isImmersiveModeEnabled = ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions); if (isImmersiveModeEnabled) { Log.i(TAG, "Turning immersive mode mode off. "); //先取 非 后再 與, 把對應位置的1 置成0,原本為0的還是0 if (Build.VERSION.SDK_INT >= 14) { newUiOptions &= ~View.SYSTEM_UI_FLAG_HIDE_NAVIGATION; } if (Build.VERSION.SDK_INT >= 16) { newUiOptions &= ~View.SYSTEM_UI_FLAG_FULLSCREEN; } if (Build.VERSION.SDK_INT >= 18) { newUiOptions &= ~View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY; } getWindow().getDecorView().setSystemUiVisibility(newUiOptions); } } public void hideBar() { // The UI options currently enabled are represented by a bitfield. // getSystemUiVisibility() gives us that bitfield. int uiOptions = getWindow().getDecorView().getSystemUiVisibility(); int newUiOptions = uiOptions; boolean isImmersiveModeEnabled = ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions); if (!isImmersiveModeEnabled) { Log.i(TAG, "Turning immersive mode mode on. "); if (Build.VERSION.SDK_INT >= 14) { newUiOptions |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION; } if (Build.VERSION.SDK_INT >= 16) { newUiOptions |= View.SYSTEM_UI_FLAG_FULLSCREEN; } if (Build.VERSION.SDK_INT >= 18) { newUiOptions |= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY; } getWindow().getDecorView().setSystemUiVisibility(newUiOptions); } }暫時就寫這么多吧。
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