全屏顯示的包含webview的頁面中彈出的軟鍵盤覆蓋輸入框的問題

備註 1.使用adjustResize屬性時，若是界面中沒有滾動條，須要添加一個滾動條scrollview包裹全部內容，保證resize後 能滾動顯示顯示不下的內容 2.全屏fullscreen模式時 adjustResize屬性失效，屬因而一個bug，只能使用adjustPan 來設置焦點 3.全屏fullscreen模式時 webview adjustPan 偶爾也會失效

首先，在全屏的狀態下，android:windowSoftInputMode="adjustResize"屬性是不起做用的，官方文檔中有記錄： Window flag: hide all screen decorations (such as the status bar) while this window is displayed. This allows the window to use the entire display space for itself -- the status bar will be hidden when an app window with this flag set is on the top layer. A fullscreen window will ignore a value of SOFT_INPUT_ADJUST_RESIZE for the window's softInputMode field; the window will stay fullscreen and will not resize. 大意就是說在全屏狀態下，會忽略SOFT_INPUT_ADJUST_RESIZE屬性。而全屏狀態下設置爲android:windowSoftInputMode="adjustPan"也不必定會起做用。

http://stackoverflow.com/questions/7417123/android-how-to-adjust-layout-in-full-screen-mode-when-softkeyboard-is-visible/19494006#19494006在此找到了解決方法。

<!-- lang: java -->
      public class AndroidBug5497Workaround {
    
        // For more information, see https://code.google.com/p/android/issues/detail?id=5497
        // To use this class, simply invoke assistActivity() on an Activity that already has its content view set.
    
        public static void assistActivity (Activity activity) {
            new AndroidBug5497Workaround(activity);
        }
    
        private View mChildOfContent;
        private int usableHeightPrevious;
        private FrameLayout.LayoutParams frameLayoutParams;
    
        private AndroidBug5497Workaround(Activity activity) {
            FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
            mChildOfContent = content.getChildAt(0);
            mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
                public void onGlobalLayout() {
                    possiblyResizeChildOfContent();
                }
            });
            frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
        }
    
        private void possiblyResizeChildOfContent() {
            int usableHeightNow = computeUsableHeight();
            if (usableHeightNow != usableHeightPrevious) {
                int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
                int heightDifference = usableHeightSansKeyboard - usableHeightNow;
                if (heightDifference > (usableHeightSansKeyboard/4)) {
                    // keyboard probably just became visible
                    frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
                } else {
                    // keyboard probably just became hidden
                    frameLayoutParams.height = usableHeightSansKeyboard;
                }
                mChildOfContent.requestLayout();
                usableHeightPrevious = usableHeightNow;
            }
        }
    
        private int computeUsableHeight() {
            Rect r = new Rect();
            mChildOfContent.getWindowVisibleDisplayFrame(r);
            return (r.bottom - r.top);
        }
    
    }

只要在setContentvView以後調用assistActivity 方法便可。 在具體使用時發現有時鍵盤彈出後點擊空白處隱藏鍵盤，佈局並無恢復全屏，發現是有時候OnGlobalLayoutListener監聽並無被觸發，後替換成OnPreDrawListener監聽便可。 經多個模擬器與真機測試，發現OnGlobalLayoutListener能夠正常使用，應該是個別系統問題