Android解决全屏下WebView中输入框被键盘遮挡

1. /**  
2.  * 解决webView键盘遮挡问题的类  
3.  * Created by zqy on 2016/11/14.  
4.  */  
5. public class KeyBoardListener {  
6.     private Activity activity;  
7. // private Handler mhanHandler;  
8.   
9.   
10.     private View mChildOfContent;  
11.     private int usableHeightPrevious;  
12.     private FrameLayout.LayoutParams frameLayoutParams;  
13.   
14.     private static KeyBoardListener keyBoardListener;  
15.   
16.   
17.     public static KeyBoardListener getInstance(Activity activity) {  
18. // if(keyBoardListener==null){  
19.         keyBoardListener=new KeyBoardListener(activity);  
20. // }  
21.         return keyBoardListener;  
22.     }  
23.   
24.   
25.     public KeyBoardListener(Activity activity) {  
26.         super();  
27. // TODO Auto-generated constructor stub  
28.         this.activity = activity;  
29. // this.mhanHandler = handler;  
30.   
31.     }  
32.   
33.   
34.     public void init() {  
35.   
36.   
37.         FrameLayout content = (FrameLayout) activity  
38.                 .findViewById(android.R.id.content);  
39.         mChildOfContent = content.getChildAt(0);  
40.         mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(  
41.                 new ViewTreeObserver.OnGlobalLayoutListener() {  
42.                     public void onGlobalLayout() {  
43.                         possiblyResizeChildOfContent();  
44.                     }  
45.                 });  
46.         frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent  
47.                 .getLayoutParams();  
48.   
49.   
50.     }  
51.   
52.   
53.     private void possiblyResizeChildOfContent() {  
54.         int usableHeightNow = computeUsableHeight();  
55.         if (usableHeightNow != usableHeightPrevious) {  
56.             int usableHeightSansKeyboard = mChildOfContent.getRootView()  
57.                     .getHeight();  
58.             int heightDifference = usableHeightSansKeyboard - usableHeightNow;  
59.             if (heightDifference > (usableHeightSansKeyboard / 4)) {  
60. // keyboard probably just became visible  
61.                 frameLayoutParams.height = usableHeightSansKeyboard  
62.                         - heightDifference;  
63.             } else {  
64. // keyboard probably just became hidden  
65.                 frameLayoutParams.height = usableHeightSansKeyboard;  
66.             }  
67.             mChildOfContent.requestLayout();  
68.             usableHeightPrevious = usableHeightNow;  
69.         }  
70.     }  
71.   
72.   
73.     private int computeUsableHeight() {  
74.         Rect r = new Rect();  
75.         mChildOfContent.getWindowVisibleDisplayFrame(r);  
76.         return (r.bottom - r.top);  
77.     }  
78.  
79.   
80. } 
    
81. 调用方式为：KeyBoardListener.getInstance(this).init();，即可解决全屏下，键盘遮挡问题。