Android监听软键盘弹出与隐藏的两种方法

@Override 
 public void onLayoutChange(View v, int left, int top, int right, 
     int bottom, int oldLeft, int oldTop, int oldRight, int oldBottom) { 

   //old是改变前的左上右下坐标点值，没有old的是改变后的左上右下坐标点值 

   //现在认为只要控件将Activity向上推的高度超过了1/3屏幕高，就认为软键盘弹起 
   if(oldBottom != 0 && bottom != 0 &&(oldBottom - bottom > keyHeight)){ 

     Toast.makeText(MainActivity.this, "监听到软键盘弹起...", Toast.LENGTH_SHORT).show(); 

   }else if(oldBottom != 0 && bottom != 0 &&(bottom - oldBottom > keyHeight)){ 

     Toast.makeText(MainActivity.this, "监听到软件盘关闭...", Toast.LENGTH_SHORT).show(); 

   } 

 }

//contentlayout是最外层布局
mChildOfContent = contentlayout.getChildAt(0);
mChildOfContent.getViewTreeObserver()
.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {  
   public void onGlobalLayout() {    
       possiblyResizeChildOfContent();  
}});

private void possiblyResizeChildOfContent() {  
int usableHeightNow = computeUsableHeight();  
if (usableHeightNow != usableHeightPrevious) {    
   int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();    
   int heightDifference = usableHeightSansKeyboard - usableHeightNow;    
   if (heightDifference > (usableHeightSansKeyboard / 4)) {      
   // 键盘弹出    
   } else {      
   // 键盘收起      
   productInfo.setVisibility(View.GONE);      
   productInfoEnd.setText(productInfo.getText().toString());    
}    
   mChildOfContent.requestLayout();    
    usableHeightPrevious = usableHeightNow;  
}
}

private int computeUsableHeight() {  
 Rect r = new Rect();  
mChildOfContent.getWindowVisibleDisplayFrame(r);  
return (r.bottom - r.top);}