final View activityRootView = findViewById(R.id.activityRoot); 
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
  @Override 
  public void onGlobalLayout() { 
    int heightDiff = activityRootView.getRootView().getHeight() - activityRootView.getHeight(); 
    if (heightDiff > 100) { // 如果高度差超过100像素，就很有可能是有软键盘... 
      ... do something here 
    } 
   } 
}); 

InputMethodManager imm = (InputMethodManager) getSystemService(Activity.INPUT_METHOD_SERVICE);  
if(imm.hideSoftInputFromWindow(editText.getWindowToken(), 0)) 
{ 
   imm.showSoftInput(editText,0); 
//软键盘已弹出 
} 
else 
{ 
  //软键盘未弹出 
}