如何驗證虛擬鍵盤可見性？

Question

我想在虛擬鍵盤打開時顯示按鈕，如果虛擬鍵盤可見性關閉，則隱藏此按鈕。但是我找不到任何偵聽器來執行此活動。 任何人都知道如何做到這一點？

Answer 1

如發現here，您需要實例化SoftkeyBoard並添加一個偵聽器。

/* 
Somewhere else in your code 
*/ 

RelativeLayout mainLayout = findViewById(R.layout.main_layout); // You must use your root layout 
InputMethodManager im = (InputMethodManager) getSystemService(Service.INPUT_METHOD_SERVICE);  

/* 
Instantiate and pass a callback 
*/ 

SoftKeyboard softKeyboard; 
softKeyboard = new SoftKeyboard(mainLayout, im); 
softKeyboard.setSoftKeyboardCallback(new SoftKeyboard.SoftKeyboardChanged() 
{ 
@Override 
    public void onSoftKeyboardHide() 
    { 
     // Code here 
    } 

    @Override 
    public void onSoftKeyboardShow() 
    { 
     // Code here 
    } 
});  

/* 
Open or close the soft keyboard programatically 
*/ 

softKeyboard.openSoftKeyboard(); 
softKeyboard.closeSoftKeyboard(); 


/* 
SoftKeyboard can catch keyboard events when an EditText gains focus and keyboard appears 
*/ 


/* Prevent memory leaks: 
*/ 

@Override 
public void onDestroy() 
{ 
    super.onDestroy(); 
    softKeyboard.unRegisterSoftKeyboardCallback(); 
} 

在他的文章中，您還可以找到更多關於錯誤修復和可能問題的信息。

Answer 2

添加onGlobalLayoutListener到活動/片段的父視圖，使您的按鈕知名度相應

final View parentView= findViewById(R.id.myrootview); 
     parentView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
     @Override 
     public void onGlobalLayout() { 
      int heightDiff = root.getRootView().getHeight() - root.getHeight(); 

      Rect rectgle= new Rect(); 
      Window window= getWindow(); 
      window.getDecorView().getWindowVisibleDisplayFrame(rectgle); 
      int contentViewTop= 
       window.findViewById(Window.ID_ANDROID_CONTENT).getTop(); 

      if(heightDiff <= contentViewTop){ 
       //Soft KeyBoard Hidden---button visible 

      }else{ 
       //Soft KeyBoard Shown---button hide 
      } 


     } 
    }); 

Answer 3

有鍵盤沒有直接的事件打開和關閉。但是您可以在完整版面上創建觀察者，然後顯示按鈕或任何您想要執行的操作。 對於觀察者代碼檢查 - Hide part of activity_main.xml if keyboard is open (Android)