Android EditText - 如何檢測SoftKey是否寫入內容？

Question

我想檢測是否有放入EditText的東西放在那裏使用SoftKey。

我重寫dispatchKeyEvent但它不工作...

@Override 
    public boolean dispatchKeyEvent(KeyEvent event) { 
     Log.e("key pressed", String.valueOf(event.getKeyCode())); 
     return super.dispatchKeyEvent(event); 
    } 

Answer 1

查找解決

@Override 
    public boolean onKeyDown(int keyCode, KeyEvent event) { 
     if (keyCode == KeyEvent.KEYCODE_DEL) { 
      // like this you can detect 

     } 
     return super.onKeyDown(keyCode, event); 
    } 

Answer 2

yourEditText.addTextChangedListener(watcher); 

private TextWatcher watcher = new TextWatcher() { 
    @Override 
    public void onTextChanged(CharSequence s, int start, int before, 
int count) { 
     if(!s.toString().isEmpty()){ 
     //your text is not empty 
    } 

    @Override 
    public void beforeTextChanged(CharSequence s, int start, int count, 
int after) { 

    } 

    @Override 
    public void afterTextChanged(Editable s) { 

    } 
};