如何在運行時在EditText中更改文本android

Question

我想在運行時更改編輯文本的文本，就像我在edittext中鍵入字符一樣，如果edittext lenth大於3，那麼它應該保持括號。

如果有人這樣做請讓我知道。

在此先感謝

Trapti

Answer 1

您可以註冊，只要字符輸入或從EditText上字段中刪除那個叫的EditText一個TextWatcher：

EditText editText = (EditText) findViewById(R.id.edit_text_field_id); 
editText.addTextChangedListener(new TextWatcher() { 

     @Override 
     public void beforeTextChanged(CharSequence s, int start, int count, int after) { 
      // This method is called to notify you that, within s, the count characters 
      // beginning at start are about to be replaced by new text with length after. 
     } 

     @Override 
     public void onTextChanged(CharSequence s, int start, int before, int count) { 
      // This method is called to notify you that, within s, the count characters 
      // beginning at start have just replaced old text that had length before. 
     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      // This method is called to notify you that, somewhere within s, the text has 
      // been changed. 
     } 
     }); 

見TextWatcher文檔瞭解更多詳情。