edittext addtextchange listener重新提供文字

Question

我见过这么多的例子，但没有人为我工作。我想要的是通过EditText的addTextChangeListener（）设置文本到TextView。但我的textview文本正在为我在edittext中输入的每个字符重复。

我在这里我的代码：

edtFromName.addTextChangedListener(new TextWatcher() { 
      private String lastValue = ""; 
      @Override 
      public void beforeTextChanged(CharSequence s, int start, int count, int after) {} 
      @Override 
      public void onTextChanged(CharSequence s, int start, int before, int count) {} 
      @Override 
      public void afterTextChanged(Editable s) { 
       setMessage(); 
      } 
     }); 

// setMessage code: 
    private void setMessage() { 

     if (refVia.getSelectedItemPosition() < 3) { 
      if (txtCompany.equals("")) { 
       txtText.append(" or "); 
      } else { 
       txtText.append(" " + txtCompany + " or "); 
      } 
     } else { 
      if (txtSupplier.equals("")) { 
       txtText.append(" or "); 
      } else { 
       txtText.append(" " + txtSupplier + " or "); 
      } 
     } 

     txtText.append(edtFromName.getText().toString() + "."); 
    } 

输出：

Edittext: sagar 

textview: s 
textview: sa 
textview: sag 
textview: saga 
textview: sagar 

Answer 1

好了，所以对于附加。

int mainStringLength = txtText.getText().toString().length(); 
int nameStringLength = edtFromName.getText().toString().length(); 
String trimString = txtText.getText().toString().substring(0,(mainStringLength - nameStringLength); 

//Now set this string. 
txtText.setText(trimString);