editText限制字数

 private EditText editText;//内容
 int num = 140;//限制的最大字数　
editText.addTextChangedListener(new TextWatcher() { //现在输入文字数
   private CharSequence temp;
   private int selectionStart;
   private int selectionEnd; 
   public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }  public void onTextChanged(CharSequence s, int start, int before, int count) { 
     temp = s;
     }
    public void afterTextChanged(Editable s) {
     int number = num - s.length();  
     String dd=number+"";
     
     selectionStart = editText.getSelectionStart();  
     selectionEnd = editText.getSelectionEnd();  
     if (temp.length() > num) { 
      s.delete(selectionStart - 1, selectionEnd); 
      int tempSelection = selectionEnd;  
      editText.setText(s);  
      editText.setSelection(tempSelection);//设置光标在最后
      } 
     }
    }
  );