android 限定 EditText字符输入个数

        messageContentEditText.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {            }            @Override            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {            }            @Override            public void afterTextChanged(Editable s) {                int nSelStart = 0;                int nSelEnd = 0;                boolean nOverMaxLength = false;                nSelStart = messageContentEditText.getSelectionStart();                nSelEnd = messageContentEditText.getSelectionEnd();                nOverMaxLength = (s.length() > MAX_MESSAGE_CHAR_LENGTH) ? true : false;                if (nOverMaxLength) {                    Toast.makeText(MessageSendActivity.this,                            "不能超过" + MAX_MESSAGE_CHAR_LENGTH + "字符！",                            Toast.LENGTH_SHORT);                    s.delete(nSelStart - 1, nSelEnd);                    messageContentEditText.setTextKeepState(s);//请读者注意这一行，保持光标原先的位置，而 mEditText.setText(s)会让光标跑到最前面，                    //就算是再加mEditText.setSelection(nSelStart) 也不起作用                }                charLeftTextView.setText("剩余：" + (MAX_MESSAGE_CHAR_LENGTH - messageContentEditText.getText().length()));            }        });
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