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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