在開發應用的時候，經常會限制用戶輸入的字數，比如發表評論或者其它什么的，下面來個簡單的demo

EditText et_content;//定義一個文本輸入框
TextView tv_num;// 用來顯示剩余字數
int num = 10;//限制的最大字數

?

et_content = (EditText) findViewById(R.id.et_content);
tv_num = (TextView) findViewById(R.id.tv_num);
tv_num.setText("10");

下面為EditText文本框添加監聽

et_content.addTextChangedListener(new TextWatcher() {
??????????? private CharSequence temp;
??????????? private int selectionStart;
??????????? private int selectionEnd;

??????????? @Override
??????????? public void onTextChanged(CharSequence s, int start, int before,
??????????????????? int count) {
??????????????? temp = s;
??????????????? System.out.println("s="+s);
??????????? }

??????????? @Override
??????????? public void beforeTextChanged(CharSequence s, int start, int count,
??????????????????? int after) {
??????????? }

??????????? @Override
??????????? public void afterTextChanged(Editable s) {
??????????????? int number = num - s.length();
??????????????? tv_num.setText("" + number);
??????????????? selectionStart = et_content.getSelectionStart();
??????????????? selectionEnd = et_content.getSelectionEnd();
??????????????? //System.out.println("start="+selectionStart+",end="+selectionEnd);
??????????????? if (temp.length() > num) {
??????????????????? s.delete(selectionStart - 1, selectionEnd);
??????????????????? int tempSelection = selectionStart;
??????????????????? et_content.setText(s);
??????????????????? et_content.setSelection(tempSelection);//設置光標在最后
??????????????? }
??????????? }
??????? });

這樣就可以實現了

總結

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