在开发应用的时候，经常会限制用户输入的字数，比如发表评论或者其它什么的，下面来个简单的demo
EditText et_content;//定义一个文本输入框TextView tv_num;// 用来显示剩余字数int num = 10;//限制的最大字数
et_content = (EditText) findViewById(R.id.et_content);tv_num = (TextView) findViewById(R.id.tv_num); tv_num.setText("10");下面为EditText文本框添加监听
?
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);//设置光标在最后 } } });
这样就可以实现了