Android editText 输入字数限制

最新推荐文章于 2024-10-24 16:42:33 发布

iteye_1261

最新推荐文章于 2024-10-24 16:42:33 发布

阅读量65

点赞数

文章标签：移动开发

本文介绍两种限制Android中EditText输入字数的方法。一种是通过监听输入变化并进行判断删除，另一种是自定义长度过滤器实现输入限制，并提供自定义提示。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

方法一：

// 输入框限制输入字数 editText.addTextChangedListener(new TextWatcher() { private CharSequence temp; private boolean isEdit = true; private int selectionStart ; private int selectionEnd ; @Override public void beforeTextChanged(CharSequence s, int arg1, int arg2, int arg3) { temp = s; } @Override public void onTextChanged(CharSequence s, int arg1, int arg2, int arg3) { } @Override public void afterTextChanged(Editable s) { selectionStart = editText.getSelectionStart(); selectionEnd = editText.getSelectionEnd(); Log.i("gongbiao1",""+selectionStart); if (temp.length() > Constant.TEXT_MAX) { Toast.makeText(KaguHomeActivity.this, R.string.edit_content_limit, Toast.LENGTH_SHORT) .show(); s.delete(selectionStart-1, selectionEnd); int tempSelection = selectionStart; editText.setText(s); editText.setSelection(tempSelection); } } });

方法二：
利用EditText 可以设置filter的特性，自定义一个LengthFilter，当输入字数超过限制时，做出自定义的提示

// 输入框限制输入字数 InputFilter[] filters = new InputFilter[1]; filters[0] = new InputFilter.LengthFilter(Constant.TEXT_MAX) { @Override public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { if (source.length() > 0 && dest.length() == Constant.TEXT_MAX) { if ((System.currentTimeMillis() - toastTime) > interval) { toastTime = System.currentTimeMillis(); Toast .makeText(KaguHomeActivity.this, R.string.edit_content_limit, Toast.LENGTH_SHORT).show(); } } if (dest.toString().equals( getResources().getString(R.string.input_default_txt))) { Bundle data = new Bundle(); data.putCharSequence("source", source); Message message = textHandler.obtainMessage(); message.setData(data); message.sendToTarget(); } return super.filter(source, start, end, dest, dstart, dend); } }; editText.setFilters(filters); private Handler textHandler = new Handler() { @Override public void handleMessage(Message msg) { Bundle data = msg.getData(); CharSequence source = data.getCharSequence("source"); editText.setTextColor(Color.BLACK); editText.setText(source); editText.setSelection(source.length()); } };