private String JID,laststring;
private int lastcount;
EditText edt=(EditText)findViewById(R.id.edt);
edt.addTextChangedListener(watcher);
private TextWatcher watcher=new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
// TODO Auto-generated method stub
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
// 获取输入前的光标位置以及内容
laststring=edt.getText().toString();
lastcount=edt.getSelectionStart();
}
@Override
public void afterTextChanged(Editable s) {
// 获取输入后内容
String strorder=edt.getText().toString();
if (strorder.length()!=0&&laststring.length()<strorder.length()) {
//限制只输入汉字,字母以及数字的正则表达式
String regEx="^[\u4e00-\u9fa5a-zA-Z0-9]+$";
Pattern p = Pattern.compile(regEx);
//截取输入的字符串
String newinput=strorder.substring(lastcount,strorder.length()-laststring.length()+lastcount);
Matcher m = p.matcher(newinput);
if (!m.matches()) {
edt.setText(laststring);
edt.setSelection(edt.length());
System.out.println("只能输入汉字,字母以及数字");
}
}
}
};
可以编写不同的正则表达式来限制其他的输入内容!