Android EditText聚焦时hint消失的简单代码

mInfo = (EditText) findViewById(R.id.fabu_info);
mInfo.setOnFocusChangeListener(new OnFocusChangeListener() {
    public void onFocusChange(View v, boolean hasFocus) {
        EditText _v=(EditText)v;
        if (!hasFocus) {// 失去焦点
            _v.setHint(_v.getTag().toString());
        } else {
            String hint=_v.getHint().toString();
            _v.setTag(hint);
            _v.setHint("");
        }
    }
});