Android EditText的设置错误提示信息

final EditText et = (EditText)findViewById(R.id.edit);

et.setInputType(InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS);//只能输入邮箱地址

if (et.getText().length() <= 0) {
et.setHint("请输入邮箱地址");
}

final Drawable dr = getResources().getDrawable(R.drawable.ic_launcher);

dr.setBounds(0, 0, 10, 10); //必须设置大小，否则不显示

et.addTextChangedListener(new TextWatcher() {

public void beforeTextChanged(CharSequence s, int start, int count, int after) {

}
public void onTextChanged(CharSequence s, int start, int before, int count) {

}
@Override
public void afterTextChanged(Editable arg0) {
// TODO Auto-generated method stub
if (et.getText().length() > 0) { //"[a-zA-Z0-9._-]+@[a-z]+.[a-z]+"

if (!et.getText().toString().matches("[a-zA-Z0-9._-]+@[a-z]+\\.+[a-z]+")) {
et.setError("请输入正确的邮箱地址", dr);
}
} else {
et.setHint("请输入邮箱地址");
}
}
});