限制EditText输入字符

<EditText        android:id="@+id/et_id"
        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:ellipsize="end"        android:hint="请输入身份证"        android:singleLine="true" />

EditText editText = (EditText) findViewById(R.id.limit_edittext);String digists = "0123456789xX";editText.setKeyListener(DigitsKeyListener.getInstance(digists));