EditText限制输入类型

<EditText            android:id="@+id/et_agent_reg_pwd"            style="@style/mEditText"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:layout_marginLeft="@dimen/px50"            android:layout_marginRight="@dimen/px10"            android:layout_toLeftOf="@+id/iv_eyes"            android:gravity="center_vertical"            android:hint="@string/pwd_format_error"            android:maxLength="16"            android:paddingLeft="@dimen/px10"            android:digits="0123456789qwertyuioplkjhgfdsazxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"            android:password="true"            android:textSize="@dimen/sp_px28"/>