<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.tnnowu.android.qrcode.MainActivity"> <ImageView android:id="@+id/iv_qrcode" android:layout_width="220dp" android:layout_height="220dp" android:layout_centerInParent="true" android:layout_marginTop="40dp" android:background="#FFFFFF" /></RelativeLayout>
源代码已上传至Github，欢迎Star，Fork。THX
https://github.com/cnwutianhao/QRCode