Android RelativeLayout 布局android:layout_centerHorizontal="true"注意

<?xml version="1.0" encoding="utf-8"?>
<com.whoop.mobile.trace.view.BindDecodeItemLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" ><RelativeLayout
android:id="@+id/bind_decode_item_layout"
android:layout_width="180dp"
android:layout_height="220dp"
android:layout_centerInParent="true"
android:gravity="center" ><ImageView
android:id="@+id/bind_decode_item_layout_diagram"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@drawable/bind_decode_item" /><TextView
android:id="@+id/bind_decode_item_layout_qrcode"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="10dp"
android:ellipsize="end"
android:gravity="center_horizontal"
android:singleLine="true"
android:textColor="@color/black"
android:textSize="15sp" />
</RelativeLayout><ImageButton
android:id="@+id/bind_decode_item_layout_btnDelete"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginTop="-25dp"
android:layout_alignTop="@id/bind_decode_item_layout"
android:layout_centerHorizontal="true"
android:scaleType="centerCrop"
android:src="@drawable/activity_sale_duplicate_icon" /></com.whoop.mobile.trace.view.BindDecodeItemLayout>