RealativeLayout
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <EditText android:id="@+id/et_relative_msg" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentRight="true" android:hint="Message"> </EditText> <Button android:id="@+id/btn_relative_ok" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="OK" android:layout_below="@id/et_relative_msg" android:layout_alignRight="@id/et_relative_msg" android:layout_marginLeft="10dp"/> <Button android:id="@+id/btn_relative_cancel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Cancel" android:layout_alignTop="@id/btn_relative_ok" android:layout_toLeftOf="@id/btn_relative_ok"/> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="相对父亲居中" /> </RelativeLayout>
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