Android让控件位于底部

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_alignParentBottom="true" android:background="#5291AF" android:layout_height="wrap_content" android:orientation="vertical"> <TextView android:id="@+id/textView2" android:layout_width="match_parent" android:layout_height="40sp" android:gravity="center" android:textSize="20sp" android:textColor="#FCFCFC" android:text="我在底部" /> </LinearLayout> </RelativeLayout> </LinearLayout> </LinearLayout>