权重：就是在布局界面中所占的比例
实践案例：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_height="match_parent" android:layout_width="match_parent" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:background="#f47920"> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:background="#2a5caa"> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:background="#faa755"> </LinearLayout> </LinearLayout>
