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<?xml version="1.0" encoding="utf-8"?><RelativeLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:layout_height="match_parent" tools:context="com.example.week1_02.MainActivity">    <RadioGroup        android:layout_width="match_parent"        android:layout_height="40dp"        android:layout_alignParentBottom="true"        android:orientation="horizontal"        android:id="@+id/rg">        <RadioButton            android:layout_weight="1"            android:id="@+id/rb0"            android:button="@null"            android:gravity="center"            android:text="首页"            android:checked="true"            android:background="@drawable/radiobutton_selector"            android:layout_width="wrap_content"            android:layout_height="wrap_content" />        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/radiobutton_selector"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:text="西瓜视屏"            android:id="@+id/rb1"/>        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/radiobutton_selector"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:text="微头条"            android:id="@+id/rb2"/>        <RadioButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:background="@drawable/radiobutton_selector"            android:layout_weight="1"            android:button="@null"            android:gravity="center"            android:text="我的"            android:id="@+id/rb3"/>    </RadioGroup>    <FrameLayout        android:id="@+id/fl"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_above="@+id/rg"></FrameLayout></RelativeLayout>

item_layout

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="horizontal"    android:padding="10dp"    android:layout_width="match_parent"    android:layout_height="match_parent">    <ImageView        android:id="@+id/image_view"        android:layout_width="100dp"        android:layout_height="100dp" />    <TextView        android:id="@+id/text_title"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></LinearLayout>
s_f1
<?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">    <ListView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/lv"></ListView></LinearLayout>

s_f2
<?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">    <ListView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/lv"></ListView></LinearLayout>

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