android实现底部菜单栏

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/header_bg_color"
android:fitsSystemWindows="true"
android:orientation="vertical">

<FrameLayout
android:id="@+id/fl_content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />

<LinearLayout
android:id="@+id/ll_tab"
android:layout_width="match_parent"
android:layout_height="49dp"
android:background="@color/white"
android:orientation="vertical">

<View
android:layout_width="match_parent"
android:layout_height="0.2dp"
android:background="@color/text_light" />

<RadioGroup
android:id="@+id/radio_group"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="bottom"
android:background="@color/fifty_percent_transparent_white"
android:orientation="horizontal">

<RadioButton
android:id="@+id/rb_home"
style="@style/radio_button"
android:drawableTop="@drawable/radio_button_img_home"
android:text="@string/radio_button_home" />

<RadioButton
android:id="@+id/rb_im"
style="@style/radio_button"
android:drawableTop="@drawable/radio_button_img_im"
android:text="@string/im" />

<RadioButton
android:id="@+id/rb_fruit"
style="@style/radio_button"
android:drawableTop="@drawable/icon_fruits"
android:text="@string/radio_button_fruit" />

<RadioButton
android:id="@+id/rb_me"
style="@style/radio_button"
android:drawableTop="@drawable/radio_button_img_me"
android:text="@string/radio_button_me" />
</RadioGroup>
</LinearLayout>
</LinearLayout>